"Table 12. Composition of gas released from gas-collection chambers, Hole 994A." "Core, section" Depth (mbsf) O2 (ppmv) N2 (ppmv) C1 (ppmv) CO2 (ppmv) C2 (ppmv) C3 (ppmv) i-C4 n-C4 i-C5 n-C5 C1/C2 C1/C2+ 164-994A- 5H-3 35.9 50000 199000 41000 6H-3 45.1 130000 538000 246000 5400 13 19100 19100 6H-3 45.1 136000 575000 245000 5400 13 18200 18200 6H-3 45.1 109000 461000 244000 9700 16 4 1 15300 11600 7H-3 54.9 139000 584000 240000 5700 7 4 1 34200 20000 8H-3 64.4 118000 490000 349000 9000 14 8 2 25000 14600 8H-5 67.4 126000 522000 298000 9700 14 6 1 21300 14200 10H-1 71.9 157000 652000 156000 6400 7 3 1 22200 14200 11H-3 84.4 133000 549000 269000 10400 16 5 1 16800 12200 12H-3 93.9 155000 645000 161000 6600 5 3 1 32200 17900 13H-2 101.9 135000 561000 260000 13800 8 5 2 32500 17300 14H-4 114.4 150000 621000 181000 11300 6 4 2 30100 15100 15H-2 120.26 125000 535000 286000 21100 11 9 4 1 1 26000 11000 16H-3 131.9 119000 493000 333000 22300 13 8 3 1 1 1 25600 12300 17H-4 142.9 98000 407000 432000 37600 14 10 4 1 2 1 30800 13500 25X-1 203.3 85000 370000 206000 16700 8 5 2 2 25700 12100 30X-5 246.83 140000 616000 182000 35700 14 7 3 1 2 13000 6730 31X-6 258.8 27000 102000 177000 900 1 1 2 44300 31X-5 257.3 8000 26000 939000 86 2 10900 10700 40X-2 329.8 152000 621000 120000 9300 11 4 1 1 10900 7080 41X-4 341.77 153000 635000 64000 12400 12 10 1 2 5360 2570 42X-2 349.1 150000 622000 123000 24100 24 5 1 2 5140 3850 47X-2 387.6 147000 622000 105000 17400 28 2 1 1 1 3760 3190 49X-2 398.1 134000 585000 105000 27200 50 2 1 3 2 2100 1810 50X-2 406.7 152000 648000 87000 22300 27 25 2 2 2 3220 1500 52X-1 424.5 149000 672000 140000 8300 12 5 2 1 2 11700 6380 58X-2 474.1 160000 671000 66000 20100 39 2 1 1 1 1690 1490 61X-3 495.9 152000 629000 60000 28100 67 4 1 13 2 1 900 685 63X-3 513.18 153000 645000 101000 36900 67 4 1 1 1 1 1500 1340 67X-2 542.45 149000 668000 79000 42200 91 7 1 1 1 2 870 768 68X-2 550.3 146000 616000 73000 34100 62 4 1 1 1 1180 1060 69X-2 560.71 138000 591000 98000 42100 85 12 1 1 1 1150 976 71X-1 569.9 148000 621000 77000 24600 70 17 1 1 1100 870 76X-2 618.5 153000 640000 78000 28800 109 7 1 1 1 715 655 79X-2 646.88 156000 655000 69000 23900 90 5 1 1 1 764 701 80X-3 657.41 147000 605000 77000 23100 97 7 1 1 1 789 715 81X-2 665.34 159000 664000 78000 24500 88 5 1 1 1 0 889 814 "Notes: Total gas volumes released from the chambers are reported in Table 4, this volume. Analyses were conducted on subsamples of the total gas volume. " "Oxygen (O2) and nitrogen (N2) concentrations are included as a guide to the amount of air contamination in each sample. C1 through C6 = 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. C1/C2 = the methane/ethane ratio, and C1/C2+ = the ratio of methane/the sum of (C2 through C6)."