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• W2605210167 abstract "The Grenvillian-aged mafic magmatism is critical for understanding the regional tectonic settings and testing different tectonic models of South China. However, the geochronology, petrogenesis and geodynamic setting of Grenvillian-aged mafic rocks in the Jiangnan orogen remain unclear. An integrated study on LA−ICP−MS zircon U−Pb geochronology, elemental and zircon Hf isotopic geochemistry has been conducted on the Liujia and Tieshajie basalts in the eastern Jiangnan orogen. Two samples yielded zircon U-Pb ages of ca. 1012–980 Ma. The Liujia and Tieshajie basalts show typical OIB-like trace element patterns, and have high Ti concentrations and positive ɛHf(t) values, implying a fertile asthenospheric mantle as their magma source. The Liujia and Tieshajie basalts have relative low Mg# values (36–58) indicating that their parental magma experienced moderately to strong fractional crystallization of olivine and clinopyroxene. Most samples of the basalts have high Nb/La (1.05–1.39) and Nb/Th (19.04–19.53) values, indicating an insignificant crustal contamination. The 1.01–0.98 Ga intra-plate mafic magmatism argued against the existence of Grenvillian orogeny in the Jiangnan orogen. The geochemical signatures of mafic rocks along the Jiangnan orogen display systematic changes from 1.01–0.98 Ga OIB-like mafic rocks to 0.97–0.83 Ga island arc and arc-like basalts to 0.80–0.76 Ga OIB- and arc-like mafic rocks. The systematic geochemical variations of mafic rocks demonstrate that tectonic switch occurred from an intra-plate regime to an oceanic subduction-related setting to a post-orogenic environment. With respect to Cu-Au mineralization, this study suggests that the Tieshajie deposit is one of the oldest regional mineralization events and the formation of coeval metal-rich juvenile crust is a critical step for the generation of later regional large-scale Cu-Au mineralization." @default.
• W2605210167 created "2017-04-14" @default.
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• W2605210167 date "2018-05-01" @default.
• W2605210167 modified "2023-09-30" @default.
• W2605210167 title "1.01–0.98 Ga mafic intra-plate magmatism and related Cu-Au mineralization in the eastern Jiangnan orogen: Evidence from Liujia and Tieshajie basalts" @default.
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• W2605210167 doi "https://doi.org/10.1016/j.precamres.2017.04.018" @default.
• W2605210167 hasPublicationYear "2018" @default.
• W2605210167 type Work @default.
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