Table T1. X-ray diffraction data for Site 1092. Note: XRD = X-ray diffraction. Leg Site Hole Core Type Section Top Bot Depth (mbsf) Depth (mcd) Bulk Carbonate Calculated Silicates Opal (wt%) Quartz/Feldspar Clay Minerals to (wt%) Bulk-Opal Bulk opal-free fraction Ratio Quartz + Feldspar Ratio from coulometry (wt%) (wt%) (XRD Peak Intensity) (XRD Peak Area) (XRD Peak Area) 177 1092 A 1 H 5 62 63 6.625 9.18 80.1 14 5.9 70.5 6.87 0.048 177 1092 A 2 H 1 37 39 8.38 12 50.9 35.3 13.8 71.9 0.78 0.236 177 1092 A 2 H 3 26 27 11.265 14.89 64.2 28.3 7.5 79.1 6.04 0.105 177 1092 A 2 H 5 42 44 14.43 18.05 51.1 36 12.9 73.6 1.76 177 1092 A 3 H 1 109 111 18.6 23.33 42.1 46.2 11.7 79.8 1.25 177 1092 A 3 H 2 110 112 20.11 24.84 2.18 0.106 177 1092 A 3 H 5 70 72 24.21 28.94 36.3 57.6 6.1 90.4 2.77 177 1092 A 4 H 2 61 62 29.115 33.99 16.7 79.6 3.7 95.6 2.16 177 1092 A 4 H 4 70 71 32.205 37.08 52 37.1 10.9 77.4 1.97 0.083 177 1092 A 5 H 1 117 119 37.68 43.55 52.6 30.3 17.1 64 3.31 177 1092 A 5 H 5 69 71 43.2 49.07 68 14.9 17.1 46.5 2.87 0.064 177 1092 A 6 H 2 46 48 47.97 55.86 69.4 14 16.6 45.8 2.26 0.083 177 1092 A 6 H 6 66 68 54.17 62.06 91.1 4.5 4.4 50.3 1.74 0.133 177 1092 A 7 H 1 120 122 56.71 65.4 81.3 7.4 11.3 39.7 1.74 0.107 177 1092 A 7 H 5 30 32 61.81 70.5 71.6 11.9 16.5 42.1 1.95 0.073 177 1092 A 8 H 1 120 122 66.21 75.66 78.1 8.5 13.4 38.6 1.34 0.104 177 1092 A 8 H 4 71 73 70.22 79.67 85.7 6.6 7.7 45.8 1.47 0.134 177 1092 A 9 H 2 71 73 76.72 86.05 81.3 1.64 0.148 177 1092 A 9 H 4 71 73 79.67 89 84.1 177 1092 A 10 H 1 73 75 84.74 95.28 89.6 1.09 0.224 177 1092 A 10 H 5 73 75 90.74 101.28 88.8 1.78 0.112 177 1092 A 11 H 2 89 91 95.9 108.39 89.3 1.7 9 15.5 1.64 0.181 177 1092 A 11 H 5 71 73 100.22 112.71 89.9 1.7 8.4 17.2 1.76 0.175 177 1092 A 12 H 1 73 75 103.74 116.15 86.7 2.2 11.1 16.6 2.08 0.172 177 1092 A 12 H 5 71 73 109.67 122.08 94 1.3 4.7 21.4 1.93 0.149 177 1092 A 13 H 2 69 71 114.7 128.92 89.2 5.2 5.6 48.2 1.77 0.101 177 1092 A 13 H 6 71 73 120.72 134.94 91.9 2.3 5.8 28.5 1.69 0.126 177 1092 A 14 H 1 118 120 123.19 139.31 86 7.3 6.7 52.3 1.9 0.136 177 1092 A 14 H 5 120 122 129.21 145.33 88.8 2.4 8.8 21.4 1.72 0.124 177 1092 A 15 H 5 120 122 138.71 156.95 93.4 1.7 4.9 25.6 1.65 0.174 177 1092 A 16 H 5 120 123 148.215 167.4 91.3 2.3 6.4 26.2 1.65 0.189 177 1092 A 17 H 3 116 119 154.105 172.33 94.6 1.2 4.2 22.6 1.89 0.195 177 1092 A 17 H 5 116 119 157.105 175.33 86.4 1.2 12.4 8.9 1.92 0.19 177 1092 A 18 H 1 120 123 161.215 181.07 87.2 2 10.8 15.5 2.08 0.258 177 1092 A 18 H 5 120 123 167.215 187.07 93.3 0.8 5.9 12.5 1.9 0.298 177 1092 A 19 H 1 65 68 170.165 192.51 86.8 3.1 10.1 23.2 1.69 0.288 177 1092 A 19 H 2 65 68 171.665 194.01 84.2 3.6 12.2 22.6 2.46 0.32 177 1092 A 19 H 5 65 68 176.165 198.51 91.3 2.1 6.6 24.4 1.48 0.267 177 1092 A 20 H 1 66 69 179.675 202.02 89.4 2 8.6 18.4 1.64 0.283 177 1092 A 20 H 6 66 69 187.175 209.52 89.2 2.3 8.5 21.4 1 0.212