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Table 45.2 End-member compositions of volatile components in the hydrothermal fluids for all the sites in the Southern Mariana Trough in this study

From: Chemical and Isotopic Compositions of Hydrothermal Fluids at Snail, Archaean, Pika, and Urashima Sites in the Southern Mariana Trough

Site Tmax H2S (μM) ΔH2S (μM) O2 (μM) N2 (μM) CO2 (mM) ΔCO2 (mM) CH4 (μM) ΔCH4 (μM) H2 (μM) He (μM) ΔHe (μM) δ13C(CO2) (‰VPDB) Δδ13C(CO2) (‰VPDB) δ13C(CH4) (‰VPDB) δD(H2) (‰VSMOW) δD(CH4) (‰VSMOW) 3He/4He (RA) Δ3He/4He(RA)
Snail 116    N.D. N.D. 78.8 ±12.4 29.6 ±5.1 N.D. N.D. N.D. −1.33 ±0.10 N.D. N.D. N.D. 8.15 ±0.09
Archaean 343    N.D. N.D. N.D. N.D. N.D. N.D. N.D. 2.10   −2.00 ±0.61 N.D. N.D. N.D. 8.37 ±0.03
 2004                    
 2005–2010                    
Pika 330    N.D. N.D. 33.7 ±0.6 7.2 ±0.2 N.D. 1.83 ±0.08 0.14 ±0.06 N.D. N.D. N.D. 8.27 ±0.10
 2005       69.1 ±2.1 29.9 ±2.0           
Urashima 280 883 ±43 N.D. N.D. 23.2 ±0.4 10.8 ±0.3 N.D. 2.40 ±0.1 −2.36 ±0.17 N.D. N.D. N.D. 8.09 ±0.19
  1. N.D. not determined