Report

Seismic Consequences of Warm Versus Cool Subduction Metamorphism: Examples from Southwest and Northeast Japan

+ See all authors and affiliations

Science  29 Oct 1999:
Vol. 286, Issue 5441, pp. 937-939
DOI: 10.1126/science.286.5441.937

You are currently viewing the abstract.

View Full Text

Abstract

Warm and cool subduction zones exhibit differences in seismicity, seismic structure, and arc magmatism, which reflect differences in metamorphic reactions occurring in subducting oceanic crust. In southwest Japan, arc volcanism is sparse and intraslab earthquakes extend to 65 kilometers depth; in northeast Japan, arc volcanism is more common and intraslab earthquakes reach 200 kilometers depth. Thermal-petrologic models predict that oceanic crust subducting beneath southwest Japan is 300° to 500°C warmer than beneath northeast Japan, resulting in shallower eclogite transformation and slab dehydration reactions, and possible slab melting.

  • * To whom correspondence should be addressed. E-mail: peacock{at}asu.edu

View Full Text

Related Content