Relation between mantle shear zone deformation and metasomatism in spinel peridotite xenoliths of Jeju Island (South Korea): Evidence from olivine CPO and trace elements |
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| Institution: | 1. Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan;2. Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-Nihonmatsu, Sakyo, Kyoto 606-8501, Japan;3. Institute of Nature and Environmental Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan;4. The Hokkaido University Museum, Hokkaido University, N10 W8 Kitaku, Sapporo, Hokkaido, 060-0810, Japan;5. Department of Natural History Science, Hokkaido University, N10 W8 Kitaku, Sapporo, Hokkaido 060-0810, Japan;1. V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the RAS, 3, Ac. Koptyuga Ave., Novosibirsk 630090, Russian Federation;2. Novosibirsk State University, Pirogova St. 2, Novosibirsk 630090, Russian Federation;3. JV Tairus, 3, Ac. Koptyuga Ave., Novosibirsk 630090, Russia;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;1. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. ARC Centre of Excellence for Core to Crust Fluid Systems and GEMOC, Department of Earth and Planetary Sciences, Macquarie University, NSW 2109, Australia |
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| Abstract: | This study presents geochemical and fabric analysis of coarse-grained, porphyroclastic and mylonitic spinel peridotite xenoliths derived from the shallow subcontinental lithospheric mantle of Jeju Island (South Korea). Fabric analysis of olivines in the studied peridotites shows activation of the high temperature (0 1 0)1 0 0] slip system; however, in the porphyroclastic and mylonitic peridotites, activation of (0 k l)1 0 0] slip system results in a weaker fabric. Formation of porphyroclastic and mylonitic fabrics are thought to form in a shear-dominated environment. The results of the trace element analysis reveal that the smaller the grain size and weaker the fabric, the more enriched in LREE and HFSE are the peridotites, which indicates a strong relationship between metasomatic agents and mantle shear zones. |
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