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• W2773765544 abstract "This paper presents new geochronological and geochemical data for early Paleozoic intrusive rocks from the Khanka Massif in the Russian Far East, with the aim of elucidating the Paleozoic evolution and tectonic attributes of the Khanka Massif. New U–Pb zircon data indicate that early Paleozoic magmatism within the Khanka Massif can be subdivided into at least four stages: ~ 502, ~ 492, 462–445, and ~ 430 Ma. The ~ 502 Ma pyroxene diorites contain 58.28–59.64 wt% SiO2, 2.84–3.69 wt% MgO, and relatively high Cr and Ni contents. Negative εHf(t) values (− 1.8 to − 0.4), along with other geochemical data, indicate that the primary magma was derived from partial melting of mafic lower crust with the addition of mantle material. The ~ 492 Ma syenogranites have high SiO2 and K2O contents, and show positive Eu anomalies, indicating the primary magma was generated by partial melting of lower crust at relatively low pressure. The ~ 445 Ma Na-rich trondhjemites display high Sr/Y ratios and positive εHf(t) values (+ 1.8 to + 3.9), indicating the primary magma was generated by partial melting of thickened hydrous mafic crust. The ~ 430 Ma granitoids have high SiO2 and K2O contents, zircon εHf(t) values of − 5.4 to + 5.8, and two-stage model ages of 1757–1045 Ma, suggesting the primary magma was produced by partial melting of heterogeneous Proterozoic lower crustal material. The geochemistry of these early Paleozoic intrusive assemblages indicates their formation in an active continental margin setting associated with the subduction of a paleo-oceanic plate beneath the Khanka Massif. The εHf(t) values show an increasingly negative trend with increasing latitude, revealing a lateral heterogeneity of the lower crust beneath the Khanka Massif. Regional comparisons of the magmatic events indicate that the Khanka Massif in the Russian Far East has a tectonic affinity to the Songnen–Zhangguangcai Range Massif rather than the adjacent Jiamusi Massif." @default.
• W2773765544 created "2017-12-22" @default.
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• W2773765544 date "2018-02-01" @default.
• W2773765544 modified "2023-10-18" @default.
• W2773765544 title "Geochronology and geochemistry of early Paleozoic intrusive rocks from the Khanka Massif in the Russian Far East: Petrogenesis and tectonic implications" @default.
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• W2773765544 doi "https://doi.org/10.1016/j.lithos.2017.12.004" @default.
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