|
Seamount:
|
Conical*
|
South
Chamorro*
|
Torishima
Forearc
|
Seawater
|
|---|---|---|---|---|
|
ODP Site:
|
780
|
1200
|
783, 784
|
|
| Analyte (mmol/kg): | ||||
| Chloride | 270 ± 20 | 510 ± 5 | 550 ± 5 | 542 |
| Sulfate | 46 ± 1 | 28 ± 1 | 9 ± 3 | 28.0 |
| Alkalinity | 50 ± 10 | 60 ± 5 | 1 ± 0.4 | 2.3 |
| pH | 12.5 ± 0.1 | 12.5 ± 0.1 | 9.6 ± 0.4 | 8.1 |
| Na | 390 ± 10 | 610 ± 10 | 470 ± 20 | 466 |
| Na/Cl (molar) | 1.4 ± 0.1 | 1.2 ± 0.02 | 0.86 ± 0.04 | 0.859 |
| K | 15 ± 0.5 | 19 ± 1 | 5 ± 1 | 10.1 |
| Mg | 0.01 ± 0.007 | <0.01 | 1 ± 1 | 52.4 |
| Ca | 1 ± 0.5 | 0.3 ± 0.1 | 55 ± 5 | 10.2 |
| CH4 | 2 ± 1 | 2 ± 1 | 0 | |
| Analyte (µmol/kg): | ||||
| CH4 | 2 ± 1 | 0 | ||
| Sr | 20 ± 10 | 10 ± 2 | 200 ± 50 | 90 |
| Ba | 0.2 ± 0.1 | 0.4? | 1.6 ± 0.7 | 0.14 |
| Li | 1 ± 0.5 | 0.4 ± 0.1 | 16 ± 5 | 26 |
| B | 3900 ± 100 | 3200 ± 200 | 180 ± 80 | 410 |
| Si | 30 ± 20 | 70 ± 20 | 10 ± 8 | 190 |
| Mn | <0.1 | 0.01 | 0.4 ± 0.2 | 0 |
| Fe | 2 ± 1 | 2 ± 0.5 | 1 ± 0.9 | 0 |
| Phosphate | 0.3 ± 0.3 | 0.2? | Not determined | 2.8 |
| NH3 | 250 ± 20 | 220 ± 10 | 140 ± 20 | 0 |
| HS- | <250 | <250 | 0 | 0 |
| C2H6 | 7 | 2 | 0 | 0 |
| C1/C2 | 270 | 780 | ||
Notes: * = deep upwelling fluid from an active mud volcano (Conical Seamount data from Mottl, 1992; South Chamorro Seamount data from this study). = product of harzburgite-seawater reaction within an inactive mud volcano (Mottl, 1992). = estimated composition of local bottom water. ? = error not known.