Table T19. In situ conditions of PCS cores recovered from Site U1327.
| Core | Depth (mbsf) |
Temperature (°C) |
Pressure (MPa) |
Salinity |
Methane saturation (mM) | |
|---|---|---|---|---|---|---|
| Top | Bottom | |||||
| 311-U1327C- | ||||||
| 15P | 121.8 | 122.8 | 10.4 | 14.3 | 23 | 78.9 |
| 24P | 197.3 | 198.3 | 15.0 | 15.1 | 21 | 120.2 |
| 311-U1327D- | ||||||
| 10P | 155.1 | 156.1 | 12.4 | 14.7 | 21 | 93.8 |
| 17P | 246.0 | 247.0 | 18.0 | 15.6 | 21 | 147.7 |
| 311-U1327E- | ||||||
| 3P | 80.0 | 81.0 | 7.9 | 13.9 | 24 | 65.1 |
Notes: Salinity was analyzed in interstitial water samples from Cores 311-U1327C-15P, 24P, and 311-U1327E-3P (Table T3). For all other cores we used the background salinity for in situ calculations, since interstitial water analysis revealed significant freshening of the pore water caused by hydrate dissociation. Temperature was calculated from sediment depth assuming a seafloor temperature of 2.95°C and a thermal gradient of 61°C/km. Pressure was calculated from sediment and water depth. Methane saturation was calculated based on sediment and water depth, seafloor temperature, thermal gradient, and salinity according to Xu (2002, 2004).
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