| 鄂尔多斯盆地中北部直罗组砂岩地球化学、碎屑锆石U-Pb年龄对物源和构造背景的限定 |
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| 关键词:Ordos Basin Zhiluo Formation geochemistry detrital zircon U-Pb age source rocks LA-ICP-MS |
| 基金项目:中国地质调查局地质调查项目(编号: DD20230045)；内蒙古中西部重点铀矿勘查区块优选调查评价项目(编号: D20221678-5) |
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| Geochemistry of Sandstones and U-Pb Ages of Detrital Zircons in the Zhiluo Formation of the Central and Northern Ordos Basin, China: Constraints on Provenance and Tectonic Setting |
| The Middle Jurassic Zhiluo Formation, as an important uranium-bearing layer in the Ordos Basin, has received only relatively weak source analysis research in the central part of the basin. In this study, petrology, element geochemistry, detrital zircon U-Pb dating, and other methods are used to trace the source of sandstone in the lower member of the Zhiluo Formation in the Dinggedangmiao area in the central part of the basin and compare these results with those of the basin margin. The petrologic and geochemical results show that the sandstone in the research area was derived from the upper crust. The U-Pb dating results show that the ages of the zircons in the sandstone samples from the lower Zhiluo Formation in the Dinggedangmiao study area generally fall into the three age ranges of 300~200 Ma, 2 100~1 500 Ma, and 2 600~2 200 Ma. The Precambrian zircons are mainly from the Daqingshan, Wulashan, and Yinshan areas. The Late Paleozoic to Early Mesozoic zircons are mainly from the Daqingshan area. Based on a comparative study of zircon fragments in the uranium deposits in the northeast of the basin and the Zhiluo Formation in the central region, it is believed that the source geological bodies of the Zhiluo Formation were already exposed to the surface, but not extensively exposed, during the Indosinian sedimentary period. In combination with the regional sedimentologic characteristics, the analysis indicated that the sandstone-type uranium deposits extending from the northeast to the middle of the Ordos Basin have the same source, a north-to-south paleocurrent and provenance direction, and a sedimentary system that gradually changed from a braided river sedimentary system to a braided river delta sedimentary system. |
| YANG Tongxu,YU Reng’an,RONG Hui,LI Tong,ZHU Qiang,SI Qinghong,TU Jiarun,PENG Shenglong.2024.Geochemistry of Sandstones and U-Pb Ages of Detrital Zircons in the Zhiluo Formation of the Central and Northern Ordos Basin, China: Constraints on Provenance and Tectonic Setting[J].Acta Geoscientica Sinica,45(6):941-952. |
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