Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30nsde6n&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 14, pp. SDE 6-1, CiteID 1760, DOI 10.1029/2003GL017185
Physics
13
Seismology: Lithosphere And Upper Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Earth'S Interior-Composition And State (1212), Tectonophysics: Tomography
Scientific paper
We estimated thermal structure in the mantle wedge of NE Japan by applying the experimental results of olivine-dominated rocks to seismic attenuation data. Obtained temperatures at a 40 km depth are 1000-1130°C and 960-1090°C beneath the volcanic front and the back-arc side, respectively. We cannot obtain the areas with a temperature higher than 1400°C in the mantle wedge, which have been inferred from petrological studies. This is perhaps due to the localization of such anomalous areas. The obtained temperature is higher than that of the wet solidus of peridotite in the greater part of the back-arc side, which suggests that the addition of aqueous fluids plays an important role in generating melts in the mantle wedge.
Hasegawa Akira
Nakajima Jun'ichi
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