Table T18. Headspace gas composition for safety monitoring in sediments, C0004. (See table notes.)
| Core, section, interval (cm) |
Depth CSF (m) |
Headspace gas (ppmv) | C1/C2 | |
|---|---|---|---|---|
| Methane | Ethane | |||
| 316-C0004C- | ||||
| 1H-1, 137.5–141.5 | 1.38 | 3.2 | 0.0 | — |
| 2H-1, 136.7–140.7 | 7.75 | 21.2 | 0.0 | — |
| 3H-1, 137.3–141.3 | 17.25 | 1,836.4 | 3.1 | 587 |
| 4H-1, 137.5–141.5 | 26.76 | 29,260.9 | 10.5 | 2,786 |
| 5H-1, 138.5–142.5 | 36.27 | 29,748.1 | 10.8 | 2,757 |
| 6H-1, 138.5–142.5 | 45.77 | 16,849.7 | 6.5 | 2,610 |
| 7H-1, 137.7–141.7 | 55.26 | 20,514.7 | 8.4 | 2,453 |
| 8H-1, 136–140 | 64.74 | 12,610.8 | 6.5 | 1,936 |
| 9H-1, 137.2–141.2 | 74.25 | 8,227.4 | 4.6 | 1,774 |
| 10H-1, 139.5–143.5 | 82.24 | 8,141.4 | 6.0 | 1,355 |
| 11H-1, 137–141 | 86.17 | 5,003.7 | 4.4 | 1,128 |
| 12X-1, 114–118 | 90.36 | 5,777.5 | 6.0 | 966 |
| 13X-1, 137–141 | 100.09 | 3,721.5 | 4.5 | 832 |
| 14X-1, 136.5–140.5 | 109.59 | 19,449.1 | 11.7 | 1,661 |
| 15X-1, 137–141 | 119.09 | 11,495.2 | 9.4 | 1,217 |
| 16H-1, 116.5–120.5 | 128.39 | 2,873.4 | 5.2 | 555 |
| 316-C0004D- | ||||
| 5R-1, 128–132 | 138.78 | 5,477.2 | 5.5 | 998 |
| 7R-1, 136.5–140.5 | 152.87 | 7,370.3 | 5.5 | 1,329 |
| 8R-1, 133–137 | 157.33 | 4,050.6 | 3.3 | 1,241 |
| 11R-1, 105–109 | 170.55 | 6,269.2 | 6.5 | 958 |
| 16R-1, 108.5–112.5 | 203.09 | 2,995.9 | 2.1 | 1,448 |
| 19R-1, 111.5–115.5 | 226.62 | 5,839.7 | 4.6 | 1,266 |
| 23R-1, 137–141 | 248.37 | 2,639.9 | 2.9 | 903 |
| 24R-1, 136.5–140.5 | 252.87 | 2,083.2 | 2.2 | 941 |
| 28R-1, 137–141 | 270.87 | 5,103.1 | 4.3 | 1,198 |
| 29R-1, 135.5–139.5 | 275.36 | 15,386.8 | 5.6 | 2,732 |
| 30R-1, 137.2–141.2 | 279.87 | 10,187.5 | 4.4 | 2,333 |
| 31R-1, 137–141 | 284.37 | 9,991.6 | 4.8 | 2,067 |
| 32R-2, 136–140 | 290.27 | 10,557.7 | 4.1 | 2,555 |
| 33R-1, 136–140 | 293.36 | 4,721.9 | 2.5 | 1,870 |
| 34R-1, 134.5–140.5 | 297.85 | 11,432.1 | 4.9 | 2,353 |
| 35R-1, 134.5–140.5 | 302.35 | 7,295.8 | 4.0 | 1,832 |
| 36R-1, 113–119 | 306.63 | 4,245.8 | 3.5 | 1,198 |
| 37R-1, 133–141 | 311.33 | 4,062.8 | 2.7 | 1,510 |
| 39R-1, 105.5–109.5 | 320.06 | 5,654.4 | 5.7 | 998 |
| 41R-1, 136–140 | 329.36 | 2,460.5 | 2.7 | 903 |
| 42R-1, 136–140 | 333.86 | 4,888.3 | 4.9 | 991 |
| 45R-1, 137–141 | 347.37 | 3,932.6 | 2.8 | 1,409 |
| 47R-1, 137.2–141.2 | 356.37 | 4,038.4 | 1.9 | 2,089 |
| 49R-1, 137.5–141.5 | 365.38 | 5,678.0 | 3.5 | 1,626 |
| 51R-1, 137.5–141.5 | 373.14 | 3,437.0 | 2.8 | 1,235 |
| 54R-1, 136–140 | 387.86 | 4,725.8 | 2.6 | 1,805 |
Notes: CSF = core depth below seafloor. — = not applicable.
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