Seismic consequences of warm versus cool subduction metamorphism: Examples from southwest and northeast Japan

Science

Volumn 286, Issue 5441, 1999, Pages 937-939

  Peacock, Simon M ^a   Wang, Kelin ^b  

^a ARIZONA STATE UNIVERSITY   (United States)

^b Geological Survey of Canada Sidney   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

METAMORPHISM; SEISMICITY; SUBDUCTION;

ARTICLE; EARTHQUAKE; GEOGRAPHIC DISTRIBUTION; GEOLOGY; JAPAN; NATURAL SCIENCE; PRIORITY JOURNAL; VOLCANO;

JAPAN;

EID: 0033615609     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.286.5441.937     Document Type: Article

References (29)

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14. -1 for depths >95 km. Where material is advecting through the arc-side boundary, we set the horizontal conductive heat flux to 0. For the trench-side boundary, we used oceanic geotherms [C. A. Stein and S. Stein, Nature 359, 123 (1992)] of 130 Ma for NE Japan and 0 to 15 Ma for SW Japan with the seafloor and lower boundary kept at 0° and 1450°C, respectively. The thickness of the rigid lithosphere of Japan was fixed at 50 km, corresponding to the 850°C isotherm. In the mantle wedge, beneath the rigid lithosphere, flow induced by the subducting slab was approximated using an analytical corner flow solution [ G. K. Batchelor, An Introduction to Fluid Dynamics (Cambridge Univ. Press, Cambridge, 1967)]. As depicted in Fig. 2, no flow was permitted in the tip of the mantle wedge in order to satisfy the surface heat flux data in NE Japan and to be consistent with dynamical subduction models [ C. Kincaid and I. S. Sacks, J. Geophys. Res. 102, 12295 (1997)]. Our model does not include magma generation and transport and therefore does not generate high temperatures beneath active volcanoes.
15. -1 for depths >95 km. Where material is advecting through the arc-side boundary, we set the horizontal conductive heat flux to 0. For the trench-side boundary, we used oceanic geotherms [C. A. Stein and S. Stein, Nature 359, 123 (1992)] of 130 Ma for NE Japan and 0 to 15 Ma for SW Japan with the seafloor and lower boundary kept at 0° and 1450°C, respectively. The thickness of the rigid lithosphere of Japan was fixed at 50 km, corresponding to the 850°C isotherm. In the mantle wedge, beneath the rigid lithosphere, flow induced by the subducting slab was approximated using an analytical corner flow solution [ G. K. Batchelor, An Introduction to Fluid Dynamics (Cambridge Univ. Press, Cambridge, 1967)]. As depicted in Fig. 2, no flow was permitted in the tip of the mantle wedge in order to satisfy the surface heat flux data in NE Japan and to be consistent with dynamical subduction models [ C. Kincaid and I. S. Sacks, J. Geophys. Res. 102, 12295 (1997)]. Our model does not include magma generation and transport and therefore does not generate high temperatures beneath active volcanoes.
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29. Supported by NSF grants EAR 97-25406 and 98-09602 to S.M.P. Geological Survey of Canada contribution number 1999150.