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- 星野 光雄
- Laboratory of Geology, College of General Education, Nagoya University
書誌事項
- タイトル別名
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- Two-pyroxene amphibolites in Dogo, Oki islands, Shimane-ken, Japan.
抄録
The Oki metamorphic massif consists of pelitic gneiss, migmatitic gneiss, augen gneiss, amphibolite and calcareous gneiss, and this massif has a characteristic dome structure. Sillimanite and orthoclase are stable in the pelitic gneiss and this coexistence indicates the higher grade metamorphism.<br> Amphibolites can be divided into two groups:<br>(a) plagioclase-brown hornblende-clinopyroxene-orthopyroxene-quartz-ilmenite-pyrrhotite (-magnetite)<br>(b) plagioclase-brown hornblende-quartz-ilmenite (-clinopyroxene-magnetite).<br> Orthopyroxene bearing amphibolite (Group a) has higher FeO and SiO2 contents, higher FeO/(FeO+MgO) ratio and lower Fe2O3/(Fe2O3+FeO) ratio. Orthopyroxene is considered to be formed by the reaction of hornblende+quartz=orthopyroxene+clinopyroxene+plagioclase+water. In this reaction orthopyroxene can be easily formed under the Fe2+-rich environment.<br> Geological and petrographical evidences indicate that orthopyroxene-bearing amphibolite and orthopyroxene-free amphibolite are formed under same metamorphic condition, which is transitional from the amphibolite facies to the granulite facies.
収録刊行物
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- 岩石鉱物鉱床学会誌
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岩石鉱物鉱床学会誌 74 (3), 87-99, 1979
一般社団法人 日本鉱物科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681193142144
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- NII論文ID
- 130003728411
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- COI
- 1:CAS:528:DyaL3cXptFCh
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- ISSN
- 18830765
- 00214825
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可