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Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy >
Vol.XX, No.1 >

Fe-Ti Oxide Minerals in the Horoman Plutonic Complex of the Hidaka Metamorphic Belt, Hokkaido

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タイトル: Fe-Ti Oxide Minerals in the Horoman Plutonic Complex of the Hidaka Metamorphic Belt, Hokkaido
著者: Motoyoshi, Yoichi 著作を一覧する
発行日: 1981年 3月
出版者: 北海道大学 = Hokkaido University
誌名: 北海道大学理学部紀要 = Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻: 20
号: 1
開始ページ: 87
終了ページ: 94
抄録: Fe-Ti oxide minerals in the Horoman plutonic complex of the Hidaka metamorphic belt are mostly of ilmenite (α-phase: ilmenite-hematite solid solution) and the occurrence of β-phase (magnetite-ulvöspinel solid solution) has not been reported so far. The ilmenite from Horoman are chemically analyzed in order to estimate the crystallization condition of the dioritic host rocks. Although the Mn/Fe2+ ratio of the host rocks remains constant during the differentiation, the Mn/Fe2+ ratio and R2O3 content of the ilmenite increase successively as the differentiation proceeds. This change in composition must be largely attributed to a decrease of temperature and an increase of oxygen activity in the magma from which the ilmenite crystallized. This observation implies that the Horoman diorite was formed under the 'oxidizing' condition, which means that the decreasing rate of fo2 was lower than that of the standard buffer curve and the crystallization might have proceeded along the course intersecting QFM buffer curve. With these points as background, the crystallization condition of the plutonic rocks in the Hidaka metamorphic belt is briefly discussed with respect to fo2, refering to the isotopic data presented by Sasaki and Ishihara (1979) and Shibata and Ishihara (1979).
資料タイプ: bulletin (article)
URI: http://hdl.handle.net/2115/36709
出現コレクション:Vol.XX, No.1

 

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