ID | 13938 |
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Sort Key | 1
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Abstract | 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.
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Keywords | peridotite
serpentinite
thermal metamorphism
contact metamorphism
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Publication Title |
Okayama University Earth Science Report
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Published Date | 1995-09-20
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Volume | volume2
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Issue | issue1
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Publisher | 岡山大学理学部地球科学教室
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Publisher Alternative | Department of Earth Sciences Faculty of Science, Okayama University
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Start Page | 1
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End Page | 12
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ISSN | 1340-7414
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NCID | AN10506284
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Content Type |
Departmental Bulletin Paper
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OAI-PMH Set |
岡山大学
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language |
English
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Copyright Holders | 岡山大学地球科学研究報告編集委員会
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File Version | publisher
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Eprints Journal Name | esr
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