Inferred ultrahigh-temperature metamorphism of amphibolitized olivine granulite from the Sor Rondane Mountains, East Antarctica
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概要
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This paper reports the first evidence of ultrahigh-temperature (UHT) metamorphism from the Sor Rondane Mountains, eastern Dronning Maud Land, East Antarctica, which is evident as orthopyroxene + spinel symplectite in an amphibolitized mafic granulite. The granulite consists of olivine, orthopyroxene, clinopyroxene, pargasitic amphibole, plagioclase, and ilmenite, and it possesses a within-plate alkali basalt signature. The local bulk chemical composition of symplectite, major and trace element compositions, and thermodynamic calculations for the symplectite, suggest the presence of garnet at the high-pressure stage and that the symplectite formed from garnet, olivine, and primary orthopyroxene by decompression from more than 12 kbar at 1000 °C. The granulite records a subsequent amphibolite-facies overprint (<700 °C at <6 kbar) that involved the chemical re-equilibration of several phases. The obtained pressure-temperature (P-T) conditions and P-T path are different from the UHT metamorphism from the Schirmacher Hills, central Dronning Maud Land, which is considered to have occurred in a back-arc tectonic setting. The relatively high-P conditions and the decompression path reconstructed in the present study are similar to those reported for southern India, Sri Lanka, and part of northeastern Mozambique, possibly reflecting continental thickening and exhumation during the main collision event between East and West Gondwana.
著者
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Baba Sotaro
Department Of Natural Environment University Of The Ryukyus 1 Senbaru Nishihara Okinawa 903-0213 Jap
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Baba Sotaro
Department Of Crustal Studies National Institute Of Polar Research
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Adachi Tatsuro
Department Of Polar Science School Of Multidisciplinary Sciences The Graduate University For Advance
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Y
Fukuoka Univ. Education Munakata Jpn
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Kyushu University
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Hokada Tomokazu
National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan
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Nakano Nobuhiko
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Tsunogae Toshiaki
Graduate School Of Science And Technology Niigata University
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Hamamoto T
Dia Consultants Co. Ltd. Aichi Jpn
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Hamamoto Takuji
Graduate School Of Science And Technology Niigata University
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Osanai Y
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Adachi Tatsuro
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Osanai Yasuhito
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Toyoshima Tsuyoshi
Graduate School Of Science And Technology Niigata University
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Nakano Nobuhiko
Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University
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Hokada Tomokazu
National Inst. Of Polar Res.
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Tsunogae T
Univ. Tsukuba Ibraki Jpn
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Toyoshima Tsuyoshi
Graduate School Of Science And Technology Earth Science Niigata University
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