AMMONIUM CONTENT OF BIOTITES FROM GRANITIC AND METAMORPHIC ROCKS IN THE S∅R RONDANE MOUNTAINS, EAST ANTARCTICA
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概要
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Ammonium content of biotites from granitic and metamorphic rocks in the S∅r Rondane Mountains in East Antarctica has been determined in order to examine the difference in the NH_4^+ content of biotites among six granite types. Ammonium content of biotites ranges from 12 to 23ppm (average, 18ppm) in the migmatitic granite, 23 to 80ppm in the foliated granite (average, 46ppm), 22 to 86ppm (average, 66ppm) in the massive granite with migmatitic margin, 11 to 66ppm (average, 42ppm) in the discordant granite, 28 to 106ppm (average, 67ppm) in the granite sheet and dyke, 76 to 109ppm (average, 92ppm) in the small granodiorite bodies, and 25 to 142 ppm (average, 52ppm) in the metamorphic rocks. High NH_4^+ content found in biotites from the small granodiorite bodies is probably due to a result of the interaction between the granitic magma and surrounding metamorphic rocks. Biotites from the migmatitic granite have lowest NH_4^+ content in granitic rocks analyzed. The fact is in discord with the field evidence. The very low NH_4^+ content in biotite from the Nils Larsen tonalite is in good accordance with the view postulated from petrochemical data that granitic magma of this tonalite was directly derived from the melting of subducted oceanic crust or the overlying mantle. In metamorphic rocks, the low NH_4^+ content in biotites is probably due to liberation of NH_4^+ from the rocks during high grade metamorphism (granulite facies).
- 国立極地研究所の論文
著者
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Osanai Yasuhito
Department of earth sciences, Okayama university
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social Andcultural Studies Kyushu University
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Osanai Yasuhito
Department Of Earth And Planetary System Science Okayama University
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Kyushu University
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Osanai Yasuhito
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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Osanai Y
Division Of Evolution Of Earth Environments Faculty Of Social And Cultural Studies Kyushu University
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TAINOSHO Yoshiaki
Department of Natural Environment, Faculty of Human Development, Kobe University
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TAKAHASHI Yuhei
Geological Survey of Japan, Hokkaido Branch
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Takahashi Yuhei
Geological Survey Of Japan
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Takahashi Yuhei
Geological Survey Of Japan Hokkaido Branch
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TAINOSHO YOSHIAKI
Faculty of Human Development, Kobe University
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TSUCHIYA Noriyoshi
Department of Resources Engineering, Faculty of Engineering, Tohoku University
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Tsuchiya N
Tohoku Univ. Sendai
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Tsuchiya Noriyoshi
Department Of Geoscience And Technology Graduate School Of Engineering Tohoku University
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Tainosho Y
Faculty Of Human Development Kobe University
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Tainosho Yoshiaki
Department Of Natural Environment Faculty Of Human Development Kobe University
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