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In order to evaluate the effect of the Japan Sea opening upon the mantle wedge beneath the SW Japan arc, rare earth elements (REE) compositions were determined for primitive high magnesian andesites (HMAs) and a basalt from the Setouchi volcanic belt in the SW Japan arc. The older HMA from the Osaka area (13.9 Ma) has higher light rare earth elements (LREE) and lower heavy rare earth elements (HREE) concentrations than the younger HMA from the Shodo-Shima area (12.7 Ma). To explain these REE patterns, mixing calculations were conducted. The results show that 30 ~ 70 % of the asthenospheric component (MORB source like materials) and 70 ~ 30 % of the pre-existing mantle, which is estimated from the Osaka HMA, can account for the REE patterns of the Shodo-Shima HMA and basalt. This result may suggest a replacement of a pre-existing mantle wedge by an asthenospheric component, which is related to the Japan Sea opening.

chishitsu chousa kenkyu houkoku/chishitsu chousa kenkyuu houkoku

Rare earth elements compositions of Setouchi high Mg andesites (HMAs) and basalt; an implication for a mantle compositional shift beneath the SW Japan arc during the Japan Sea opening.