Table 1.
Characteristics of fluid samples collected from Holes 1025C, 1026B, U1301A, and background bottom seawater.
| 1025Ca | 1026Ba | U1301Ab | Bottom seawaterb | |
|---|---|---|---|---|
| Clone prefix | 1025C10 | 1026B10 | 1301AXXc | 1301AXXswc |
| Sampling depth (m) | 2606 + 101 + 46d | 2658 + 247 + 48d | 2667 + 262 + 108d | |
| Sampling temp (°C) | 15 | 4 | 18 | n.d. |
| pH | 7.9 | 6.8 (7.6)e | 7.4 | 7.7 |
| O2 (μM) | 18 | 88 | 10 | 80 |
| Ca2+ (mM) | 30.4 (34.1) | 12.0 (55.8)e | 53.0 | 10.4 |
| Mg2+ (mM) | 29.7 (25.2) | 48.5 (2.7)e | 3.40 | 53.7 |
| K+ (mM) | 9.4 (9.2) | 9.6 (6.5)e | 6.4 | 10.2 |
| CH4 (μM) | 5.3 (6.3) | n.d. (2.0)b | 1.5 | 0.0002f |
| H2 (μM) | n.d. (n.d.) | n.d. (0.7)b | 0.3–2 | 0.0004f |
| NH+4 (μM) | 43 (51) | 2.5 (122)e | 100 | <0.05 |
| PO3-4 (μM) | 0.10 (0) | <0.01 (0.9)g | 0.14 | 2.89 |
| NO−12+ NO2-3 (μM) | 6.4 (0) | 40.6 (0) | 1.5 | 40.8 |
| SO2-4 (mM) | 26.2 (25.9) | 27.2 (17.7)e | 18.3 | 28.4 |
| Fe2+ (μM) | 1.23 (1.46) | 1000 | 1.5 | <0.1 |
| Dissolved Fe (μM) | 1.39 (1.65) | 1130 (1.1)g | 3.15 | <0.1 |
| Total Fe (μM) | 39.07 (46.4) | 1360 | 3.52 | <0.1 |
| DOC (μM) | 22 (19) | 43 (8–17)h | 12 | 39 |
| Alkalinity (meq/L) | 0.88 (0.58) | 0.36 (0.53)e | 0.52 | 2.48 |
All chemical data was collected in 2010 unless otherwise noted.
a
For some parameters, corrected values representing end-member fluids (nitrate = 0 μM) appear in parentheses.
b
Geochemical data from Lin et al. (2012).
c
Jungbluth et al. (2013).
d
Water column depth at CORK sampling spigot + sediment + permeated basement rock.
e
Cowen et al. (2003).
f
Kelley et al. (1998).
g
Wheat et al. (2004).
h
Lang et al. (2006).
n.d., not determined.