Miocene-pleistocene volcanism of deep-water basins of the Sea of Japan and Sea of Okhotsk |
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| Authors: | T A Emelyanova E P Lelikov |
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| Institution: | (1) Institute of Marine Geology and Chemistry, National Sun Yat-Sen University, Kaohsiung, 804, Taiwan, R.O.C.;(2) Pacific Oceanological Institute Far Eastern Branch, Russian Academy of Sciences, Vladivostok, Russia;(3) OCEAN Laboratory/RIO, SEES, Seoul National University, Shilim-Dong, Gwanak-Gu, Seoul, 151-747, Korea;(4) Frontier Observational Research System for Global Change, International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, AK, 99775-7335, U.S.A |
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| Abstract: | This paper reports the results of petrographic and geochemical studies of the Miocene-Pleistocene volcanic rocks that accompanied
the formation of the deep-water basins of the Sea of Japan and Sea of Okhotsk. The geochemical types of these rocks, their
geodynamic settings, and their derivation from different magmatic sources were determined. The marginal-sea basaltoids of
the Sea of Japan are derivatives of fluid-enriched mantle (EMI), while the volcanics of the Kurile basin were generated from
mantle enriched in continental crust (EMII). In spite of the different conditions of their genesis, they share some common
geochemical features, in particular, their calc-alkaline signatures. These traces of the influence of sialic crust on magma
generation confirm the development of the basins of both these seas on continental basement. |
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