Table 1. Sample location, in situ pH and temperature.
| Core | Site | Location | Latitude | Longitude | Water depth (mbsl) | Core length (cmbsf) |
pH in porewatera |
Temperature |
|||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 cmbsf | 6 cmbsf | Core bottom | 0 cmbsf | 6 cmbsf | |||||||
| MUC 8 | Swallow Chimney | CO2 seep with thick pavement | 24°50.838'N | 122°41.992'E | 1362 | 30 | ND (ND) | ND (ND) | ND (ND) | ND | ND |
| Dive 201 PC28 | Abyss Vent | About 1 m off hydrothermal vent | 24°50.781'N | 122°42.027'E | 1382 | 16 | 5.5 (7.1)b | 4.6 (7.4)b | ND (7.1)b | 3.5 | 8 |
| Dive 203 PC8 | Abyss Vent | About 15 m off hydrothermal vent | 24°50.784'N | 122°42.036'E | ∼1380 | 20 | 6.6 (7.6)c | 4.9 (7.7)c | ND (7.7)c | 3.0 | 5.5 |
| MUC 10 | Abyss Vent | About 30 m off hydrothermal vent | 24°50.791'N | 122°42.020'E | 1392 | 26 | ND (7.0) | ND (6.4) | ND (6.2) | ND | ND |
| MUC 23 | — | Hydrothermally unaffected sediment | 24°50.355'N | 122°41.736'E | 1324 | 26 | ND (8.5) | ND (7.8) | ND (7.9) | ND | ND |
Abbreviations: cmbsf, centimeter below the seafloor; mbsl, meter below sea level; ND, not determined.
a
Onboard measurement data of pH are shown in parenthesis.
b
The data were obtained from adjacent core Dive201 PC5.
c
The data were obtained from adjacent core Dive203 PC11.