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East Sakhalin island arc paleosystem of the Sea of Okhotsk region

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Abstract

It has been established that volcanic rocks of the Schmidt, Rymnik, and Terpeniya terranes are fragments of the compound Early to Late Cretaceous-Paleogene East Sakhalin island arc system of the Sea of Okhotsk region. This island arc paleosystem was composed of back-arc volcano-plutonic belt, frontal volcanic island arc, fore-arc, inter-arc, and back-arc basins, and the Sakhalin marginal paleobasin. The continental volcanic rocks dominate in the back-arc volcano-plutonic belt and frontal volcanic island arc. The petrochemical composition of basalts, basaltic andesites, andesites, and trachytes from the frontal island arc formed in submarine conditions are typical of oceanic island arc or marginal sea rocks (IAB). The petrochemical composition of volcanic rocks from the island arc structures indicates its formation on the heterogeneous basement including the continental and oceanic blocks.

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Original Russian Text © V.M. Grannik, 2012, published in Doklady Akademii Nauk, 2012, Vol. 445, No. 4, pp. 433–436.

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Grannik, V.M. East Sakhalin island arc paleosystem of the Sea of Okhotsk region. Dokl. Earth Sc. 445, 934–938 (2012). https://doi.org/10.1134/S1028334X12080041

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