Petrology of peridotite xenolith-bearing basaltic to andesitic lavas from the Shiribeshi Seamount,off northwestern Hokkaido,the Sea of Japan |
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| Institution: | 1. Department of Geosciences, University of Bremen, Klagenfurter Straße (GEO), D-28359 Bremen, Germany;2. Institut für Geologie, Mineralogie und Geophysik, Ruhr Universität Bochum, D-44780 Bochum, Germany;3. Department of Marine Chemistry and Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA;4. Dept. Earth and Environmental Sciences, The University of Michigan, Ann Arbor, MI 48109, USA;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, and School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;2. School of Chemical Engineering, The University of Adelaide, SA 5005, Australia;1. Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu 874-0903, Japan;2. Department of Natural History Sciences, Hokkaido University, Sapporo 060-0808, Japan;3. Department of Earth Sciences, Kanazawa University, Kanazawa 920-1192, Japan;4. Research and Development Center for Ocean Drilling Science, JAMSTEC, Yokosuka 237-0061, Japan;5. Department of Geology, Niigata University, Niigata 950-2182, Japan;6. Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto 606-8501, Japan;7. Graduate School Division of Science and Engineering, University of Toyama, Toyama 930-8555, Japan;8. Graduate School of Engineering, Hokkaido University, Sapporo 060-0808, Japan |
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| Abstract: | The Shiribeshi Seamount off northwestern Hokkaido, the Sea of Japan, is a rear-arc volcano in the Northeast Japan arc. This seamount is composed of calc-alkaline and high-K basaltic to andesitic lavas containing magnesian olivine phenocrysts and mantle peridotite xenoliths. Petrographic and geochemical characteristics of the andesite lavas indicate evidence for the reaction with the mantle peridotite xenoliths and magma mixing between mafic and felsic magmas. Geochemical modelling shows that the felsic end-member was possibly derived from melting of an amphibolitic mafic crust. Chemical compositions of the olivine phenocrysts and their chromian spinel inclusions indicate that the Shiribeshi Seamount basalts in this study was derived from a primary magma in equilibrium with relatively fertile mantle peridotites, which possibly represents the mafic end-member of the magma mixing. Trace-element and REE data indicate that the basalts were produced by low degree of partial melting of garnet-bearing lherzolitic source. Preliminary results from the mantle peridotite xenoliths indicate that they were probably originated from the mantle beneath the Sea of Japan rather than beneath the Northeast Japan arc. |
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| Keywords: | Shiribeshi Seamount Rear-arc volcano Mantle xenolith Magma mixing Magma-peridotite xenolith reaction |
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