Table T2. Summary of thermal gradients and heat flow observed at southern Hydrate Ridge sites.
|
Site
|
Water
depth (m) |
Number of
To estimates (total number of attempts) |
R2
|
Thermal
gradient (°C/km) |
Seafloor
intercept (°C) |
Apparent
standard error (°C) |
Average
thermal conductivity (W/[m·K]) |
Heat flow
(mW/m2) |
|---|---|---|---|---|---|---|---|---|
| 1244 | 895 | 13 (13) | 1 | 62 ± 1 | 3.9 ± 0.1 | 0.12 | 0.93 ± 0.07 | 58 ± 5 |
| 1245 | 871 | 9 (12) | 1 | 54 ± 1 | 4.1 ± 0.2 | 0.22 | 0.98 ± 0.05 | 54 ± 4 |
| 1246 | 851 | 5 (5) | 0.95 | 55 ± 7 | 4.8 ± 0.5 | 0.46 | 0.93 ± 0.07 | 51 ± 10 |
| 1247 | 830 | 5 (7) | 1 | 53 ± 1 | 4.2 ± 0.1 | 0.08 | 0.96 ± 0.07 | 51 ± 5 |
| 1248 | 830 | 4 (6) | 1 | 54 ± 1 | 4.2 ± 0.1 | 0.04 | 0.98 ± 0.07 | 53 ± 5 |
| 1249 | 780 | 8 (2) | 0.98 | 59 ± 3 | 4.3 ± 0.3 | 0.18 | 0.93 ± 0.07 | 55 ± 7 |
| 1249 | 780 | 5 (>40 mbsf) | 0.98 | 56 ± 5 | 4.0 ± 0.2 | 0.18 | 0.93 ± 0.07 | 52 ± 9 |
| 1250 | 790 | 12 (13) | 0.98 | 59 ± 2 | 4.0 ± 0.2 | 0.27 | 0.94 ± 0.07 | 55 ± 6 |
| 1250 | 790 | 9 (APCT only) | 0.99 | 53 ± 2 | 4.2 ± 0.1 | 0.12 | 0.94 ± 0.07 | 50 ± 6 |
| 1249/1250 |
|
21 (23) | 0.97 | 58 ± 2 | 4.1 ± 0.1 | 0.22 | 0.94 ± 0.06 | 55 ± 5 |
| 1251 | 1212 | 7 (9) | 1 | 54 ± 1 | 4.0 ± 0.1 | 0.2 | 0.83/0.95 | 52 ± 8 |
| 1252 | 1040 | 5 (6) | 1 | 57 ± 1 | 3.5 ± 0.1 | 0.07 | 0.84/0.93 | 53 ± 6 |
| 1251/1252 | All | 12 | 1 | 54 ± 1 | 4.1 ± 0.1 | 0.17 | 0.90 ± 0.14 | 49 ± 11 |
| 1251/1252 | <100 mbsf | 7 | 0.99 | 58 ± 2 | 3.8 ± 0.2 | 0.14 | 0.83 ± 0.07 | 48 ± 6 |
| 1251/1252 | >100 mbsf | 5 | 1 | 52 ± 1 | 4.4 ± 0.2 | 0.16 | 0.94 ± 0.06 | 49 ± 4 |
Note: APCT = advanced piston corer temperature tool.