Table T22. Mass balance calculations based on degassing experiments, Site U1327.
| 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-U1327C- | ||||||||||||
| 15P | 121.8 | 122.8 | 67 | 96 | 2.4 | 94 | 78.9 | 17 | 0.3 | 0.2 | 1.3 | 0.2 |
| 24P | 197.3 | 198.3 | 182 | 253 | 1.2 | 251 | 120.2 | 133 | 2.1 | 1.8 | 10 | 1.4 |
| 311-U1327D- | ||||||||||||
| 10P | 155.1 | 156.1 | 453 | 674 | 1.4 | 673 | 93.8 | 580 | 9.4 | 7.9 | 42 | 6.3 |
| 17P | 246.0 | 247.0 | 160 | 209 | 1.1 | 208 | 147.7 | 61 | 1.0 | 0.8 | 5.1 | 0.7 |
| 311-U1327E- | ||||||||||||
| 3P | 80.0 | 81.0 | 58 | 83 | 1.7 | 81 | 65.1 | 18 | 0.3 | 0.2 | 1.4 | 0.2 |
Notes: * = obtained by HS analysis of extruded sediment except for Core 311-U1327C-15P, where data was extrapolated from adjacent XCB cores (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 (Table T20).
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