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. 2010 Nov 23;1:126. doi: 10.1038/ncomms1124

Table 1. EM compositions of hydrothermal fluids.

  João Menorah Camel Sleepy
  2008 2009 2010 2008 2009 2010 2008 2009 2010 2009
pH 5.52 6.06 5.60 5.52 5.66 5.57 5.50 5.77 5.62 5.90
EM NH4+ (mmol kg−1) 5.17 5.63 4.77 4.68 5.77 6.13 4.52
EM H2S (mmol kg−1) 4.71 3.35 4.60 4.60 2.62 3.28 4.48 3.17 4.32 3.24
EM Na (mmol kg−1) 383 395 391 388 404 296 386 392 395 404
EM K (mmol kg−1) 34.9 34.8 33.0 34.8 36.8 24.9 35.1 34.4 32.1 36.3
EM Ca (mmol kg−1) 25.9 48.7 26.7 26.0 29.4 20.2 25.6 30.6 26.3 27.7
EM Si (mmol kg−1) 14.63 15.11 14.63 14.95 15.85 11.29 14.91 15.57 14.27 16.25
EM Cl (mmol kg−1) 502 477 519 500 475 350 496 478 589 475
EM CO2 (mmol kg−1) 22.28 26.01 25.15 25.08 21.52 25.41 25.82
EM H2 (mmol kg−1) 4.76 4.81 4.99 4.69 4.90 4.82 5.50
EM CH4 (mmol kg−1) 13.68 12.60 13.30 12.52 15.12 13.45 15.55

Hydrothermal fluids collected from four different chimneys in 2008, 2009 and 2010. The chimneys were João, Menorah, Camel and Sleepy. EM hydrothermal fluid compositions have been calculated assuming no Mg in the hydrothermal fluids and 52 mmol per kg Mg in the seawater.