2003年12月
Subduction-stage pressure-temperature path of eclogite from the Sambagawa belt: Prophetic record for oceanic-ridge subduction
GEOLOGY
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- 巻
- 31
- 号
- 12
- 開始ページ
- 1045
- 終了ページ
- 1048
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1130/G19927.1
- 出版者・発行元
- GEOLOGICAL SOC AMERICA, INC
Petrologic studies of the Kotsu eclogite from the Sambagawa high-pressure (P), low-temperature (7) metamorphic belt show that the eclogite has recorded a very steep subduction-stage P-T path reaching 20 kbar and 600 degreesC; the dP/dT is >7.1 kbar/100 degreesC. 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.
- リンク情報
- ID情報
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- DOI : 10.1130/G19927.1
- ISSN : 0091-7613
- Web of Science ID : WOS:000187031100006