Contribution of slab melting and slab dehydration to magmatism in the NE Japan arc for the last 25 Myr: Constraints from geochemistry
作者： Takeshi Hanyu , Yoshiyuki Tatsumi , Shun'ichi Nakai , Qing Chang , Takashi Miyazaki
DOI: 10.1029/2005GC001220
关键词:
摘要: [1] Hf isotope compositions, coupled with Pb-Sr-Nd isotopes and trace element for the Miocene to Quaternary volcanic rocks from NE Japan arc have documented geochemical evolution in magma source compositions association back-arc opening (23–14 Ma). Clear temporal variation Hf ratios is demonstrated, lowest ɛHf (+9) early highest (+14) late Quaternary, whereas there are little changes Sr Nd composition. clearly correlated some elemental ratios. The observed attributed a change metasomatic agents derived subducted slab, which could been caused by cooling of mantle wedge during syn post stages opening. In stage opening, when injection hot asthenospheric induced high-temperature conditions wedge, slab melting contributed low ɛNd, relatively La/Nb, high Th/Yb rocks. On other hand, later volcanism, characterized ɛHf, decoupling variable La/Nb Ba/La, best explained addition fluids sediments oceanic crust wedge.
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