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- W2774551849 endingPage "462" @default.
- W2774551849 startingPage "449" @default.
- W2774551849 abstract "Abstract The central Nanling region in South China was the site of uplift, extensional deformation, granite magmatism and hydrothermal activity from 180 to 150 Ma. Information on the age, petrological characteristics, major and trace element contents, whole rock Sr and Nd and zircon Hf isotopic compositions of granitic plutons were synthesized to constrain the sources, evolutionary processes, and uplift-cooling rates of intrusions that host Cu–Mo and W–Sn deposits in this region. The older (180–160 Ma) Cu–Mo related granitoids are less differentiated, A1 type alkaline rocks with faster cooling and uplift rates. They have younger Nd and Hf two-stage model ages and higher eNd(t) and eHf(t) values that indicate mantle derived magmas were moderately contaminated by upper crust. The younger (160–150 Ma) W–Sn related granites are more differentiated, A2 type aluminous rocks with slower cooling and uplift rates. They have older Nd and Hf two-stage model ages and lower eNd(t) and eHf(t) values that require more upper crustal contamination. The time–space distribution and characteristics of these granitoids and ore deposits are indicative of centralized mantle upwelling and gradational crustal extension. The older rapidly-uplifted, less contaminated granitoids with Cu–Mo mineralization occur near the center of an intra-continental extension bulge produced by mantle upwelling, whereas the younger, slowly-uplifted, more contaminated granitoids with W–Sn mineralization occur on the periphery. The results suggest that metals in the Cu–Mo deposits may have come from the mantle whereas those in the world-class Nanling W–Sn polymetallic deposits were derived from Early Mesoproterozoic (1.4–1.6 Ga) crustal basement of the Cathaysia Block in South China." @default.
- W2774551849 created "2017-12-22" @default.
- W2774551849 creator A5017519129 @default.
- W2774551849 creator A5052716474 @default.
- W2774551849 creator A5058157129 @default.
- W2774551849 creator A5085501730 @default.
- W2774551849 date "2018-01-01" @default.
- W2774551849 modified "2023-10-12" @default.
- W2774551849 title "Petrogenesis of Jurassic A-type granites associated with Cu-Mo and W-Sn deposits in the central Nanling region, South China: Relation to mantle upwelling and intra-continental extension" @default.
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