Table T10. Hydrocarbon gas composition in extracted headspace gas by NaOH-addition gas extraction, Hole C0021B.
|
Core, section, interval (cm) |
Depth (mbsf) |
Headspace gas (ppmv) | C1/(C2 + C3) | Headspace gas (µM) |
δ13C-CH4 (‰ VPDB) |
||||
|---|---|---|---|---|---|---|---|---|---|
| Methane | Ethane | Propane | Methane | Ethane | Propane | ||||
| 338-C0021B- | |||||||||
| 1H-3, 79.5–83.5 | 3.6 | 46 | 0.4 | ND | 124 | 0.01 | 0.06 | ND | — |
| 2H-2, 136.5–140.5 | 81.5 | 10,489 | 2.0 | ND | 5,246 | 2.15 | 0.41 | ND | –74.5 |
| 3H-5, 0–4 | 92.0 | 10,495 | 2.7 | ND | 3,927 | 2.21 | 0.56 | ND | –73.3 |
| 4H-1, 136.5–140.5 | 100.4 | 11,757 | 2.6 | ND | 4,525 | 2.83 | 0.63 | ND | –73.1 |
| 5H-1, 127–131 | 109.8 | 5,898 | 2.2 | ND | 2,650 | 1.00 | 0.38 | ND | –71.1 |
| 6H-2, 122–126 | 119.5 | 11,108 | 4.3 | ND | 2,579 | 2.32 | 0.90 | ND | –72.7 |
| 7H-5, 0–4 | 130.1 | 7,977 | 4.0 | ND | 1,971 | 0.92 | 0.46 | ND | –71.2 |
| 8H-1, 92–96 | 137.9 | 9,202 | 5.2 | ND | 1,759 | 1.07 | 0.61 | ND | –71.1 |
| 9H-1, 93–97 | 147.4 | 9,174 | 9.3 | 0.3 | 957 | 1.32 | 1.34 | 0.043 | –70.6 |
| 10H-7, 28.5–32.5 | 162.0 | 6,611 | 5.0 | ND | 1,329 | 1.29 | 0.97 | ND | –71.7 |
| 13T-2, 44–48 | 177.3 | 6,436 | 12.0 | ND | 535 | 0.69 | 1.29 | ND | –70.6 |
| 14T-1, 136–140 | 186.4 | 7,631 | 18.8 | ND | 405 | 1.71 | 4.22 | ND | –70.3 |
ND = not detected. — = not enough methane to measure δ13C-CH4. VPDB = Vienna Peedee belemnite.
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