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238U-230Th radioactive disequilibrium in the northern Izu arc: (230Th/232Th) in the sub-arc mantle
2008
Geochemical Journal
Major and trace element abundances, Sr and Nd isotopic ratios, and 238 U-230 Th radioactive disequilibria have been analyzed for samples from five volcanoes, Oshima, Miyakejima, Niijima, Teishi Knoll and Fuji, located in the northern Izu arc to investigate across-arc and regional variations of chemical compositions of mantle and fluids expelled from a subducting slab. The abundances and abundance ratios of both fluid mobile and immobile trace elements show across-arc variations. All samples but
doi:10.2343/geochemj.42.461
fatcat:od3dn3hbdzgexisuf3iloeyiti