Peculiar features of Suiyo Seamount hydrothermal fluids, Izu-Bonin Arc: Differences from subaerial volcanism

Details Peculiar features of Suiyo Seamount hydrothermal fluids, Izu-Bonin Arc: Differences from subaerial volcanism Peculiar features of Suiyo Seamount hydrothermal fluids, Izu-Bonin Arc: Differences from subaerial volcanism

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.126..289t&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 126, no. 4, p. 289-301

Other

9

Carbon Dioxide, Deep Water, Gas Composition, Helium Isotopes, Hydrothermal Systems, Magma, Methane, Chemical Composition, Geothermal Resources, Volcanology

Scientific paper

This is the first report of the dissolved gas composition of a deep-sea venting hydrothermal system originating from arc volcanism; the origin of dissolved gases in hydrothermal fluids from the Suiyo Seamount in the southern Izu-Bonin (Ogasawara) Arc is discussed on the basis of chemical and isotopic compositions. Twleve high-temperature (up to 310 C) fluid samples were collected from three vents of the hydrothermal system using the submersible Shinkai 2000. The average He-3/He-4 ratio of the dissolved He is 8.1 (R/R(sub atm), which is within the range of values reported for N-MORB. The CO2/He-3 ratio is 12 x 10(exp 9) which is within the range of arc volcanic gas values. The delta (C-13) values of CO2 and CH4 are -1 and -8.5/mil respectively, which is quite high compared with other subaerial arc volcanic gases and those from mid-ocean ridges. These results, which do not accord with those from subaerial volcanism, are unlikely to result from fractionation or addition of carbon sources during the fluid circulation, but are regarded as characteristic of the magma source of Suiyo Seamount. A simple mixing of 97% MORB mantle with 3% subducting slab explains well the composition of the helium and carbon in the parent magma.

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