A. Demant 152-232 "Chapter 33. Mineral chemistry of volcanic sequences from Hole 917A, southeast Greenland Margin" " Leg 152, East Greenland Margin" Microprobe analyses of olivines "Leg 152, Hole 917A, core 20R4, 122-127 cm - Picrite - Unit 32B " 14 15 16 17 18 19 20 22 23 24 26 27 28 29 30 SiO2 39.44 39.23 38.94 39.66 39.47 39.79 38.4 39.09 39.39 37.51 39.21 39.46 38.28 38.12 37.91 Al2O3 0.13 0.05 0.09 0.08 0.08 0.1 0.07 0.07 0.05 0.04 0.07 0.07 0.03 0.04 0.01 FeOt 8.26 7.98 12.16 9.06 9.68 7.45 15.12 10.05 12.09 20.63 10.65 7.48 14.1 15.57 16.23 MnO 0.11 0.17 0.13 0.13 0.16 0.13 0.22 0.17 0.17 0.37 0.17 0.08 0.2 0.24 0.24 MgO 50.98 50.45 47.24 49.57 48.99 50.79 44.83 48.93 47.35 39.89 47.71 51.52 45.66 44.47 44.28 CaO 0.24 0.22 0.23 0.22 0.25 0.23 0.22 0.23 0.25 0.26 0.23 0.25 0.3 0.31 0.3 Cr2O3 0.17 0.16 0.1 0.1 0.11 0.12 0.17 0.01 0.03 0.09 NiO 0.4 0.45 0.32 0.46 0.56 0.45 0.35 0.28 0.2 0.4 Total 99.74 98.7 99.22 99.27 99.29 99.05 99.39 98.53 99.6 98.93 98.52 98.86 98.57 98.75 98.97 Structural formulae calculated with 4 oxygens Si 0.968 0.973 0.977 0.981 0.979 0.979 0.976 0.977 0.983 0.983 0.984 0.972 0.976 0.976 0.973 Al 0.004 0.002 0.003 0.002 0.002 0.003 0.002 0.002 0.001 0.001 0.002 0.002 0.001 0.001 0 Fet 0.17 0.165 0.255 0.187 0.201 0.153 0.321 0.21 0.252 0.452 0.224 0.154 0.3 0.334 0.348 Mn 0.002 0.004 0.003 0.003 0.003 0.003 0.005 0.004 0.004 0.008 0.004 0.002 0.004 0.005 0.005 Mg 1.866 1.864 1.767 1.827 1.812 1.863 1.699 1.823 1.762 1.559 1.784 1.891 1.734 1.698 1.693 Ca 0.006 0.006 0.006 0.006 0.007 0.006 0.006 0.006 0.007 0.007 0.006 0.007 0.008 0.008 0.008 Cr 0.003 0.003 0.002 0.002 0.002 0.002 0.003 0 0.001 0.002 Ni 0.008 0.009 0.006 0.009 0.011 0.009 0.007 0.006 0.004 0.008 Sum 3.028 3.025 3.02 3.017 3.018 3.018 3.02 3.022 3.015 3.016 3.013 3.027 3.024 3.023 3.027 Fo 91.66 91.85 87.38 90.7 90.02 92.4 84.09 89.67 87.47 77.51 88.87 92.47 85.24 83.58 82.95 Fa 8.34 8.15 12.62 9.3 9.98 7.6 15.91 10.33 12.53 22.49 11.13 7.53 14.76 16.42 17.05 "Leg 152, Hole 917A, core 55R4, 98-101 cm - Olivine-plagioclase-pyroxene-phyric basalt - Unit 60 " 52 53 54 55 103 104 105 106 107 108 109 110 111 112 113 114 SiO2 39.3 38.66 38.44 37.76 38.63 38.43 38.42 38.35 38.76 39.09 37.99 38.65 38.34 37.77 38.52 38.31 Al2O3 0.02 0.03 0.03 0.04 0.02 0.01 0.03 0.09 0.02 0.05 0.02 0.02 0.01 0.03 0.03 FeOt 16.05 17.09 17.97 22.16 17.23 17.14 18 18.67 16.14 15.65 21.28 16.16 18 22.68 18.74 18.08 MnO 0.24 0.32 0.3 0.34 0.23 0.24 0.26 0.26 0.26 0.25 0.31 0.24 0.27 0.32 0.31 0.26 MgO 44.13 43.24 42.5 39.2 42.91 43.09 42.4 41.46 43.84 43.57 39.28 43.73 42.5 38.42 41.63 42.23 CaO 0.34 0.35 0.33 0.35 0.33 0.32 0.36 0.33 0.32 0.36 0.33 0.35 0.32 0.33 0.33 0.34 Cr2O3 NiO Total 100.07 99.69 99.58 99.84 99.34 99.23 99.43 99.09 99.4 98.93 99.24 99.15 99.46 99.52 99.56 99.25 Structural formulae calculated with 4 oxygens Si 0.992 0.986 0.986 0.986 0.989 0.985 0.987 0.991 0.987 0.997 0.993 0.987 0.985 0.991 0.991 0.987 Al 0 0.001 0.001 0.001 0.001 0 0.001 0.003 0.001 0.002 0.001 0.001 0 0.001 0.001 Fet 0.339 0.365 0.386 0.484 0.369 0.368 0.387 0.404 0.344 0.334 0.465 0.345 0.387 0.498 0.403 0.389 Mn 0.005 0.007 0.007 0.008 0.005 0.005 0.006 0.006 0.006 0.005 0.007 0.005 0.006 0.007 0.007 0.006 Mg 1.661 1.644 1.625 1.525 1.638 1.647 1.624 1.597 1.664 1.656 1.531 1.665 1.627 1.503 1.597 1.621 Ca 0.009 0.01 0.009 0.01 0.009 0.009 0.01 0.009 0.009 0.01 0.009 0.009 0.009 0.009 0.009 0.009 Cr Ni Sum 3.007 3.013 3.013 3.014 3.01 3.014 3.013 3.008 3.012 3.003 3.006 3.013 3.015 3.009 3.008 3.013 Fo 83.05 81.85 80.82 75.92 81.62 81.75 80.76 79.83 82.88 83.22 76.69 82.83 80.8 75.12 79.84 80.63 Fa 16.95 18.15 19.18 24.08 18.38 18.25 19.24 20.17 17.12 16.78 23.31 17.17 19.2 24.88 20.16 19.37 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 119 120 121 128 182 184 185 186 218 219 225 262 SiO2 41.09 40.48 39.98 40.24 40.04 40.16 39.72 39.65 40.41 39.53 40 39.73 Al2O3 0.09 0.04 0.08 0.09 0.06 0.08 0.01 0.05 0.03 0 0.03 0.03 FeOt 9.2 11.03 14.27 12.85 8.95 8.95 11.11 12.96 10.7 13.95 14.23 13.14 MnO 0.12 0.13 0.18 0.22 0.04 0.1 0.15 0.22 0.14 0.25 0.2 0.19 MgO 49.03 47.17 44.95 45.41 48.72 48.45 47.49 45.11 46.74 44.44 44.54 44.69 CaO 0.29 0.3 0.29 0.3 0.33 0.34 0.32 0.29 0.3 0.36 0.35 0.29 Cr2O3 NiO 0.33 0.31 0.2 0.29 0.31 0.25 0.22 0.23 Total 100.15 99.46 99.95 99.39 98.14 98.39 99.04 98.49 98.31 98.53 99.34 98.3 Structural formulae calculated with 4 oxygens Si 1.003 1.004 1.001 1.007 0.992 0.999 0.992 1.003 1.006 0.998 1.002 1.007 Al 0.002 0.001 0.002 0.003 0.002 0.002 0 0.001 0.001 0 0.001 0.001 Fet 0.188 0.229 0.299 0.269 0.185 0.186 0.232 0.274 0.223 0.295 0.298 0.279 Mn 0.003 0.003 0.004 0.005 0.001 0.002 0.003 0.005 0.003 0.005 0.004 0.004 Mg 1.784 1.744 1.678 1.693 1.799 1.796 1.768 1.701 1.734 1.673 1.663 1.689 Ca 0.008 0.008 0.008 0.008 0.009 0.009 0.009 0.008 0.008 0.01 0.009 0.008 Cr Ni 0.006 0.006 0.004 0.006 0.02 0.006 0.005 0.004 0.02 0.02 0.02 0.005 Sum 2.995 2.995 2.997 2.992 3.007 3 3.008 2.996 2.994 3.002 2.998 2.992 Fo 90.48 88.4 84.88 86.3 90.66 90.61 88.4 86.12 88.62 85.03 84.8 85.84 Fa 9.52 11.6 15.12 13.7 9.34 9.39 11.6 13.88 11.38 14.97 15.2 14.16 "Leg 152, Hole 917A, core 72R-1, 82-85 cm - Olivine-phyric basalt - Unit 73A " 1 2 47 48 51 52 53 62 SiO2 38.94 39.17 39.06 39.31 39.07 38.61 38.47 38.91 Al2O3 0.03 0.07 0.07 0.04 0.03 0.04 0.05 FeO 16.83 15.03 11.99 12.23 14.07 14.46 16.07 14.82 MnO 0.21 0.23 0.22 0.15 0.21 0.22 0.25 0.22 MgO 42.86 45.09 46.72 46.57 45.32 45.26 44.15 44.85 CaO 0.36 0.35 0.31 0.31 0.3 0.33 0.33 0.31 Cr2O3 0.05 NiO2 0.55 Total 99.19 99.89 98.96 98.63 99 98.91 99.29 99.16 Structural formulae calculated with 4 oxygens Si 0.996 0.987 0.983 0.99 0.989 0.981 0.981 0.987 Al 0.001 0.002 0.002 0.001 0.001 0.001 0.002 Fet 0.36 0.317 0.252 0.258 0.298 0.307 0.343 0.314 Mn 0.004 0.005 0.005 0.003 0.004 0.005 0.005 0.005 Mg 1.634 1.694 1.753 1.748 1.71 1.715 1.679 1.696 Ca 0.01 0.009 0.008 0.008 0.008 0.009 0.009 0.009 Cr 0.001 Ni 0.011 Sum 3.004 3.013 3.015 3.009 3.011 3.018 3.018 3.012 Fo 81.95 84.24 87.41 87.16 85.17 84.8 83.04 84.36 Fa 18.05 15.76 12.59 12.84 14.83 15.2 16.96 15.64 "Leg 152, Hole 917A, core 88R-7, 83-86 cm - Aphyric olivine basalt - Unit 84" 10 32 33 49 50 51 52 56 319 320 321 322 323 324 325 SiO2 35.75 36.26 35.47 35.82 35.68 35.85 35.63 35.82 36.59 36.01 36.04 36.81 36.9 36.56 36.01 Al2O3 0.01 0.02 0.03 0.01 0.01 0.02 0.02 0.04 FeOt 33.24 33.52 33.1 33.69 33.17 33.09 33.07 32.65 31.56 34.69 34.46 30.25 30.59 31.94 32.86 MnO 0.36 0.46 0.5 0.37 0.5 0.42 0.5 0.46 0.55 0.48 0.59 0.5 0.44 0.55 0.48 MgO 29.89 29.71 30.52 29.68 29.67 29.67 29.53 29.98 30.59 28.99 28.81 32.38 32.48 30.94 30.24 CaO 0.19 0.19 0.21 0.19 0.18 0.23 0.23 0.22 0.26 0.21 0.24 0.23 0.22 0.24 0.23 Cr2O3 NiO2 Total 99.44 100.13 99.8 99.74 99.22 99.29 98.96 99.13 99.56 100.39 100.14 100.17 100.65 100.26 99.85 Structural formulae calculated with 4 oxygens Si 0.991 0.997 0.98 0.991 0.991 0.994 0.992 0.993 1.003 0.994 0.997 0.996 0.994 0.997 0.991 Al 0.001 0.001 0.001 0.001 0.001 Fet 0.77 0.771 0.765 0.78 0.771 0.767 0.77 0.757 0.723 0.801 0.797 0.684 0.689 0.728 0.757 Mn 0.008 0.011 0.012 0.009 0.012 0.01 0.012 0.011 0.013 0.011 0.014 0.011 0.01 0.013 0.011 Mg 1.234 1.218 1.257 1.224 1.229 1.226 1.226 1.239 1.25 1.193 1.188 1.305 1.305 1.257 1.241 Ca 0.006 0.006 0.006 0.006 0.005 0.007 0.007 0.007 0.008 0.006 0.007 0.007 0.006 0.007 0.007 Cr Ni Sum 3.009 3.003 3.02 3.009 3.008 3.006 3.007 3.007 2.997 3.006 3.003 3.004 3.005 3.003 3.008 Fo 61.58 61.23 62.17 61.09 61.45 61.51 61.41 62.07 63.34 59.83 59.84 65.61 65.42 63.32 62.12 Fa 38.42 38.77 37.83 38.91 38.55 38.49 38.59 37.93 36.66 40.17 40.16 34.39 34.58 36.68 37.88 "Leg 152, Hole 917A, core 94R-1, 71-74 cm - Aphyric olivine basalt - Unit 87" 111 112 114 115 117 118 119 120 121 122 123 135 SiO2 36.39 36.59 36.33 36.08 37.31 37.33 37.44 37.2 37.58 35.97 36.26 36.64 Al2O3 0 0 0 0 0.02 0.02 0.03 0.02 0.02 0.03 0 0.02 FeOt 32.29 30.86 31.54 32.23 26.02 25.79 25.97 27.42 24.88 32.2 30.7 29.61 MnO 0.62 0.41 0.51 0.37 0.42 0.41 0.43 0.37 0.41 0.47 0.44 0.36 MgO 30.89 32.09 31.56 31.03 36 36.28 35.99 34.83 36.71 30.96 31.04 33.01 CaO 0.3 0.26 0.31 0.28 0.31 0.29 0.33 0.29 0.34 0.27 0.25 0.34 Cr2O3 NiO2 Total 100.48 100.2 100.26 99.98 100.08 100.11 100.18 100.12 99.94 99.91 98.69 99.98 Structural formulae calculated with 4 oxygens Si 0.992 0.993 0.99 0.989 0.99 0.989 0.992 0.993 0.993 0.987 1 0.991 Al 0 0 0 0 0.001 0.001 0.001 0.001 0 0.001 0 0.001 Fet 0.736 0.7 0.719 0.739 0.577 0.571 0.575 0.612 0.55 0.739 0.708 0.669 Mn 0.014 0.009 0.012 0.008 0.009 0.009 0.01 0.008 0.009 0.011 0.01 0.008 Mg 1.256 1.298 1.281 1.267 1.424 1.432 1.421 1.385 1.445 1.266 1.275 1.33 Ca 0.009 0.007 0.009 0.008 0.009 0.008 0.009 0.008 0.01 0.008 0.007 0.01 Cr Ni Sum 3.008 3.007 3.01 3.011 3.01 3.011 3.008 3.007 3.007 3.012 3 3.009 Fo 63.03 64.95 64.07 63.18 71.14 71.49 71.18 69.36 72.45 63.15 64.31 66.52 Fa 36.97 35.05 35.93 36.82 28.86 28.51 28.82 30.64 27.55 36.85 35.69 33.48 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 202 204 205 206 207 213 214 245 246 265 267 269 273 326 331 332 333 335 SiO2 36.95 36.36 36.63 37.24 37.67 36.49 38.42 37.96 37.78 36.23 36.98 37.36 36.89 36.31 37.68 37.66 37.08 37.59 Al2O3 0.02 0.13 0.02 0.21 0.02 0.03 0 0.02 0.01 0.02 0.02 0.05 0.01 0 0 0 0.05 0.02 FeO 25.39 29.63 27.23 24.15 22.47 29.17 19.36 22.92 23.52 30.7 26.71 24.27 26.84 30.23 23.38 23.94 26.66 23.83 MnO 0.29 0.6 0.45 0.35 0.45 0.4 0.27 0.32 0.23 0.45 0.44 0.32 0.38 0.59 0.33 0.34 0.42 0.31 MgO 35.76 32.44 34.36 36.85 37.64 32.64 40.28 37.51 37.21 31.25 34.82 36.56 34.49 30.98 37.04 36.96 34.27 36.53 CaO 0.3 0.28 0.3 0.36 0.31 0.26 0.26 0.33 0.28 0.25 0.31 0.32 0.3 0.32 0.32 0.32 0.3 0.3 Cr2O3 NiO2 Total 98.72 99.44 98.98 99.15 98.56 98.98 98.59 99.05 99.02 98.9 99.28 98.88 98.9 98.43 98.76 99.21 98.77 98.58 Structural formulae calculated with 4 oxygens Si 0.992 0.99 0.99 0.989 0.998 0.995 1.001 1.001 0.999 0.997 0.993 0.995 0.995 1.002 1 0.997 1 1.001 Al 0.001 0.004 0.001 0.006 0.001 0.001 0 0.001 0 0 0.001 0.002 0 0 0 0 0.002 0.001 Fet 0.57 0.675 0.616 0.536 0.498 0.665 0.422 0.506 0.52 0.706 0.6 0.541 0.606 0.698 0.519 0.53 0.601 0.531 Mn 0.006 0.014 0.01 0.008 0.01 0.009 0.006 0.007 0.005 0.011 0.01 0.007 0.009 0.014 0.007 0.008 0.01 0.007 Mg 1.431 1.317 1.384 1.458 1.486 1.327 1.564 1.475 1.467 1.281 1.394 1.451 1.387 1.275 1.465 1.459 1.378 1.45 Ca 0.009 0.008 0.009 0.01 0.009 0.008 0.007 0.009 0.008 0.007 0.009 0.009 0.009 0.009 0.009 0.009 0.009 0.009 Cr Ni Sum 3.008 3.008 3.01 3.008 3.002 3.004 2.999 2.998 3 3.003 3.006 3.004 3.005 2.998 3 3.003 2.999 2.998 Fo 71.51 66.11 69.22 73.11 74.91 66.61 78.76 74.47 73.82 64.47 69.92 72.86 69.61 64.62 73.84 73.34 69.61 73.21 Fa 28.49 33.89 30.78 26.89 25.09 33.39 21.24 25.53 26.18 35.53 30.08 27.14 30.39 35.38 26.16 26.66 30.39 26.79 A. Demant "Leg 152, East Greenland margin" Microprobe analyses of chromites "Leg 152, Hole 917A, core 13R2, 70-75 cm - Picrite - Unit 16" 49 50 51 52 SiO2 0.36 0.41 0.42 0.55 Al2O3 25.2 25.08 25.39 23.88 FeO 21.48 21.55 17.08 16.45 Fe2O3 5.84 5.67 5.87 4.34 MnO 0.36 0.28 0.3 0.42 MgO 8.9 8.9 11.6 11.86 TiO2 0.48 0.49 0.45 0.53 Cr2O3 34.82 35.09 35.35 38.7 Total 97.43 97.46 96.46 96.72 Structural formulae calculated with 32 oxygens Si 0.091 0.105 0.106 0.139 Al 7.574 7.54 7.553 7.109 Fe2 4.582 4.597 3.605 3.476 Fe3 1.121 1.089 1.115 0.825 Mn 0.077 0.06 0.065 0.09 Mg 3.383 3.384 4.363 4.464 Ti 0.092 