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Table T14. Headspace gas composition from safety monitoring analysis in sediments, Site C0008. (See table notes.)

Core, section,
interval (cm)
Depth
CSF (m)
Headspace gas (ppmv) C1/C2
Methane Ethane
316-C0008A-
1H-1, 136.5–140.5 1.39 12.2 0.0
2H-1, 137.5–141.5 8.33 8,985.0 2.7 3,374
3H-1, 139.5–143.5 16.92 16,611.1 4.7 3,538
4H-1, 129.5–133.5 26.32 43,903.7 8.1 5,451
5H-1, 128–132 35.80 6,864.6 3.1 2,233
6H-1, 129–133 45.31 6,393.5 2.4 2,615
7H-1, 127.5–131.5 54.80 8,529.3 2.1 4,107
8H-1, 129–133 64.31 4,954.8 2.6 1,920
9H-1, 126.5–130.5 73.79 3,482.3 1.8 1,907
10H-1, 94–98 82.96 5,746.6 4.3 1,324
11H-1, 137–141 91.89 6,817.5 3.2 2,131
12H-1, 86.5–90.5 100.89 5,274.5 3.8 1,399
13H-1, 137.5–141.5 110.90 2,953.0 3.9 759
15H-3, 95–99 121.45 6,701.3 4.9 1,369
16H-1, 38.5–42.5 127.88 4,946.0 8.5 579
17H-2, 126.5–130.5 132.44 6,112.8 9.9 619
18H-1, 128–132 141.69 12,011.4 18.1 665
19H-1, 145–149 151.36 7,764.4 7.8 998
20H-1, 126.5–130.5 154.04 7,730.3 7.5 1,027
21H-1, 136.5–140.5 160.12 1,766.6 4.2 423
22H-2, 127–131 169.79 6,637.6 5.3 1,256
23H-1, 126.5–130.5 179.02 4,730.8 5.0 952
24H-2, 126–130 188.97 3,916.8 10.1 387
25H-1, 143.5–147.5 198.19 5,536.5 8.6 647
26H-1, 128–132 202.19 6,158.3 8.8 702
27H-1, 127–131 211.68 5,389.8 7.8 687
28H-1, 127–131 221.18 10,751.4 5.3 2,018
29X-1, 127–131 226.04 6,935.1 4.0 1,753
30X-6, 80.5–84.5 240.14 1,786.9 2.4 735
31X-2, 124.5–128.5 246.24 26,013.4 6.2 4,192
32X-2, 130–134 255.82 11,800.9 3.9 3,021
33X-1, 127.5–131.5 264.05 6,100.0 5.3 1,148
34X-1, 54.5–58.5 272.82 5,604.5 2.9 1,905
35X-1, 19.5–23.5 281.97 6,952.7 2.5 2,800
36X-1, 19.5–23.5 291.47 7,952.3 0.0
38X-1, 42–46 310.69 4,065.8 0.0
316-C0008B-
1H-1, 137.5–141.5 1.40 18.7 0.0
316-C0008C-
1H-1, 139–143 1.41 24.7 0.0
2H-1, 127–131 6.80 16,474.5 0.0
3H-1, 130–134 16.33 27,087.8 0.0
4H-2, 126–130 26.74 10,334.3 0.0
5H-2, 96.5–100.5 35.38 7,468.0 0.0
6H-1, 126–130 44.79 12,377.5 0.0
7H-2, 126–130 54.94 8,383.5 0.0
9H-2, 64.5–68.5 69.27 5,188.3 0.0
10H-1, 27–31 77.30 3,045.7 0.0
11H-4, 63–67 83.51 8,217.3 0.0
13H-1, 22.5–26.5 91.51 7,295.1 0.0
14H-1, 116–120 98.77 709.6 0.0
15H-1, 23–27 101.94 12,289.6 0.0
16H-1, 75–79 109.06 953.4 0.0
17H-1, 99.5–103.5 115.61 5,515.9 0.0
18H-1, 128–132 121.19 2,926.9 0.0
20H-1, 58–62 129.99 11,492.7 0.0
21H-1, 119.5–123.5 131.32 9,415.7 3.9 2,405
22X-1, 126.5–130.5 140.39 5,997.0 2.7 2,220
23X-1, 107.5–111.5 149.70 11,990.8 6.7 1,782
24X-1, 84–88 158.14 9,147.9 8.7 1,048
25X-1, 54.5–58.5 167.36 3,816.9 11.8 323

Notes: CSF = core depth below seafloor. — = not applicable.

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