High-grade metamorphic rocks from Skallevikshalsen in the Lutzow-Holm Complex, East Antarctica: metamorphic conditions and possibility of partial melting
スポンサーリンク
概要
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The high-grade metamorphic rocks of Skallevikshalsen, Lutzow-Holm Complex, East Antarctica predominantly comprise garnet-sillimanite gneiss, garnet-spinel-sillimanite gneiss, garnet-biotite gneiss and garnet-two pyroxene-mafic granulite. The metamorphic conditions were estimated using various geothermometers and geobarometers for garnet-biotite gneiss and mafic gneiss. The results were 770-940℃and 0.65-1.2 GPa for garnet-biotite gneiss and 780-960℃ and 0.6-1.1 GPa for mafic gneiss. Garnet-biotite gneiss is widespread in this area and displays a well-developed migmatitic structure. Garnet porphyroblasts in the leucosome and the boundaries between leucosome and melanosome in garnet-biotite gneiss commonly have a poikiloblastic texture with euhedral feldspar and quartz inclusions. High Y concentrations in garnet cores, high An values for plagioclase inclusions, and high Ba contents in K-feldspar from garnet-biotite gneiss are inferred to reflect growth in the presence of partial melt. Garnet in garnet-sillimanite gneiss also has high Y and P contents and chemical zoning that implies changes in trace element distribution coefficients. It is suggested that hydrous melt in garnet-sillimanite gneiss was generated during prograde metamorphism while anhydrous restite underwent continuous high-temperature metamorphism. Garnet-sillimanite gneiss is likely to be the restitic product of partial melting and shows evidence for melt segregation and movement.
- 国立極地研究所の論文
著者
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本吉 洋一
極地研
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本吉 洋一
国立極地研究所
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吉村 康隆
高知大
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Grew Edward
Department Of Geological Sciences University Of Maine
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Grew E.
Department Of Geological Science University Of Maine
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Carson C.
Northern Territory Geological Survey
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DUNKLEY D.
National Institute of Polar Research
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Dunkley Daniel
National Institute of Polar Research, NIPR
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Grew Edwqrd
メーン大学
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Grew E.
メーン大
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Grew Edward
Department Of Geological Science University Of Maine
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Dunkley D
National Institute Of Polar Research
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Motoyoshi Yoichi
National Institute of Polar Research
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Yoshimura Yasutaka
Department of Natural Environmental Science, Kochi University
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Miyamoto Tomoharu
Department of Earth and Planetary Sciences, Kyushu University
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Carson Christopher
Geologcal Survey of Canada
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Miyamoto Tomoharu
Department Of Earth And Planetary Sciences Faculty Of Science Kyushu University
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Dunkley Daniel
National Inst. Of Polar Res.
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Yoshimura Yasutaka
Department Of Natural Environmental Science Faculty Of Science Kochi University
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