Effects of recycled materials involved in a mantle source beneath the southwest Japan arc region: evidence from noble gas, Sr, and Nd isotopic systematics
作者： Yasuo Ikeda , Keisuke Nagao , Hiroo Kagami
DOI: 10.1016/S0009-2541(00)00354-5
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摘要: Abstract Isotopic compositions of He, Ar, Kr, Xe, Sr, and Nd concentrations noble gases are reported for phenocrysts, megacrysts, ultramafic xenoliths in Cenozoic basalts from southwest (SW) Japan compared with those lavas tectonic emplaced peridotite northeast (NE) arc. The mantle source beneath SW arc indicate that the old subducted oceanic crust sediment (enriched mantle, EM1) is major mantle. Some demonstrates mixing depleted (mid-ocean ridge (MORB) mantle) recycled materials (EM2). isotopic data rocks (Tsuyama lherzolite) contribution a Samoan-like plume component. This suggests some formed by upwelling deep-mantle superplume. processes among materials, may have produced heterogeneity region. On other hand, olivine phenocrysts basalt NE simple binary trends between (MORB components (EM2 component).
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