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Science 29 October 1999:
Vol. 286. no. 5441, pp. 937 - 939
DOI: 10.1126/science.286.5441.937
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Reports

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

Simon M. Peacock, 1* Kelin Wang 2

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.

1 Department of Geology, Arizona State University, Tempe, AZ 85287-1404, USA.
2 Pacific Geoscience Centre, Geological Survey of Canada, Sidney, BC V8L 4B2, Canada.
*   To whom correspondence should be addressed. E-mail: peacock{at}asu.edu

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