Relict Clinopyroxenes in the Mikabu Greenstones, Oshika and Kosetokyo Districts, Nagano Prefecture, Central Japan

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説明

Magma types and spilitization process of the metamorphosed greenstones (Mikabu greenstones) in the Oshika and Kosetokyo districts were examined on the basis of the chemical composition of rocks and relict clinopyroxenes. The alkali contents of the rocks are plotted in both alkaline and tholeiite basalt fields. However, most greenstones with high alkali contents have less TiO2 and P2O5 than typical alkali basalts. One of the rocks carries the clinopyroxene with high Si and low Ti contents as in tholeiite basalts. These features may be interpreted as due to spilitization. It is suggested that most of the original rocks of the Mikabu greenstones of these districts, especially of Kosetokyo district, show an oceanic tholeiite affinity, though some an alkali basaltic affinity.

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詳細情報 詳細情報について

  • CRID
    1050001338997489408
  • NII論文ID
    120001151977
  • HANDLE
    2115/36670
  • ISSN
    00183474
  • 本文言語コード
    en
  • 資料種別
    departmental bulletin paper
  • データソース種別
    • IRDB
    • CiNii Articles

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