THE SIGNIFICANCE OF EUHEDRAL CALCIC PLAGIOCLASE INCLUSIONS IN GARNET FROM THE LUTZOW-HOLM COMPLEX, EAST ANTARCTICA : A TEXTURAL INDICATOR OF PARTIAL MELTING IN PELITIC GNEISSES
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THE SIGNIFICANCE OF EUHEDRAL CALCIC PLAGIOCLASE INCLUSIONS IN GARNET FROM THE LUTZOW-HOLM COMPLEX, EAST ANTARCTICA : A TEXTURAL INDICATOR OF PARTIAL MELTING IN PELITIC GNEISSES
Department of Earth Sciences, Faculty of Science, Chiba University
National Institute of Polar Research
National Institute of Polar Research
Department of Geology, Australian National University
抄録(英)
Calcic, faceted plagioclase inclusions occur commonly within garnet porphyroblasts in upper amphibolite to granulite facies pelitic rocks of the Early Paleozoic Lutzow-Holm Complex, East Antarctica, as is also the case in high grade pelitic metamorphics worldwide. That euhedral plagioclase crystals are only preserved as inclusions in garnet and not in the matrix of these rocks is due to the rigid nature of garnet protecting inclusions from later deformation and recrystallization. The occurrence may have resulted from a partial melting reaction as follows-Biotite+sillimanite+sodic plagioclase+K-feldspar+quartz±H_2O=granitic melt+garnet+more calcic plagioclase+ilmenite (or rutile). Thus euhedral plagioclase is a potential indicator of partial melting during high temperature metamorphism.
雑誌書誌ID
AA1072335X
雑誌名
Proceedings of the NIPR Symposium on Antarctic Geosciences
THE SIGNIFICANCE OF EUHEDRAL CALCIC PLAGIOCLASE INCLUSIONS IN GARNET FROM THE LUTZOW-HOLM COMPLEX, EAST ANTARCTICA : A TEXTURAL INDICATOR OF PARTIAL MELTING IN PELITIC GNEISSES
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KJ00002368419
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概要
