Variations in Nd and Sr isotope ratios of Quaternary volcanic rocks from the southwestern Kurile arc: an implication for migration of fluid phases in the subduction zone

Variations in Nd and Sr isotope ratios of Quaternary volcanic rocks from the southwestern Kurile arc: an implication for migration of fluid phases in the subduction zone

Variations in 87Sr/86Sr and 143Nd/144Nd ratios of basalt-andesite lavas from the Quaternary volcanoes of the southwestern Kurile arc show seesaw lateral trends toward the back-arc side. Combining trace element data, the complex lateral variations in the isotopic compositions can be ascribed to addit...

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Veröffentlicht in:Gankō : Ganseki Kōbutsu Kōshō Gakkai shi PETROLOGY AND ECONOMIC GEOLOGY, 1990/01/05, Vol.85(1), pp.1-9
Hauptverfasser: IKEDA, YASUO, KAGAMI, HIROO, KATSUI, YOSHIO, KURASAWA, HAJIME
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container_title Gankō : Ganseki Kōbutsu Kōshō Gakkai shi
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creator IKEDA, YASUO
KAGAMI, HIROO
KATSUI, YOSHIO
KURASAWA, HAJIME
description Variations in 87Sr/86Sr and 143Nd/144Nd ratios of basalt-andesite lavas from the Quaternary volcanoes of the southwestern Kurile arc show seesaw lateral trends toward the back-arc side. Combining trace element data, the complex lateral variations in the isotopic compositions can be ascribed to addition of fluids released from amphibole in the mantle wedge beneath the volcanic front and from phlogopite in the wedge on the back-arc side. The basalts of Rishiri volcano, which is located farthest away from the trench, shift to MORB composition because addition of fluids from the subducted oceanic lithosphere is not expected. It seems that interaction between the subducted oceanic lithosphere and mantle wedge governs the geochemical characteristics of arc magmas.
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title Variations in Nd and Sr isotope ratios of Quaternary volcanic rocks from the southwestern Kurile arc: an implication for migration of fluid phases in the subduction zone
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