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    程先钰, 张天福, 苗培森, 程银行, 李建国, 奥琮, 肖荣阁. 鄂尔多斯盆地西南缘洛河组下段含铀砂岩锆石U-Pb年代学：对岩石圈伸展作用的启示[J]. 中国地质, 2023, 50(3): 853-871. DOI: 10.12029/gc20200309001
    引用本文: 程先钰, 张天福, 苗培森, 程银行, 李建国, 奥琮, 肖荣阁. 鄂尔多斯盆地西南缘洛河组下段含铀砂岩锆石U-Pb年代学：对岩石圈伸展作用的启示[J]. 中国地质, 2023, 50(3): 853-871. DOI: 10.12029/gc20200309001
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    CHENG Xianyu, ZHANG Tianfu, MIAO Peisen, CHENG Yinhang, LI Jianguo, AO Cong, XIAO Rongge. Detrital zircon U-Pb geochronology of uranium-bearing sandstone in the lower member of Luohe Formation in the southwest margin of the Ordos Basin: Implications for the lithospheric extension[J]. GEOLOGY IN CHINA, 2023, 50(3): 853-871. DOI: 10.12029/gc20200309001
    Citation: CHENG Xianyu, ZHANG Tianfu, MIAO Peisen, CHENG Yinhang, LI Jianguo, AO Cong, XIAO Rongge. Detrital zircon U-Pb geochronology of uranium-bearing sandstone in the lower member of Luohe Formation in the southwest margin of the Ordos Basin: Implications for the lithospheric extension[J]. GEOLOGY IN CHINA, 2023, 50(3): 853-871. DOI: 10.12029/gc20200309001
    shu

    鄂尔多斯盆地西南缘洛河组下段含铀砂岩锆石U-Pb年代学：对岩石圈伸展作用的启示

    Detrital zircon U-Pb geochronology of uranium-bearing sandstone in the lower member of Luohe Formation in the southwest margin of the Ordos Basin: Implications for the lithospheric extension

      摘要
    • 摘要:
      研究目的 近年来，砂岩型铀矿的研究成为地质学者讨论的热点，对赋铀地层的研究尤为重要。
      研究方法 文章以鄂尔多斯盆地西南缘镇原地区为例，通过对下白垩统洛河组下段含铀砂岩碎屑锆石的LA-ICP-MS U-Pb测年分析，探讨含铀砂岩的物质来源及其构造意义。
      研究结果 结果表明，下白垩统洛河组下段赋铀砂体碎屑锆石U-Pb年龄主要分布在166~370 Ma（n=49）、388~472 Ma（n=14）、1744~2150 Ma（n=14）、2241~2740 Ma（n=14）、615~1623 Ma（n=9）这5个年龄区间，相应的峰值年龄为272 Ma、427 Ma、1899 Ma和2493 Ma，而615~1623 Ma无法确定峰值年龄。
      结论 锆石U-Pb年龄谱对比分析表明，研究区下白垩统洛河组下段含铀砂体总体上具有来自北祁连造山带东段、北秦岭造山带、兴蒙造山带、贺兰山、华北板块基底及阿拉善地块6个物源区，其中北秦岭造山带、北祁连造山带东段为主要物源区。碎屑锆石年龄显示，奥陶纪鄂尔多斯盆地西南缘形成被动陆缘，志留纪—泥盆纪转化为碰撞造山带，石炭纪—二叠纪由造山带转化为沉积盆地，侏罗纪—白垩纪形成稳定沉积地层为铀矿贮存提供有利空间。

       

      Abstract:
      This paper is the result of mineral exploration engineering.
      Objective In recent years, the study of sandstone-type uranium deposits has become a hotspot among geologists, especially the study of uranium-bearing strata.
      Methods Based on LA-ICP-MS U-Pb dating of detrital zircons from the lower part of the Lower Cretaceous Luohe Formation uranium-bearing sandstones in Zhenyuan area, southwestern Ordos Basin, the provenance and tectonic significance of uranium-bearing sandstones are discussed.
      Results The results show that the detrital zircon U-Pb ages of the lower member of the Lower Cretaceous Luohe Formation are mainly distributed in five age intervals: 166-370 Ma (n=49), 388-472 Ma (n=14), 1744-2150 Ma (n=14), 2241-2740 Ma (n=14) and 615-1623 Ma (n=9), besides 615-1623 Ma whose peak age can not be determined, and the corresponding peak ages are 272 Ma, 427 Ma, 1899 Ma and 2493 Ma, respectively.
      Conclusions Comparative analysis of detrital zircon U-Pb age spectra shows that the lower member of Lower Cretaceous Luohe Formation in the study area has six source areas, including the eastern part of the North Qilian orogenic belt, the North Qinling orogenic belt, the Xingmeng orogenic belt, the Helan Mountain, the basement of the North China Plate and the Alxa Block, among which the eastern part of the North Qinling orogenic belt and the North Qilian orogenic belt are the main source areas. The detrital zircon ages show that the southwest margin of Ordos Basin formed a passive continental margin in Ordovician, the Silurian-Devonian transformed into a collisional orogenic belt, the Carboniferous-Permian transformed from an orogenic belt into a sedimentary basin, and the Jurassic-Cretaceous formed stable sedimentary strata to provide favorable space for uranium ore storage.

       

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