鄂尔多斯盆地西南部下白垩统洛河组灰色砂岩的两种成因及其含铀性

朱强; 司庆红; 李建国; 苗培森; 文思博; 李光耀; 张博

doi:10.3799/dqkx.2022.012

Volume 48 Issue 11

Nov. 2023

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Article Navigation > Earth Science > 2023 > 48(11): 3995-4016

Zhu Qiang, Si Qinghong, Li Jianguo, Miao Peisen, Wen Sibo, Li Guangyao, Zhang Bo, 2023. Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin. Earth Science, 48(11): 3995-4016. doi: 10.3799/dqkx.2022.012

Citation:

Zhu Qiang, Si Qinghong, Li Jianguo, Miao Peisen, Wen Sibo, Li Guangyao, Zhang Bo, 2023. Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin. Earth Science, 48(11): 3995-4016. doi: 10.3799/dqkx.2022.012

Citation:

Zhu Qiang, Si Qinghong, Li Jianguo, Miao Peisen, Wen Sibo, Li Guangyao, Zhang Bo, 2023. Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin. Earth Science, 48(11): 3995-4016. doi: 10.3799/dqkx.2022.012

PDF( 16392 KB)

Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin

doi: 10.3799/dqkx.2022.012

Zhu Qiang^{1, 2, 3
,
,},
Si Qinghong^{1, 2, 3
,
,},
Li Jianguo^{4, 2},
Miao Peisen^{1, 2, 3},
Wen Sibo^{1, 2, 3},
Li Guangyao^{1, 2, 3},
Zhang Bo^{1, 2, 3}

1.
Tianjin Center, China Geological Survey, Tianjin 300170, China
2.
Key Laboratory of Uranium Geology, China Geological Survey, Tianjin 300170, China
3.
North China Geological Science and Technology Innovation Center, Tianjin 300170, China
4.
Cores and Samples Center of Natural Resources, China Geological Survey, Yanjiao 065201, China

Received Date: 2021-06-23
Available Online: 2023-11-30
Publish Date: 2023-11-25

Abstract

Abstract

In order to find out the genesis of the gray sandstones of the Lower Cretaceous Luohe Formation in the southwestern Ordos basin, deepen the understanding of the law for uranium mineral enrichment, and locate the occurrence area of sandstone type uranium ore body, the gray sandstone of Luohe Formation is studied by means of rock and mineral identification, XRD analysis and element geochemical analysis. The results show that there are two different genetic types of gray sandstone in the study area. (1) The sandstone in the lower part of Luohe Formation has typical aeolian sedimentary characteristics, with good separation and roundness of clastic particles, high quartz content, low total clay minerals content, the inter-particle porosity is large, indicating that it has a better fluid migration channel, and it has undergone a higher degree of transformation by the later reducing fluid. Meanwhile, this type of sandstone is also the most important uranium rich sand body. (2) The sedimentary types of the upper part of Luohe Formation are mainly braided river channel, channel edge and flooding basin. with medium-poor separation and roundness of clastic particles, low quartz content, high total clay mineral content, the inter-particle porosity is slightly low, and the reduction transformation degree of sandstone is weak or even basically not transformed. The geochemical characteristics of the two genetic gray sandstones are generally consistent, and some elements are different. When the content of U is higher, the contents of Cao, P₂O₅ and MnO in the major elements increase obviously, while the ratio of Fe₂O₃/FeO decreases obviously.The δEu has both positive and negative anomalies and δCe shows mainly negative anomaly in the gray sandstone of aeolian deposition, while both δEu and δCe show negative anomalies in the gray sandstone of fluvial sedimentation. It is concluded that the fluvial sedimentary sandstone of the Luohe Formation is dominated by a reduction environment, which is primary sedimentary sandstone, while aeolian sedimentary sandstone may have undergone the transformation from oxidation to reduction environment, which is altered sandstone. Uranium ore bodies are mostly produced in gray sandstones of eolian deposits. The increase in U content is accompanied by the relative enrichment of P, Ca and ΣREE, the generation of aeolian sedimentary gray sandstone and the enrichment of uranium ore are closely related to the alteration of hydrocarbon fluids.
- gray sandstone,
- genetic type,
- uranium-bearing property,
- Luohe Formation,
- Pengyang uranium deposit,
- Ordos basin,
- mineral deposits

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References(77)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Two Geneses of Gray Sandstone and Their Uranium⁃Bearing Analysis of Lower Cretaceous Luohe Formation in Southwestern Ordos Basin

doi: 10.3799/dqkx.2022.012

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