島根県隠岐島後の両輝石角閃岩

  • 星野 光雄
    Laboratory of Geology, College of General Education, Nagoya University

書誌事項

タイトル別名
  • 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.

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詳細情報 詳細情報について

  • CRID
    1390282681193142144
  • NII論文ID
    130003728411
  • DOI
    10.2465/ganko1941.74.87
  • COI
    1:CAS:528:DyaL3cXptFCh
  • ISSN
    18830765
    00214825
  • 本文言語コード
    en
  • データソース種別
    • JaLC
    • Crossref
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

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