Biotites from the Takakumayama Granite, Kagoshima Prefecture and their Hydrothermal Experiments at Higher Oxygen Fugacities

Yamamoto, Masahiko

北海道大学理学部紀要, 1978, 18(1-2), 105-115

Permalink : https://hdl.handle.net/2115/34826

このアイテムのアクセス数:1,554件（2026-08-11 08:20 集計）

ファイル	フォーマット	サイズ	閲覧回数	説明
18_1-2_p105-115	pdf	2.21 MB	1,312

アクセス権	open access
URI	https://hdl.handle.net/2115/34826
タイトル	Biotites from the Takakumayama Granite, Kagoshima Prefecture and their Hydrothermal Experiments at Higher Oxygen Fugacities
著者	著者名 Yamamoto, Masahiko
言語	英語
発行日	1978-02
出版者	北海道大学
出版者	Hokkaido University
収録物名	北海道大学理学部紀要
収録物名	Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy
巻(号)	18(1-2)
ページ	105-115
抄録	Compositional variation of biotites from the Takakumayama granite, located in the central part of the Ōsumi Peninsula, Kagoshima Prefecture, was observed. The biotites show compositionally a substitution of 3Mg → 2(Al^VI+Fe^+3)+ Vacancy during the formation of the granite. Hydrothermal experiments on two analyzed biotites were carried out with the HM buffer at temperatures up to 750℃ and 1 kb. An alkali feldspar phase was not formed by partial decomposition, but one or two of iron oxides. Comparison of physical and chemical properties between natural and experimentally treated biotites was examined. By the partial decomposition, Al^+3 is hardly depleted from biotite, and Fe^+3 and octahedral vacancies in biotite increase. The results indicate that the substitution will take place in an oxidizing condition during crystallization of a granitic magma.
資源タイプ	紀要論文
出版タイプ	Version of Record
PISSN	0018-3474