0.094 0.085 0.1 Cr 7.023 7.078 7.055 7.728 Sum 23.968 23.947 23.947 23.931 "Leg 152, Hole 917A, core 18R3, 98-101 cm - Picrite - Unit 25" 141 146 155 159 SiO2 0.39 0.24 0.41 0.34 Al2O3 24.33 23.78 28.8 19.81 FeO 22.89 22.7 15.55 21.14 Fe2O3 9.58 9.68 11.67 10.19 MnO 0.2 0.15 0.17 0.29 MgO 9.25 8.67 13.64 9.35 TiO2 2.27 0.85 0.66 1.19 Cr2O3 29.68 33.13 28.12 36.83 Total 98.59 99.19 99.02 99.14 Structural formulae calculated with 32 oxygens Si 0.098 0.06 0.098 0.086 Al 7.266 7.119 8.185 6.001 Fe2+ 4.848 4.82 3.135 4.542 Fe3+ 1.824 1.848 2.116 1.969 Mn 0.042 0.032 0.035 0.063 Mg 3.494 3.279 4.902 3.583 Ti 0.433 0.162 0.12 0.231 Cr 5.945 6.65 5.361 7.483 Sum 23.951 23.97 23.951 23.957 "Leg 152, Hole 917A, core 20R4, 122-127 cm - Picrite - Unit 32B " 306 307 308 309 310 SiO2 0.43 0.4 0.42 0.41 0.39 Al2O3 20.58 19.17 19.15 17.8 20.64 FeO 11.65 18.99 11.46 13.05 9.58 Fe2O3 4.76 5.25 6.57 7.79 5.28 MnO 0.17 0.24 0.17 0.15 0.19 MgO 15.25 10.18 15.14 14.08 16.5 TiO2 0.45 0.45 0.49 0.59 0.45 Cr2O3 45.57 43.8 45.05 44.82 45.4 Total 98.85 98.48 98.46 98.68 98.43 Structural formulae calculated with 32 oxygenes Si 0.107 0.104 0.105 0.102 0.096 Al 5.972 5.808 5.616 5.279 5.964 Fe2 2.398 4.083 2.386 2.747 1.965 Fe3 0.882 1.015 1.231 1.476 0.975 Mn 0.035 0.052 0.036 0.032 0.039 Mg 5.597 3.899 5.617 5.281 6.03 Ti 0.084 0.086 0.092 0.111 0.082 Cr 8.873 8.901 8.865 8.92 8.801 Sum 23.947 23.948 23.948 23.949 23.952 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 135 255 256 257 258 259 260 261 SiO2 0.92 0.86 0.9 0.99 0.97 1.18 1.16 1.16 Al2O3 25.21 24.13 27.32 14.96 17.97 20.63 19.56 19 FeO 15.41 19.22 19.45 22.78 24.33 18.95 22.12 29.02 Fe2O3 8.47 8.06 6.23 17.1 14.01 10.16 10.39 9.42 MnO 0.18 0.24 0.26 0.15 0.3 0.19 0.26 0.42 MgO 13.49 10.94 11.14 9.15 8.08 11.06 8.91 4.24 TiO2 1 1.12 1.28 4 3.59 1.87 1.87 2.04 Cr2O3 34.38 34.54 32.19 29.24 28.79 34.68 34.79 33.22 Total 99.05 99.1 98.75 98.38 98.03 98.73 99.06 98.5 Structural formulae calculated with 32 oxygenes Si 0.225 0.214 0.22 0.262 0.255 0.299 0.297 0.31 Al 7.235 7.07 7.908 4.653 5.567 6.139 5.916 5.973 Fe2 3.138 3.996 3.995 5.027 5.351 4.001 4.748 6.474 Fe3 1.553 1.509 1.151 3.397 2.773 1.93 2.007 1.891 Mn 0.037 0.05 0.054 0.034 0.066 0.041 0.057 0.094 Mg 4.896 4.056 4.077 3.601 3.165 4.163 3.406 1.685 Ti 0.184 0.208 0.236 0.793 0.71 0.354 0.361 0.409 Cr 6.62 6.791 6.25 6.102 5.985 6.923 7.058 7.008 Sum 23.887 23.893 23.89 23.869 23.872 23.851 23.851 23.845 "Leg 152, Hole 917A, core 72R-1, 82-85 cm - Olivine-phyric basalt - Unit 73A " 54 196 197 211 212 SiO2 0.3 0.43 0.45 0.49 0.39 Al2O3 21.37 20.3 20.79 21.77 21.54 FeO 20.3 20.58 18.71 14.91 20.32 Fe2O3 10.92 11.71 8.9 11.24 10.35 MnO 0.24 0.38 0.29 0.2 0.3 MgO 9.75 9.69 10.42 13.07 9.56 TiO2 0.74 1.97 0.85 1.01 1.06 Cr2O3 35.17 31.96 36.8 34.27 33.69 Total 98.79 97.03 97.22 96.97 97.2 Structural formulae calculated with 32 oxygenes Si 0.076 0.113 0.116 0.124 0.101 Al 6.435 6.234 6.32 6.494 6.573 Fe2 4.339 4.483 4.037 3.156 4.4 Fe3 2.099 2.296 1.728 2.14 2.018 Mn 0.051 0.083 0.064 0.043 0.065 Mg 3.715 3.764 4.006 4.931 3.69 Ti 0.143 0.387 0.165 0.193 0.206 Cr 7.105 6.584 7.506 6.857 6.896 Sum 23.962 23.944 23.942 23.938 23.949 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 201 270 274 260 261 SiO2 0.41 0.27 0.25 0.31 0.34 Al2O3 3.82 11.91 8.2 9.59 9.18 FeO 30.36 28.25 30.91 28.72 28.77 Fe2O3 31.87 21.33 22.55 20.71 23.99 MnO 0.35 0.37 0.37 0.37 0.41 MgO 2.98 3.4 2.17 2.97 3.38 TiO2 5.18 1.81 3.8 2.44 3.07 Cr2O3 20.49 28.47 26.25 29.46 26.3 Total 95.46 95.81 94.5 94.58 95.43 Structural formulae calculated with 32 oxygenes Si 0.124 0.076 0.076 0.093 0.1 Al 1.363 4.041 2.898 3.338 3.167 Fe2+ 7.683 6.801 7.753 7.095 7.046 Fe3+ 7.255 4.621 5.088 4.604 5.288 Mn 0.089 0.09 0.095 0.093 0.102 Mg 1.344 1.46 0.971 1.308 1.475 Ti 1.179 0.391 0.857 0.543 0.676 Cr 4.901 6.48 6.224 6.88 6.09 Sum 23.938 23.962 23.962 23.953 23.944 A. Demant "Leg 152, East Greenland margin" Microprobe analyses of plagioclases "Leg 152, Hole 917A, core 8R-4, 15-20 cm - Aphyric olivine basalt - Unit 6" 267 272 287 14 19 SiO2 55.33 53.2 53.62 51.49 51.97 Al2O3 26.86 28.37 28.57 29.72 28.58 FeO 0.89 0.96 0.86 0.79 1.12 MgO 0.01 0.1 0.13 0.14 0.25 CaO 10.56 12.05 12.23 13.64 13.27 Na2O 5.59 4.69 4.75 3.31 3.45 K2O 0.11 0.09 0.06 0.05 0.06 Total 99.35 99.46 100.22 99.13 98.69 Structural Formulae calculated with 8 oxygens Si 2.519 2.432 2.432 2.364 2.398 Al 1.441 1.528 1.527 1.608 1.554 Fet 0.034 0.037 0.033 0.03 0.043 Mg 0.001 0.007 0.009 0.009 0.017 Ca 0.515 0.59 0.594 0.671 0.656 Na 0.494 0.416 0.418 0.295 0.308 K 0.006 0.005 0.003 0.003 0.003 sum 5.01 5.015 5.015 4.981 4.981 An 50.73 58.36 58.51 69.26 67.79 Ab 48.64 41.12 41.16 30.44 31.86 Or 0.63 0.52 0.32 0.3 0.35 "Leg 152, Hole 917A, core 10R-1, 58-61 cm - Aphyric olivine basalt - Unit 9" 151 152 153 154 155 165 167 168 169 170 171 SiO2 52 59.53 53.04 49.92 50.64 52.02 57.47 49.56 51.35 51.21 50.17 Al2O3 29.8 25.39 29.45 31.97 31.18 30.47 26.66 31.2 29.95 30.24 30.65 FeO 0.97 0.97 1.02 0.76 0.81 0.98 0.86 0.84 1.18 0.91 0.84 MgO 0.12 0.07 0.16 0.19 0.23 0.14 0.05 0.16 0.5 0.16 0.22 CaO 13.59 7.89 13.27 15.45 14.92 13.89 9.41 15.16 13.56 13.85 15.04 Na2O 3.84 7.3 3.97 3.02 3.21 3.91 6.31 3 3.82 3.91 3.35 K2O 0.04 0.17 0.03 0.01 0.03 0.04 0.12 0.01 0.05 0.02 0.02 Total 100.35 101.31 100.93 101.32 101.02 101.44 100.88 99.94 100.41 100.29 100.28 Structural Formulae calculated with 8 oxygens Si 2.364 2.639 2.393 2.259 2.295 2.343 2.566 2.274 2.339 2.334 2.295 Al 1.597 1.326 1.566 1.705 1.665 1.617 1.403 1.687 1.608 1.624 1.652 Fet 0.037 0.036 0.038 0.029 0.031 0.037 0.032 0.032 0.045 0.035 0.032 Mg 0.008 0.005 0.01 0.013 0.015 0.01 0.003 0.011 0.034 0.011 0.015 Ca 0.662 0.375 0.641 0.749 0.724 0.67 0.45 0.745 0.662 0.677 0.737 Na 0.339 0.627 0.347 0.265 0.282 0.342 0.547 0.267 0.337 0.346 0.297 K 0.002 0.009 0.002 0.001 0.002 0.002 0.007 0.001 0.003 0.001 0.001 Sum 5.008 5.017 4.998 5.021 5.014 5.02 5.009 5.017 5.027 5.027 5.029 An 66 37.04 64.76 73.8 71.85 66.1 44.86 73.59 66.06 66.11 71.18 Ab 33.77 62.03 35.05 26.12 27.96 33.7 54.45 26.33 33.67 33.77 28.7 Or 0.23 0.93 0.2 0.08 0.19 0.2 0.69 0.08 0.27 0.11 0.12 "Leg 152, Hole 917A, core 11R-4, 41-44 cm - Aphyric olivine basalt - Unit 13" 194 195 196 197 198 199 200 202 203 241 249 250 SiO2 51.53 48.96 59.36 53.53 49.55 53.17 53.66 50 55.98 51.78 57.98 58.02 Al2O3 29.04 30.68 24.02 27.98 30.24 28.16 27.33 30.12 26.27 29.12 24.73 25.24 FeO 0.98 0.68 0.77 0.91 0.76 1.02 1.06 0.71 1.08 0.93 0.9 0.88 MgO 0.16 0.17 0.04 0.08 0.19 0.07 0.08 0.15 0.07 0.11 0.06 CaO 13.53 15.34 7.16 12.21 15 12.25 11.63 14.89 10.02 12.86 8.15 8.92 Na2O 3.73 2.68 7.23 4.45 2.94 4.5 4.83 2.94 5.96 4.12 6.66 6.34 K2O 0.01 0.02 0.17 0.06 0 0.08 0.07 0.02 0.11 0.04 0.14 0.12 Total 98.98 98.53 98.74 99.21 98.69 99.25 98.65 98.84 99.47 98.96 98.56 99.57 Structural formulae calculated with 8 oxygens Si 2.375 2.277 2.688 2.449 2.299 2.436 2.47 2.314 2.545 2.384 2.64 2.619 Al 1.577 1.681 1.282 1.509 1.654 1.521 1.482 1.642 1.407 1.58 1.327 1.342 Fet 0.038 0.027 0.029 0.035 0.03 0.039 0.041 0.028 0.041 0.036 0.034 0.033 Mg 0.011 0.012 0.003 0.005 0.013 0.005 0.005 0.01 0.005 0.008 0.004 Ca 0.668 0.764 0.348 0.599 0.746 0.601 0.573 0.738 0.488 0.634 0.397 0.432 Na 0.334 0.241 0.635 0.395 0.265 0.4 0.431 0.264 0.525 0.368 0.588 0.554 K 0.001 0.001 0.01 0.003 0 0.005 0.004 0.001 0.006 0.002 0.008 0.007 Sum 5.004 5.004 4.993 4.995 5.006 5.006 5.007 4.998 5.017 5.012 4.995 4.991 An 66.66 75.9 35.03 60.07 73.79 59.8 56.84 73.57 47.87 63.15 39.99 43.47 Ab 33.27 23.98 64.01 39.6 26.19 39.74 42.77 26.3 51.52 36.64 59.18 55.85 Or 0.06 0.12 0.96 0.33 0.02 0.46 0.39 0.13 0.6 0.21 0.84 0.67 "Leg 152, Hole 917A, core 18R3, 98-101 cm - Picrite - Unit 25" 112 113 116 148 149 150 163 165 SiO2 56.87 56.34 58.13 58.32 60.5 55.13 57.54 53.1 Al2O3 25.73 26.51 24.99 25.43 23.53 27.16 25.58 28.52 FeO 0.72 0.8 0.66 0.77 0.73 0.73 0.73 1 MgO 0.16 0.05 0.05 0.06 0.03 0.06 0.05 0.12 CaO 9.45 9.88 7.78 8.35 6.21 11 8.19 12.45 Na2O 6.05 5.63 6.63 6.41 7.39 5.04 6.59 4.18 K2O 0.22 0.23 0.32 0.26 0.43 0.12 0.29 0.09 Total 99.2 99.44 98.56 99.59 98.81 99.24 98.96 99.44 Structural formulae calculated with 8 oxygens Si 2.582 2.554 2.642 2.626 2.729 2.51 2.611 2.426 Al 1.377 1.416 1.338 1.35 1.251 1.457 1.368 1.536 Fet 0.027 0.03 0.025 0.029 0.027 0.028 0.028 0.038 Mg 0.011 0.003 0.004 0.004 0.002 0.004 0.003 0.008 Ca 0.46 0.48 0.379 0.403 0.3 0.536 0.398 0.609 Na 0.533 0.495 0.584 0.559 0.646 0.445 0.58 0.37 K 0.013 0.013 0.018 0.015 0.025 0.007 0.017 0.005 Sum 5.002 4.992 4.99 4.986 4.981 4.988 5.004 4.993 An 45.73 48.58 38.59 41.24 30.93 54.26 40.03 61.89 Ab 53 50.09 59.52 57.25 66.54 45.03 58.27 37.57 Or 1.27 1.33 1.88 1.51 2.54 0.72 1.69 0.54 "Leg 152, Hole 917A, core 20R4, 122-127 cm - Picrite - Unit 32B " 8 11 SiO2 49.43 47.92 Al2O3 30.75 31.22 FeOt 0.96 0.85 MgO 0.03 0.03 CaO 15.25 15.89 Na2O 2.91 2.76 K2O 0.12 0.04 Total 99.45 98.71 Structural formulae calculated with 8 oxygens Si 2.282 2.235 Al 1.673 1.716 Fet 0.037 0.033 Mg 0.002 0.002 Ca 0.754 0.794 Na 0.26 0.25 K 0.007 0.002 Sum 5.016 5.033 An 73.84 75.89 Ab 25.49 23.87 Or 0.67 0.24 "Leg 152, Hole 917A, core 23R3, 6-7 cm -Hyaloclastite tuff - Unit 35B " 78 85 87 89 90 SiO2 58.68 57.67 59.91 57.54 58.34 Al2O3 24.12 24.76 23.85 25.01 24.34 FeOt 0.62 0.54 0.49 0.51 0.58 MgO 0.02 0.01 0 0 0 CaO 7.32 8.16 6.55 8.33 7.57 Na2O 6.88 6.78 7.34 6.59 6.94 K2O 0.77 0.57 0.75 0.6 0.64 Total 98.4 98.49 98.89 98.58 98.41 Structural formulae calculated with 8 oxygens Si 2.674 2.633 2.708 2.624 2.66 Al 1.295 1.332 1.271 1.344 1.308 Fet 0.024 0.02 0.019 0.019 0.022 Mg 0.001 0.001 0 0 0 Ca 0.357 0.399 0.317 0.407 0.37 Na 0.608 0.6 0.643 0.583 0.614 K 0.045 0.033 0.043 0.035 0.037 Sum 5.004 5.018 5 5.013 5.011 An 35.38 38.66 31.6 39.72 36.23 Ab 60.17 58.1 64.09 56.87 60.11 Or 4.45 3.23 4.31 3.41 3.66 "Leg 152, Hole 917A, core 27R1, 2-3 cm - Aphyric basalt (dike) - Unit 39" 110 112 113 115 116 127 SiO2 49.33 51.79 50.05 49.72 50.78 50.04 Al2O3 31.15 29.61 30.02 30.41 30.02 29.42 FeO 0.77 0.95 0.8 0.98 0.95 1.3 MgO 0.16 0.19 0.26 0.27 0.19 0.31 CaO 15.89 13.74 15.22 15.37 14.79 14.65 Na2O 2.18 3.37 2.56 2.46 3.05 2.71 K2O 0.02 0.02 0.04 0.1 0.01 0.12 Total 99.49 99.67 98.96 99.31 99.79 98.54 Structural formulae calculated with 8 oxygens Si 2.271 2.367 2.314 2.295 2.328 2.327 Al 1.69 1.595 1.636 1.654 1.622 1.612 Fet 0.03 0.036 0.031 0.038 0.036 0.05 Mg 0.011 0.013 0.018 0.019 0.013 0.022 Ca 0.784 0.673 0.754 0.76 0.726 0.73 Na 0.195 0.299 0.229 0.22 0.271 0.244 K 0.001 0.001 0.003 0.006 0.001 0.007 Sum 4.982 4.985 4.984 4.991 4.997 4.992 An 80.01 69.2 76.47 77.05 72.76 74.41 Ab 19.89 30.7 23.26 22.34 27.17 24.89 Or 0.1 0.11 0.26 0.61 0.06 0.71 "Leg 152, Hole 917A, core 40R4, 78-81 cm - Aphyric basalt - Unit 52" 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 SiO2 53.75 54.78 52.06 54.4 53.79 52.93 53.46 52.74 54.94 53.48 53.91 54.66 52.72 52.04 55.26 54.23 54.79 Al2O3 29.2 28.14 29.44 27.9 28.27 28.65 28.78 29.46 28.09 28.71 28.26 27.48 28.17 29.64 27.43 28.21 27.72 FeOt 0.62 0.77 0.81 1.07 0.77 0.82 0.88 0.94 0.9 0.83 0.75 0.81 1.76 0.75 0.77 0.88 0.87 MgO 0.01 0.02 0.12 0 0.01 0.07 0.06 0.01 0.02 0.38 0.01 0.03 0.03 0.08 CaO 11.9 11.1 12.7 10.81 11.51 12.01 11.72 12.48 10.85 11.85 11.37 10.37 11.1 12.72 10.35 10.98 10.88 Na2O 4.81 5.23 4.39 5.37 4.76 4.87 4.76 4.65 5.2 4.55 4.71 5.43 4.66 4.05 5.41 5.08 5.32 K2O 0.33 0.43 0.27 0.37 0.35 