|
Core, section,
interval (cm) |
Depth
(mbsf) |
C1
(ppmv)
|
CO2
(ppmv)
|
C2=
(ppmv)
|
C2
(ppmv)
|
C3
(ppmv)
|
C1/C2
|
|---|---|---|---|---|---|---|---|
| 175-1076A- |
|
|
|
|
|
|
|
| 1H-2, 0-5 | 1.50 | 2 |
|
|
|
|
|
| 2H-3, 0-5 | 7.80 | 2 | 12,288 |
|
|
|
|
| 3H-4, 0-5 | 18.80 | 3 |
|
|
|
|
|
| 4H-4, 0-5 | 28.30 | 2,055 |
|
|
0.4 |
|
5,138 |
| 5H-4, 0-5 | 37.80 | 25,623 |
|
|
3.3 |
|
7,765 |
| 6H-4, 0-5 | 47.30 | 37,251 |
|
0.2 | 5.0 | 0.3 | 7,450 |
| 7H-4, 0-5 | 56.80 | 47,483 | 22,727 | 0.3 | 7.6 |
|
6,248 |
| 8H-4, 0-5 | 66.30 | 69,413 |
|
0.4 | 11.0 |
|
6,310 |
| 9H-4, 0-5 | 75.82 | 32,313 |
|
0.3 | 7.6 | 1.2 | 4,252 |
| 10H-4, 0-5 | 85.20 | 25,922 |
|
0.2 | 5.9 | 1.2 | 4,394 |
| 11H-4, 0-5 | 94.70 | 34,361 |
|
0.4 | 9.8 | 2.1 | 3,506 |
| 12H-1, 0-5 | 99.80 | 26,174 | 9,233 | 0.3 | 7.1 | 1.4 | 3,686 |
| 13H-8, 0-5 | 118.70 | 8,967 |
|
0.3 | 3.4 | 0.8 | 2,637 |
| 14H-4, 0-5 | 123.30 | 22,345 |
|
0.4 | 9.8 | 2.8 | 2,280 |
| 15H-7, 0-5 | 137.37 | 10,637 |
|
0.2 | 5.1 | 1.9 | 2,086 |
| 16H-7, 0-5 | 146.80 | 14,768 |
|
0.5 | 7.3 | 3.1 | 2,023 |
| 17H-4, 0-5 | 150.75 | 13,694 | 8,751 | 0.3 | 8.3 | 3.6 | 1,650 |
| 18H-7, 0-5 | 165.80 | 15,642 |
|
0.3 | 8.2 | 3.6 | 1,908 |
| 19H-6, 145-150 | 175.25 | 13,017 |
|
0.3 | 8.0 | 4.0 | 1,627 |
| 20H-3, 0-5 | 178.80 | 11,441 |
|
0.3 | 8.0 | 4.5 | 1,430 |
| 21H-7, 0-5 | 193.24 | 8,936 |
|
0.1 | 5.5 | 2.5 | 1,625 |
| 22H-6, 0-5 | 202.30 | 12,579 | 25,260 | 0.5 | 8.5 | 5.3 | 1,480 |
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.