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• W2256095938 endingPage "31" @default.
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• W2256095938 abstract "Abstract There is significant debate regarding the mineralization ages of the East Kounrad, Zhanet and Akshatau W-Mo deposits of Central Kazakhstan, and the petrogenesis and tectono-magmatic evolution of the granites associated with these deposits. To address these issues, we present molybdenite Re-Os dating, zircon U-Pb dating, whole rock geochemistry as well as Sr-Nd-Pb and zircon O-Hf isotopic analyses on the pre-mineralization and ore-forming granites. U-Pb dating of zircons from pre-mineralization granitic rocks yield Late Carboniferous ages of 320–309 Ma, whereas ore-forming granites have Early Permian ages of 298–285 Ma. Molybdenite Re-Os isotopic data indicate a mineralization age of ~ 296 Ma at East Kounrad, ~ 294 Ma at Akshatau and ~ 285 Ma at Zhanet. The pre-ore and ore-forming granites are high-K calc-alkaline, metaluminous to slightly peraluminous I-type granites. The pre-mineralization granites are relatively unfractionated, whereas the ore-forming granites are highly fractionated. The fractionating mineral phases are probably K-feldspar, apatite, Ti-bearing phases and minor plagioclase. The pre-mineralization and ore-forming rocks are characterized by similar Sr-Nd-Pb-Hf-O isotopic compositions (( 87 Sr/ 86 Sr) i  = 0.70308–0.70501, e Nd (t) = − 0.5 to + 2.8, 207 Pb/ 204 Pb = 15.60–15.82, zircon e Hf (t) = + 1.2 to + 15.6 and δ 18 O = + 4.6 to + 10.3‰), whole rock T DM C (Nd) (840–1120 Ma) and zircon T DM C (Hf) (320–1240 Ma). The isotopic characteristics are consistent with a hybrid magma source caused by 10–30% assimilation of ancient crust by juvenile lower crust. The geochronology and geochemistry of these granites show that the Late Carboniferous pre-mineralization granitic rocks formed during subduction, whereas the Early Permian ore-forming, highly fractionated granite probably underwent significant fractionation with a restite assemblage of K-feldspar, apatite, Ti-bearing phases and minor plagioclase and developed during collision between the Yili and Kazakhstan terranes commenced at the latest Late Carboniferous." @default.
• W2256095938 created "2016-06-24" @default.
• W2256095938 creator A5003497492 @default.
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• W2256095938 date "2016-05-01" @default.
• W2256095938 modified "2023-10-02" @default.
• W2256095938 title "Geochronology, petrogenesis and tectonic settings of pre- and syn-ore granites from the W-Mo deposits (East Kounrad, Zhanet and Akshatau), Central Kazakhstan" @default.
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• W2256095938 doi "https://doi.org/10.1016/j.lithos.2016.01.023" @default.
• W2256095938 hasPublicationYear "2016" @default.
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