0.31 0.35 0.32 0.42 0.33 0.33 0.45 0.37 0.29 0.49 0.4 0.42 Total 100.6 100.46 99.69 100.04 99.45 99.58 99.96 100.66 100.46 99.75 99.35 99.19 99.15 99.49 99.73 99.8 100.07 Structural formulae calculated with 8 oxygens Si 2.426 2.473 2.381 2.47 2.454 2.42 2.431 2.39 2.479 2.435 2.459 2.495 2.425 2.381 2.507 2.464 2.484 Al 1.553 1.497 1.587 1.493 1.52 1.544 1.542 1.573 1.494 1.54 1.519 1.479 1.527 1.598 1.466 1.511 1.48 Fet 0.023 0.029 0.031 0.041 0.029 0.031 0.033 0.036 0.034 0.032 0.029 0.031 0.068 0.029 0.029 0.033 0.033 Mg 0.001 0.001 0.008 0 0.001 0.005 0.004 0.001 0.001 0.026 0.001 0.002 0.002 0.005 Ca 0.575 0.537 0.622 0.526 0.563 0.588 0.571 0.606 0.524 0.578 0.556 0.507 0.547 0.623 0.503 0.535 0.528 Na 0.421 0.458 0.39 0.473 0.421 0.432 0.42 0.409 0.455 0.401 0.416 0.48 0.415 0.359 0.476 0.447 0.467 K 0.019 0.025 0.016 0.021 0.02 0.018 0.02 0.019 0.024 0.019 0.019 0.026 0.022 0.017 0.028 0.023 0.024 Sum 5.017 5.02 5.028 5.031 5.007 5.033 5.018 5.037 5.014 5.006 4.999 5.018 5.03 5.008 5.012 5.015 5.022 An 56.69 52.69 60.54 51.56 56.03 56.67 56.49 58.65 52.25 57.89 56.07 50.06 55.58 62.38 49.97 53.2 51.81 Ab 41.44 44.89 37.91 46.35 41.94 41.59 41.5 39.56 45.33 40.19 42 47.39 42.19 35.96 47.24 44.5 45.82 Or 1.87 2.42 1.56 2.1 2.03 1.74 2 1.8 2.42 1.92 1.93 2.56 2.22 1.66 2.79 2.3 2.37 "Leg 152, Hole 917A, core 45R1, 55-59 cm - Aphyric basalt - Unit 53" 1 4 22 23 24 35 36 37 40 41 43 44 SiO2 55.8 55.89 62.29 56.57 63.42 57.28 55.55 56.74 57.98 55.6 56.19 56.29 Al2O3 25.43 25.67 23.47 26.33 21.74 26.32 27.2 25.98 25.51 27.08 25.62 25.55 FeOt 1.18 0.95 0.19 0.96 0.34 0.66 0.62 0.64 0.8 0.81 1.31 0.88 MgO 0.25 0.07 0.03 0.07 0.01 0.06 0.06 0.05 0.28 0.07 CaO 9.38 9.51 5.67 9.8 4.14 9.3 10.15 9.18 8.58 10.41 9.38 9.31 Na2O 6.51 6.58 7.49 6.11 7.8 5.72 5.59 5.71 6.25 5.55 5.91 6.05 K2O 0.61 0.62 1.28 0.5 1.74 0.68 0.58 0.7 0.68 0.43 0.49 0.79 Total 99.15 99.3 100.42 100.34 99.19 99.96 99.75 98.94 99.86 99.92 99.18 98.93 Structural formulae calculated with 8 oxygens Si 2.556 2.554 2.762 2.552 2.84 2.58 2.518 2.583 2.613 2.519 2.565 2.574 Al 1.373 1.383 1.226 1.4 1.147 1.397 1.453 1.393 1.355 1.445 1.378 1.377 Fet 0.045 0.036 0.007 0.036 0.013 0.025 0.024 0.024 0.03 0.031 0.05 0.034 Mg 0.017 0.005 0.002 0.005 0.001 0.004 0.004 0.003 0.019 0.005 Ca 0.46 0.466 0.269 0.474 0.199 0.449 0.493 0.448 0.414 0.505 0.459 0.456 Na 0.578 0.583 0.644 0.535 0.677 0.499 0.492 0.504 0.546 0.487 0.523 0.536 K 0.036 0.036 0.072 0.029 0.099 0.039 0.034 0.041 0.039 0.025 0.028 0.046 Sum 5.065 5.064 4.983 5.03 4.975 4.99 5.017 4.993 5.002 5.015 5.022 5.028 An 42.85 42.92 27.34 45.67 20.38 45.47 48.41 45.13 41.44 49.65 45.43 43.94 Ab 53.82 53.74 65.33 51.55 69.41 50.6 48.29 50.77 54.63 47.89 51.78 51.63 Or 3.33 3.34 7.33 2.78 10.2 3.93 3.3 4.1 3.92 2.46 2.8 4.43 "Leg 152, Hole 917A, core 47R2, 38-42 cm - Dacite - Unit 54" 285 286 287 288 289 290 291 293 294 295 297 298 299 309 310 311 347 348 302 303 304 305 316 321 343 344 SiO2 48.18 48.05 54.75 54.22 51.44 50.27 50.59 48.81 47.16 56.42 51.76 48.72 53.54 46.71 50.16 55.27 54.87 55.3 61.22 60.58 60.67 64.66 61.66 61 62.14 61.45 Al2O3 32.17 32.56 27.12 27.62 30.16 30.71 30.76 31.48 33.32 27.11 29.71 32.1 28.39 32.84 30.1 27.87 27.28 27.34 23.21 23.54 24.06 20.74 23.35 23.67 23.99 23.28 FeOt 0.68 0.69 0.98 0.96 0.77 0.79 0.74 0.73 0.71 1.01 0.7 0.83 0.83 0.55 0.78 0.94 0.88 0.89 0.65 0.62 0.69 0.34 0.62 0.69 0.64 0.64 MgO 0.07 0 0.04 0.01 0.05 0.06 0.05 0.11 0.07 0.01 0.19 0.04 0.08 0.15 0.07 0 0.01 0 0 0 0 0 0.02 0 0 0 CaO 16.19 16.67 10.39 10.88 13.9 14.6 14.55 15.37 17.45 9.99 13.86 16.06 12.17 17.03 14.33 10.85 10.75 10.07 5.97 6.09 6.39 2.19 5.24 5.88 6.09 5.43 Na2O 2.4 2.09 5.32 4.81 3.45 3.1 3.24 2.62 1.45 5.66 3.78 2.29 4.42 1.89 3.28 5.26 4.88 5.63 7.55 7.36 7.52 7.99 7.86 7.38 7.28 7.54 K2O 0.05 0.05 0.38 0.46 0.13 0.18 0.09 0.06 0.01 0.5 0.16 0.08 0.3 0.05 0.14 0.41 0.37 0.5 0.87 1.01 0.85 3.34 1.14 1.08 1.32 1.15 Total 99.74 100.11 98.96 98.96 99.89 99.71 100.02 99.18 100.19 100.69 100.16 100.11 99.73 99.21 98.86 100.6 99.03 99.73 99.47 99.2 100.18 99.27 99.89 99.72 101.45 99.49 Structural formulae calculated with 8 oxygens Si 2.22 2.207 2.505 2.483 2.348 2.307 2.312 2.256 2.168 2.534 2.359 2.235 2.439 2.169 2.321 2.49 2.506 2.51 2.747 2.729 2.71 2.898 2.753 2.732 2.737 2.755 Al 1.747 1.763 1.462 1.491 1.623 1.661 1.657 1.715 1.805 1.435 1.596 1.735 1.525 1.797 1.641 1.48 1.468 1.462 1.227 1.25 1.266 1.096 1.228 1.25 1.245 1.23 Fet 0.026 0.026 0.037 0.037 0.029 0.03 0.028 0.028 0.027 0.038 0.027 0.032 0.031 0.021 0.03 0.035 0.034 0.034 0.024 0.023 0.026 0.013 0.023 0.026 0.024 0.024 Mg 0.005 0 0.003 0.001 0.003 0.004 0.004 0.007 0.005 0 0.013 0.003 0.005 0.01 0.005 0 0 0 0 0 0 0 0.001 0 0 0 Ca 0.799 0.821 0.509 0.534 0.68 0.718 0.712 0.761 0.86 0.481 0.677 0.789 0.594 0.847 0.71 0.524 0.526 0.49 0.287 0.294 0.306 0.105 0.251 0.282 0.287 0.261 Na 0.214 0.186 0.472 0.427 0.305 0.276 0.287 0.235 0.13 0.493 0.334 0.203 0.391 0.17 0.294 0.46 0.432 0.496 0.656 0.643 0.651 0.694 0.68 0.641 0.622 0.655 K 0.003 0.003 0.022 0.027 0.008 0.01 0.005 0.004 0.001 0.029 0.009 0.005 0.017 0.003 0.008 0.023 0.021 0.029 0.05 0.058 0.048 0.191 0.065 0.061 0.074 0.066 Sum 5.015 5.006 5.011 4.999 4.997 5.006 5.005 5.006 4.995 5.009 5.014 5.002 5.003 5.019 5.01 5.012 4.987 5.021 4.992 4.997 5.007 4.997 5.002 4.993 4.989 4.991 An 78.67 81.28 50.77 54.08 68.48 71.51 70.95 76.18 86.84 47.95 66.37 79.13 59.26 83.03 70.16 52.02 53.73 48.28 28.87 29.56 30.4 10.61 25.17 28.64 29.21 26.57 Ab 21.06 18.44 47.03 43.21 30.74 27.45 28.55 23.47 13.09 49.18 32.73 20.39 39 16.67 29.06 45.65 44.09 48.85 66.09 64.64 64.8 70.1 68.31 65.12 63.25 66.72 Or 0.27 0.28 2.2 2.72 0.79 1.04 0.51 0.35 0.07 2.86 0.9 0.48 1.75 0.3 0.79 2.33 2.19 2.87 5.03 5.8 4.81 19.29 6.52 6.24 7.54 6.71 "Leg 152, Hole 917A, core 53R1, 15-18 cm - Ash flow tuff - Unit 56" 123 124 125 129 134 136 142 SiO2 63.56 63.65 63.79 64.2 61.75 64.01 64 Al2O3 20.98 20.75 21.01 20.65 21.84 20.72 20.94 FeO 0.45 0.39 0.42 0.39 0.55 0.41 0.48 MgO 0.02 0 0 0 0 0 0 CaO 3.09 2.92 2.89 2.77 4.48 2.68 2.87 Na2O 7.77 7.71 7.54 7.86 7.32 7.49 7.45 K2O 3.16 3.09 3.21 3.03 2.63 3.61 3.47 Total 99.03 98.51 98.86 98.89 98.58 98.92 99.2 Structural formulae calculated with 8 oxygens Si 2.865 2.879 2.875 2.89 2.805 2.886 2.877 Al 1.114 1.106 1.116 1.095 1.169 1.101 1.11 Fet 0.017 0.015 0.016 0.015 0.021 0.015 0.018 Mg 0.001 0 0 0 0 0 0 Ca 0.149 0.141 0.139 0.133 0.218 0.129 0.138 Na 0.679 0.676 0.659 0.686 0.645 0.655 0.649 K 0.182 0.179 0.184 0.174 0.153 0.208 0.199 Sum 5.008 4.996 4.989 4.992 5.01 4.995 4.992 An 14.79 14.18 14.19 13.43 21.46 13.05 14.03 Ab 67.21 67.9 67.07 69.07 63.51 66.03 65.83 Or 18 17.92 18.75 17.5 15.03 20.92 20.15 "Leg 152, Hole 917A, core 55R4, 98-101 cm - Olivine-plagioclase-pyroxene-phyric basalt- Unit 60" 46 47 63 64 65 66 67 68 69 70 71 72 73 74 75 76 79 80 81 82 SiO2 45.85 49.49 45.65 45.82 46.24 46.21 45.98 51.21 50.19 49.01 47.16 47.93 50.53 51.86 46.58 51.68 46.4 46.96 52.23 46.66 Al2O3 34.02 31.2 33.66 33.83 33.66 33.26 33.69 30.14 30.56 30.64 32.91 32.46 30.35 28.59 33.63 29.64 32.81 33 29.11 33.07 FeOt 0.73 0.83 0.55 0.57 0.57 0.57 0.71 1.15 1.09 1.46 0.66 0.79 1.24 1.21 0.88 1.09 0.66 0.78 1.06 0.71 MgO 0.06 0.06 0.07 0.03 0.07 0.07 0.04 0.05 0.01 0.53 0.1 0.05 0.18 0.03 0.03 0.1 0.08 0.02 0.04 0.05 CaO 18.26 15.13 18.64 18.49 18.2 18.11 18.05 13.8 14.53 14.84 17.17 16.77 14.3 12.87 17.76 13.32 17.21 16.8 12.72 17.68 Na2O 1.56 3.1 1.48 1.37 1.46 1.66 1.76 3.76 3.5 3.01 2.03 2.35 3.58 4.43 2.04 3.98 2.05 2.17 4.64 1.94 K2O 0.03 0.1 0.04 0.02 0.02 0.03 0.04 0.22 0.16 0.14 0.03 0.04 0.2 0.28 0.05 0.21 0.01 0.08 0.24 0.02 Total 100.52 99.9 100.1 100.13 100.22 99.91 100.26 100.32 100.08 99.62 100.06 100.4 100.37 99.26 100.96 100.02 99.22 99.8 100.04 100.13 Structural formulae calculated with 8 oxygens Si 2.113 2.273 2.113 2.118 2.132 2.139 2.123 2.337 2.302 2.265 2.174 2.201 2.311 2.39 2.136 2.361 2.159 2.171 2.386 2.154 Al 1.847 1.688 1.836 1.842 1.829 1.814 1.834 1.621 1.652 1.669 1.787 1.756 1.636 1.553 1.818 1.596 1.8 1.798 1.567 1.799 Fet 0.028 0.032 0.021 0.022 0.022 0.022 0.027 0.044 0.042 0.056 0.025 0.03 0.047 0.047 0.034 0.042 0.026 0.03 0.04 0.028 Mg 0.004 0.004 0.005 0.002 0.005 0.005 0.003 0.004 0.001 0.037 0.007 0.003 0.012 0.002 0.002 0.007 0.006 0.001 0.003 0.003 Ca 0.902 0.745 0.924 0.916 0.899 0.898 0.893 0.675 0.714 0.735 0.848 0.825 0.701 0.636 0.873 0.652 0.858 0.832 0.623 0.875 Na 0.14 0.276 0.133 0.123 0.13 0.149 0.158 0.333 0.311 0.27 0.181 0.209 0.317 0.396 0.182 0.353 0.185 0.194 0.411 0.173 K 0.002 0.006 0.002 0.001 0.001 0.002 0.002 0.013 0.01 0.008 0.002 0.002 0.012 0.017 0.003 0.012 0.001 0.005 0.014 0.001 Sum 5.035 5.024 5.036 5.023 5.019 5.029 5.04 5.025 5.032 5.039 5.024 5.027 5.036 5.039 5.047 5.023 5.034 5.03 5.043 5.034 An 86.44 72.55 87.23 88.08 87.26 85.6 84.83 66.13 68.99 72.57 82.23 79.56 68.04 60.66 82.53 64.11 82.18 80.71 59.46 83.36 Ab 13.39 26.89 12.54 11.83 12.63 14.22 14.97 32.64 30.08 26.63 17.59 20.2 30.81 37.76 17.18 34.68 17.74 18.85 39.22 16.51 Or 0.17 0.56 0.23 0.09 0.11 0.19 0.2 1.24 0.93 0.8 0.18 0.24 1.15 1.58 0.29 1.21 0.08 0.44 1.32 0.13 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 172 174 175 176 177 181 207 208 209 210 211 SiO2 47.42 50.73 47.03 45.23 51.45 50.85 47.99 48.68 46.26 48.57 49.75 Al2O3 32.17 29.89 32.49 33.57 29.38 29.44 31.66 31.99 32.99 31.79 31.23 FeO 0.43 0.57 0.51 0.54 0.5 0.69 0.61 0.57 0.57 0.44 0.77 MgO 0.07 0.11 0.14 0.07 0.13 0.15 0 0.12 0.17 0.02 CaO 16.27 14.25 17 17.86 13.42 13.23 15.9 15.7 17.46 15.51 14.99 Na2O 2.21 3.43 1.82 1.24 3.85 4.08 2.39 2.5 1.53 2.51 2.82 K2O 0.06 0.12 0.02 0.03 0.14 0.21 0.08 0.09 0.03 0.06 0.1 Total 98.64 99.1 99.02 98.54 98.87 98.51 98.79 99.52 98.95 99.04 99.68 Structural formulae calculated with 8 oxygens Si 2.208 2.338 2.186 2.12 2.37 2.357 2.231 2.242 2.155 2.246 2.284 Al 1.766 1.623 1.78 1.854 1.595 1.608 1.734 1.736 1.812 1.732 1.69 Fet 0.017 0.022 0.02 0.021 0.019 0.027 0.024 0.022 0.022 0.017 0.03 Mg 0.005 0.007 0.01 0.005 0.009 0.011 0 0.008 0.012 0.001 Ca 0.812 0.704 0.846 0.897 0.662 0.657 0.792 0.775 0.871 0.768 0.737 Na 0.2 0.306 0.164 0.112 0.344 0.367 0.216 0.223 0.138 0.225 0.251 K 0.003 0.007 0.001 0.002 0.008 0.013 0.005 0.005 0.002 0.003 0.006 Sum 5.01 5.007 5.007 5.01 5.008 5.029 5.012 5.004 5.009 5.003 4.999 An 79.98 69.17 83.65 88.72 65.25 63.38 78.21 77.26 86.19 77.09 74.17 Ab 19.68 30.12 16.23 11.13 33.92 35.4 21.31 22.24 13.64 22.57 25.26 Or 0.34 0.71 0.12 0.15 0.83 1.22 0.48 0.5 0.17 0.34 0.57 "Leg 152, Hole 917A, core 67R-3, 130-132 cm - Olivine-plagioclase-pyroxene-phyric basalt - Unit 70" 133 134 135 136 137 138 139 140 141 142 144 145 146 147 148 149 150 SiO2 50.79 53.79 52.83 51.52 52.89 52.95 52.43 51.93 51.32 54.49 51.34 55.86 54.77 52.15 53.74 52.1 52.51 Al2O3 30.51 28.44 28.3 29.6 28.07 28.78 28.48 29.16 29.49 27.46 29.83 26.67 27.22 29.25 27.51 29 29.23 FeOt 0.72 0.96 0.87 0.94 0.67 0.67 0.93 0.69 0.64 0.9 0.7 0.87 0.9 0.75 0.6 0.28 0.65 MgO 0.01 0.07 0.02 0.04 0.03 0.06 0.11 0.04 0.06 0.07 0.04 0.04 0.03 0.03 0 0.04 CaO 13.89 11.62 12.07 13.27 11.83 12.49 12.59 12.85 13.26 10.78 13.42 10.14 10.8 12.74 11.24 12.62 12.77 Na2O 3.88 4.77 4.52 4.19 4.69 4.37 4.57 4.28 4.13 5.55 4.18 5.76 5.42 4.32 5.35 4.6 4.41 K2O 0.21 0.4 0.33 0.29 0.4 0.37 0.3 0.34 0.23 0.42 0.24 0.67 0.43 0.27 0.4 0.3 0.28 Total 100.01 99.98 98.99 99.81 98.59 99.66 99.37 99.36 99.11 99.64 99.77 