Subduction-stage pressure-temperature path of eclogite from the Sambagawa belt: Prophetic record for oceanic-ridge subduction

DOI 33 Citations

Description

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.

Journal

  • Geology

    Geology 31 (12), 1045-, 2003

    Geological Society of America

Citations (33)*help

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Details 詳細情報について

  • CRID
    1361981468517091328
  • NII Article ID
    30021157476
  • DOI
    10.1130/g19927.1
  • ISSN
    00917613
  • Data Source
    • Crossref
    • CiNii Articles
    • OpenAIRE

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