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<p>Here we performed LA-ICP-MS U-Pb geochronology of individual calcite cements from different regions within a single strike-slip intra-cratonic fault in the Western Shunbei area, Tarim Basin, NW China. U-Pb geochronology of calcites unravel two separate phases (456±12 and 442±14 Ma) of tectonic activities during Middle Caledonian orogeny, which are slightly later than the final closure of ancient Kudi ocean and subduction of Eastern Kunlun terrane, respectively. These disparities could be attributed to compressional stress transmission and associated fault propagation within the sedimentary basin. LA-ICP-MS analysis integrated with theoretical calculation further suggests that the original fluid dominantly inherited the geochemical signatures of host-carbonate rocks, followed by the influxes of hot silica-rich fluid, particularly in the periphery of SHB53X well. U-Pb geochronology thus not only unravels regional tectonism and associated fluid flow in complex sedimentary basin but also provides reliable geochronological information for the evolutionary process of the Proto-Tethys Ocean.</p>

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LA-ICP-MS U-Pb geochronology of calcites reveals multiphase tectonic activities and associated fluid flow in Western Shunbei area, NW China

  • 期刊论文

  • 发表日期：

    2025年3月12日

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  • Shaofeng Dong,
  • Jun Han,
  • Jianxin Zhao,
  • Donghua You

摘要

Here we performed LA-ICP-MS U-Pb geochronology of individual calcite cements from different regions within a single strike-slip intra-cratonic fault in the Western Shunbei area, Tarim Basin, NW China. U-Pb geochronology of calcites unravel two separate phases (456±12 and 442±14 Ma) of tectonic activities during Middle Caledonian orogeny, which are slightly later than the final closure of ancient Kudi ocean and subduction of Eastern Kunlun terrane, respectively. These disparities could be attributed to compressional stress transmission and associated fault propagation within the sedimentary basin. LA-ICP-MS analysis integrated with theoretical calculation further suggests that the original fluid dominantly inherited the geochemical signatures of host-carbonate rocks, followed by the influxes of hot silica-rich fluid, particularly in the periphery of SHB53X well. U-Pb geochronology thus not only unravels regional tectonism and associated fluid flow in complex sedimentary basin but also provides reliable geochronological information for the evolutionary process of the Proto-Tethys Ocean.