Table 6. Composition of headspace gases (ppm) from Site 1006. Site H Core T Sec Depth C1 C2 C3 i C4 n C4 i C5 n C5 i C6 n C6 C1/C2 C1/C2+ mbsf ppm-v 1006 A 1 H 2 1.5 2 1006 A 2 H 6 14.6 2 1006 A 3 H 6 24.1 2 1006 A 4 H 3 29.1 3 1006 A 5 H 3 38.6 4 1006 A 6 H 3 48.1 5 1006 A 7 H 3 57.6 5 1006 A 8 H 3 67.1 7 1006 A 9 H 3 76.6 8 1006 A 10 H 3 86.1 5 1006 A 11 H 3 95.6 8 1006 A 12 H 3 105.1 8 1006 A 13 H 3 114.6 8 1006 A 14 H 3 124.1 11 1006 A 15 H 3 133.6 9 1006 A 16 H 3 143.1 8 1006 A 17 H 3 152.6 26 1006 A 18 H 3 162.1 50 1006 A 19 H 3 171.6 71 0.2 355 355 1006 A 20 H 3 181.1 105 0.2 525 525 1006 A 21 H 3 190.6 294 0.2 1470 1470 1006 A 22 H 3 200.1 636 0.5 1272 1272 1006 A 23 H 3 209.6 756 0.8 945 945 1006 A 24 H 3 219.1 1034 1 1034 1034 1006 A 25 H 3 228.6 1499 2 0.4 750 625 1006 A 26 H 3 238.1 1872 2 0.3 936 814 1006 A 27 H 3 247.6 1729 2 0.4 865 720 1006 A 28 H 3 257.1 2754 6 0.7 459 411 1006 A 29 H 3 266.6 3550 8 0.8 444 403 1006 A 30 X 3 276.1 3423 9 1 380 342 1006 A 31 X 3 281.9 3273 7 1 468 409 1006 A 32 X 3 287.7 3692 8 1 462 410 1006 A 33 X 3 296.9 2660 6 1 443 380 1006 A 34 X 3 306.1 3772 10 1 0.3 1 377 307 1006 A 35 X 3 315.4 6555 20 3 0.3 1 1 328 259 1006 A 36 X 3 324.5 8450 27 3 0.3 1 313 270 1006 A 37 X 3 333.6 10845 37 4 1 0.4 1 293 250 1006 A 38 X 2 341.3 8395 26 3 0.4 1 323 276 1006 A 39 X 2 350.4 9247 27 3 0.5 0.4 1 342 290 1006 A 40 X 3 361.1 8366 31 3 0.5 0.4 1 0.3 270 231 1006 A 41 X 3 370.3 10545 33 3 1 1 1 320 270 1006 A 42 X 2 377.9 8838 35 4 1 1 1 0.3 253 209 1006 A 43 X 1 385.6 5629 16 3 0.3 1 1 0.3 352 261 1006 A 44 X 3 397.7 8166 30 4 1 0.5 1 272 224 Site H Core T Sec Depth C1 C2 C3 i C4 n C4 i C5 n C5 i C6 n C6 C1/C2 C1/C2+ mbsf ppm-v 1006 A 45 X 3 407 6952 22 3 0.4 0.4 1 316 259 1006 A 46 X 3 416.4 11208 43 5 1 1 1 261 220 1006 A 47 X 3 425.8 7366 23 4 1 1 2 0.4 320 235 1006 A 48 X 3 435 9670 32 3 1 0.5 1 0.3 302 256 1006 A 49 X 3 444 11690 39 5 1 1 2 0.4 300 242 1006 A 50 X 3 453.1 12305 47 7 1 1 3 1 0.3 0.3 262 203 1006 A 51 X 3 462.3 6816 20 4 1 1 1 0.3 341 250 1006 A 52 X 3 471.7 11481 37 5 1 1 1 0.3 0.2 0.2 310 251 1006 A 53 X 3 481.1 14241 45 6 1 1 2 0.3 316 258 1006 A 54 X 3 490.2 15323 51 8 1 1 2 0.4 0.2 300 241 1006 A 55 X 3 499.3 12331 45 7 1 1 2 0.4 0.2 274 218 1006 A 56 X 6 512.9 6200 17 3 0.6 0.5 1 365 281 1006 A 57 X 4 519.5 10410 36 6 1 1 2 0.4 0.2 289 223 1006 A 58 X 5 530.7 12563 51 12 2 2 5 0.6 0.6 246 172 1006 A 59 X 3 537.3 18145 68 13 2 2 4 0.6 0.4 267 202 1006 A 60 X 5 549.9 19234 69 11 0.9 1 2 0.3 0.3 279 228 1006 A 61 X 5 559.5 6849 20 5 0.7 0.8 2 0.3 0.2 342 236 1006 A 62 X 5 569.2 16188 64 9 0.9 0.8 2 0.3 253 210 1006 A 63 X 6 580.3 18774 69 12 1 1 3 0.5 0.3 272 216 1006 A 64 X 5 588.4 5390 13 3 0.3 0.5 415 321 1006 A 65 X 5 598.1 21104 90 16 3 2 3 0.5 0.3 234 184 1006 A 66 X 2 603.2 8459 29 5 0.5 1 1 292 232 1006 A 67 X 3 614.4 17059 69 14 1 1 1 0.3 0.2 0.2 247 197 1006 A 68 X 5 627 10350 43 13 1 2 1 0.3 0.2 241 171 1006 A 69 X 1 630.6 1227 3 1 1 409 245 1006 A 72 X 6 667 25438 101 28 4 4 6 1 0.5 0.5 252 175 1006 A 73 X 3 672.2 18016 73 23 4 4 7 2 0.7 247 158 1006 A 74 X 6 686.3 15120 61 16 2 2 5 1 0.5 0.4 248 172 1006 A 75 X 3 691.4 17587 73 21 3 3 6 1 241 164 1006 A 76 X 1 698.1 12968 65 34 6 7 18 4 2 2 200 94 1006 A 77 X 4 712.2 25295 39 20 3 2 5 1 649 361 "Notes: Below 66.7 mbsf, gas analysis is performed using the NGA. C1 to C6 headings represent the" "alkanes: methane, ethane, propane, butane, pentane, and hexane. Iso and normal configurations of" "butane, pentane, and hexane are designated with I and n prefixes respectively. C1/C2 = the" "methane/ethane ratio, C1/C2+ = the ratio methane/(C2 to C6)."