Table T24. Mass balance calculations based on degassing experiments, Site U1328.
| Core |
Depth (mbsf) |
Total C1 released (10–3 mole) |
C1 concentration (mM) |
In situ nondissolved C1 as percentage of pore volume if present as |
Potential pore water freshening caused by gas hydrate decomposition |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Water release (mL) |
Freshening (%) |
|||||||||||
| Total | At laboratory conditions | In situ | ||||||||||
| Top | Bottom | Dissolved* | Free† | Dissolved‡ | Nondissolved | Free gas | Gas hydrate | |||||
| 311-U1328B- | ||||||||||||
| 4P | 14.5 | 15.5 | 955 | 1140 | 2.2 | 1138 | 50.2 | 1090 | 19.5 | 14.9 | 99 | 12 |
| 7P | 26.0 | 27.0 | 135 | 190 | 2.1 | 188 | 52.6 | 137 | 2.4 | 1.9 | 11 | 1.5 |
| 311-U1328C- | ||||||||||||
| 5P | 92.0 | 93.0 | 92.3 | 123 | 2.7 | 121 | 68.3 | 54.9 | 0.9 | 0.7 | 4.5 | 0.6 |
| 311-U1328E- | ||||||||||||
| 10P | 92.0 | 93.0 | 781 | 2858 | 2.7 | 2855 | 68.3 | 2790 | 47.7 | 38.0 | 82 | 30 |
| 13P | 233.0 | 234.0 | 2612 | 3775 | 1.5 | 3773 | 142.3 | 3633 | 58.1 | 49.5 | 272 | 56 |
Notes: * = obtained by HS analysis of extruded sediment core (Table T6). † = calculated based on the total amount of C1 released during the degassing experiment and the pore water volume recovered by the PCS. ‡ = methane saturation of pore water (Table T21).
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