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Report No.

Relationship between $$^{3}$$He/$$^{4}$$He ratios and subduction of the Philippine Sea plate beneath southwest Japan

Umeda, Koji; Kusano, Tomohiro; Asamori, Koichi; McCrank, G. F.*

In order to elucidate the geographic distribution of $$^{3}$$He/$$^{4}$$He ratios in Southwest Japan, the data from a total of 924 sites were compiled and synthesized. There appears to be good correlation between variations in mantle helium and the geophysical evidence indicating the configuration of the subducting Philippine Sea plate. The helium isotopes observed on the Earth's surface may be efficient geochemical indicators of the configuration of a relatively younger, warm aseismic slab, especially useful in seismically inactive areas.



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Category:Geochemistry & Geophysics



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