Seismic facies and specific character of the bottom simulating reflector on the western margin of Paramushir Island,Sea of Okhotsk |
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| Authors: | E I Basov T C E van Weering C Gaedike B V Baranov E P Lelikov A I Obzhirov I N Belykh |
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| Institution: | (1) Chair of Lithology and Marine Geology, Department of Geology, Moscow State University, Vorobjevy Gory, 119899 Moscow, Russia;(2) Department of Marine Geology and Geochemistry, (NIOZ), NIOZ, Netherlands Institute for Sea Research, P.O. Box 59, 1790 AB Den Burg, Texel, The Netherlands;(3) GEOMAR, Wischhofstra e 1-3, Gebäude 4, D-24148 Kiel, Germany;(4) P. P. Shirshov Institute of Oceanology, L. P. Zonenshain Laboratory of Paleogeodynamics, Krasikova st. 23, 117851 Moscow, Russia;(5) Pacific Oceanological Institute, Far East Branch of Russian Academy of Sciences, Baltiiskaya 43, 690041 Vladivostok, Russia;(6) Institute of Marine Geology and Geophysics, Far East Branch of Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russia;(7) Present address: GeoforschungsZentrum Potsdam, Telegrafenberg C2, 14473 Potsdam, Germany |
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| Abstract: | Seismic profiles from a venting area on the western margin of Paramushir Island (Sea of Okhotsk) reveal a local complex structure and an interesting, unusual pattern of the bottom simulating reflector (BSR). The BSR is gradual rising towards the venting area. The geothermal gradient and the bottom temperature confirmed the methane hydrate. The temperature appears to be the most important factor controlling the hydrate stability. A locally higher heat flow caused the upward migration of the hydrate stability field and the subsequent degradation of the hydrated sediments, causing gas vent formation and the flux of methane gas into the water column. |
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