Methane-rich plumes in the Suruga Trough (Japan) and their carbon isotopic characterization

Details Methane-rich plumes in the Suruga Trough (Japan) and their carbon isotopic characterization Methane-rich plumes in the Suruga Trough (Japan) and their carbon isotopic characterization

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.160...97t&link_type=abstract

Earth and Planetary Science Letters, vol. 160, Issue 1-2, pp.97-105

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5

Methane, Carbon, Isotopes, Suruga Bay, Earthquakes

Scientific paper

The carbon isotopic compositions ( 13 C CH4 ) of the methane-rich buoyant plumes, observed in the oxygenated hemipelagic sea waters of the Suruga Trough, Japan, are discussed in relation to their sources. During a survey made in May 1996, two layers of anomalous methane-rich plumes, both of which centred at the same station about a few tens of kilometres off the coast, were found in the Suruga Trough. The deeper plume (ca. 2100 m depth, with a maximum methane concentration of 13 nmol/kg) had already been detected by a previous survey in 1986 at the same station, whereas the shallower plume (ca. 1000 m depth, with a maximum methane concentration of 10 nmol/kg) was newly discovered. The estimated end-member 13 C CH4 value (- PDB) for the deeper plume suggests a microbial origin of the methane, probably derived from some shallow (surface) layer of sediment. The plume could be supplied from a continuous cold fluid seepage on the sea floor of the Suruga Trough. On the other hand, the shallower plume is characterized by more 13 C-enriched end-member methane ( 13 C CH4 = PDB), presumably produced by the thermogenic degradation of organic matter. Since thermogenic methane should originate from a deeper part (more than 1000 m) of the sedimentary layer, it is unlikely that the thermogenic methane reaches the sea water by normal transport processes. The shallower plume may be a result of some sudden, catastrophic event on the sea floor, such as earthquakes.

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