|
Core, section,
interval (cm) |
Depth
(mbsf) |
C1
(ppmv) |
CO2
(ppmv) |
C2=
(ppmv) |
C2
(ppmv) |
C3
(ppmv) |
C1/C2
|
|---|---|---|---|---|---|---|---|
| 175-1078A- |
|
|
|
|
|
|
|
| 1H-2, 0-5 | 1.50 | 3 | 1,356 |
|
|
|
|
| 1H-5, 0-5 | 6.00 | 12 | 5,365 |
|
0.1 |
|
120 |
| 2H-4, 0-5 | 12.00 | 1,029 | 19,258 |
|
0.4 |
|
2,573 |
| 3H-4, 0-5 | 21.50 | 28,466 | 26,433 |
|
1.3 | 0 | 21,897 |
| 4H-4, 0-5 | 31.00 | 53,024 | 25,891 | 0.2 | 3.0 | 1 | 17,675 |
| 5H-4, 0-5 | 40.43 | 7,128 |
|
|
1.0 | 0 | 7,128 |
| 6H-5, 0-5 | 50.57 | 4,109 | 48,670 |
|
0.7 | 1 | 5,870 |
| 7H-4, 0-5 | 59.42 | 3,825 |
|
0.1 | 0.9 | 1 | 4,250 |
| 8H-4, 0-5 | 68.24 | 2,448 | 33,684 |
|
0.4 | 0 | 6,120 |
| 175-1078B- |
|
|
|
|
|
|
|
| 8H-5, 0-5 | 68.99 | 2,280 |
|
|
0.5 | 0 | 4,560 |
| 9H-4, 0-5 | 76.28 | 9,225 | 78,421 |
|
2.4 | 0 | 3,844 |
| 10H-4, 0-5 | 87.00 | 5,724 |
|
0.2 | 1.0 | 1 | 5,724 |
| 11H-4, 0-5 | 96.65 | 13,220 | 63,710 | 0.3 | 2.9 | 1 | 4,559 |
| 12H-4, 0-5 | 106.10 | 5,836 |
|
|
1.0 | 0 | 5,836 |
| 13H-2, 0-5 | 112.60 | 7,367 | 85,846 | 0.1 | 2.9 | 1 | 2,540 |
| 14H-4, 0-5 | 125.15 | 4,692 |
|
0.1 | 1.5 | 0 | 3,128 |
| 175-1078C- |
|
|
|
|
|
|
|
| 1H-2, 0-5 | 1.50 | 5 |
|
|
|
|
|
| 2H-2, 0-5 | 8.20 | 15 |
|
|
|
|
|
| 3H-2, 0-5 | 17.70 | 16,301 |
|
|
0.9 |
|
18,112 |
| 4H-2, 0-5 | 27.20 | 48,766 |
|
0.2 | 3.0 | 1 | 16,255 |
| 5H-2, 0-5 | 36.60 | 18,749 |
|
0.2 | 2.3 | 2 | 8,152 |
| 6H-2, 0-5 | 46.20 | 8,243 |
|
|
1.6 | 1 | 5,152 |
| 17X-3, 0-5 | 148.90 | 1,883 | 107,628 | 0.4 | 3.3 | 2 | 571 |
| 18X-4, 0-5 | 160.00 | 1,557 | 102,936 | 0.2 | 3.4 | 1 | 458 |
Notes: C1 = methane; CO2 = carbon dioxide; C2= = ethene; C2 = ethane; C3 = propane. Dominance of C1 over C2 indicates that the gases originate from in situ microbial degradation of organic matter.