Subduction-stage pressure-temperature path of eclogite from the Sambagawa belt: Prophetic record for oceanic-ridge subduction
説明
Petrologic studies of the Kotsu eclogite from the Sambagawa high-pressure ( P ), low-temperature ( T ) metamorphic belt show that the eclogite has recorded a very steep subduction-stage P-T path reaching 20 kbar and 600 °C; the dP / dT is >7.1 kbar/100 °C. Compilation of previously derived subduction-stage P-T paths from the Sambagawa belt and the result of this study show that these P-T paths are not on a straight line from the origin, but define a curve with dP / dT increasing with pressure. A new model incorporating the progressive approach of an oceanic ridge to a subduction zone shows that the Sambagawa P-T paths are best explained by a setting in which a ridge is close to being subducted at a slow rate relative to the plate-subduction rate. Exhumation of high- P , low- T metamorphic rocks in oceanic subduction zones may be associated with the slow approach and subsequent subduction of oceanic ridges.
収録刊行物
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- Geology
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Geology 31 (12), 1045-, 2003
Geological Society of America
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詳細情報 詳細情報について
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- CRID
- 1361981468517091328
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- NII論文ID
- 30021157476
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- DOI
- 10.1130/g19927.1
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- ISSN
- 00917613
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- データソース種別
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- Crossref
- CiNii Articles
- OpenAIRE