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Subduction-stage pressure-temperature path of eclogite from the Sambagawa belt: prophetic record for oceanic-ridge subduction
- Source :
- Geology. Dec, 2003, Vol. 31 Issue 12, p1045, 4 p.
- Publication Year :
- 2003
-
Abstract
- 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 [degrees]C; the dP/dT is >7.1 kbar/100 [degrees]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. Keywords: pressure-temperature path, subduction, oceanic ridge, modeling, eclogite.
- Subjects :
- Geology -- Research
Earth sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00917613
- Volume :
- 31
- Issue :
- 12
- Database :
- Gale General OneFile
- Journal :
- Geology
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.111934868