Methane, ethane and total inorganic carbon in fluid samples taken during the 1989 Kaiko-Nankai project

Details Methane, ethane and total inorganic carbon in fluid samples taken during the 1989 Kaiko-Nankai project Methane, ethane and total inorganic carbon in fluid samples taken during the 1989 Kaiko-Nankai project

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..383g&link_type=abstract

Earth and Planetary Science Letters, Volume 109, Issue 3, p. 383-390.

Computer Science

3

Scientific paper

Water samples collected by the French submersibleNautile from macrofauna flourishing in cold seepage zones of the eastern Nankai Trough accretionary prism were analyzed for major chemical components on boardNadir and in shore-based laboratories in order to characterize pore fluid chemistries. Extremely high CH4 concentrations of up to 4.01 μM confirmed the active supply of CH4-rich fluids from the bottom. TheCH4/C2H6 ratio ranged from 113 to 3875, suggesting a biogenic rather than thermogenic origin of the hydrocarbons. It was inferred that the oxidation of biogenic CH4 occurs in surface sediments at a rate that is approximately twice as fast as that of C2H6, based on the positive correlation between CH4 concentrations and (CH4/C2H6) ratios. The existence of NH4+ (10-50 μM) and high alkalinity values ( > 3 mM) in some water samples were indicative of microbial organic matter decomposition (sulfate reduction and/or methane generation) in the sediments. By extrapolating theΣCO2-δ13C(ΣCO2) relationship,δ13C(ΣCO2) of an unknown fluid end member was estimated to range from -30 to -47‰, indicating a contribution of CH4-derived CO2 with lowδ13C values.

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