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Table 1 Fluid and free gas chemical data

From: Sulfur and oxygen isotope insights into sulfur cycling in shallow-sea hydrothermal vents, Milos, Greece

  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 -
  1. “-” indicates either no data or not applicable.
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