100 99.58 99.5 98.88 98.9 99.87 Structural formulae calculated with 8 oxygens Si 2.323 2.445 2.428 2.36 2.439 2.417 2.408 2.384 2.363 2.483 2.351 2.532 2.496 2.388 2.469 2.397 2.395 Al 1.645 1.524 1.533 1.598 1.525 1.549 1.542 1.577 1.6 1.475 1.61 1.424 1.462 1.579 1.49 1.573 1.571 Fet 0.027 0.036 0.033 0.036 0.026 0.026 0.036 0.026 0.025 0.034 0.027 0.033 0.034 0.029 0.023 0.011 0.025 Mg 0.001 0.005 0.001 0.003 0.002 0.004 0.007 0.003 0.004 0.005 0.003 0.003 0.002 0.002 0 0.003 Ca 0.681 0.566 0.594 0.651 0.584 0.611 0.62 0.632 0.654 0.526 0.658 0.492 0.527 0.625 0.553 0.622 0.624 Na 0.344 0.42 0.403 0.372 0.419 0.387 0.407 0.381 0.369 0.49 0.371 0.506 0.479 0.384 0.477 0.41 0.39 K 0.012 0.023 0.019 0.017 0.024 0.022 0.017 0.02 0.013 0.024 0.014 0.039 0.025 0.016 0.024 0.018 0.016 Sum 5.033 5.015 5.016 5.035 5.02 5.013 5.033 5.028 5.028 5.037 5.036 5.029 5.026 5.022 5.037 5.031 5.023 An 65.65 56.06 58.46 62.6 56.9 59.94 59.35 61.18 63.11 50.58 63.1 47.46 51.11 61.01 52.51 59.22 60.58 Ab 33.19 41.65 39.65 35.76 40.79 37.94 38.98 36.91 35.61 47.09 35.57 48.8 46.46 37.45 45.24 39.08 37.83 Or 1.16 2.29 1.89 1.64 2.31 2.12 1.67 1.91 1.28 2.33 1.33 3.74 2.43 1.54 2.25 1.69 1.59 "Leg 152, Hole 917A, core 72R-1, 82-85 cm - Olivine-phyric basalt - Unit 73A " 4 5 6 10 23 24 25 28 49 SiO2 47.21 48.39 51.2 50.2 54.06 54.81 56.65 49.41 52.84 Al2O3 32.47 31.46 29.35 30.45 27.53 26.86 25.87 30.37 28.49 FeOt 0.72 0.48 0.94 0.69 0.85 0.94 0.85 0.55 0.77 MgO 0.16 0.16 0.08 0.19 0.07 0.06 0.01 0.2 0.08 CaO 16.61 15.75 13.55 14.77 11.37 10.81 9.35 15.03 12.55 Na2O 2.22 2.86 3.88 3.03 5.15 5.56 6.41 3.14 4.53 K2O 0 0.04 0.06 0.03 0.12 0.12 0.2 0.04 0.08 Total 99.38 99.12 99.06 99.36 99.14 99.16 99.33 98.74 99.33 Structural formulae calculated with 8 oxygens Si 2.188 2.242 2.361 2.31 2.473 2.505 2.574 2.292 2.42 Al 1.774 1.717 1.595 1.651 1.485 1.447 1.385 1.66 1.538 Fet 0.028 0.018 0.036 0.027 0.032 0.036 0.032 0.021 0.029 Mg 0.011 0.011 0.006 0.013 0.005 0.004 0.001 0.014 0.005 Ca 0.825 0.782 0.669 0.728 0.557 0.529 0.455 0.747 0.616 Na 0.199 0.257 0.347 0.27 0.457 0.493 0.564 0.283 0.402 K 0 0.002 0.004 0.002 0.007 0.007 0.012 0.003 0.005 Sum 5.025 5.029 5.017 5.001 5.016 5.021 5.022 5.02 5.015 An 80.52 75.1 65.64 72.83 54.59 51.43 44.12 72.38 60.21 Ab 19.46 24.69 33.99 27.01 44.74 47.9 54.74 27.37 39.32 Or 0.01 0.21 0.37 0.16 0.67 0.67 1.14 0.25 0.46 "Leg 152, Hole 917A, core 79R-2, 64-67 cm - Olivine-phyric basalt - Unit 78" 16 17 18 20 21 22 128 129 130 131 132 144 145 SiO2 51.38 50.41 51.53 50.81 50.65 49.16 49.58 51.91 49.32 53.66 49.7 52.08 50.58 Al2O3 29.7 30.69 29.96 29.64 30.62 30.78 31.14 29.85 31.62 26.19 31.97 29.62 30.41 FeOt 0.52 0.54 0.64 0.59 0.7 0.57 0.55 0.81 0.53 2.06 0.5 0.73 0.6 MgO 0.26 0.2 0.2 0.13 0.17 0.14 0.15 0.16 0.19 1.82 0.16 0.2 0.21 CaO 13.62 14.45 13.43 13.82 14.42 14.69 15.22 13.38 15.24 9.76 15.76 13.33 14.46 Na2O 4.07 3.42 3.83 3.59 3.16 3.14 2.92 3.9 2.89 5.05 2.56 3.81 3.44 K2O 0.09 0.11 0.13 0.09 0.14 0.06 0.07 0.11 0.09 0.27 0.06 0.13 0.13 Total 99.65 99.81 99.72 98.66 99.85 98.54 99.64 100.1 99.88 98.81 100.7 99.9 99.83 Structural formulae calculated with 8 oxygens Si 2.353 2.309 2.355 2.349 2.317 2.283 2.279 2.364 2.262 2.473 2.26 2.374 2.317 Al 1.603 1.657 1.614 1.615 1.651 1.685 1.687 1.602 1.709 1.423 1.713 1.591 1.642 Fet 0.02 0.021 0.024 0.023 0.027 0.022 0.021 0.031 0.02 0.079 0.019 0.028 0.023 Mg 0.017 0.014 0.013 0.009 0.011 0.01 0.011 0.011 0.013 0.125 0.011 0.014 0.015 Ca 0.668 0.709 0.658 0.684 0.707 0.731 0.749 0.653 0.749 0.482 0.768 0.651 0.71 Na 0.361 0.303 0.34 0.322 0.28 0.283 0.26 0.344 0.257 0.451 0.225 0.337 0.305 K 0.005 0.006 0.008 0.005 0.008 0.004 0.004 0.007 0.005 0.016 0.003 0.008 0.007 Sum 5.029 5.018 5.012 5.007 5.002 5.017 5.01 5.01 5.015 5.049 4.998 5.002 5.018 An 64.6 69.61 65.44 67.67 71.02 71.85 73.94 65.06 74.05 50.79 77.05 65.41 69.42 Ab 34.91 29.78 33.8 31.8 28.17 27.78 25.64 34.29 25.41 47.52 22.61 33.84 29.86 Or 0.49 0.61 0.76 0.54 0.81 0.37 0.41 0.65 0.54 1.69 0.34 0.75 0.72 "Leg 152, Hole 917A, core 87R-5, 42-46 cm - Aphyric olivine basalt - Unit 84" 8 10 30 31 32 33 34 43 44 48 SiO2 54.17 55.13 54.62 50.57 54.66 49.33 54.91 50.65 50.82 54.67 Al2O3 27.73 27.65 27.47 29.99 27.63 30.79 27.76 29.9 29.71 26.89 FeO 0.78 1.11 0.76 0.78 0.86 0.86 0.94 0.65 0.72 0.88 MgO 0.03 0.15 0.02 0.08 0.09 0.03 CaO 11.11 10.14 10.51 13.16 10.14 14.2 10.76 13.66 13.67 10.2 Na2O 4.98 5.64 5.44 3.85 5.49 3.27 5.45 3.66 3.72 5.66 K2O 0.25 0.41 0.34 0.21 0.38 0.13 0.3 0.12 0.42 Total 99.04 100.23 99.13 98.56 99.17 98.59 100.14 98.61 98.84 98.76 Structural formulae calculated with 8 oxygens Si 2.477 2.493 2.494 2.341 2.494 2.291 2.486 2.342 2.347 2.509 Al 1.494 1.474 1.478 1.637 1.486 1.685 1.481 1.629 1.617 1.454 Fet 0.03 0.042 0.029 0.03 0.033 0.034 0.036 0.025 0.028 0.034 Mg 0.002 0.01 0.001 0.005 0.006 0.002 Ca 0.544 0.491 0.514 0.653 0.496 0.706 0.522 0.677 0.677 0.502 Na 0.441 0.495 0.482 0.345 0.486 0.294 0.479 0.328 0.333 0.504 K 0.014 0.024 0.02 0.012 0.022 0.008 0.017 0.007 0.025 Sum 5.003 5.029 5.017 5.019 5.017 5.018 5.022 5.006 5.015 5.029 An 54.42 48.66 50.64 64.61 49.4 70.05 51.27 67.36 66.56 48.68 Ab 44.15 48.98 47.43 34.16 48.4 29.18 47.04 32.64 32.76 48.91 Or 1.43 2.36 1.93 1.23 2.2 0.78 1.7 0.68 2.41 "Leg 152, Hole 917A, core 88R-7, 83-86 cm - Aphyric olivine basalt - Unit 84" 19 20 28 29 42 45 46 47 53 55 72 73 85 86 87 SiO2 51.62 54.29 50.11 53.78 49.78 57.46 50.4 54.01 50.4 49.96 51.57 52.21 54.24 55.28 54.11 Al2O3 29.11 27.8 30.93 28.33 30.79 25.84 30.3 28.25 30.36 30.61 29.78 29.48 27.85 27.54 28.13 FeO 0.58 0.77 0.85 0.83 0.77 0.8 0.78 0.81 0.78 0.91 0.82 0.81 0.75 0.79 0.94 MgO 0.05 0.03 0.04 0.01 0.01 0.01 0.03 0.02 0.02 CaO 13 11.44 14.79 11.63 14.84 8.47 14.17 11.43 14.23 14.22 13.73 12.88 11.27 10.34 11.41 Na2O 3.93 4.86 2.98 4.64 3.06 5.93 3.4 4.73 3.28 3.15 3.61 3.81 4.94 4.89 4.75 K2O 0.23 0.34 0.18 0.34 0.14 0.64 0.19 0.32 0.21 0.2 0.21 0.26 0.32 0.48 0.3 Total 98.51 99.52 99.84 99.54 99.39 99.17 99.25 99.56 99.27 99.05 99.71 99.46 99.39 99.34 99.66 Structural formulae calculated with 8 oxygens Si 2.385 2.474 2.298 2.452 2.294 2.604 2.322 2.46 2.321 2.308 2.36 2.388 2.473 2.512 2.463 Al 1.585 1.493 1.671 1.522 1.672 1.38 1.645 1.516 1.648 1.666 1.606 1.589 1.497 1.475 1.509 Fet 0.022 0.029 0.033 0.031 0.03 0.03 0.03 0.031 0.03 0.035 0.031 0.031 0.029 0.03 0.036 Mg 0.003 0.002 0.002 0.001 0.001 0 0.002 0.002 0.001 Ca 0.644 0.558 0.726 0.568 0.733 0.411 0.7 0.558 0.702 0.704 0.673 0.631 0.55 0.503 0.556 Na 0.352 0.43 0.265 0.41 0.273 0.521 0.304 0.418 0.293 0.282 0.32 0.338 0.437 0.431 0.419 K 0.013 0.02 0.011 0.02 0.008 0.037 0.011 0.019 0.012 0.012 0.012 0.015 0.018 0.028 0.018 Sum 5.005 5.005 5.004 5.003 5.01 4.985 5.013 5.001 5.008 5.006 5.003 4.994 5.006 4.98 5.002 An 63.79 55.42 72.47 56.93 72.26 42.46 68.98 56.1 69.69 70.56 66.96 64.11 54.72 52.31 56.01 Ab 34.87 42.64 26.47 41.07 26.92 53.74 29.94 42.03 29.1 28.25 31.82 34.34 43.45 44.8 42.22 Or 1.34 1.94 1.06 2 0.82 3.8 1.08 1.87 1.21 1.2 1.23 1.55 1.82 2.89 1.77 "Leg 152, Hole 917A, core 90R-1, 58-59 cm - Olivine-plagioclase-phyric basalt - Unit 85" 84 85 86 87 88 90 91 92 93 94 95 96 97 98 SiO2 49.68 48.09 57.73 52.59 51.6 48.87 52.82 57.58 49.37 54.07 49.72 56.24 54.46 61.05 Al2O3 30.42 31.28 25.02 28.79 29.42 30.84 28.68 25.28 31 27.32 30.81 26.01 27.45 23.32 FeO 0.51 0.46 0.75 0.69 0.7 0.59 0.62 0.7 0.56 0.67 0.66 0.79 0.62 0.71 MgO 0.19 0.14 0.02 0.13 0.11 0.12 0.09 0.01 0.14 0.08 0.1 0.06 0.07 0 CaO 14.84 16.07 8.14 12.71 13.53 15.38 12.42 8.62 15.56 11.27 14.8 9.47 11.4 5.81 Na2O 3.12 2.77 7.06 4.63 4.11 2.94 4.49 6.61 2.98 5.19 3.19 6.02 5.05 7.69 K2O 0.07 0.04 0.41 0.12 0.09 0.04 0.11 0.36 0.06 0.19 0.07 0.3 0.22 0.58 Total 98.84 98.84 99.13 99.65 99.54 98.77 99.23 99.17 99.66 98.78 99.35 98.88 99.27 99.17 Strucutral Formulae calculated with 8 oxygens Si 2.3 2.237 2.621 2.404 2.366 2.27 2.418 2.612 2.273 2.481 2.291 2.566 2.485 2.744 Al 1.659 1.715 1.339 1.551 1.589 1.688 1.548 1.352 1.681 1.477 1.673 1.398 1.476 1.236 Fet 0.02 0.018 0.028 0.026 0.027 0.023 0.024 0.027 0.022 0.026 0.025 0.03 0.024 0.027 Mg 0.013 0.009 0.001 0.009 0.007 0.008 0.006 0.001 0.009 0.006 0.007 0.004 0.005 0 Ca 0.736 0.801 0.396 0.622 0.664 0.765 0.609 0.419 0.767 0.554 0.731 0.463 0.558 0.28 Na 0.28 0.249 0.621 0.41 0.366 0.265 0.398 0.582 0.266 0.461 0.285 0.532 0.447 0.671 K 0.004 0.002 0.024 0.007 0.005 0.002 0.006 0.021 0.003 0.011 0.004 0.018 0.013 0.033 Sum 5.013 5.032 5.032 5.029 5.025 5.02 5.01 5.013 5.021 5.016 5.017 5.01 5.007 4.99 An 72.11 76.08 38.04 59.86 64.19 74.11 60.07 41.03 74.02 53.98 71.64 45.68 54.81 28.45 Ab 27.46 23.7 59.68 39.47 35.31 25.66 39.29 56.92 25.67 44.96 27.93 52.58 43.94 68.18 Or 0.43 0.23 2.28 0.67 0.5 0.24 0.64 2.06 0.32 1.06 0.42 1.74 1.25 3.37 "Leg 152, Hole 917A, core 94R-1, 71-74 cm - Aphyric olivine basalt - Unit 87" 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 172 173 174 175 176 SiO2 60.88 56.12 52.48 52.55 53.5 55.32 59.37 54.27 53.93 53.28 53.02 50.32 52.45 50.06 57.34 50.67 54.73 52.55 53.04 55.53 56.38 57.25 55.63 55.53 52.6 Al2O3 23.66 26.9 28.95 28.48 28.27 27.31 24.2 27.87 27.8 28.44 28.53 30.47 29.28 31.1 26.24 30.62 27.6 29.45 28.31 27.16 26.58 25.82 26.88 27.21 28.37 FeO 0.61 0.8 0.78 0.83 1.06 0.93 0.66 0.78 0.91 0.74 0.91 0.84 1 0.91 0.75 0.74 0.79 0.89 0.91 0.98 0.58 0.63 0.79 0.76 0.86 MgO 0.05 0.02 0.05 0.05 0.04 0.04 0.04 0.03 0.03 0.01 0.08 0.04 0 0 0.01 0.03 0.04 0.02 0.04 0.1 0.06 CaO 5.74 9.96 12.57 12.47 11.77 10.44 6.73 11.14 11.22 11.76 12.07 14.1 12.38 14.93 8.77 14.13 10.85 12.88 11.64 10.26 9.46 8.74 10.11 10.11 12.42 Na2O 7.66 5.85 4.42 4.39 4.85 5.44 7.41 5 4.92 4.66 4.77 3.42 4.33 2.93 6.58 3.72 5.13 4.18 4.77 5.69 6.09 6.25 5.84 5.56 4.58 K2O 1 0.37 0.18 0.19 0.25 0.45 0.82 0.35 0.29 0.21 0.19 0.12 0.21 0.1 0.51 0.15 0.28 0.18 0.28 0.38 0.45 0.47 0.35 0.37 0.19 Total 99.55 100.06 99.4 98.97 99.75 99.92 99.18 99.41 99.11 99.12 99.51 99.29 99.65 100.11 100.18 100.07 99.38 100.12 98.96 100.03 99.58 99.17 99.63 99.63 99.08 Structural formulae calculated with 8 oxygens Si 2.731 2.535 2.403 2.417 2.44 2.508 2.684 2.474 2.468 2.439 2.424 2.317 2.396 2.29 2.58 2.317 2.492 2.39 2.436 2.514 2.554 2.596 2.526 2.518 2.418 Al 1.251 1.432 1.563 1.544 1.52 1.459 1.289 1.497 1.499 1.534 1.537 1.654 1.577 1.677 1.392 1.65 1.481 1.579 1.533 1.449 1.419 1.38 1.438 1.454 1.537 Fet 0.023 0.03 0.03 0.032 0.04 0.035 0.025 0.03 0.035 0.028 0.035 0.032 0.038 0.035 0.028 0.028 0.03 0.034 0.035 0.037 0.022 0.024 0.03 0.029 0.033 Mg 0.003 0.002 0.004 0.003 0.003 0.003 0.003 0.002 0.002 0.001 0.005 0.003 0 0 0.001 0.002 0.003 0.001 0.003 0.006 0.004 Ca 0.276 0.482 0.617 0.614 0.575 0.507 0.326 0.544 0.55 0.577 0.591 0.696 0.606 0.732 0.423 0.692 0.53 0.628 0.573 0.498 0.459 0.425 0.492 0.491 0.612 Na 0.666 0.512 0.392 0.392 0.429 0.478 0.649 0.442 0.437 0.414 0.423 0.305 0.383 0.26 0.574 0.33 0.453 0.369 0.424 0.5 0.535 0.549 0.514 0.489 0.408 K 0.057 0.022 0.01 0.011 0.015 0.026 0.047 0.02 0.017 0.012 0.011 0.007 0.012 0.006 0.029 0.009 0.016 0.011 0.016 0.022 0.026 0.027 0.02 0.021 0.011 Sum 5.005 5.016 5.017 5.013 5.022 5.015 5.02 5.008 5.009 5.007 5.024 5.012 5.013 5.004 5.026 5.028 5.002 5.01 5.018 5.022 5.017 5.002 5.022 5.009 5.023 An 27.63 47.47 60.52 60.41 56.47 50.15 31.86 54.04 54.78 57.51 57.68 69.05 60.51 73.39 41.2 67.18 53.03 62.33 56.51 48.81 45.01 42.42 47.92 49.08 59.33 Ab 66.66 50.41 38.46 38.5 