Metamorphic reactions and preliminary P-T estimates of ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica

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概要

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• Metamorphic reactions and P-T conditions of mafic granulites from Tonagh Island in the Archean Napier Complex were examined to evaluate the nature of mafic granulite which has suffered ultrahigh-temperature (UHT) metamorphism. Although a peak mineral assemblage is preserved in plagioclase-orthopyroxene-clinopyroxene mafic granulites, initial mineral chemistry was completely reset by retrograde metamorphism. Evidence of UHT metamorphism was therefore inferred using lamella-bearing pyroxenes as 900 to 980℃. Hornblende-quartz, biotite-quartz, and garnet-hornblende-quartz coronas around ortho- and clinopyroxenes in two-pyroxene mafic granulites are typical evidence of retrograde metamorphism in amphibolite-facies conditions. The textures suggest that the retrograde event took place in the presence of H_2O-bearing fluid. Garnet-quartz corona after pyroxenes is an another predominant texture of retrograde metamorphism throughout the studied area. As the corona is characterized by anhydrous mineral assemblages, we suggest that retrograde infiltration of H_2O-bearing fluid is a local event. The corona texture suggests that retrograde metamorphism has taken place almost isobarically, because a univariant line of the corona-forming reaction shows a gentle slope in P-T space. The isobaric cooling temperature (650-700℃ at 6.5-8.0 kbar) is, however, significantly lower than the previously reported cooling temperature of approximately 950℃ subsequent to UHT metamorphism. Mafic granulites therefore preserve the second isobaric cooling event, which is distinguished from high-temperature isobaric cooling. The mafic granulites were subsequently intruded by mafic dykes which were also metamorphosed. P-T conditions recorded in the rocks are 630-670℃ at 6.4-8.2 kbar, consistent with the retrograde event of host mafic granulites. The event marks the last stage of regional metamorphism recorded in mafic granulites.

• 国立極地研究所の論文

著者

• Hokada Tomokazu

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

• OWADA Masaaki

  Department of Earth Sciences, Yamaguchi University

• Osanai Yasuhito

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

  Faculty of Education, Okayama University

• Owada Masaaki

  Faculty of Science, Yamaguchi University

• Tunogae Toshiaki

  Faculty of Education, Shimane University

• Toyoshima Tsuyoshi

  Faculty of Science, Niigata University

• Tsunogae T

  Univ. Tsukuba Ibraki Jpn

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