Table T10. Chemical composition of samples from Hole 735B. (Continued on next 12 pages.)
118-735B | 176-735B | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hole: | B | B | B | B | B | B | B | B | B | B | B | B | B | B | B | |
Core: | 74 | 78 | 79 | 82 | 85 | 86 | 87 | 88 | 90 | 90 | 90 | 91 | 91 | 92 | 93 | |
Type: | R | R | R | R | R | R | R | N | R | R | R | R | R | R | R | |
Section: | 6 | 1 | 7 | 1 | 3 | 4 | 6 | 1 | 1 | 4 | 7 | 1 | 3 | 1 | 3 | |
Top (cm): | 45 | 114 | 115 | 13 | 47 | 78 | 98 | 48 | 115 | 41 | 55 | 105 | 92 | 25 | 85 | |
Bottom (cm): | 51 | 118 | 118 | 16 | 54 | 81 | 102 | 51 | 121 | 47 | 62 | 114 | 100 | 30 | 92 | |
Piece: | 4A | 5A | 10 | 2A | 1F | 4B | 13 | 2B | 2 | 1B | 1B | 3B | 1D | 4 | 1E | |
Depth (mbsf): | 382.2 | 410.5 | 423.9 | 443.1 | 474.7 | 486.1 | 499.1 | 500.5 | 508.9 | 512.0 | 515.8 | 518.9 | 522.5 | 527.5 | 534.7 | |
Li_Int: | 460 | 474 | 491a | 495 | 497a | 497a | 501 | 504 | 506 | 509 | 510 | |||||
Rock type: | OxGa | OxGa | OxGa | OxGa | OxGa | OlGa | OlGa | Troc | Troc | TrocGa | Troc | Troc | altGa | Ga | Ga | |
SiO2 (wt%): | 52.01 | 48.83 | 46.48 | 49.44 | 46.86 | 51.53 | 49.64 | 46.86 | 48.10 | 48.42 | 48.38 | 43.82 | 44.48 | 54.26 | 52.11 | |
TiO2 (wt%): | 1.60 | 2.26 | 3.62 | 2.66 | 4.91 | 0.38 | 0.15 | 0.09 | 0.11 | 0.10 | 0.16 | 0.15 | 0.19 | 0.60 | 0.50 | |
Al2O3 (wt%): | 14.82 | 14.05 | 12.79 | 13.30 | 13.70 | 16.33 | 19.21 | 20.45 | 22.05 | 18.01 | 19.72 | 13.37 | 22.89 | 16.46 | 15.75 | |
Fe2O3 (wt%): | 12.24 | 14.45 | 19.01 | 16.82 | 17.62 | 7.62 | 5.48 | 6.01 | 5.35 | 5.64 | 5.81 | 9.41 | 6.91 | 6.46 | 7.82 | |
MnO (wt%): | 0.21 | 0.22 | 0.30 | 0.26 | 0.25 | 0.13 | 0.10 | 0.09 | 0.09 | 0.09 | 0.10 | 0.14 | 0.11 | 0.11 | 0.14 | |
MgO (wt%): | 6.43 | 7.07 | 4.87 | 4.34 | 4.66 | 9.90 | 11.37 | 13.50 | 11.39 | 14.77 | 12.17 | 24.03 | 4.98 | 7.05 | 8.34 | |
CaO (wt%): | 10.25 | 10.90 | 9.59 | 9.27 | 9.04 | 12.67 | 12.34 | 10.24 | 11.27 | 11.83 | 11.76 | 7.94 | 18.96 | 12.72 | 13.09 | |
Na2O (wt%): | 3.65 | 3.16 | 3.56 | 3.99 | 3.67 | 2.85 | 2.43 | 2.14 | 2.40 | 1.67 | 2.11 | 1.08 | 2.62 | 3.86 | 3.01 | |
K2O (wt%): | 0.07 | 0.10 | 0.07 | 0.13 | 0.05 | 0.05 | 0.04 | 0.06 | 0.01 | 0.20 | 0.03 | 0.01 | 0.21 | 0.05 | 0.06 | |
P2O5 (wt%): | 0.09 | 0.43 | 0.57 | 0.49 | 0.11 | 0.01 | 0.01 | 0.01 | 0.01 | 0.00 | 0.01 | 0.01 | 0.13 | 0.02 | 0.02 | |
Total (wt%): | 101.37 | 101.47 | 100.86 | 100.70 | 100.87 | 101.47 | 100.77 | 99.45 | 100.76 | 100.72 | 100.24 | 99.95 | 101.47 | 101.58 | 100.82 | |
LOI: | 0.33 | 0.04 | 0.44 | 0.28 | -0.18 | -0.61 | -0.87 | -1.30 | -0.60 | -2.22 | -0.57 | -1.36 | -9.24 | -1.68 | -0.75 | |
FeO(tit): | 8.31 | 10.03 | 12.63 | 11.01 | 11.62 | 5.96 | ND | 5.10 | 4.47 | 4.54 | 5.13 | 8.00 | 1.42 | 4.66 | 5.34 | |
