Table 1.
Chemical composition of basement fluids collected from boreholes 1025C and U1301A.
| 1025C | U1301A | |
|---|---|---|
| Seafloor depth (m) | 2606.2 | 2667.3 |
| Pressure (kPa) | 26,555 | 27,071 |
| Temperature (°C) | 39 | 63 |
| pH | 7.9 | 7.4 |
| DISSOLVED CONSTITUENTS | ||
| Mg2+ (mM) | 29.7 | 1.9 |
| Ca2+ (mM) | 30.4 | 54 |
| Alkalinity (meq/L) | 0.88 | 0.46 |
| NO−3 (μM) | 6.4 | 0.3 |
| NO−2 (μM) | <0.05 | <0.05 |
| NH+4 (μM) | 43 | 103 |
| SO2−4 (mM) | 26.2 | 17.2 |
| Cl− (mM) | 539 | 557 |
| Na+ (mM) | 469 | 471 |
| K+ (mM) | 9.4 | 6.3 |
| Si (μM) | 590 | 1166 |
| PO3−4(μM) | 0.05 | 0.06 |
| Fe3+ (μM) | 1.3 | 0 |
| Fe2+ (μM) | 1.2 | 0.9 |
| Mn2+ (μM) | 1 | 4.1 |
| Mn4+ (μM) | 1.2 | 0.6 |
| DOC (μM) | 22 | 13 |
| H2S (μM) | 0 | 0.17 |