Table T9. Hydrocarbon gas composition in extracted headspace gas by oven-heating 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 | 34 | 0.2 | ND | 142.6 | 0.01 | 0.04 | ND | — |
| 2H-2, 136.5–140.5 | 81.5 | 6,224 | 1.7 | 0.3 | 3,210 | 1.78 | 0.47 | 0.08 | –71.3 |
| 3H-5, 0–4 | 92.0 | 6,645 | 2.3 | 0.3 | 2,487 | 1.84 | 0.65 | 0.09 | –69.7 |
| 4H-1, 136.5–140.5 | 100.4 | 8,153 | 2.2 | ND | 3,752 | 2.71 | 0.72 | ND | –71.9 |
| 5H-1, 127–131 | 109.8 | 5,311 | 2.6 | 0.3 | 1,831 | 1.15 | 0.56 | 0.07 | –71.7 |
| 6H-2, 122–126 | 119.5 | 7,532 | 3.2 | ND | 2,323 | 2.26 | 0.97 | ND | –72.2 |
| 7H-5, 0–4 | 130.1 | 10,554 | 5.3 | 0.3 | 1,901 | 2.07 | 1.04 | 0.05 | –73.1 |
| 8H-1, 92–96 | 137.9 | 10,593 | 6.6 | 0.3 | 1,523 | 2.17 | 1.36 | 0.06 | –72.5 |
| 9H-1, 93–97 | 147.4 | 14,653 | 10.6 | 0.3 | 1,338 | 2.85 | 2.06 | 0.07 | –73.5 |
| 10H-7, 28.5–32.5 | 162.0 | 8,507 | 6.1 | ND | 1,400 | 2.05 | 1.47 | ND | –72.2 |
| 13T-2, 44–48 | 177.3 | 6,028 | 15.6 | 0.4 | 376 | 0.75 | 1.94 | 0.05 | –70.5 |
| 14T-1, 136–140 | 186.4 | 3,473 | 12.1 | ND | 286 | 1.15 | 4.03 | ND | –68.0 |
ND = not detected. — = not enough methane to measure δ13C-CH4. VPDB = Vienna Peedee belemnite.
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