Petrography and geochemistry for mafic and ultramafic rocks from Tonagh Island in the Napier Complex, East Antarctica: A preliminary report

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概要

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• The geology of Tonagh Island is divided into five geological units. The boundaries among the units are thrusts or shear zones. Tonagh Island is dominated by mafic to felsic layered gneisses. Metamorphosed ultramafic rocks are locally exposed. The dolerite dykes cut the host gneiss and the shear zone, and have chilled margins. Lithological features for mafic and metamorphosed ultramafic rocks on Tonagh Island are classified into the following nine types: 1) two pyroxene gneiss; 2) garnet-bearing two pyroxene gneiss; 3) brown hornblende two pyroxene gneiss; 4) biotite-bearing two pyroxene gneiss; 5) fine- grained garnet two pyroxene gneiss; 6) pyroxenite; 7) websteritic peridotite; 8) hornblende-bearing lherzolitic peridotite; and 9) dolerite. The fine-grained garnet two pyroxene gneiss occurs as dyke cutting the foliation and the layering of the host gneiss. The hornblende-bearing lherzolitic peridotites are considered to be intrusive rocks based on geological investigation. The MORE normalized trace element patterns of the dolerite and the fine-grained garnet two pyroxene gneiss are similar to those of the within-plate basalt. Some of the mafic gneisses and the metamorphosed ultramafic rocks have high MgO contents (up to 31 wt%), and are plotted in the komatiitic field on the (Fe_<total>+Ti)-Al-Mg diagram. The brown hornblende two pyroxene gneiss, the websteritic peridotite and the hornblende-bearing lherzolitic peridotite show similar REE patterns such as light REE enrichment. These geochemical features imply that original rock of some mafic gneiss and metamorphosed ultramafic rocks from Tonagh Island were Archaean komatiitic rock.

• 国立極地研究所の論文

著者

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• Hokada Tomokazu

  Department of Polar Science, School of Mathematical and Physical Sciences, The Graduate University f

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• 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

  Department Of Geology And Mineralogy Graduate School Of Science Kyoto 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

• 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

• Tunogae Toshiaki

  Department of Earth Sciences, Shimane 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

• Tsunogae T

  Univ. Tsukuba Ibraki Jpn

• Toyoshima Tsuyoshi

  Graduate School Of Science And Technology Earth Science Niigata University

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