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Composition, Age, and Origin of Cretaceous Granitic Magmatism on the Eastern Chukchi Peninsula

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Abstract

New geochronological and isotopic geochemical data are given, which make it possible to recognize two types of granitic rocks on the eastern Chukchi Peninsula. Early Cretaceous Tkachen and Dolina granitic plutons with zircon ages (U–Pb SIMS) of 119–122 and 131–136 Ma are related to the first type. They cut through Devonian–Lower Carboniferous basement rocks and are overlain by the Aptian–Albian Etelkuyum Formation. Basal units of the latter contain fragments of granitic rocks. Late Cretaceous Provideniya and Rumilet granitic plutons, which contain zircons with ages of 94 and 85 Ma (U–Pb SIMS), respectively, belong to the second type. They cut through volcanic–sedimentary rocks of the Etelkuyum and Leurvaam formations pertaining to the Okhotsk–Chukotka Volcanic Belt. In petrographic and geochemical features, the Early Cretaceous granitic rocks of the Tkachen Pluton are commensurable with I-type granites, while Late Cretaceous granite of the Rumilet Pluton is comparable to A2-type granite. The Sr–Nd isotopic data provide evidence that from the Early Cretaceous Tkachen and Dolina plutons to the Late Cretaceous Provideniya and Rumilet plutons, the degree of crustal assimilation of suprasubduction mantle-derived melts increases up to partial melting of heterogeneous continental crust enriched in rubidium. An unconformity and various degrees of secondary alteration of volcanic–sedimentary rocks have been established in the Okhotsk–Chukotka Volcanic Belt, and this was apparently caused by transition of the tectonic setting from suprasubduction to a transform margin with local extension.

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Correspondence to M. V. Luchitskaya.

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Original Russian Text © M.V. Luchitskaya, S.D. Sokolov, V. Pease, E. Miller, B.V. Belyatsky, 2018, published in Geotektonika, 2018, No. 3, pp. 21–41.

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Luchitskaya, M.V., Sokolov, S.D., Pease, V. et al. Composition, Age, and Origin of Cretaceous Granitic Magmatism on the Eastern Chukchi Peninsula. Geotecton. 52, 312–330 (2018). https://doi.org/10.1134/S0016852118030056

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