Table 2. Oxygen isotopic composition (
SMOW)
of gas hydrate waters from Sites 994 and 997.
| Core, section | Laboratory sample no. |
Depth (mbsf) |
Measured 18O of H2O( SMOW) |
[Cl-]
of H2O (mM) |
[Cl-]
of pristine pore water (mM) |
18O
of pristine pore water ( SMOW) |
Mole
fraction of gas hydrate water |
18O
of gas hydrate water ( SMOW) |
|---|---|---|---|---|---|---|---|---|
164-994C- |
||||||||
31X-7 |
2A |
259.90 |
2.6 |
17 |
505 |
-0.4 |
0.966 |
2.7 |
164-997A- |
||||||||
42X-3 |
14 |
330.15 |
2.7 |
20 |
509 |
-0.5 |
0.961 |
2.8 |
42X-3 |
16A |
330.25 |
3.3 |
5 |
509 |
-0.5 |
0.990 |
3.3 |
42X-3 |
16B |
330.25 |
3.2 |
41 |
509 |
-0.5 |
0.919 |
3.5 |
42X-3 |
16C |
330.30 |
2.7 |
62 |
509 |
-0.5 |
0.878 |
3.2 |
Note: Measured 18O
values were corrected for contamination by the pristine pore water using the
baseline values of chloride concentration (Cl- mM; Fig.
5) and 18O
values (Fig. 2).