日高変成帯西帯,幌尻岩体の角閃石(<特集>造岩鉱物研究の現状と展望-地団研第33回総会鉱物学ミニシンポジウム-)

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概要

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• The compositions of amphiboles of four samples which were collected from the Mt. Poroshiri area of the Western Meta-ophiolite zone of the Hidaka metamorphic belt were studied. The four samples (A, B, C & D) show different degrees of recrystallization, i. e. from olivine gabbro to massive amphibolite. The compositions of metamorphic amphiboles are all calciferous but sometimes range from tremolitic to pargasitic amphibole even in the same thin section. Tremolitic amphibole replaces primary clinopyroxene, whereas pargasitic amphibole occurs along the boundary between clinopyroxene and plagioclase or inside plagioclase. Moreover, amphibole with intermediate composition appears between the tremolitic and pargasitic amphiboles. The range of the amphibole composition narrows with the progress of recrystallization, i. e. from A to D. The variation of the amphibole compositions appears to be controlled by different local bulk compositions and by differences in the diffusional process.

• 地学団体研究会の論文
• 1982-03-25

著者

• 宮下 純夫

  北海道大学.理学部.地質学教室

関連論文

• The structure of Hidaka axial zone interpreted as the result of a right-lateral strike-slip movement. : 構造地質
• 日高変成帯西帯におけるオフィオライト層序の復元
• 日高変成帯西帯,幌尻岩体の角閃石(造岩鉱物研究の現状と展望-地団研第33回総会鉱物学ミニシンポジウム-)

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