Fluorine-rich calcic amphiboles in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica: Preliminary report

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概要

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• Fluorine-rich calcic amphiboles occur in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica The amphiboles are subdivided into two types high-grade brownish to pale brownish amphibole and retrograde greenish amphibole The brownish amphibole is pargasitic occurring as a subhedral grain in two-pyroxene mafic granulite It contains up to 2 2 wt% fluorine, which corresponds to an F/(F + Cl + OH) ratio of 0 54 (sample B98020801) In sample B98020802B, brownish amphibole is rimmed by an orthopyroxene-plagioclase-quartz corona, probably formed by a devolatilization reaction It has a lower fluorine content of 0 21-0 52 wt% (F/(F +Cl + OH) = 004-0 13) Pale brownish amphibole is a minor phase in metapyroxenite It has the highest fluorine content (2 6 wt%, F/(F + C1 + OH) = 0 60, sample B98012802F) Greenish amphibole is present as fine-grained aggregates with quartz, rimming ortho- and clinopyroxenes Fluorine is almost absent in this amphibole Holloway and Ford (1975) experimentally determined that pargasite with a F/(F +Cl + OH) ratio of 0 48 is stable up to 1100℃ at 5 kbar, and that F/(F + C1 + OH) increases with increasing temperature The fluorine-rich calcic amphiboles in mafic granulites are therefore stable under UHT metamorphic conditions The formation of an orthopyroxene-plagioclase-quartz corona in sample B98020802B can therefore be explained by breakdown of the amphibole due to its low-fluorine content The origin of the fluorine is not known, but it is probably derived from basic magma at the stage of protolith formation

• 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

• Osanai Yasuhito

  Department of earth sciences, Okayama university

• 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

  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

  Facul. Education Shimane Univ.

• 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

• Toyoshima Tsuyoshi

  Graduate School Of 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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