%Fe2+: | 75 | 77 | 74 | 73 | 73 | 87 | ND | 96 | 93 | 91 | 99 | 96 | 25 | 82 | 77 | |
Mg-value: | 0.58 | 0.56 | 0.41 | 0.41 | 0.42 | 0.75 | ND | 0.82 | 0.82 | 0.85 | 0.81 | 0.84 | 0.85 | 0.73 | 0.73 | |
Mg#: | 0.550 | 0.533 | 0.374 | 0.376 | 0.381 | 0.752 | 0.829 | 0.840 | 0.832 | 0.859 | 0.830 | 0.856 | 0.627 | 0.718 | 0.713 | |
Ca#: | 0.608 | 0.656 | 0.598 | 0.562 | 0.576 | 0.711 | 0.737 | 0.726 | 0.722 | 0.797 | 0.755 | 0.802 | 0.800 | 0.645 | 0.706 | |
V (ppm): | 311 | 180 | 220 | 188 | 504 | 165 | 81 | 30 | 38 | 71 | 76 | 48 | 80 | 228 | 209 | |
Cr (ppm): | 168 | 417 | 0 | 14 | 0 | 283 | 820 | 194 | 228 | 1202 | 251 | 742 | 40 | 7 | 27 | |
Ni (ppm): | 59 | 101 | 64 | 42 | 35 | 114 | 287 | 410 | 329 | 413 | 294 | 770 | 276 | 58 | 75 | |
Cu (ppm): | 54 | 108 | 119 | 70 | 107 | 20 | 22 | 80 | 86 | 105 | 46 | 60 | 70 | 10 | 58 | |
Zn (ppm): | 87 | 117 | 166 | 161 | 99 | 46 | 34 | 39 | 33 | 47 | 39 | 52 | 56 | 24 | 47 | |
Rb (ppm): | 2 | 3 | 2 | 3 | 2 | 2 | 2 | 1 | 1 | 2 | 2 | 2 | 5 | 1 | 1 | |
Sr (ppm): | 171 | 151 | 164 | 158 | 159 | 166 | 168 | 175 | 184 | 135 | 168 | 109 | 219 | 229 | 166 | |
Y (ppm): | 30 | 59 | 71 | 95 | 30 | 11 | 10 | 4 | 5 | 6 | 6 | 5 | 6 | 15 | 14 | |
Zr (ppm): | 81 | 92 | 89 | 250 | 93 | 25 | 29 | 19 | 21 | 21 | 22 | 15 | 28 | 41 | 33 | |
Nb (ppm): | 1 | 5 | 7 | 6 | 3 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | |
Notes: Li_Int = lithologic interval (see "Igneous Petrology"). Rock type = rock names assigned on the basis of modal data determined by point counting. Troc = troctolite; TrocGa = troctolitic gabbro; OlGa = olivine gabbro; Ga = gabbro; DiOlGa = disseminated oxide olivine gabbro; OxGa = oxide gabbro; LeuGa = leucocratic gabbro; OpxOxGa = orthopyroxene-bearing oxide gabbro; altGa = heavily altered gabbro; felsic = diorite or plagiogranite; mixed = intimately mixed felsic and mafic components. Major elements determined on ignited powder; %FeO(tit) and minor and trace elements on powder dried at 110°C. Concentration units: weight percent for major element oxides, LOI and FeO(tit); parts per million for minor and trace elements. LOI = weight loss on ignition; negative values = loss of weight; positive values = gain of weight, i.e., oxygen uptake > volatile loss. FeO(tit) = weight percent ferrous iron oxide determined by redox titration. %Fe2+ = percentage of total iron present as ferrous iron, calculated from FeO(tit) and Fe2O3 determined by X-ray fluorescence. Mg-value = Mg-number, calculated from %Fe2+. Mg# = Mg-number, calculated value for ferrous iron set equal to 85% of total iron. Ca# = (Ca/Ca+Na) molar; ND = not determined.