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• W4387207725 endingPage "107197" @default.
• W4387207725 startingPage "107197" @default.
• W4387207725 abstract "Studies on the widely-exposed Neoproterozoic geological records in the Bikou terrane (northwestern Yangtze Block, Central China) have produced different tectonic models (e.g., arc, rift and ridge settings), confusing the relationships between the Bikou and Yangtze blocks in the Neoproterozoic. In addition to the Neoproterozoic Bikou Group igneous rocks and Hengdan Group sedimentary strata which have been well investigated, clastic sedimentary records in the westernmost regions are also crucial for understanding the Neoproterozoic tectonic evolution of the terrane. Here, we target a 3000 m-thick siliciclastic outcrop section along the Bailongjiang River and conduct sedimentological, petrographic, elemental geochemical and zircon U-Pb geochronological analyses to constrain depositional time, sediment provenance and tectonic settings. The outcrop indicates an overall coarsening-upward sedimentary succession, from deep-water sequences to ice-water sequences with dropstone textures. Two volcanic tuffaceous rocks from the basal and middle parts of the succession were dated as 773.2 ± 5.9 Ma and 758.0 ± 8.7 Ma, respectively. The upper parts are characterized by thick, continuous, poorly-sorted glacial diamictites and are conformably overlain by Ediacaran strata. We contend that these diamictites are most likely equivalents to the widespread Cryogenian strata in the Yangtze Block. While provenance analysis results demonstrate felsic bedrock-dominated source terranes with minor mafic contributions, the dropstone gravel components, sandstone petrography and heavy mineral compositions and fine-grained sedimentary rock element concentrations are evidently variable vertically, revealing temporal variations in sediment source-to-sink systems in this region during the late Tonian–Cryogenian. We suggest that the late Tonian deposits were most likely fed by proximal mixed sources with continental arc-related and recycled orogenic terranes, whereas the Cryogenian deposits were dominated by detritus from recycled orogenic terranes. Climate change during the Neoproterozoic glacial-interglacial cycles also played a crucial role in the variable deposit compositions by regulating sediment transport agents and abilities. We favor that the Bikou terrane connected with the Yangtze Block under convergent settings during the early-middle Neoproterozoic and was subsequently under extensional settings. Such findings are a significant step in our understanding of the role of the Yangtze Block in global Neoproterozoic tectonic and climatic frameworks." @default.
• W4387207725 created "2023-09-30" @default.
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• W4387207725 date "2023-10-01" @default.
• W4387207725 modified "2023-10-14" @default.
• W4387207725 title "Age, provenance and tectonic setting of the Tonian–Cryogenian clastic successions in the northwest Bikou terrane, NW Yangtze Block, Central China" @default.
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• W4387207725 doi "https://doi.org/10.1016/j.precamres.2023.107197" @default.
• W4387207725 hasPublicationYear "2023" @default.
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