|
Core, section,
interval (cm) |
Depth
(mbsf) |
C1
(ppmv) |
CO2
(ppmv) |
C2=
(ppmv) |
C2
(ppmv) |
C3
(ppmv) |
C1/C2
|
|---|---|---|---|---|---|---|---|
| 175-1083A- | |||||||
| 2H-2, 0-5 | 3.30 | 5 | 5,121 |
|
|
|
|
| 2H-4, 0-5 | 6.30 | 26 | 16,071 | 0.2 |
|
|
|
| 3H-3, 0-5 | 14.30 | 61 | 27,113 |
|
|
|
|
| 5H-4, 0-5 | 34.70 | 361 | 18,293 |
|
0.3 |
|
1,203 |
| 6H-2, 0-5 | 41.30 | 3,515 | 36,497 |
|
0.6 |
|
5,858 |
| 7H-4, 0-5 | 53.70 | 19,076 | 48,028 | 0.2 | 1.6 |
|
11,923 |
| 8H-4, 0-5 | 63.20 | 28,291 | 48,559 |
|
2.1 |
|
13,472 |
| 9H-4, 0-5 | 72.70 | 24,252 | 36,067 |
|
1.4 |
|
17,323 |
| 10H-4, 0-5 | 82.20 | 28,051 | 34,555 |
|
1.4 |
|
20,036 |
| 11H-3, 0-5 | 90.38 | 22,643 | 42,886 | 0.2 | 1.8 |
|
12,579 |
| 12H-4, 0-5 | 101.20 | 40,802 | 43,449 |
|
2.3 |
|
17,740 |
| 13H-6, 0-5 | 113.80 | 40,947 | 47,847 |
|
3.5 | 2.0 | 11,699 |
| 14H-6, 0-5 | 123.30 | 52,926 | 54,602 | 0.2 | 3.7 | 1.8 | 14,304 |
| 15H-4, 0-5 | 129.70 | 36,787 | 45,559 | 0.3 | 2.9 | 1.1 | 12,685 |
| 16H-7, 0-5 | 143.80 | 22,873 | 24,091 |
|
1.5 | 0.6 | 15,249 |
| 17H-6, 0-5 | 151.80 | 43,376 | 50,258 |
|
3.6 | 1.7 | 12,049 |
| 18H-4, 0-5 | 158.20 | 34,566 | 45,254 | 0.2 | 2.7 | 0.9 | 12,802 |
| 19H-7, 0-5 | 172.30 | 41,007 | 40,885 | 0.7 | 3.1 | 1.1 | 13,228 |
| 20H-7, 0-5 | 181.80 | 36,912 | 38,956 | 0.2 | 3.5 | 2.0 | 10,546 |
| 21H-4, 0-5 | 186.80 | 9,063 | 36,686 |
|
1.0 | 0.5 | 9,063 |
| 22H-7, 0-5 | 200.80 | 40,915 | 37,008 | 0.2 | 3.4 | 1.6 | 12,034 |
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.