42.08 47.26 63.5 43.94 43.51 41.28 41.22 30.26 38.27 26.03 55.96 31.99 45.35 36.61 41.88 49.03 52.44 54.87 50.09 48.8 39.58 Or 5.72 2.12 1.01 1.09 1.45 2.59 4.64 2.03 1.71 1.21 1.09 0.69 1.22 0.59 2.84 0.84 1.62 1.06 1.61 2.16 2.55 2.7 1.99 2.12 1.09 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 218 219 220 221 223 224 225 226 227 228 229 230 231 234 238 239 240 243 252 253 255 256 SiO2 60.02 58.08 50.53 62.32 53.89 53.62 50.25 50.69 57.82 51.82 51.03 50.47 52.28 54.76 60.07 60.35 54.25 67.01 61.82 64.95 59.52 62.01 Al2O3 23.88 24.95 30.06 22.99 28.24 28.66 30.6 30.63 26.07 29.59 30.18 30.23 29.36 27.22 24.18 24.26 28.28 18.45 22.78 20.72 24.39 22.77 FeO 0.56 0.66 0.78 0.47 0.87 0.84 0.79 0.79 0.78 0.89 0.75 0.87 0.87 1 0.63 0.69 0.87 0.68 0.71 0.69 0.64 0.54 MgO 0.02 0.02 0.01 0.06 0.1 0.03 0.02 0.01 0.12 0.02 0.05 0.08 0.07 0.02 0 CaO 5.91 7.49 13.52 4.42 11.29 12.13 13.96 14.09 8.48 12.97 13.5 13.63 12.64 10.21 6.14 6.24 11.06 0.48 4.65 2.28 6.85 4.73 Na2O 7.86 7.02 3.96 8.27 5.16 4.85 3.51 3.57 6.56 4.35 3.86 3.73 4.22 5.76 7.81 7.41 5.12 7.99 7.94 8.26 7.41 8.31 K2O 0.97 0.59 0.14 1.3 0.25 0.19 0.12 0.12 0.53 0.17 0.12 0.17 0.21 0.33 0.78 0.91 0.34 5.36 1.51 3.08 0.74 1.07 Total 99.2 98.8 99.01 99.78 99.76 100.39 99.27 99.9 100.24 99.79 99.55 99.12 99.61 99.36 99.62 99.85 100 99.98 99.4 99.99 99.55 99.43 Structural formulae calculated with 8 oxygens Si 2.708 2.639 2.333 2.781 2.453 2.429 2.314 2.319 2.596 2.37 2.34 2.328 2.39 2.499 2.699 2.703 2.461 2.997 2.776 2.894 2.68 2.779 Al 1.27 1.336 1.635 1.209 1.514 1.53 1.661 1.652 1.379 1.595 1.631 1.643 1.582 1.464 1.28 1.28 1.512 0.972 1.206 1.088 1.294 1.202 Fet 0.021 0.025 0.03 0.017 0.033 0.032 0.03 0.03 0.029 0.034 0.029 0.034 0.033 0.038 0.024 0.026 0.033 0.025 0.026 0.026 0.024 0.02 Mg 0.001 0.001 0.001 0.004 0.007 0.002 0.001 0 0.008 0.001 0.003 0.005 0.005 0.001 0 Ca 0.286 0.365 0.669 0.211 0.551 0.589 0.689 0.691 0.408 0.636 0.663 0.674 0.619 0.499 0.296 0.299 0.538 0.023 0.224 0.109 0.33 0.227 Na 0.687 0.619 0.355 0.715 0.455 0.426 0.314 0.316 0.571 0.386 0.343 0.334 0.374 0.51 0.68 0.644 0.45 0.693 0.691 0.713 0.647 0.722 K 0.056 0.034 0.008 0.074 0.014 0.011 0.007 0.007 0.03 0.01 0.007 0.01 0.012 0.019 0.045 0.052 0.02 0.306 0.087 0.175 0.043 0.061 Sum 5.028 5.019 5.031 5.009 5.025 5.024 5.017 5.016 5.014 5.03 5.02 5.023 5.012 5.034 5.024 5.004 5.018 5.016 5.01 5.006 5.018 5.012 An 27.76 35.86 64.83 21.1 53.98 57.41 68.22 68.14 40.44 61.64 65.46 66.23 61.61 48.57 28.96 30.09 53.36 2.26 22.34 10.91 32.39 22.47 Ab 66.79 60.8 34.36 71.48 44.62 41.5 31.07 31.2 56.57 37.4 33.87 32.79 37.19 49.58 66.65 64.69 44.69 67.83 69.01 71.54 63.43 71.46 Or 5.44 3.34 0.8 7.41 1.39 1.09 0.72 0.66 2.99 0.96 0.67 0.98 1.2 1.85 4.38 5.22 1.95 29.91 8.65 17.55 4.17 6.07 A. Demant "Leg 152, East Greenland margin " Microprobe analyses of pyroxenes "Leg 152, Hole 917A, core 8R-4, 15-20 cm - Aphyric olivine basalt - Unit 6" 266 268 269 270 271 295 296 1 2 3 4 5 6 7 8 9 10 11 12 SiO2 49.92 48.36 48.98 49.47 49.88 49.56 49.7 51.86 49.26 49.9 48.6 48.85 51.1 49.82 49.56 49.9 49.53 49.26 51.1 Al2O3 4.73 2.75 4.5 4.24 3.48 4.71 3.38 2.15 4.22 3.77 3.12 1.9 1.52 3.8 3.65 1.24 4.27 4.23 1.71 FeO 7.66 15.71 8.28 8.19 9.06 7.76 10.28 8 7.62 9.34 13.32 15.9 11.02 8.14 9.62 19.15 7.48 8.08 10.23 MnO 0.18 0.3 0.15 0.13 0.24 0.22 0.18 0.19 0.17 0.21 0.26 0.42 0.29 0.2 0.21 0.62 0.16 0.2 0.3 MgO 14.25 11.97 14.06 14.35 14.36 13.92 13.21 16.53 14.41 14.42 12.54 11.04 14.8 14.26 14.44 11.19 14.23 14.65 14.79 CaO 21.21 17.86 20.92 21.03 20.61 21.3 20.51 20.4 21.76 20.77 19.48 19.19 19.53 21.47 20.98 15.86 21.73 20.89 20.21 Na2O 0.3 0.48 0.3 0.26 0.27 0.29 0.3 0.14 0.22 0.26 0.3 0.32 0.22 0.22 0.24 0.3 0.23 0.23 0.26 TiO2 1.19 1.78 1.21 1.07 1.06 1.29 1.18 0.54 1.03 0.93 1.42 1.43 0.71 0.81 1.05 0.94 0.99 1 0.62 Cr2O3 0.41 0.52 0.24 0.18 0.42 0.05 0.13 0.28 0.11 0.03 0.16 0.09 0.29 0.26 0.05 Total 99.84 99.21 98.93 98.97 99.14 99.46 98.8 99.94 98.96 99.7 99.05 99.07 99.18 98.89 99.83 99.2 98.92 98.79 99.27 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.857 1.871 1.848 1.861 1.879 1.854 1.888 1.921 1.854 1.871 1.868 1.9 1.933 1.877 1.862 1.945 1.863 1.857 1.929 AlIV 0.143 0.125 0.152 0.139 0.121 0.146 0.112 0.079 0.146 0.129 0.132 0.087 0.067 0.123 0.138 0.055 0.137 0.143 0.071 AlVI 0.064 0.048 0.049 0.034 0.061 0.04 0.015 0.042 0.038 0.01 0.001 0.046 0.023 0.002 0.052 0.045 0.005 Fe2+ 0.238 0.508 0.261 0.258 0.285 0.243 0.327 0.248 0.24 0.293 0.428 0.517 0.349 0.257 0.302 0.624 0.235 0.255 0.323 Mn 0.006 0.01 0.005 0.004 0.008 0.007 0.006 0.006 0.005 0.007 0.008 0.014 0.009 0.006 0.007 0.02 0.005 0.006 0.01 Mg 0.79 0.69 0.791 0.805 0.806 0.776 0.748 0.913 0.809 0.806 0.719 0.64 0.834 0.801 0.809 0.65 0.798 0.823 0.832 Ca 0.845 0.74 0.845 0.848 0.832 0.854 0.835 0.81 0.878 0.835 0.802 0.8 0.792 0.867 0.844 0.662 0.876 0.844 0.817 Na 0.022 0.036 0.022 0.019 0.02 0.021 0.022 0.01 0.016 0.019 0.022 0.024 0.016 0.016 0.017 0.023 0.017 0.017 0.019 Ti 0.033 0.052 0.034 0.03 0.03 0.036 0.034 0.015 0.029 0.026 0.041 0.042 0.02 0.023 0.03 0.028 0.028 0.028 0.018 Cr 0.012 0.016 0.007 0.005 0.012 0.002 0.004 0.008 0.003 0.001 0.005 0.003 0.009 0.008 0.001 Sum 4.01 4.032 4.022 4.02 4.02 4.01 4.014 4.021 4.027 4.027 4.03 4.025 4.021 4.021 4.035 4.009 4.02 4.026 4.025 Wo 44.98 37.99 44.45 44.28 43.07 45.42 43.59 40.97 45.44 43.01 40.99 40.58 39.9 44.9 43.04 33.84 45.76 43.76 41.24 En 42.04 35.42 41.56 42.04 41.75 41.29 39.06 46.19 41.86 41.54 36.71 32.48 42.06 41.48 41.21 33.22 41.68 42.69 41.98 Fs 12.98 26.59 13.98 13.68 15.18 13.29 17.36 12.84 12.7 15.44 22.31 26.95 18.04 13.62 15.75 32.94 12.56 13.54 16.78 Fm 0.24 0.43 0.25 0.25 0.27 0.24 0.31 0.22 0.23 0.27 0.38 0.45 0.3 0.25 0.28 0.5 0.23 0.24 0.29 "Leg 152, Hole 917A, core 10R-1, 58-61 cm - Aphyric olivine basalt - Unit 9" 156 157 158 159 160 162 163 164 172 175 183 SiO2 50.58 50.4 52.19 49.65 50.02 49.4 50.62 50.12 49.94 49.85 50.41 Al2O3 2.85 3.97 1.77 4.07 3.94 3.97 4.21 4.19 2.67 3.45 3.6 FeO 11.96 8.07 10.18 8.97 9.18 10.87 6.92 6.7 14.36 10.68 8.62 MnO 0.31 0.15 0.25 0.18 0.19 0.23 0.12 0.17 0.32 0.26 0.22 MgO 14.79 15.17 16.81 14.88 14.98 14.94 15.24 15.62 13.54 14.11 15.45 CaO 17.86 20.66 18.38 20.52 20.15 18.9 21.12 21.22 17.61 19.93 20.27 Na2O 0.31 0.28 0.26 0.3 0.32 0.29 0.26 0.25 0.37 0.35 0.32 TiO2 0.86 0.89 0.56 1.08 1.02 1.09 0.68 0.63 1.4 1.19 0.8 Cr2O3 0.06 0.15 0.09 0.19 0.13 0.06 1.01 1.12 0.05 0.08 Total 99.57 99.74 100.49 99.83 99.93 99.75 100.18 100 100.21 99.87 99.76 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.905 1.876 1.931 1.857 1.867 1.857 1.87 1.857 1.892 1.875 1.879 AlIV 0.095 0.124 0.069 0.143 0.133 0.143 0.13 0.143 0.108 0.125 0.121 AlVI 0.031 0.05 0.008 0.036 0.04 0.033 0.054 0.04 0.011 0.028 0.038 Fe2+ 0.377 0.251 0.315 0.281 0.287 0.342 0.214 0.208 0.455 0.336 0.269 Mn 0.01 0.005 0.008 0.006 0.006 0.007 0.004 0.005 0.01 0.008 0.007 Mg 0.83 0.841 0.927 0.829 0.833 0.837 0.839 0.863 0.764 0.791 0.859 Ca 0.721 0.824 0.729 0.822 0.806 0.761 0.836 0.842 0.715 0.803 0.81 Na 0.023 0.02 0.019 0.022 0.023 0.021 0.019 0.018 0.027 0.026 0.023 Ti 0.024 0.025 0.016 0.03 0.029 0.031 0.019 0.018 0.04 0.034 0.022 Cr 0.002 0.004 0.003 0.006 0.004 0.002 0.03 0.033 0.001 0.002 Sum 4.018 4.02 4.025 4.032 4.028 4.034 4.015 4.027 4.022 4.027 4.03 Wo 37.2 42.88 36.83 42.43 41.71 39.09 44.17 43.92 36.76 41.43 41.65 En 42.85 43.8 46.86 42.8 43.14 42.99 44.34 44.98 39.32 40.81 44.17 Fs 19.95 13.32 16.32 14.77 15.14 17.92 11.49 11.1 23.92 17.76 14.18 Fm 0.32 0.23 0.26 0.26 0.26 0.29 0.21 0.2 0.38 0.3 0.24 "Leg 152, Hole 917A, core 18R3, 98-101 cm - Picrite - Unit 25" 107 108 115 119 133 134 135 147 154 161 162 SiO2 48.96 50.22 49.34 49.1 51.05 49.69 49.59 49.74 49.32 49.96 49.2 Al2O3 2.82 2.43 2.65 2.38 1.16 3.6 3.56 3.32 3.06 3 3.7 FeO 11.95 13.11 11.12 12.75 14.46 9.48 8.67 8.79 9.44 10.08 8.48 MnO 0.13 0.31 0.25 0.32 0.37 0.23 0.14 0.19 0.21 0.24 0.25 MgO 13.3 13.26 14.21 13.5 15.81 14.06 14.51 14.46 14.09 14.45 14.42 CaO 19.1 18.44 19.32 18.58 14.71 19.4 20.48 20.11 20.33 19.48 20.19 Na2O 0.31 0.3 0.28 0.34 0.22 0.32 0.31 0.26 0.34 0.3 0.34 TiO2 1.68 1.63 1.52 1.62 0.8 1.52 1.22 1.27 1.54 1.34 1.58 Cr2O3 0.24 0.03 0.15 0.02 0.21 0.28 0.3 0.18 0.37 Total 98.5 99.73 98.84 98.59 98.59 98.5 98.76 98.43 98.51 98.85 98.51 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.878 1.904 1.88 1.887 1.947 1.882 1.873 1.883 1.876 1.89 1.862 AlIV 0.122 0.096 0.119 0.108 0.052 0.118 0.127 0.117 0.124 0.11 0.138 AlVI 0.006 0.013 0.042 0.031 0.031 0.013 0.024 0.027 Fe2+ 0.383 0.416 0.354 0.41 0.461 0.3 0.274 0.278 0.3 0.319 0.268 Mn 0.004 0.01 0.008 0.01 0.012 0.007 0.004 0.006 0.007 0.008 0.008 Mg 0.76 0.749 0.807 0.773 0.899 0.794 0.817 0.816 0.799 0.815 0.814 Ca 0.785 0.749 0.789 0.765 0.601 0.787 0.829 0.816 0.828 0.79 0.819 Na 0.023 0.022 0.021 0.025 0.016 0.023 0.023 0.019 0.025 0.022 0.025 Ti 0.048 0.046 0.044 0.047 0.023 0.043 0.035 0.036 0.044 0.038 0.045 Cr 0.007 0.001 0.005 0.001 0.006 0.008 0.009 0.005 0.011 Sum 4.016 4.006 4.027 4.026 4.011 4.002 4.021 4.011 4.021 4.016 4.017 Wo 40.61 38.93 40.28 39.06 30.47 41.68 43.08 42.57 42.83 40.89 42.9 En 39.34 38.95 41.21 39.48 45.55 42.03 42.46 42.59 41.3 42.2 42.62 Fs 20.05 22.12 18.51 21.45 23.98 16.29 14.47 14.84 15.87 16.91 14.48 Fm 0.34 0.36 0.31 0.35 0.34 0.28 0.25 0.26 0.28 0.29 0.25 "Leg 152, Hole 917A, core 20R4, 122-127 cm - Picrite - Unit 32B " 293 294 295 297 300 302 303 305 311 312 SiO2 49.56 50.15 51.62 50.42 51.64 48.97 50 49.61 49.34 49.29 Al2O3 3.1 2.59 2.32 2.77 1.77 3.46 3.5 3.97 4.13 4.23 FeOt 10.06 8.9 7.52 7.4 8.24 9.22 8.79 6.93 6.9 6.99 MnO 0.32 0.2 0.18 0.15 0.21 0.22 0.24 0.14 0.15 0.16 MgO 13.86 15.75 16.88 15.81 16.14 14.41 14.43 15.43 14.48 14.93 CaO 20.22 19.41 19.58 20.76 19.97 20.4 20.18 21.43 21.97 21.3 Na2O 0.19 0.32 0.15 0.32 0.2 0.29 0.27 0.23 0.26 0.23 TiO2 1.3 1.46 0.53 0.88 0.64 1.14 1.01 0.74 1.04 0.92 Cr2O3 0.01 0.24 0.29 0.63 0.09 0.54 0.19 0.3 0.31 0.47 Total 98.62 99.01 99.08 99.14 98.9 98.64 98.61 98.78 98.57 98.52 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.885 1.886 1.921 1.888 1.934 1.86 1.888 1.863 1.86 1.857 AlIV 0.115 0.114 0.079 0.112 0.066 0.14 0.112 0.137 0.14 0.143 AlVI 0.024 0.001 0.023 0.01 0.012 0.015 0.044 0.038 0.043 0.045 Fe2+ 0.32 0.28 0.234 0.232 0.258 0.293 0.278 0.218 0.218 0.22 Mn 0.01 0.006 0.006 0.005 0.007 0.007 0.008 0.004 0.005 0.005 Mg 0.786 0.883 0.936 0.882 0.901 0.816 0.812 0.864 0.814 0.838 Ca 0.824 0.782 0.781 0.833 0.801 0.83 0.817 0.862 0.887 0.86 Na 0.014 0.023 0.011 0.023 0.015 0.021 0.02 0.017 0.019 0.017 Ti 0.037 0.041 0.015 0.025 0.018 0.033 0.029 0.021 0.029 0.026 Cr 0 0.007 0.009 0.019 0.003 0.016 0.006 0.009 0.009 0.014 Total 4.015 4.023 4.015 4.029 4.015 4.031 4.014 4.033 4.024 4.025 Wo 42.47 40.08 39.9 42.67 40.74 42.66 42.66 44.26 46.14 44.7 En 40.5 45.25 47.85 45.21 45.8 41.92 42.44 44.34 42.3 43.59 Fs 17.03 14.67 12.25 12.12 13.46 15.41 14.9 11.4 11.56 11.72 Fm 0.3 0.24 0.2 0.21 0.23 0.27 0.26 0.2 0.21 0.21 "Leg 152, Hole 917A, core 23R3, 6-7 cm -Hyaloclastite tuff - Unit 35B " 79 83 84 SiO2 50.78 50.55 50.83 Al2O3 1.84 1.41 1.35 FeO 11.94 12.12 12.1 MnO 0.6 0.57 0.58 MgO 13.96 14.28 14.24 CaO 19.46 19.29 18.97 Na2O 0.36 0.37 0.39 TiO2 0.28 0.18 0.16 Cr2O3 0 0 0.01 Total 99.23 98.77 98.63 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.932 1.934 1.945 AlIV 0.068 0.064 0.055 AlVI 0.014 0 0.005 Fe2+ 0.38 0.388 0.387 Mn 0.019 0.018 0.019 Mg 0.792 