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ID 13899
Eprint ID
13899
フルテキストURL
著者
逸見 千代子 Department of Earth Sciences, Faculty of Science, Okayama University
草地 功 Department of Earth Sciences, School of Education, Okayama University
Kagetama Tatsuya Shinagawa Refractories Co., Ltd.
抄録
The clinopyroxenes of the hybrid rocks from the Hirata outcrop, Kushiro, Hiroshima Prefecture, Japan are grouped into(1)diopside, (2)aegirine, and (3)zoned pyroxene. The diopside occurs as isolated crystals enclosed in feldspars. The aegirine occurs along with late hydrous minerals in pore spaces. The zoned pyroxenes occur as discrete cryatals with wide rims growing interstitially between feldspar laths and show a continuous composition-al trend from diopside through hedenbergite and aegirine-augite to aegirine or titanian aegirine. The pyroxenes enclosed in feldspars and the cores of the zoned crystals have nearly same chemical composition. The late stage pyroxenes are characterized by extreme enrichment of sodium and sometimes titanium. The titanian aegirines studied hera are characterized by the predominance of the Na(Fe2+, Mg)0.5Ti0.5Si2O6 component over other Ti-bearing pyroxene components. The compositional trend of clinopyroxenes from the Hirata hybrid rocks follows a typical trend of peralkalne rocks. The peralkaline neture of the Hirata samples is a result of compositional change of magma accompanied by the metasomatic skarn formation.
キーワード
aegirine
aegirine-augite
diopside
pyroxene
hybrid rock
skarn
発行日
2000-09-20
出版物タイトル
Okayama University Earth Science Report
出版物タイトル(別表記)
岡山大学地球科学研究報告
7巻
1号
出版者
岡山大学理学部地球科学教室
出版者(別表記)
Department of Earth Sciences Faculty of Science, Okayama University
開始ページ
27
終了ページ
34
ISSN
1340-7414
NCID
AN10506284
資料タイプ
紀要論文
言語
English
著作権者
岡山大学地球科学研究報告編集委員会
論文のバージョン
publisher
査読
無し
Eprints Journal Name
esr