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- W2000273706 abstract "Abstract Abundances of major and trace elements were determined for the Tertiary volcanic rocks from SW Hokkaido. The Late Miocene to Pliocene volcanic rocks of this region show geochemical features similar to those of the Quaternary rocks, that is, K/Si, Th/Si and LREE/HREE ratios increasing across the arc, east to west, from the Pacific to the Japan Sea side. In contrast, the Early Miocene volcanic rocks, which are geographically restricted to the Japan Sea coast, are distinct from all later volcanics and show “within-plate” characteristics — in particular, high concentrations of HFS elements. The Quaternary basalts have low Hf/Yb ratios and Hf contents, whereas the Early Miocene basalts are high in Hf/Yb and Hf, similar to Hawaiian alkali basalts. The compositional variation with time may result from the progressive depletion of incompatible HFS elements in the mantle source. Th/Yb ratios increase from Early Miocene to Quaternary, possibly reflecting increase in the LIL element contribution to the mantle source during that time." @default.
- W2000273706 created "2016-06-24" @default.
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- W2000273706 date "1987-06-01" @default.
- W2000273706 modified "2023-09-25" @default.
- W2000273706 title "Geochemical variation with time in the Cenezoic volcanic rocks of southwest Hokkaido, Japan" @default.
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- W2000273706 doi "https://doi.org/10.1016/0377-0273(87)90042-4" @default.
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