0.815 0.812 Ca 0.793 0.791 0.778 Na 0.027 0.027 0.029 Ti 0.008 0.005 0.005 Cr 0 0 0 Sum 4.033 4.042 4.035 Wo 39.98 39.31 38.97 En 39.9 40.49 40.69 Fs 20.12 20.2 20.34 Fm 0.34 0.33 0.33 "Leg 152, Hole 917A, core 40R4, 78-81 cm - Aphyric basalt - Unit 52" 48 49 52 62 63 64 65 66 67 72 73 74 75 77 50 51 61 69 70 71 76 79 SiO2 51.05 50.75 50.11 50.78 50.65 50.65 51.21 50.8 50.64 50.96 50.91 51.38 50.65 50.45 50.67 51.32 51.3 50.67 51.28 51.09 51.1 50.96 Al2O3 1.78 1.61 1.66 1.71 1.8 1.75 1.5 1.54 1.31 2 1.98 1.45 1.69 1.69 0.47 0.7 0.81 0.52 0.82 0.85 0.64 0.89 FeO 11.56 12.52 14.21 14.6 12.05 12.14 12.34 14.31 14.63 11.65 10.31 13.02 12.93 13.64 26.09 22.25 22.36 25.34 21.96 21.94 22.8 21.82 MnO 0.27 0.28 0.31 0.33 0.29 0.25 0.29 0.33 0.29 0.22 0.21 0.29 0.24 0.31 0.46 0.51 0.54 0.57 0.45 0.53 0.5 0.44 MgO 15.2 14.87 13.44 13.66 14.2 14.35 15.15 13.66 13.96 14.53 14.72 14.82 14.54 14.37 16.63 19.55 18.86 16.82 17.79 19.47 18.68 19.41 CaO 18.86 17.89 17.94 17.96 19.11 19.47 18.26 17.77 17.13 18.92 19.86 17.61 17.79 17.32 4.3 4.59 5.12 4.76 5.99 4.52 4.45 4.77 Na2O 0.25 0.31 0.28 0.34 0.27 0.29 0.29 0.28 0.25 0.28 0.29 0.26 0.27 0.23 0.09 0.1 0.08 0.1 0.11 0.11 0.06 0.09 TiO2 0.57 0.63 0.6 0.62 0.53 0.51 0.47 0.5 0.72 0.53 0.5 0.5 0.67 0.67 0.32 0.35 0.45 0.33 0.47 0.43 0.34 0.38 Cr2O3 0.03 0.01 0 0.01 0.07 0.02 0.05 0.01 0.01 0.05 Total 99.53 98.89 98.55 100.01 98.91 99.41 99.49 99.26 98.93 99.1 98.81 99.32 98.78 98.72 99.04 99.36 99.53 99.11 98.86 98.95 98.58 98.8 Structural formulae calculated with 6 oxygenes and FeO as FeOt formulae calculated with 6 oxygenes and FeO as FeOt Si 1.925 1.931 1.931 1.929 1.929 1.923 1.935 1.94 1.941 1.93 1.928 1.946 1.932 1.93 1.97 1.954 1.954 1.965 1.966 1.951 1.965 1.949 AlIV 0.075 0.069 0.069 0.071 0.071 0.077 0.065 0.06 0.059 0.07 0.072 0.054 0.068 0.07 0.022 0.031 0.037 0.024 0.034 0.038 0.029 0.04 AlVI 0.004 0.004 0.006 0.006 0.01 0.001 0.002 0.01 0.02 0.017 0.011 0.008 0.006 0.003 Fe2+ 0.364 0.399 0.458 0.464 0.384 0.385 0.39 0.457 0.469 0.369 0.327 0.412 0.413 0.436 0.848 0.708 0.712 0.822 0.704 0.701 0.733 0.698 Mn 0.008 0.009 0.01 0.01 0.009 0.008 0.009 0.011 0.009 0.007 0.007 0.009 0.008 0.01 0.015 0.016 0.017 0.019 0.014 0.017 0.016 0.014 Mg 0.854 0.843 0.772 0.773 0.806 0.812 0.853 0.777 0.797 0.821 0.831 0.836 0.826 0.819 0.963 1.11 1.07 0.972 1.017 1.108 1.071 1.107 Ca 0.762 0.729 0.741 0.731 0.78 0.792 0.739 0.727 0.703 0.768 0.806 0.715 0.727 0.71 0.179 0.187 0.209 0.198 0.246 0.185 0.184 0.195 Na 0.018 0.023 0.021 0.025 0.02 0.022 0.021 0.021 0.019 0.02 0.021 0.019 0.02 0.017 0.007 0.007 0.006 0.008 0.008 0.008 0.005 0.007 Ti 0.016 0.018 0.017 0.018 0.015 0.014 0.013 0.014 0.021 0.015 0.014 0.014 0.019 0.019 0.009 0.01 0.013 0.01 0.013 0.012 0.01 0.011 Cr 0.001 0.002 0.001 0.001 0.001 Sum 4.026 4.026 4.025 4.027 4.024 4.034 4.027 4.019 4.018 4.02 4.024 4.016 4.021 4.018 4.013 4.023 4.018 4.018 4.005 4.02 4.013 4.022 Wo 38.3 36.83 37.41 36.94 39.41 39.65 37.12 36.87 35.54 39.09 40.91 36.23 36.84 35.94 8.94 9.25 10.41 9.84 12.41 9.19 9.16 9.7 En 42.95 42.58 38.97 39.09 40.73 40.66 42.85 39.41 40.29 41.77 42.17 42.4 41.87 41.47 48.03 54.89 53.29 48.35 51.32 55.11 53.44 54.94 Fs 18.75 20.59 23.62 23.97 19.86 19.69 20.04 23.71 24.17 19.14 16.93 21.38 21.3 22.58 43.03 35.85 36.31 41.81 36.27 35.7 37.41 35.36 Fm 0.3 0.33 0.38 0.38 0.33 0.33 0.32 0.38 0.37 0.31 0.29 0.34 0.34 0.35 0.47 0.4 0.41 0.46 0.41 0.39 0.41 0.39 "Leg 152, Hole 917A, core 47R2, 38-42 cm - Dacite - Unit 54" 267 269 270 271 272 275 277 278 279 281 282 283 284 SiO2 51.11 51.67 51 51.75 51.61 49.94 49.74 49.95 50.66 52.03 51.28 50.96 51.94 Al2O3 3.26 3.03 3.2 2.9 3.38 5.1 5.18 4.57 4.05 2.38 3.67 4.04 2.34 FeO 6.29 7.21 6.9 6.91 6.26 6.47 6.23 6.41 7.04 7.26 6.3 7.12 6.23 MnO 0.19 0.23 0.22 0.19 0.15 0.14 0.12 0.13 0.26 0.15 0.11 0.13 0.19 MgO 16.21 16.74 16.52 16.88 16.62 15.85 15.38 15.8 16.15 17.53 16.29 16.26 16.69 CaO 20.79 18.91 20.21 19.52 20.39 19.88 20.28 20.07 19.56 19.06 20.73 19.33 20.13 Na2O 0.24 0.26 0.29 0.25 0.24 0.33 0.31 0.32 0.31 0.21 0.29 0.3 0.2 TiO2 0.42 0.37 0.43 0.39 0.29 0.54 0.62 0.58 0.57 0.35 0.4 0.48 0.35 Cr2O3 0.58 0.14 0.48 0.37 0.48 0.77 0.81 0.83 0.53 0.19 0.62 0.17 0.44 Total 99.1 98.56 99.24 99.15 99.42 99.01 98.67 98.66 99.13 99.16 99.69 98.78 98.51 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.9 1.924 1.896 1.918 1.907 1.857 1.856 1.865 1.883 1.927 1.893 1.896 1.935 AlIV 0.1 0.076 0.104 0.082 0.093 0.143 0.144 0.135 0.117 0.073 0.107 0.104 0.065 AlVI 0.043 0.057 0.036 0.044 0.054 0.08 0.084 0.066 0.061 0.031 0.053 0.073 0.037 Fe2+ 0.196 0.225 0.215 0.214 0.193 0.201 0.194 0.2 0.219 0.225 0.195 0.222 0.194 Mn 0.006 0.007 0.007 0.006 0.005 0.004 0.004 0.004 0.008 0.005 0.003 0.004 0.006 Mg 0.898 0.929 0.915 0.932 0.915 0.878 0.855 0.879 0.895 0.968 0.896 0.902 0.927 Ca 0.828 0.755 0.805 0.775 0.807 0.792 0.811 0.803 0.779 0.756 0.82 0.77 0.803 Na 0.017 0.019 0.021 0.018 0.017 0.024 0.022 0.023 0.022 0.015 0.021 0.022 0.014 Ti 0.012 0.01 0.012 0.011 0.008 0.015 0.017 0.016 0.016 0.01 0.011 0.013 0.01 Cr 0.017 0.004 0.014 0.011 0.014 0.023 0.024 0.025 0.016 0.006 0.018 0.005 0.013 Sum 4.017 4.006 4.025 4.011 4.013 4.017 4.011 4.016 4.016 4.016 4.017 4.011 4.004 Wo 42.95 39.39 41.46 40.21 42.03 42.22 43.49 42.56 40.98 38.71 42.83 40.6 41.62 En 46.59 48.51 47.14 48.37 47.66 46.82 45.88 46.61 47.07 49.53 46.83 47.51 48.01 Fs 10.45 12.1 11.4 11.42 10.32 10.96 10.63 10.83 11.94 11.75 10.34 11.89 10.37 Fm 0.18 0.2 0.19 0.19 0.18 0.19 0.19 0.19 0.2 0.19 0.18 0.2 0.18 "Leg 152, Hole 917A, core 53R1, 15-18 cm - Ash flow tuff - Unit 56" 117 118 SiO2 49.83 50.12 TiO2 0.34 0.39 Al2O3 2.27 2.45 FeO 13.03 12.96 MnO 0.33 0.19 MgO 13.94 13.48 CaO 18.63 18.62 Na2O 0.53 0.53 Cr2O3 0.02 0 Total 98.92 98.73 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.909 1.919 AlIV 0.091 0.081 AlVI 0.011 0.029 Fe2+ 0.417 0.415 Mn 0.011 0.006 Mg 0.796 0.769 Ca 0.765 0.764 Na 0.039 0.039 Ti 0.01 0.011 Cr 0.001 0 Sum 4.05 4.033 Wo 38.45 39.09 En 40.02 39.36 Fs 21.53 21.55 Fm 0.35 0.35 "Leg 152, Hole 917A, core 55R4, 98-101 cm - Olivine-plagioclase-pyroxene-phyric basalt- Unit 60" 89 90 93 95 96 99 119 SiO2 49.85 50.49 49.54 49.68 47.96 51.56 50.55 Al2O3 3.87 3.48 2.88 3.17 5.37 1.84 2.94 FeOt 5.89 5.47 9.96 9.29 7.73 7.35 7.13 MnO 0.17 0.13 0.22 0.21 0.19 0.12 0.18 MgO 15.36 15.6 14.56 14.81 14.86 16.91 15.2 CaO 22.22 22.46 20.25 20.16 20.91 20.04 21.49 Na2O 0.31 0.3 0.35 0.31 0.32 0.21 0.28 TiO2 0.3 0.27 0.58 0.54 0.84 0.25 0.41 Cr2O3 1.16 1.04 0.13 0.3 0.7 0.21 0.4 Total 99.13 99.24 98.47 98.47 98.88 98.49 98.58 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.864 1.881 1.888 1.886 1.81 1.932 1.902 AlIV 0.136 0.119 0.112 0.114 0.19 0.068 0.098 AlVI 0.035 0.034 0.017 0.028 0.049 0.013 0.032 Fe2+ 0.184 0.17 0.317 0.295 0.244 0.23 0.224 Mn 0.005 0.004 0.007 0.007 0.006 0.004 0.006 Mg 0.856 0.866 0.827 0.838 0.836 0.944 0.853 Ca 0.89 0.896 0.827 0.82 0.845 0.805 0.866 Na 0.022 0.022 0.026 0.023 0.023 0.015 0.02 Ti 0.008 0.008 0.017 0.015 0.024 0.007 0.012 Cr 0.034 0.031 0.004 0.009 0.021 0.006 0.012 Sum 4.034 4.031 4.042 4.035 4.048 4.024 4.025 Wo 45.99 46.28 41.79 41.84 43.78 40.57 44.45 En 44.22 44.71 41.8 42.76 43.28 47.62 43.74 Fs 9.79 9.01 16.4 15.39 12.95 11.81 11.81 Fm 0.18 0.16 0.28 0.26 0.23 0.2 0.21 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 115 116 117 118 129 123 124 228 SiO2 50.17 50.41 50.27 50.16 50.29 49.54 49.9 50.38 Al2O3 2.76 2.85 3.27 3.54 1.87 4.37 2.88 3.19 FeO 9.97 9.22 8.95 9.63 13.52 7.35 11.21 7.75 MnO 0.2 0.21 0.21 0.23 0.3 0.14 0.28 0.18 MgO 13.55 13.87 14.07 14.23 12.92 14.1 13.71 15.05 CaO 20.37 20.51 20.56 19.5 17.96 21.06 19.06 20.67 Na2O 0.37 0.3 0.29 0.27 0.36 0.34 0.32 0.27 TiO2 1.3 1.2 1.15 1.31 1.27 1.28 1.52 0.8 Cr2O3 0.06 0.09 0.18 0.11 0.6 0.04 0.22 Total 98.75 98.66 98.95 98.98 98.48 98.78 98.9 98.51 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.904 1.907 1.895 1.889 1.932 1.862 1.895 1.897 AlIV 0.096 0.093 0.105 0.111 0.068 0.138 0.105 0.103 AlVI 0.027 0.034 0.04 0.047 0.016 0.056 0.024 0.039 Fe2+ 0.316 0.292 0.282 0.303 0.434 0.231 0.356 0.244 Mn 0.006 0.007 0.007 0.007 0.01 0.004 0.009 0.006 Mg 0.766 0.782 0.79 0.799 0.74 0.79 0.776 0.845 Ca 0.828 0.831 0.83 0.787 0.739 0.848 0.775 0.834 Na 0.027 0.022 0.021 0.02 0.027 0.025 0.024 0.02 Ti 0.037 0.034 0.033 0.037 0.037 0.036 0.043 0.023 Cr 0.002 0.003 0.005 0.003 0.018 0.001 0.007 Sum 4.009 4.005 4.008 4.003 4.003 4.008 4.008 4.018 Wo 43.19 43.48 43.48 41.49 38.44 45.27 40.46 43.24 En 39.97 40.91 41.39 42.12 38.47 42.16 40.49 43.81 Fs 16.84 15.61 15.12 16.38 23.09 12.57 19.05 12.95 Fm 0.3 0.28 0.27 0.28 0.38 0.23 0.32 0.23 "Leg 152, Hole 917A, core 67R-3, 130-132 cm - Olivine-plagioclase-pyroxene-phyric basalt - Unit 70" 127 164 SiO2 50.18 50.15 Al2O3 2.96 1.79 FeOt 6.41 9.76 MnO 0.19 0.25 MgO 15.43 14.43 CaO 21.5 19.22 Na2O 0.3 0.31 TiO2 0.41 0.37 Cr2O3 2.35 2.73 Total 99.72 99.02 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.872 1.904 AlIV 0.128 0.08 AlVI 0.002 Fe2+ 0.2 0.31 Mn 0.006 0.008 Mg 0.858 0.817 Ca 0.859 0.782 Na 0.022 0.023 Ti 0.011 0.01 Cr 0.069 0.082 Sum 4.027 4.016 Wo 44.69 40.8 En 44.61 42.61 Fs 10.7 16.6 Fm 0.19 0.28 "Leg 152, Hole 917A, core 72R-1, 82-85 cm - Olivine-phyric basalt - Unit 73A " 7 8 9 11 12 13 14 15 19 20 21 SiO2 52.08 50.56 49.19 52.02 49.77 49.9 50.27 50.73 50.11 51.29 47.53 Al2O3 1.73 3.45 3.72 1.89 4.3 3.38 3.19 1.42 3.76 2 1.92 FeO 8.33 7.76 9.98 7 6.79 8.29 8.06 14.59 6.98 9.72 22.27 MnO 0.22 0.13 0.22 0.15 0.11 0.23 0.21 0.36 0.14 0.24 0.57 MgO 16.93 15.3 15.14 17.07 15.09 15.06 15.63 14.81 15.42 15.82 7.94 CaO 19.27 20.47 19.25 19.78 21.15 20.92 20.88 16.71 20.92 19.18 17.76 Na2O 0.19 0.24 0.3 0.21 0.28 0.29 0.26 0.29 0.25 0.19 0.3 TiO2 0.34 0.56 0.87 0.3 0.63 0.61 0.55 0.49 0.54 0.46 0.8 Cr2O3 0.13 0.22 0.11 0.24 0.88 0.14 0.13 0 0.75 0.09 0 Total 99.23 98.71 98.76 98.65 98.98 98.81 99.17 99.4 98.87 98.98 99.09 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.94 1.897 1.863 1.939 1.863 1.881 1.885 1.933 1.877 1.929 1.902 AlIV 0.06 0.103 0.137 0.061 0.137 0.119 0.115 0.064 0.123 0.071 0.091 AlVI 0.016 0.05 0.029 0.022 0.052 0.032 0.026 0 0.043 0.017 0 Fe2+ 0.259 0.244 0.316 0.218 0.213 0.261 0.253 0.465 0.219 0.306 0.745 Mn 0.007 0.004 0.007 0.005 0.003 0.007 0.007 0.012 0.004 0.008 0.019 Mg 0.94 0.856 0.855 0.949 0.842 0.846 0.874 0.841 0.861 0.887 0.474 Ca 0.769 0.823 0.781 0.79 0.848 0.845 0.839 0.682 0.84 0.773 0.762 Na 0.014 0.017 0.022 0.015 0.02 0.021 0.019 0.021 0.018 0.014 0.023 Ti 0.01 0.016 0.025 0.008 0.018 0.017 0.016 0.014 0.015 0.013 0.024 Cr 0.004 0.007 0.003 0.007 0.026 0.004 0.004 0 0.022 0.003 0 Sum 4.019 4.017 4.038 4.014 4.022 4.033 4.038 4.032 4.022 4.021 4.04 Wo 38.93 42.72 39.87 40.28 44.5 43.11 42.54 34.11 43.65 39.17 38.08 En 47.58 44.42 43.63 48.36 44.17 43.18 44.3 42.06 44.76 44.95 23.68 Fs 13.49 12.86 16.5 11.37 11.33 13.71 13.16 23.83 11.6 15.88 38.24 Fm 0.22 0.22 0.27 0.19 0.2 0.24 0.23 0.36 0.21 0.26 0.62 "Leg 152, Hole 917A, core 79R-2, 64-67 cm - Olivine-phyric basalt - Unit 78" 1 2 3 4 5 6 7 8 9 10 11 12 14 15 137 141 143 SiO2 49.85 49.38 50.56 50.16 50 49.54 50.61 49.67 50.36 49.71 49.91 49.97 50 50.73 49.62 49.76 50.18 Al2O3 4.08 4.08 3.68 2.42 2.44 3.89 2.81 3.63 3.04 4.32 2.91 2.52 4.05 3 4.36 3.02 3.17 FeO 7.97 8.68 8.29 12.16 12.32 8.63 10.39 8.84 9.72 7.49 11.53 11.91 7.07 6.87 6.95 10.04 10.69 MnO 0.16 0.24 0.16 0.02 0.35 0.22 0.21 0.16 0.28 0.16 0.27 0.26 