Mineral paragenesis in thermally metamorphosed serpentinites, Ohsa-yama, Okayama Prefecture

• Nozaka Toshio

• Shibata Tsugio

抄録

The Ohsa-yama ultramafic body, which consists of several types of serpentinized peridotites, underwent contact metamorphism caused by a Cretaceous granite intrusion ; this metamorphism resulted in the formation of contact aureole, 1.5-2.0 km wide, around the granite intrusion, and produced progressive mineral changes in metaserpentinites toward the contact between the Ohsa-yama body and the granite intrusion. On the basis of analysis of mineral paragenetic relations, the Ohsa-yama ultramafic body can be divided into three zones with progressive changes in mineral assemblages as follows : Zone Ⅰ : serpentine ± chlorite ± brucite Zone Ⅱ : olivine + talc ± tremolite ± chlorite Zone Ⅲ : olivine + orthopyroxene ± tremolite ± spinel Zone Ⅰ corresponds to the parts unaffected by the thermal event, and Zones Ⅱ and Ⅲ correspond to the thermally metamorphosed parts of the Ohsa-yama body. The results obtained in this study are generally consistent with those of the previous studies on metamorphic peridotites from the Sangun and Muzuru zones.

収録刊行物

• Okayama University Earth Science Report

  Okayama University Earth Science Report 2 (1), 1-12, 1995-09-20

  岡山大学理学部地球科学教室

キーワード

• peridotite
• serpentinite
• thermal metamorphism
• contact metamorphism

詳細情報

• CRID: 1390009224581089024
• NII論文ID: 120002310611
• NII書誌ID: AN10506284
• ISSN: 13407414
• DOI: 10.18926/esr/13938
• Web Site: https://ousar.lib.okayama-u.ac.jp/13938
• 本文言語コード: en
• データソース種別:
  • JaLC
  • IRDB
  • CiNii Articles