|
Core, section,
interval (cm) |
Depth
(mbsf) |
C1
(ppmv) |
CO2
(ppmv) |
C2=
(ppmv) |
C2
(ppmv) |
C3=
(ppmv) |
C3
(ppmv) |
C1/C2
|
|---|---|---|---|---|---|---|---|---|
| 175-1077A- |
|
|
|
|
|
|
|
|
| 1H-2, 0-5 | 1.50 | 6 | 1,011 |
|
|
|
|
|
| 1H-3, 145-150 | 3.00 | 9.6 |
|
|
|
|
|
|
| 2H-4, 0-5 | 9.50 | 102 |
|
|
0.2 |
|
|
510 |
| 3H-4, 0-5 | 28.50 | 334 |
|
|
0.3 |
|
|
1,113 |
| 4H-4, 0-5 | 38.00 | 10,271 | 21,096 |
|
1.4 |
|
|
7,336 |
| 5H-4, 0-5 | 47.50 | 18,458 |
|
0.2 | 1.9 |
|
|
9,715 |
| 6H-4, 0-5 | 57.04 | 30,241 |
|
0.2 | 3.5 |
|
|
8,640 |
| 7H-4, 0-5 | 66.50 | 54,717 |
|
0.2 | 5.8 |
|
1 | 9,434 |
| 8H-4, 0-5 | 76.00 | 37,234 | 18,403 | 0.2 | 4.2 |
|
1 | 8,865 |
| 9H-4, 0-5 | 85.10 | 48,443 |
|
0.2 | 5.8 |
|
1 | 8,352 |
| 10H-4, 0-5 | 94.80 | 47,700 |
|
0.3 | 5.9 |
|
1 | 8,085 |
| 11H-4, 0-5 | 109.00 | 44,095 |
|
0.2 | 5.7 |
|
1 | 7,736 |
| 12H-7, 0-5 | 118.50 | 34,920 | 22,576 | 0.2 | 5.5 |
|
1 | 6,349 |
| 13H-7, 0-5 | 123.40 | 27,645 |
|
0.1 | 4.9 |
|
1 | 5,642 |
| 14H-4, 0-5 | 137.50 | 16,398 |
|
0.3 | 3.5 |
|
|
4,685 |
| 15H-7, 0-5 | 147.00 | 38,264 |
|
0.2 | 7.1 |
|
2 | 5,389 |
| 16H-7, 0-5 | 151.90 | 26,687 | 17,868 | 0.1 | 6.1 | 0.04 | 2 | 4,375 |
| 17H-4, 0-5 | 151.90 | 44,860 |
|
0.4 | 9.3 |
|
2 | 4,824 |
| 18H-7, 0-5 | 166.00 | 15,168 |
|
0.04 | 4.3 | 0.04 | 1 | 3,527 |
| 19H-7, 0-5 | 175.50 | 12,331 | 15,605 | 0.09 | 2.9 |
|
1 | 4,252 |
| 20H-3, 0-5 | 178.90 | 24,069 |
|
0.21 | 6.3 |
|
1 | 3,820 |
| 21H-7, 0-5 | 194.50 | 8,548 |
|
|
2.3 |
|
0 | 3,717 |
| 22H-7, 0-5 | 203.90 | 8,568 | 18,126 | 0.05 | 2.8 |
|
1 | 3,060 |
| 175-1077B- |
|
|
|
|
|
|
|
|
| 12H-3, 0-5 | 103.74 | 10,954 | 8,313 | 0.2 | 2.3 |
|
|
4,763 |
| 12H-5, 0-5 | 106.85 | 27,946 |
|
0.3 | 5.3 |
|
|
5,273 |
| 12H-7, 0-5 | 110.02 | 19,356 |
|
0.2 | 3.3 |
|
|
5,865 |
| 13H-3, 0-5 | 112.94 | 10,992 | 11,068 | 0.4 | 2.8 |
|
1 | 3,926 |
| 13H-5, 0-5 | 115.91 | 13,670 |
|
0.5 | 3.3 |
|
1 | 4,142 |
| 13H-7, 0-5 | 118.95 | 40,694 | 16,932 | 0.3 | 6.5 |
|
1 | 6,261 |
| 14H-3, 0-5 | 121.32 | 7,116 |
|
0.3 | 1.8 |
|
0 | 3,953 |
| 14H-5, 0-5 | 124.19 | 15,126 |
|
0.8 | 4.4 |
|
1 | 3,438 |
| 14H-7, 0-5 | 127.13 | 34,809 | 21,493 | 0.5 | 7.6 |
|
2 | 4,580 |
Notes: C1 = methane; CO2 = carbon dioxide; C2= = ethene; C2 = ethane; C3= = propene; and C3 = propane. Dominance of C1 over C2 indicates that the gases originate from in situ microbial degradation of organic matter.