0.14 0.14 0.17 0.26 0.29 MgO 15.14 14 14.53 14 14.07 14.38 14.25 14.39 14.56 14.31 14.39 13.84 14.91 14.88 15.13 14.71 14.55 CaO 20.61 21.19 21.22 19.37 19.12 20.73 19.81 20.53 19.64 20.96 18.55 19.04 20.97 21.93 20.69 19.88 19.24 Na2O 0.25 0.3 0.32 0.3 0.32 0.3 0.29 0.3 0.32 0.31 0.32 0.29 0.27 0.23 0.32 0.32 0.3 TiO2 0.86 0.98 0.73 0.74 0.71 0.8 0.56 0.85 0.68 0.84 0.74 0.82 0.76 0.54 0.77 0.69 0.71 Cr2O3 0.25 0.23 0.08 0 0.01 0.25 0.04 0.17 0.15 0.43 0.1 0.38 0.23 0.85 0.07 0.07 Total 99.17 99.08 99.58 99.17 99.32 98.73 98.98 98.54 98.75 98.53 98.72 98.66 98.54 98.55 98.85 98.73 99.2 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.867 1.863 1.889 1.907 1.902 1.872 1.914 1.88 1.904 1.872 1.899 1.908 1.878 1.907 1.86 1.888 1.895 AlIV 0.133 0.137 0.111 0.093 0.098 0.128 0.086 0.12 0.096 0.128 0.101 0.092 0.122 0.093 0.14 0.112 0.105 AlVI 0.047 0.044 0.051 0.016 0.011 0.045 0.039 0.042 0.039 0.064 0.029 0.022 0.057 0.04 0.052 0.023 0.036 Fe2+ 0.25 0.274 0.259 0.387 0.392 0.273 0.329 0.28 0.307 0.236 0.367 0.38 0.222 0.216 0.218 0.319 0.338 Mn 0.005 0.008 0.005 0.001 0.011 0.007 0.007 0.005 0.009 0.005 0.009 0.008 0.004 0.004 0.005 0.008 0.009 Mg 0.845 0.787 0.809 0.793 0.798 0.81 0.803 0.812 0.82 0.803 0.816 0.788 0.835 0.834 0.845 0.832 0.819 Ca 0.827 0.857 0.849 0.789 0.779 0.839 0.803 0.833 0.795 0.846 0.756 0.779 0.844 0.883 0.831 0.808 0.778 Na 0.018 0.022 0.023 0.022 0.024 0.022 0.021 0.022 0.023 0.023 0.024 0.021 0.02 0.017 0.023 0.024 0.022 Ti 0.024 0.028 0.021 0.021 0.02 0.023 0.016 0.024 0.019 0.024 0.021 0.024 0.021 0.015 0.022 0.02 0.02 Cr 0.007 0.007 0.002 0.007 0.001 0.005 0.004 0.013 0.003 0.011 0.007 0.025 0.002 0.002 Sum 4.023 4.027 4.019 4.029 4.035 4.026 4.019 4.023 4.016 4.014 4.025 4.022 4.014 4.016 4.021 4.036 4.024 Wo 42.92 44.49 44.18 40.06 39.35 43.51 41.35 43.15 41.17 44.75 38.82 39.84 44.3 45.59 43.74 41.09 40.04 En 43.86 40.89 42.08 40.28 40.29 41.99 41.38 42.08 42.46 42.5 41.9 40.28 43.81 43.03 44.5 42.29 42.12 Fs 13.22 14.62 13.74 19.66 20.36 14.5 17.27 14.77 16.37 12.75 19.28 19.88 11.89 11.38 11.75 16.62 17.84 Fm 0.23 0.26 0.25 0.33 0.34 0.26 0.29 0.26 0.28 0.23 0.32 0.33 0.21 0.21 0.21 0.28 0.3 "Leg 152, Hole 917A, core 88R-7, 83-86 cm - Aphyric olivine basalt - Unit 84" 1 2 3 4 11 12 13 16 17 18 36 41 44 58 89 35 40 SiO2 51.26 52.19 52.26 52.16 51.35 51.26 51.32 51.36 52.35 51.39 50.91 52.68 51.03 51.92 51.64 52.19 52.49 Al2O3 2.27 1.49 1.47 1.57 2.3 2.09 2.03 2.7 1.77 2.77 1.78 1.53 1.64 1.97 1.77 0.77 0.65 FeOt 8.57 8.39 8.54 8.69 8.31 9.49 10.14 6.07 6.44 6.08 10.85 7.1 11.8 7.39 8.99 18.77 19.56 MnO 0.22 0.3 0.28 0.33 0.11 0.4 0.06 0.49 0.35 0.09 0.19 0.49 0.31 0.18 0.28 0.46 0.48 MgO 15.92 16.18 16.05 16.28 15.84 16.04 15.47 15.9 16.77 16.09 15.27 17.01 15.7 16.45 15.52 21.8 20.52 CaO 19.58 19.71 19.66 19.52 19.84 18.8 18.52 20.75 20.64 21.04 18.67 20.29 17.45 20.18 19.61 4.45 4.66 Na2O 0.29 0.24 0.31 0.3 0.3 0.36 0.3 0.24 0.27 0.23 0.4 0.18 0.37 0.27 0.33 0.07 0.22 TiO2 0.75 0.57 0.62 0.66 0.78 0.82 1.05 0.55 0.38 0.55 1.2 0.46 1.08 0.51 0.83 0.62 0.52 Cr2O3 0.1 0.01 0 0.01 0.12 0.48 0.42 0.56 0.3 0.08 0.29 Total 98.95 99.06 99.19 99.52 98.82 99.26 99.01 98.54 99.39 98.78 99.27 100.04 99.37 98.94 99.26 99.12 99.1 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.921 1.95 1.951 1.943 1.924 1.921 1.928 1.919 1.939 1.914 1.919 1.942 1.924 1.936 1.934 1.956 1.975 AlIV 0.079 0.05 0.049 0.057 0.076 0.079 0.072 0.081 0.061 0.086 0.079 0.058 0.073 0.064 0.066 0.034 0.025 AlVI 0.021 0.015 0.016 0.011 0.025 0.013 0.018 0.038 0.017 0.036 0.009 0.022 0.012 0.004 Fe2+ 0.269 0.262 0.267 0.271 0.26 0.297 0.319 0.19 0.2 0.189 0.342 0.219 0.372 0.23 0.282 0.588 0.615 Mn 0.007 0.009 0.009 0.01 0.003 0.013 0.002 0.016 0.011 0.003 0.006 0.015 0.01 0.006 0.009 0.015 0.015 Mg 0.889 0.901 0.893 0.904 0.885 0.896 0.866 0.886 0.926 0.893 0.858 0.935 0.882 0.914 0.866 1.218 1.151 Ca 0.786 0.789 0.786 0.779 0.796 0.755 0.746 0.831 0.819 0.84 0.754 0.802 0.705 0.806 0.787 0.179 0.188 Na 0.021 0.017 0.022 0.022 0.022 0.026 0.022 0.017 0.019 0.017 0.029 0.013 0.027 0.02 0.024 0.005 0.016 Ti 0.021 0.016 0.017 0.018 0.022 0.023 0.03 0.015 0.011 0.015 0.034 0.013 0.031 0.014 0.023 0.017 0.015 Cr 0.003 0.004 0.014 0.012 0.016 0.009 0.002 0.009 Sum 4.017 4.009 4.01 4.015 4.013 4.023 4.007 4.007 4.015 4.009 4.021 4.015 4.024 4.014 4.012 4.012 4.004 Wo 40.3 40.22 40.22 39.67 40.95 38.49 38.58 43.23 41.89 43.61 38.47 40.68 35.8 41.2 40.48 8.94 9.54 En 45.58 45.93 45.68 46.02 45.48 45.69 44.83 46.09 47.35 46.4 43.77 47.44 44.81 46.73 44.57 60.91 58.43 Fs 14.12 13.85 14.09 14.31 13.57 15.81 16.59 10.68 10.76 9.99 17.76 11.89 19.4 12.07 14.94 30.15 32.03 Fm 0.24 0.23 0.24 0.24 0.23 0.26 0.27 0.19 0.19 0.18 0.29 0.2 0.3 0.21 0.25 0.33 0.35 "Leg 152, Hole 917A, core 90R-1, 58-59 cm - Olivine-plagioclase-phyric basalt - Unit 85" 69 70 71 75 77 79 80 81 82 SiO2 50.74 52.24 51.57 52.48 50.84 51.06 52.15 50.38 50.92 Al2O3 2.83 1.85 1.36 1.57 2.84 2.97 1.49 3.01 3.32 FeO 6.91 5.95 11.08 6.9 7.17 7.08 7.73 7.97 5.84 MnO 0.13 0.1 0.27 0.24 0.18 0.1 0.19 0.19 0.16 MgO 16.01 17.23 15.89 17 15.93 15.81 17.02 15.38 16.15 CaO 21.24 20.9 18.53 20.42 21.42 21.29 20.07 21.12 21.62 Na2O 0.24 0.22 0.19 0.21 0.22 0.29 0.22 0.26 0.28 TiO2 0.34 0.17 0.35 0.21 0.32 0.33 0.21 0.48 0.29 Cr2O3 0.29 0.62 0.04 0.26 0.15 0.34 0.1 0.19 0.95 Total 98.73 99.28 99.27 99.29 99.07 99.27 99.17 98.96 99.55 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.902 1.934 1.942 1.947 1.902 1.904 1.943 1.893 1.888 AlIV 0.098 0.066 0.058 0.053 0.098 0.096 0.057 0.107 0.112 AlVI 0.027 0.014 0.002 0.015 0.027 0.034 0.008 0.027 0.033 Fe2+ 0.217 0.184 0.349 0.214 0.224 0.221 0.241 0.25 0.181 Mn 0.004 0.003 0.009 0.008 0.006 0.003 0.006 0.006 0.005 Mg 0.894 0.951 0.892 0.94 0.888 0.879 0.945 0.861 0.893 Ca 0.853 0.829 0.748 0.812 0.858 0.85 0.801 0.85 0.859 Na 0.017 0.016 0.014 0.015 0.016 0.021 0.016 0.019 0.02 Ti 0.01 0.005 0.01 0.006 0.009 0.009 0.006 0.014 0.008 Cr 0.009 0.018 0.001 0.008 0.004 0.01 0.003 0.006 0.028 Sum 4.031 4.02 4.025 4.018 4.032 4.027 4.026 4.033 4.027 Wo 43.34 42.14 37.44 41.13 43.43 43.55 40.2 43.2 44.33 En 45.45 48.33 44.66 47.64 44.93 44.99 47.42 43.77 46.07 Fs 11.21 9.52 17.9 11.23 11.64 11.47 12.38 13.03 9.61 Fm 0.2 0.16 0.29 0.19 0.21 0.2 0.21 0.23 0.17 "Leg 152, Hole 917A, core 94R-1, 71-74 cm - Aphyric olivine basalt - Unit 87" 108 109 110 113 137 138 139 140 141 142 143 145 147 148 149 SiO2 52.15 50.71 50.68 49.68 50.3 50.5 51 51 50.55 50.32 52.08 50.59 52.37 50.6 50.24 Al2O3 2 3.4 3.11 2.45 2.45 2.46 3.12 2.66 3.05 1.87 2.01 3.28 2.02 2.78 2.5 FeOt 6.19 6.12 6.72 10.79 9.74 9.41 6.84 7.37 8.09 11 6.62 6.01 6.46 7.8 9.48 MnO 0.14 0.11 0.15 0.36 0.23 0.21 0.15 0.37 0.16 0.27 0.16 0.2 0.16 0.08 0.24 MgO 16.61 15.56 15.37 14.64 14.79 15.14 15.7 15.7 15.69 14.98 16.93 15.68 16.44 15.34 14.89 CaO 20.56 21.19 21.07 19.32 20 19.97 21.09 20.82 20.04 19.29 20.48 21.35 20.72 20.66 20.17 Na2O 0.25 0.3 0.29 0.39 0.44 0.37 0.34 0.12 0.36 0.44 0.3 0.26 0.31 0.34 0.42 TiO2 0.31 0.45 0.53 1.34 0.87 0.79 0.49 0.58 0.61 0.96 0.37 0.51 0.33 0.66 0.99 Cr2O3 0.61 1.26 0.85 0.03 0.1 0.79 0.42 0.37 0.56 1.13 0.6 0.33 Total 98.82 99.1 98.77 98.96 98.86 98.95 99.51 99.06 98.91 99.12 99.5 98.99 99.41 98.58 98.91 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.939 1.89 1.898 1.887 1.904 1.905 1.896 1.908 1.896 1.908 1.928 1.888 1.939 1.904 1.899 AlIV 0.061 0.11 0.102 0.11 0.096 0.095 0.104 0.092 0.104 0.084 0.072 0.112 0.061 0.096 0.101 AlVI 0.027 0.039 0.036 0.013 0.015 0.033 0.025 0.031 0.016 0.032 0.027 0.028 0.01 Fe2+ 0.193 0.191 0.211 0.343 0.308 0.297 0.213 0.231 0.254 0.349 0.205 0.188 0.2 0.246 0.3 Mn 0.004 0.003 0.005 0.012 0.007 0.007 0.005 0.012 0.005 0.009 0.005 0.006 0.005 0.003 0.008 Mg 0.921 0.864 0.858 0.829 0.834 0.851 0.87 0.876 0.877 0.847 0.934 0.872 0.907 0.861 0.839 Ca 0.819 0.846 0.846 0.786 0.811 0.807 0.84 0.835 0.805 0.784 0.812 0.854 0.822 0.833 0.817 Na 0.018 0.022 0.021 0.029 0.032 0.027 0.025 0.009 0.026 0.032 0.022 0.019 0.022 0.025 0.031 Ti 0.009 0.013 0.015 0.038 0.025 0.022 0.014 0.016 0.017 0.027 0.01 0.014 0.009 0.019 0.028 Cr 0.018 0.037 0.025 0.001 0.003 0.023 0.012 0.011 0.016 0.033 0.018 0.01 Sum 4.009 4.015 4.017 4.034 4.031 4.029 4.023 4.016 4.026 4.04 4.02 4.018 4.01 4.025 4.033 Wo 42.3 44.42 44.06 39.92 41.36 41.14 43.58 42.75 41.48 39.42 41.52 44.47 42.49 42.91 41.61 En 47.54 45.38 44.72 42.09 42.55 43.39 45.14 44.84 45.18 42.59 47.75 45.43 46.91 44.32 42.73 Fs 10.17 10.2 11.22 17.99 16.1 15.47 11.28 12.41 13.33 17.98 10.73 10.1 10.6 12.78 15.66 Fm 0.18 0.18 0.2 0.3 0.27 0.26 0.2 0.22 0.23 0.3 0.18 0.18 0.18 0.22 0.27 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 208 209 215 232 233 244 247 249 242 250 SiO2 50.88 50.68 51.42 50.75 50.68 51.15 51.75 51.49 52.4 52.24 Al2O3 3.26 3.64 2.18 3.12 2.88 2.14 1.95 1.18 0.18 0.08 FeOt 6.25 6.33 6.24 6.65 7.42 8.32 6.57 11.35 23.16 24.58 MnO 0.09 0.11 0.13 0.16 0.15 0.2 0.39 0.32 0.32 0.51 MgO 15.65 15.75 16.49 15.76 16.02 15.43 16.22 16.23 21.67 20 CaO 21.03 20.31 20.86 20.71 20.04 20.31 20.81 16.82 1.07 1.21 Na2O 0.31 0.35 0.25 0.36 0.34 0.35 0.32 0.31 0.14 0.09 TiO2 0.48 0.44 0.35 0.44 0.56 0.58 0.32 0.61 0.18 0.18 Cr2O3 0.84 1.17 0.6 0.79 0.4 0.03 0.39 0.55 0.04 Total 98.79 98.79 98.53 98.75 98.49 98.52 98.7 98.86 99.13 98.93 Structural formulae calculated with 6 oxygenes and FeO as FeOt Si 1.9 1.891 1.923 1.899 1.903 1.928 1.935 1.944 1.982 1.995 AlIV 0.1 0.109 0.077 0.101 0.097 0.072 0.065 0.053 0.008 0.004 AlVI 0.043 0.051 0.019 0.037 0.031 0.023 0.02 Fe2+ 0.195 0.198 0.195 0.208 0.233 0.262 0.205 0.358 0.733 0.785 Mn 0.003 0.003 0.004 0.005 0.005 0.006 0.012 0.01 0.01 0.016 Mg 0.871 0.876 0.919 0.879 0.897 0.867 0.904 0.913 1.222 1.138 Ca 0.841 0.812 0.836 0.83 0.806 0.82 0.834 0.68 0.043 0.05 Na 0.022 0.025 0.018 0.026 0.025 0.026 0.023 0.023 0.01 0.007 Ti 0.013 0.012 0.01 0.012 0.016 0.016 0.009 0.017 0.005 0.005 Cr 0.025 0.035 0.018 0.023 0.012 0.001 0.012 0.016 0.001 Sum 4.013 4.012 4.019 4.02 4.025 4.021 4.019 4.014 4.013 4.001 Wo 44.04 42.99 42.77 43.19 41.55 41.94 42.63 34.67 2.16 2.49 En 45.59 46.37 47.03 45.72 46.2 44.32 46.23 46.54 60.84 57.22 Fs 10.37 10.64 10.2 11.09 12.25 13.74 11.14 18.78 37 40.29 Fm 0.19 0.19 0.18 0.2 0.21 0.24 0.19 0.29 0.38 0.41 A. Demant "Leg 152, East Greenland Margin" Microprobe analyses of titanomagnetites "Leg 152, Hole 917A, core 10R-1, 58-61 cm - Aphyric olivine basalt - Unit 9" 173 174 184 192 SiO2 0.32 0.26 0.29 0.31 Al2O3 1.72 1.57 1.5 1.69 FeO 51.83 50.61 49.16 49.21 Fe2O3 15.2 20.32 22.85 21.52 MnO 0.5 0.37 0.41 0.83 MgO 1.52 0.99 1.2 0.97 TiO2 26.13 23.63 22.45 22.75 Cr2O3 0.04 0.02 Total 97.25 97.51 97.57 96.97 Structural formulae calculated with 32 oxygenes Si 0.098 0.08 0.087 0.094 Al 0.609 0.56 0.533 0.604 Fe2+ 13.061 12.786 12.409 12.494 Fe3+ 3.446 4.62 5.188 4.915 Mn 0.128 0.095 0.104 0.213 Mg 0.681 0.445 0.539 0.439 Ti 5.919 5.368 5.096 5.194 Cr 0.008 0.006 Sum 23.951 23.96 23.956 23.953 Usp(a) 76.19 68.82 64.79 66.45 Usp(c) 78.59 70.94 67.62 69.19 "Leg 152, Hole 917A, core 11R-4, 41-44 cm - Aphyric olivine basalt - Unit 13" 210 211 259 SiO2 1.14 1.49 1.37 Al2O3 0.41 1.78 2.78 FeO 31.02 45.7 38.18 Fe2O3 61.9 25.73 43.34 MnO 0.33 0.36 0.23 MgO 0.78 1.4 1.36 TiO2 2.56 19.87 10.78 Cr2O3 0.01 0.02 0 Total 98.13 96.34 98.04 Structural formulae calculated with 32 oxygenes Si 0.35 0.451 0.41 Al 0.148 0.634 0.981 Fe2+ 7.973 11.572 9.555 Fe3+ 14.318 5.862 9.759 Mn 