Geochemistry of mafic metamorphic rocks in the Lutzow-Holm Complex, East Antarctica: Implications for tectonic evolution
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概要
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Mafic metamorphic rocks are widely distributed through the Lutzow-Holm Complex (LHC) of East Antarctica, as layers between or enclaves within metasedimentary and metaigneous lithologies. It has been inferred that the peak metamorphic grade of the LHC progressively increases in a southwestern direction from amphibolite-facies to granulite-facies conditions, with mineral assemblages in the mafic metamorphic rocks changing from hornblende (magnesiohornblende)±biotite+plagioclase to orthopyroxene+clinopyroxene±hornblende (pargasite, magnesiohasting-site and tschermakite)±biotite±garnet+plagioclase. Field relationships suggest that amphibolite-grade mafic metamorphic rocks derive from mafic magma intruded into metasedimentary units, whereas granulite-facies mafic metamorphic rocks are a mixture of detrital blocks and mafic sill or intrusions. Major and trace element compositions of mafic metamorphic rocks are similar to those of igneous rocks of tholeiite affinity, and can be divided into volcanic-arc basalt (VAB)-type or mid-ocean ridge basalt (MORB)-type compositions. On a regional scale, VAB-type lithologies are predominant in amphibolite-facies areas, and MORB-type lithologies predominate in granulite-facies areas. On the basis of HFSE concentrations and Nb/Y ratios, MORB-type lithologies have T-type and E-type MORB compositions with oceanic plateau basalt and back-arc basin basalt affinities, and are occasionally found in the field intercalated with metasedimentary layers, characteristic of magmatism and sedimentation cycles in a marginal sea basin setting. Such field relationships provide information on the tectonic environment of protolith formation in the LHC. Various crustal components have been amalgamated into a relatively narrow mobile belt, which was subjected to high-grade metamorphism during the final closure of oceanic basins as a result of continent-continent collision.
- 国立極地研究所の論文
著者
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Satish-Kumar M.
静岡大学理学部
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加々島 慎一
山形大学理学部
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Satish-Kumar M.
Institute of Geosciences, Shizuoka University
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Hiroi Yoshikuni
Department of Earth Sciences, Faculty of Science, Chiba University
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Motoyoshi Yoichi
National Institute of Polar Research
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Kagashima Shin-ichi
Department of Earth and Environmental Sciences, Faculty of Science, Yamagata University
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Suda Yoshimitsu
National Institute of Polar Research
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Satish-kumar M.
Institute Of Geoscience Shizuoka University
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サティッシュ・クマール M.
高知大
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Satish-kumar M.
静岡大学理学部地球科学教室
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Hiroi Yoshikuni
Department Of Earth Sciences Chiba University
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Satish‐kumar M.
静岡大
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