|
Core, section
|
Depth (mbsf)
|
DGH media supplement
|
Headspace methane (ppm) measured over time of incubation
|
||||
|---|---|---|---|---|---|---|---|
|
1 month
|
2 months
|
3 months
|
16 months
|
2 yr
|
|||
| 201-1230A- |
|
|
|
|
|
|
|
| 1H-1 | 1.02 | Acetate | 1.26 | – | 1.38 | – | – |
|
|
|
Methanol | 0.93 | 1.25 | – | 1.38 | 1.36 |
|
|
|
Trimethylamine | – | 1.49 | 1.26 | 1.25 | 1.29 |
|
|
|
CO2 | 0.61 | 0.81 | 0.89 | 1.02 | – |
| 4H-5 | 30.4 | Acetate | – | 1.35 | 1.43 | 2.53 | 2.76 |
|
|
|
Methanol | – | 1.41 | 2.06 | 2.02 | – |
|
|
|
Trimethylamine | – | 1.03 | 1.22 | 1.25 | 0.98 |
|
|
|
CO2 | – | 0.74 | 1.07 | – | – |
| 13H-3 | 102.3 | Acetate | – | 2.88 | – | – | 3.54 |
|
|
|
Methanol | – |
|
– | – | – |
|
|
|
Trimethylamine | – | 1.86 | – | – | 3.33 |
|
|
|
CO2 | – | 3.95 | – | – | 5.32 |
| 37X-1 | 258.3 | Acetate | 1.02 | – | – | 1.45 | 1.61 |
|
|
|
Methanol | 0.7 | – | – | 1.27 | 1.36 |
|
|
|
Trimethylamine | 0.75 | – | – | 1.16 | 1.26 |
|
|
|
CO2 | – | – | – | 0.75 | 0.88 |
Notes: Headspace methane was measured by gas chromatography. Measurements were made in duplicate and averaged. All values were below the concentration of methane released from sediment. DGH = basal anaerobic marine salts media. – = none detected.