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- W1924842810 endingPage "3031" @default.
- W1924842810 startingPage "3009" @default.
- W1924842810 abstract "[1] The Quaternary Southwest Japan Arc is a product of subduction of the hot, young Philippine Sea Plate beneath the Eurasian Continental Plate. The magmas erupted from the Southwest Japan Arc belong to a category of magmas commonly referred to as “adakites” or “adakitic magmas”. These magmas show trace element evidence for interaction with garnet at depth, and may be associated with partial melting of subducted altered oceanic crust. Also found throughout the southern Sea of Japan region are alkali basalts with little apparent connection to the subduction zone. We have determined major element, trace element, and Sr, Nd, Pb, and U-Th isotopic compositions for a bimodal suite of lavas erupted at the Daisen volcanic field in the Southwest Japan Arc. These magmas consist of mildly alkaline basalts and a calcalkaline intermediate suite, separated by a ∼10 wt.% silica gap. The intermediate magmas show trace element and isotopic evidence for interaction with garnet, consistent with partial melting of the hot, young (∼20 Ma) Philippine Sea Plate. The Daisen intermediate magmas are distinct from other adakitic magmas in their radiogenic isotopic characteristics, consistent with a significant contribution (∼25%) from subducted Nankai Trough sediments. Our data suggest that the basalts erupted at the Daisen volcanic field are not parental to the intermediate magmas, and contain a small contribution of EM1-like mantle common in Sea of Japan alkali basalts but not apparent in the Daisen intermediate magmas." @default.
- W1924842810 created "2016-06-24" @default.
- W1924842810 creator A5029351425 @default.
- W1924842810 creator A5029814244 @default.
- W1924842810 creator A5037572789 @default.
- W1924842810 creator A5043300492 @default.
- W1924842810 creator A5080779480 @default.
- W1924842810 date "2013-08-01" @default.
- W1924842810 modified "2023-09-25" @default.
- W1924842810 title "Sediment-enriched adakitic magmas from the Daisen volcanic field, Southwest Japan" @default.
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