Sm-Nd garnet ages of retrograde garnet bearing granulites from Tonagh Island in the Napier Complex, East Antarctica: A preliminary study

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概要

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• Proterozoic Sm-Nd garnet ages were dated from a garnet-bearing quartzo-feldspathic gneiss (Grt-felsic gneiss) and an iron rich garnet-pyroxene gneiss (Fe-rich Grt-Py gneiss) in the northern part of Tonagh Island, the Napier Complex. The Grtfelsic gneiss occurs as a member of layered gneiss. The Fe-rich Grt-Py gneiss appears as a block in the felsic gneiss. Since the layered gneiss contains a critical mineral assemblage of ultrahigh-temperature (UHT) metamorphism such as sapphirine+quartz, the Grt-felsic and the Fe-rich Grt-Py gneisses have undergone UHT metamorphism whose age is believed to be Late Archaean. The inclination line connecting with garnet and whole rock in the Grt-felsic gneiss yields an age of 1897 Ma in the Sm-Nd system. The internal isochron using garnet, pyroxenes and whole rock for the Fe-rich Grt-Py gneiss gives an age of 1557±35 Ma. Both Sm-Nd internal isochron ages correspond to Early Proterozoic. Garnet-quartz symplectite and quartz occur between orthopyroxene and plagioclase in the Grt-felsic gneiss. This texture indicates the following reaction: orthopyroxene+plagioclase=garnet+quartz. The garnet in the Fe-rich Grt-Py gneiss occurs as interstitial mineral with small grained clinopyroxene and quartz. Taking reaction textures into account, the garnet forming reactions in the Grt-felsic and the Fe-rich Grt-Py gneisses would occur during retrograde events after UHT peak metamorphism. The ages of c. 1900 and c. 1550 Ma would therefore reflect tectonothermal events in the Napier Complex.

• 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

• Kagami H

  Graduate School Of Science And Technology Niigata University

• Hamamoto Takuji

  Graduate school of science and technology

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• Kagami Hiroo

  Graduate School of Science and Technology, Niigata University

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• TSUNOGAE Toshiaki

  Institute of Geoscience, University of Tsukuba

• TOYOSHIMA Tsuyoshi

  Graduate school of Science and Technology, 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

• 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

• 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

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Niigata University

• Kagami Hiroo

  Graduate School Of Natural Science And Technology Niigata University

• Hokada Tomokazu

  National Inst. Of Polar Res.

• Tsunogae T

  Univ. Tsukuba Ibraki Jpn

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Earth Science Niigata University

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