Mineral paragenesis in thermally metamorphosed serpentinites, Ohsa-yama, Okayama Prefecture
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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
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- Okayama University Earth Science Report
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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
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詳細情報 詳細情報について
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- CRID
- 1390009224581089024
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- NII論文ID
- 120002310611
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- NII書誌ID
- AN10506284
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- ISSN
- 13407414
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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
- IRDB
- CiNii Articles