From source to sink: Coupling relation between the Dabie Shan Orogen provenance and Mesozoic sediments of the south-margin of Hefei Basin, based on the evidence of detrital zircon ages
Li Shuang-Ying, Wei Xing, Xie Wei, Cheng Cheng, Li Min, Hu Bo, Chai Guang-Lu
School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China
Abstract:The Dabie Orogen formed in Triassic and its peripheral Mesozoic basins form a source to sink system.The Hefei Basin with well-developed Mesozoic in the north and well-exposed outcrops in the south provides ideal sedimentary records for the investigation of the basin-ridge source to sink system. Ten sandstone and one conglomerate samples were collected for zircon U-Pb(LA-ICP-MS)dating analysis which result in 742 effective ages(confidence level larger or equal to 85%)ranging from 113 Ma to 2983 Ma. The detrital zircon ages can be divided into five age groups,including 113-137 Ma and with a peak of 131 Ma,184-273 Ma and with a peak of 226 Ma,274-517.3 Ma and with two peaks of 280 Ma and 474 Ma,532-856.6 Ma and with three peaks of 572 Ma,649 Ma and 772 Ma,1786-2600 Ma and with two peaks of 2035 Ma and 2506 Ma. Moreover,we summarized the zircon U-Pb age data of various geological terrains from the Dabie Orogen and comparised the data with the aforementioned five age groups. Based on the zircon U/Pb ages and their Th/U ratios,the five age groups correctly correspond to the provenance geological terrains that are respectively Early Cretaceous magma rocks,Dabie Shan HP-UHP metamorphic rocks,north Huaiyang lower-grade metamorphic rocks,north Dabie orthogneiss and Luzhengguan group metamorphic rocks. According to the youngest zircon U-Pb ages,the Mesozoic stratigraphic framework of the south margin of the Hefei Basin is newly amended,which supports a time frame for source to sink system research. Mesozoic sedimentation in the south margin of the Hefei Basin can be divided into four evolutive stages (i.e., Later Triassic Rhaetian-Early Jurassic Sinemurian,Middle-Later Jurassic,early and Later stages of Early Cretaceous),and major characters and space-time changes of source rocks in each stage also are determined. Detrital zircon U/Pb ages and Th/U ratios suggest that the UHP process happened in the Dabie Orogen to Triassic,not Caledonian or Neoproterozoic. It was in Late Triassic Rhaetian that UHP rocks exhumated and outcropped in surface,and it was Neoproterozoic that the paleo-inland arc of the Dabie Orogen developed. Results from the present study contribute to rebuild tectonic palaeogeography of the Dabie Orogen and provide a case for study of basin-ridge source to sink system.
Li Shuang-Ying,Wei Xing,Xie Wei et al. From source to sink: Coupling relation between the Dabie Shan Orogen provenance and Mesozoic sediments of the south-margin of Hefei Basin, based on the evidence of detrital zircon ages[J]. JOPC, 2019, 21(1): 82-106.
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