0.086 0.093 0.059 Mg 0.355 0.633 0.605 Ti 0.592 4.525 2.425 Cr 0.002 0.004 0 Sum 23.824 23.774 23.795 Usp(a) 4.93 58.67 30.02 Usp(c) 10.19 62.51 36.11 "Leg 152, Hole 917A, core 18R3, 98-101 cm - Picrite - Unit 25" 118 130 144 SiO2 0.31 0.23 0.4 Al2O3 1.53 1.11 1.36 FeO 44.24 50.69 48.51 Fe2O3 35.02 18.27 20.56 MnO 0.36 0.49 0.7 MgO 0.84 1.47 1.4 TiO2 16.01 24.92 23.09 Cr2O3 0.01 0.13 Total 98.3 97.19 96.15 Structural formulae calculated with 32 oxygenes Si 0.093 0.071 0.123 Al 0.547 0.397 0.489 Fe2+ 11.227 12.856 12.432 Fe3+ 7.992 4.168 4.723 Mn 0.092 0.126 0.183 Mg 0.378 0.665 0.64 Ti 3.653 5.682 5.317 Cr 0.001 0.03 Sum 23.984 23.964 23.939 Usp(a) 45.84 71.72 67.49 Usp(c) 49.05 74.46 70.79 "Leg 152, Hole 917A, core 23R3, 6-7 cm -Hyaloclastite tuff - Unit 35B " 57 58 59 68 82 91 SiO2 0.33 0.24 0.26 0.42 0.56 0.4 Al2O3 1.67 1.45 1.49 1.28 0.88 0.9 FeO 40.12 39.42 38.65 38.99 37.91 39.03 Fe2O3 38.4 38.14 39.91 40.13 42.13 38.11 MnO 0.76 0.84 0.82 0.83 0.69 0.96 MgO 1.59 1.87 1.68 1.73 1.52 1.8 TiO2 14.06 14.14 13.05 13.32 12.09 14.14 Cr2O3 Total 96.93 96.08 95.85 96.7 95.78 95.35 Structural formulae calculated with 32 oxygens Si 0.102 0.072 0.08 0.129 0.175 0.125 Al 0.601 0.526 0.543 0.462 0.322 0.33 Fe2+ 10.257 10.163 10.008 10.001 9.852 10.157 Fe3+ 8.835 8.848 9.3 9.264 9.852 8.926 Mn 0.198 0.219 0.216 0.216 0.182 0.254 Mg 0.725 0.857 0.774 0.79 0.704 0.834 Ti 3.232 3.277 3.039 3.073 2.826 3.31 Cr Sum 23.948 23.963 23.959 23.935 23.912 23.937 Usp(a) 38.54 38.24 35.37 35.69 32.61 38.26 Usp(c) 45.53 46.31 43.18 43.57 39.89 46.34 "Leg 152, Hole 917A, core 40R4, 78-81 cm - Aphyric basalt - Unit 52" 99 102 103 104 SiO2 0.3 0.3 0.32 0.31 Al2O3 1.15 1.41 1.54 1.97 FeO 44.79 48.66 40.94 48.51 Fe2O3 31.87 17.43 23.99 18.22 MnO 0.27 2.62 6.66 3.2 MgO 0.52 1.15 0.94 0.81 TiO2 17.15 24.76 20.84 24.23 Cr2O3 0 0.06 Total 96.05 96.33 95.24 97.3 Structural formulae calculated with 32 oxygenes Si 0.094 0.092 0.1 0.092 Al 0.422 0.508 0.563 0.702 Fe2 11.651 12.446 10.628 12.288 Fe3 7.46 4.012 5.604 4.152 Mn 0.072 0.679 1.751 0.82 Mg 0.241 0.522 0.435 0.364 Ti 4.012 5.694 4.866 5.52 Cr 0 0.014 Sum 23.953 23.954 23.95 23.954 Usp(a) 50.83 71.74 57.38 70.35 Usp(c) 52.77 75.83 68.02 74.64 "Leg 152, Hole 917A, core 47R2, 38-42 cm - Dacite - Unit 54" 349 350 SiO2 1.1 0.98 Al2O3 1.73 1.65 FeO 42.99 42.92 Fe2O3 31.77 32.97 MnO 0.65 0.57 MgO 1.04 1.11 TiO2 16.67 16.39 Cr2O3 0.03 Total 95.98 96.6 Structural formulae calculated with 32 oxygenes Si 0.338 0.299 Al 0.625 0.594 Fe2 11.033 10.96 Fe3 7.336 7.575 Mn 0.168 0.147 Mg 0.475 0.505 Ti 3.846 3.763 Cr 0.008 Sum 23.83 23.843 Usp(a) 49 47.57 Usp(c) 53.19 51.92 "Leg 152, Hole 917A, core 55R4, 98-101 cm - Olivine-plagioclase-pyroxene-phyric basalt- Unit 60" 83 84 88 121 122 123 124 SiO2 0.25 0.19 0.26 0.25 0.5 0.35 0.2 Al2O3 1.38 1.67 1.9 1.46 1.44 2.18 1.85 FeO 47.86 45.93 45.21 46.42 46.01 42.17 44.54 Fe2O3 23.08 25.44 26.39 24.65 24.17 32.77 27.53 MnO 0.48 0.44 0.46 0.43 0.38 0.36 0.44 MgO 2.46 2.76 2.62 2.28 2.54 2.16 2.56 TiO2 22.96 21.22 20.46 21.54 21.66 16.66 19.85 Cr2O3 0.21 1.1 0.74 0.16 0.18 0.3 0.34 Total 98.68 98.75 98.04 97.19 96.88 96.93 97.29 Structural formulae calculated with 32 oxygenes Si 0.075 0.056 0.077 0.075 0.15 0.104 0.059 Al 0.481 0.582 0.668 0.518 0.511 0.777 0.655 Fe2 11.875 11.366 11.265 11.714 11.595 10.676 11.202 Fe3 5.15 5.661 5.913 5.592 5.477 7.46 6.226 Mn 0.12 0.11 0.116 0.11 0.097 0.093 0.111 Mg 1.09 1.218 1.164 1.027 1.143 0.972 1.147 Ti 5.122 4.722 4.583 4.888 4.909 3.793 4.489 Cr 0.049 0.258 0.174 0.038 0.043 0.072 0.082 somme 23.962 23.972 23.962 23.963 23.925 23.948 23.971 Usp(a) 63.68 58.89 57.13 60.69 61.02 46.62 55.34 Usp(c) 68.97 65.53 63.84 66.11 66.86 53.68 62.17 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 134 180 140 SiO2 1 1.01 0.91 Al2O3 0.79 0.93 4.71 FeO 48.37 51.36 39.82 Fe2O3 25.05 16.24 16.84 MnO 0.48 0.52 0.38 MgO 0.5 1.58 2.68 TiO2 21.09 25.99 14.23 Cr2O3 0.01 0.01 17.95 Total 97.28 97.63 97.52 Structural formulae calculated with 32 oxygenes Si 0.305 0.302 0.265 Al 0.283 0.329 1.623 Fe2 12.328 12.865 9.736 Fe3 5.746 3.66 3.705 Mn 0.125 0.132 0.094 Mg 0.227 0.703 1.167 Ti 4.833 5.852 3.129 Cr 0.001 0.001 4.149 Somme 23.847 23.857 23.868 Usp(a) 61.846 74.81 57.427 Usp(c) 63.548 77.78 66.991 "Leg 152, Hole 917A, core 67R-3, 130-132 cm - Olivine-plagioclase-pyroxene-phyric basalt - Unit 70" 153 154 155 157 SiO2 0.24 0.21 0.26 0.53 Al2O3 0.98 0.87 0.87 0.96 FeO 43.85 47.99 45.93 47 Fe2O3 32.72 25.14 29.16 24.94 MnO 0.38 0.32 0.31 0.54 MgO 1.05 0.81 0.52 1.19 TiO2 17.07 21.03 18.59 21 Cr2O3 0.04 0.02 0.01 Total 96.28 96.41 95.65 96.17 Structural formulae calculated with 32 oxygenes Si 0.075 0.066 0.08 0.163 Al 0.357 0.315 0.321 0.35 Fe2+ 11.355 12.395 12.006 12.091 Fe3+ 7.62 5.838 6.855 5.769 Mn 0.099 0.084 0.081 0.141 Mg 0.484 0.373 0.243 0.545 Ti 3.974 4.885 4.369 4.858 Cr 0.01 0.005 0.002 Sum 23.963 23.967 23.96 23.919 Usp(a) 49.14 61.45 55.09 61 Usp(c) 52.8 63.64 56.92 64.31 "Leg 152, Hole 917A, core 72R-1, 82-85 cm - Olivine-phyric basalt - Unit 73A " 17 18 68 SiO2 0.4 0.37 0.37 Al2O3 1.44 1.73 1.55 FeO 53.08 52.22 51.91 Fe2O3 14.04 16.05 16.11 MnO 0.51 0.48 0.5 MgO 0.34 0.43 1.21 TiO2 26.05 25.03 25.7 Cr2O3 0.07 0.05 0.04 Total 95.93 96.35 97.39 Structural formulae calculated with 32 oxygenes Si 0.122 0.114 0.11 Al 0.523 0.624 0.552 Fe2 13.687 13.395 13.105 Fe3 3.257 3.704 3.66 Mn 0.134 0.124 0.129 Mg 0.157 0.197 0.544 Ti 6.04 5.773 5.834 Cr 0.018 0.011 0.01 Total 23.939 23.943 23.945 Usp(a) 78.35 75.19 75.02 Usp(c) 79.16 76.21 77.12 "Leg 152, Hole 917A, core 79R-2, 64-67 cm - Olivine-phyric basalt - Unit 78" 136 146 149 SiO2 0.43 0.39 0.56 Al2O3 1.5 1.62 1.77 FeO 46.77 46.41 45.48 Fe2O3 23.61 28.01 28.96 MnO 1.29 0.65 0.51 MgO 0.98 0.74 0.52 TiO2 21.21 19.27 18.16 Cr2O3 Total 95.79 97.08 95.95 Structural formulae calculated with 32 oxygenes Si 0.133 0.118 0.172 Al 0.546 0.582 0.644 Fe2 12.065 11.862 11.761 Fe3 5.481 6.441 6.739 Mn 0.336 0.169 0.135 Mg 0.452 0.339 0.24 Ti 4.92 4.43 4.223 Cr Sum 23.933 23.941 23.914 Usp(a) 62.28 56.46 54.5 Usp(c) 65.97 59.25 56.69 "Leg 152, Hole 917A, core 88R-7, 83-86 cm - Aphyric olivine basalt - Unit 84" 8 94 SiO2 0.19 0.2 Al2O3 1.99 2.09 FeO 41.08 44.38 Fe2O3 36.59 27.51 MnO 0.12 0.32 MgO 1.82 2.27 TiO2 14.78 19.41 Cr2O3 0.03 Total 96.59 96.16 Structural formulae calculated with 32 oxygenes Si 0.058 0.061 Al 0.716 0.749 Fe2+ 10.51 11.303 Fe3+ 8.417 6.3 Mn 0.031 0.081 Mg 0.831 1.031 Ti 3.4 4.445 Cr 0.008 Sum 23.971 23.97 Usp(a) 41.35 55.23 Usp(c) 47.64 61.34 "Leg 152, Hole 917A, core 94R-1, 71-74 cm - Aphyric olivine basalt - Unit 87" 124 136 150 SiO2 0.22 0.22 0.22 Al2O3 1.84 1.85 1.3 FeO 37.22 40.17 39.42 Fe2O3 44.69 36.92 42.29 MnO 0.26 0.37 0.34 MgO 1.85 2.26 1.55 TiO2 10.76 14.77 12.53 Cr2O3 0.05 0.23 0.12 Total 96.88 96.79 97.77 Structural formulae calculated with 32 oxygenes Si 0.067 0.066 0.066 Al 0.662 0.662 0.466 Fe2+ 9.534 10.225 10.044 Fe3+ 10.302 8.455 9.697 Mn 0.067 0.095 0.087 Mg 0.843 1.027 0.706 Ti 2.479 3.381 2.872 Cr 0.011 0.056 0.029 Sum 23.966 23.967 23.966 Usp(a) 28.21 40.02 33.8 Usp(c) 36.29 48.26 40.27 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 199 266 SiO2 0.3 0.32 Al2O3 2.23 1.63 FeO 39.28 37.15 Fe2O3 37.91 43.22 MnO 0.42 0.27 MgO 2.19 1.57 TiO2 13.88 10.9 Cr2O3 0.07 0.07 Total 96.29 95.11 Structural formulae calculated with 32 oxygenes Si 0.093 0.1 Al 0.802 0.6 Fe2+ 10.034 9.708 Fe3+ 8.714 10.163 Mn 0.109 0.071 Mg 0.997 0.729 Ti 3.188 2.561 Cr 0.016 0.017 Sum 23.953 23.949 Usp(a) 37.68 29.83 Usp(c) 46.2 36.82 A. Demant "Leg 152, East Greenland margin" Microprobe analyses of ilmenites "Leg 152, Hole 917A, core 18R3, 98-101 cm - Picrite - Unit 25" 106 131 143 SiO2 0.13 0.15 0.2 Al2O3 0.11 0.05 0.04 FeO 43.35 41.81 40.96 Fe2O3 0.81 5.29 6.7 MnO 0.33 0.47 0.55 MgO 1.48 1.25 1.32 TiO2 51.43 49.47 48.75 Total 97.63 98.49 98.51 Structural formulae calculated with 6 oxygens Si 0.007 0.008 0.01 Al 0.006 0.003 0.002 Fe2+ 1.852 1.778 1.741 Fe3+ 0.031 0.202 0.256 Mn 0.014 0.02 0.024 Mg 0.113 0.095 0.1 Ti 1.976 1.892 1.864 Sum 3.999 3.998 3.997 Hem(a) 0.83 5.39 6.86 Hem(c) 0.78 5.08 6.43 "Leg 152, Hole 917A, core 57R-3, 64-67 cm - Picrite - Unit 61B " 192 193 195 252 253 254 137 138 139 141 SiO2 0.84 0.84 0.77 0.78 0.84 0.81 0.74 0.78 0.77 0.74 Al2O3 0.12 0.05 0.1 0.05 0.07 0.01 0.1 0.08 0.01 0.06 FeO 40.3 40.72 41.18 41.16 40.74 40.04 44.69 45.01 47.09 45.82 Fe2O3 5.31 4.52 2.46 2.52 5.7 2.93 0.08 0.08 0.08 0.08 MnO 0.55 0.48 0.43 0.52 0.52 0.46 0.49 0.49 0.67 0.5 MgO 1.95 1.93 2.42 2.29 1.82 3.03 2.47 2.32 1.35 2.04 TiO2 49.2 49.6 50.97 50.85 49.44 51.04 50.98 51.14 50.21 50.64 Total 98.27 98.14 98.32 98.17 99.13 98.32 99.54 99.91 100.16 99.88 Structural formulae calculated with 6 oxygenes Si 0.043 0.042 0.038 0.039 0.042 0.04 0.036 0.038 0.038 0.036 Al 0.007 0.003 0.006 0.003 0.004 0.001 0.006 0.005 0 0.003 Fe2 1.7 1.719 1.728 1.732 1.706 1.673 1.695 1.707 1.741 1.711 Fe3 0.201 0.172 0.093 0.096 0.215 0.11 0.155 0.151 0.211 0.185 Mn 0.023 0.02 0.018 0.022 0.022 0.019 0.02 0.02 0.028 0.021 Mg 0.146 0.146 0.181 0.172 0.136 0.226 0.182 0.171 0.1 0.15 Ti 1.866 1.883 1.923 1.923 1.862 1.917 1.894 1.895 1.869 1.881 Sum 3.987 3.986 3.987 3.986 3.986 3.986 3.989 3.988 3.987 3.988 Hem(a) 5.6 4.76 2.63 2.69 5.93 3.18 4.38 4.25 5.71 5.12 Hem(c) 5.12 4.36 2.36 2.42 5.45 2.79 3.93 3.84 5.34 4.68 "Leg 152, Hole 917A, core 67R-3, 130-132 cm - Olivine-plagioclase-pyroxene-phyric basalt - Unit 70" 156 173 174 SiO2 0.24 0.26 0.25 Al2O3 0.06 0.04 0.04 FeO 41.36 41.27 38.93 Fe2O3 4.88 5.89 9.35 MnO 0.93 0.43 0.42 MgO 1.24 1.6 1.59 TiO2 49.44 49.51 46.86 Total 98.16 99 97.43 Structural formulae calculated with 6 oxygenes Si 0.012 0.013 0.013 Al 0.004 0.003 0.003 Fe2 1.763 1.741 1.671 Fe3 0.187 0.224 0.361 Mn 0.04 0.018 0.018 Mg 0.094 0.12 0.121 Ti 1.895 1.878 1.808 Sum 3.997 3.996 3.996 Hem(a) 5.05 6.04 9.76 Hem(c) 4.7 5.62 9.07 "Leg 152, Hole 917A, core 88R-7, 83-86 cm - Aphyric olivine basalt - Unit 84" 34 43 48 57 59 95 96 97 SiO2 0.13 0.17 0.13 0.21 0.14 0.16 0.52 0.15 Al2O3 0.13 0.12 0.14 0.09 0.11 0.05 0.26 0.2 FeO 36.44 37.07 36.53 36.96 34.9 38.14 35.47 35.92 Fe2O3 10.46 9.19 8.69 8.23 11.74 7.81 11.81 10.89 MnO 0.39 0.38 0.44 0.39 0.43 0.3 0.46 0.31 MgO 3.86 3.58 3.85 3.63 4.07 2.89 3.14 3.75 TiO2 48.3 48.65 48.61 48.65 47.28 48.45 45.98 47.58 Total 99.71 99.15 98.39 98.16 98.67 97.8 97.64 98.8 Structural formulae calculated with 6 oxygenes Si 0.007 0.008 0.006 0.01 0.007 0.008 0.026 0.007 Al 0.008 0.007 0.008 0.005 0.006 0.003 0.016 0.012 Fe2+ 1.499 1.54 1.526 1.549 1.454 1.614 1.499 1.497 Fe3+ 0.387 0.343 0.327 0.311 0.44 0.297 0.449 0.408 Mn 0.016 0.016 0.019 0.017 0.018 0.013 0.02 0.013 Mg 0.283 0.265 0.286 0.271 0.302 0.218 0.237 0.279 Ti 1.786 1.818 1.826 1.833 1.771 1.844 1.747 1.783 Sum 4.002 3.998 4 3.998 3.999 3.998 3.994 3.999 Hem(a) 11.51 10.05 9.7 9.13 13.17 8.44 13.09 12.04 Hem(c) 9.77 8.63 8.21 7.81 11.05 7.46 11.39 10.27 "Leg 152, Hole 917A, core 94R-3, 64-65 cm - Aphyric olivine basalt - Unit 87" 125 133 144 SiO2 0.16 0.15 0.17 Al2O3 0.13 0.12 0.04 FeO 36.77 35.63 36.89 Fe2O3 9.04 11.52 8.82 MnO 0.34 0.42 0.37 MgO 3.48 3.76 3.7 TiO2 48.07 47.46 48.73 Total 97.98 99.06 98.72 Structural formulae calculated with 6 oxygenes Si 0.008 0.008 0.008 Al 0.008 0.007 0.003 Fe2+ 1.547 1.482 1.538 Fe3+ 0.342 0.431 0.331 Mn 0.014 0.018 0.016 Mg 0.261 0.279 0.275 Ti 1.818 1.775 1.826 Sum 3.999 3.999 3.996 Hem(a) 9.98 12.73 9.72 Hem(c) 8.6 10.83 8.3