Table 1 Fluid and free gas chemical data
Depth (cm) | pH | Temp. (°C) | Cl (mM) | SO4(mM) | H2S(μM) | δ34SSO4(‰) | δ18OSO4(‰) | δ34SH2S(‰) | |
|---|---|---|---|---|---|---|---|---|---|
Seawater | |||||||||
Near shore, surface water | - | 7.91 | 22.1 | 620 | 32.5 | - | 21.2 | 9.0 | 0.0 |
Twinkie site, bottom water | - | - | - | - | - | - | 21.8 | 9.1 | - |
Brine pool | |||||||||
Brine pool west of beach | - | 6.30 | 46.8 | 912 | 19.4 | 0.0 | 19.9 | 9.0 | - |
Free gas | |||||||||
Vent area, Twinkie site | - | - | - | - | - | - | - | - | 2.7 |
- | - | - | - | - | - | - | - | 2.1 | |
- | - | - | - | - | - | - | - | 2.8 | |
Rocky Point | - | - | - | - | - | - | - | - | 2.4 |
Pore water | |||||||||
Rocky Point (RP) | |||||||||
Orange center | 10 | 4.38 | 88.6 | 929 | 8.7 | 92.0 | - | - | - |
20 | 4.02 | 92.5 | 890 | 7.9 | 109.0 | - | - | - | |
White area | 10 | 5.32 | 67.9 | 745 | 20.8 | 257.0 | 21.2 | - | 2.7 |
20 | 5.33 | 79.4 | 731 | 20.8 | 246.0 | 21.9 | - | 2.9 | |
White area | 10 | 5.19 | 61.3 | 718 | 25.5 | 198.0 | 20.2 | - | 2.6 |
20 | 5.21 | 68.0 | 734 | 25.9 | 186.0 | 20.7 | - | 2.7 | |
Orange/Yellow area | 5 | 4.13 | 87.5 | 944 | 8.3 | 24.0 | 17.3 | 9.0 | - |
15 | 4.12 | 97.4 | 952 | 8.8 | 18.0 | 17.6 | 9.1 | - | |
Spiegelei (SE) | |||||||||
Orange/Yellow center | 5 | 4.94 | 79.6 | 960 | 22.0 | 9.0 | 18.2 | 9.4 | 2.9 |
15 | 4.29 | 90.4 | 937 | 17.3 | 81.0 | 17.9 | 9.6 | 2.0 | |
White outer area | 5 | 5.21 | 76.5 | 884 | 17.6 | 9.0 | 20.1 | 9.3 | 1.9 |
15 | 5.31 | 83.3 | 871 | 17.2 | 34.0 | 20.5 | 9.5 | 2.7 | |
Gray fringe | 5 | 5.72 | 28.3 | 788 | 21.6 | 0.0 | 21.0 | 9.7 | - |
15 | 5.73 | 41.4 | 796 | 21.9 | 0.0 | 21.3 | 9.7 | - | |
Twinkie (TW), west side of transect | |||||||||
Yellow/White center | 5 | 5.34 | 52.8 | 561 | 27.5 | 253.0 | 21.3 | 8.7 | 2.2 |
10 | - | 64.3 | - | - | - | - | - | - | |
15 | 5.42 | 69.6 | 563 | 29.9 | 286.0 | 20.4 | 8.9 | - | |
20 | - | 71.5 | - | - | - | - | - | - | |
White area near edge | 5 | 5.26 | 42.6 | 620 | 31.7 | 231.0 | 21.7 | 8.8 | 2.3 |
10 | - | 51.7 | - | - | - | - | - | - | |
15 | 5.29 | 58.4 | 639 | 32.9 | 227.0 | 21.4 | 8.8 | 2.7 | |
20 | - | 62.7 | - | - | - | - | - | - | |
Gray area near edge | 5 | 5.24 | 33.5 | 633 | 35.3 | 247.0 | 21.6 | 9.1 | 3.3 |
10 | - | 39.9 | - | - | - | - | - | - | |
15 | 5.20 | 45.5 | 630 | 32.7 | 239.0 | 21.6 | 9.1 | 3.2 | |
20 | - | 49.6 | - | - | - | - | - | - | |
Twinkie (TW), east side of transect | |||||||||
Yellow/White center | 5 | 5.22 | 48.1 | 586 | 29.5 | 95.0 | 21.3 | 8.9 | 2.8 |
15 | 5.18 | 67.8 | 583 | 29.3 | 129.0 | 21.3 | 8.9 | 2.8 | |
White area near edge | 5 | 5.22 | 40.3 | 604 | 30.6 | 82.0 | 21.6 | 8.2 | 2.6 |
15 | 5.22 | 60.0 | 613 | 31.2 | 134.0 | 21.5 | 8.8 | 3.0 | |
Gray area near edge | 5 | 5.22 | 30.7 | 628 | 32.5 | 114.0 | 21.0 | 8.8 | 3.1 |
15 | 5.21 | 46.7 | 634 | 33.2 | 127.0 | 21.6 | 9.0 | 2.6 | |
Twinkie (TW), north of transect | |||||||||
White area | 5 | 4.98 | 42.3 | 544 | 26.5 | 606.0 | 21.1 | 8.6 | 2.6 |
15 | 4.98 | 60.5 | 529 | 26.2 | 992.0 | 21.5 | 8.6 | 2.5 | |
Control (north of TW) | |||||||||
Background mud | 5 | 7.45 | 22.1 | 638 | 32.8 | 6.0 | 21.2 | 8.6 | - |
15 | 7.36 | 23.0 | 640 | 33.0 | 42.0 | 21.0 | 8.5 | - | |