Ultrahigh temperature sapphirine-osumilite and sapphirine-quartz granulites from Bunt Island in the Napier Complex, East Antarctica -Reconnaissance estimation of P-T evolution -

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概要

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• The summer party of the 39th Japanese Antarctic Research Expedition (1997-1998) carried out geological field work on Bunt Island at the southeastern end of Amundsen Bay, Enderby Land, which is in the highest-grade metamorphic region in the Napier Complex. The island is underlain by various kinds of ultrahigh-temperature (UHT) metamorphic rocks including osumilite-bearing aluminous sapphirine-garnet-orthopyroxene granulite and quartz-predominant sapphirine-garnet-sillimanite gneiss containing the assemblage sapphirine-quartz. Osumilite-bearing aluminous granulite is silica-undersaturated, aluminous and magnesian chromium-rich chemical affinity. Osumilite-bearing granulite from Bunt Island could be formed through the mixing of clayey materials or other felsic components derived from felsic igneous rocks with a relatively high proportion of mafic to ultramafic detritus in the sedimentary precursor. The chemical mixing could have taken place during c. 3.2 and c. 2.5 Ga. P-T estimation for osumilite-bearing granulite and related sapphirine-quartz gneiss indicates ultrahigh-temperature condition (〜1100℃, 〜1100 Mpa) as well as other high-grade rocks from the Napier Complex, but the rocks from Bunt Island clearly show isothermal decompression in part of the clockwise P-T evolutional process.

• 国立極地研究所の論文

著者

• Hokada Tomokazu

  National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan

• KUSACHI Isao

  Department of Earth Sciences, Faculty of Education, Okayama University

• Kusachi I

  Okayama Univ. Okayama Jpn

• Kusachi Isao

  Dep. Of Earth Sciences Fac. Of Education Okayama Univ.

• Kusachi Isao

  Department Of Earth Sciences Okayama University

• Kusachi Isao

  Department Of Earth Science Faculty Of Education Okayama University

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• Kusachi Isao

  Department Of Earth Sciences Faculty Of Education Okayama Univresity

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• TSUNOGAE Toshiaki

  Institute of Geoscience, University of Tsukuba

• TOYOSHIMA Tsuyoshi

  Department of Earth Sciences, Niigata University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University

• Osanai Y

  Fukuoka Univ. Education Munakata Jpn

• Osanai Yasuhito

  Department Of Earth And Planetary System Science Okayama University

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Kyushu University

• Hokada Tomokazu

  National Institute Of Polar Research 10-3 Midori-cho Tachikawa Tokyo 190-8518 Japan

• Crowe Warwick

  Department of Geology and Geophysics, University of Western Australia

• Crowe Warwick

  Department Of Geology And Geophysics University Of Western Australia

• Osanai Yasuhito

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

• Tsunogae Toshiaki

  Graduate School Of Science And Technology Niigata University

• Tsunogae Toshiaki

  Institute Of Geoscience The University Of Tsukuba

• Owada Masaaki

  Division Of Earth Sciences Graduate School Of Science And Technology Yamaguchi University

• Owada Masaaki

  Department Of Earth Sciences University Of Yamaguchi

• Hamamoto T

  Dia Consultants Co. Ltd. Aichi Jpn

• Hamamoto Takuji

  Graduate School Of Science And Technology Niigata University

• Osanai Y

  Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University

• Crowe Warwicka.

  Department Of Geology And Geophysics University Of Western Australia

• Osanai Y

  Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University

• Owada Masaaki

  Department Of Mineral Science And Geology Faculty Of Science Yamaguchi University

• Osanai Yasuhito

  Division Of Earth Sciences Faculty Of Social And Cultural Studies Kyushu University

• Hokada Tomokazu

  National Inst. Of Polar Res.

• Tsunogae T

  Univ. Tsukuba Ibraki Jpn

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