|
Core, section,
interval (cm) |
Depth
(mbsf) |
C1
(ppmv) |
CO2
(ppmv) |
C2=
(ppmv) |
C2
(ppmv) |
C3
(ppmv) |
C1/C2
|
|---|---|---|---|---|---|---|---|
| 175-1079A- | |||||||
| 1H-2, 0-5 | 1.50 | 4.2 | 1,002 | ||||
| 1H-4, 0-5 | 4.50 | 3.9 | 1,230 | 0.1 | |||
| 2H-3, 0-5 | 8.30 | 3.8 | 2,741 | ||||
| 3H-4, 0-5 | 19.30 | 8.7 | 5,148 | ||||
| 4H-4, 0-5 | 28.60 | 10.1 | 11,672 | 0.2 | 50 | ||
| 5H-4, 0-5 | 38.10 | 41.8 | 12,002 | 0.7 | 60 | ||
| 6H-4, 0-5 | 47.70 | 37,736 | 13,402 | 0.1 | 8.9 | 0.5 | 4,240 |
| 7H-4, 0-5 | 57.40 | 29,589 | 14,375 | 0.2 | 9.8 | 1.3 | 3,019 |
| 8H-3, 0-5 | 65.30 | 10,851 | 35,672 | 9.8 | 1.8 | 1,107 | |
| 9H-3, 0-5 | 74.80 | 9,080 | 33,264 | 0.1 | 6.8 | 1.5 | 1,335 |
| 10H-5, 0-5 | 86.29 | 8,280 | 37,144 | 0.1 | 6.9 | 2.2 | 1,200 |
| 11H-4, 0-5 | 95.20 | 8,658 | 46,628 | 0.1 | 12.0 | 3.4 | 722 |
| 12H-4, 0-5 | 104.70 | 5,854 | 54,410 | 0.1 | 6.0 | 1.7 | 976 |
| 13H-4, 0-5 | 112.80 | 8,391 | 42,124 | 0.1 | 4.7 | 1.2 | 1,785 |
| 14H-3, 0-5 | 120.10 | 3,101 | 24,281 | 0.1 | 2.8 | 0.8 | 1,108 |
Notes: C1 = methane; CO2 = carbon dioxide; C2= = ethene; C2 = ethane; and C3 = propane. Dominance of C1 over C2 indicates that the gases originate from in situ microbial degradation of organic matter.