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• W2502141666 abstract "The Jiangnan Fold Belt in the South China Block has been traditionally assumed to be Mesoproterozoic in age and related to the global Grenville orogeny. Sedimentary successions in the Jiangnan Fold Belt archive direct record of tectonic evolution; however, they have not yet been evaluated properly. The Lushan massif, comprising Kangwanggu and Xingzi groups, is the major basement complex in the Jiangnan Belt. Regional correlation of these two groups is poorly constrained, such as with the Shuangqiaoshan group, and thus their role in the regional tectonic evolution is not clear. Detrital zircon U–Pb ages suggest that the Xingzi and Kangwanggu groups were deposited at 820–810 and ca. 830 Ma, respectively. They are composed of dominantly felsic to intermediate volcanic detritus, as indicated by the relatively high Th/Cr (0.24–0.06) ratios and radiogenic Nd isotopes (εNd(t) values = + 1.5 to − 2.9) of the sedimentary rocks. An overwhelming abundance of Neoproterozoic (ca. 860–810 Ma) angular, detrital zircon grains in both the groups indicates derivation chiefly from locally distributed syn-sedimentary igneous rocks. A predominance of zircons with ages close to the time of deposition implies a convergent plate margin setting for Kangwanggu and Xingzi groups. Geochemical signatures, such as La-Th-Co and Th-Sc-Zr/10 plots for Xingzi and Kangwanggu sedimentary rocks also underline tectonically active settings, consistent with the arc affinity of the associated mafic and felsic volcanic rocks. In contrast to the dominant Neoproterozoic detritus in the Kangwanggu sandstone, argillaceous rocks of the Xingzi group received additional input of pre-Neoproterozoic detritus. Moreover, the Xingzi argillaceous rocks have εNd(t) values (+ 0.9 to − 2.9) slightly lower than those of the Kangwanggu sandstones (+ 1.5 to 0.0), indicating contribution from mature crustal materials exposed during progressive uplift of continental basement during orogenesis. These features suggest the Kangwanggu and Xingzi groups' record in a convergent continental margin environment during the formation of the Jiangnan Fold Belt. Persistence of the back-arc basin until ca. 811 Ma suggests that the South China Block occupied a peripheral position in the configuration of the Rodinia supercontinent." @default.
• W2502141666 created "2016-08-23" @default.
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• W2502141666 date "2016-08-01" @default.
• W2502141666 modified "2023-10-15" @default.
• W2502141666 title "Neoproterozoic active continental margin in the southeastern Yangtze Block of South China: Evidence from the ca. 830–810Ma sedimentary strata" @default.
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• W2502141666 doi "https://doi.org/10.1016/j.sedgeo.2016.07.006" @default.
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