Hydrogeochemical characteristics of the sandstone-hosted uranium mineralization in northern Ordos Basin, China

Chen, Gongxin; Sun, Zhifu; Fengjun, Nie; Li, Chenglong; Zhen, Yang; Zhou, Zhongkui

doi:10.1016/j.oregeorev.2020.103769

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…During the Eocene-Miocene epoch, interstratigraphic oxidation gradually weakened, resulting in uranium precipitation, deposition, and enrichment (Figure 3). Afterward, the uranium deposits were further enriched and preserved by the secondary reduction in oil and gas [9,[32][33][34][35].…”

Section: Geological Settingmentioning

confidence: 99%

Characters and Metallogenetic Significance of Organic Matter in Coal from the Daying Sandstone-Hosted Uranium Deposit in the Northern Ordos Basin, China

Luo

et al. 2023

Minerals

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Coal is usually found in many sandstone-hosted uranium deposits in western China. However, it remains unclear whether coal organic matter is related to the mineralization of uranium in sandstone. In this study, the organic matter of coal containing lenticular carbon plant strips and carbon clastics was analyzed in different alteration zones in the Daying sandstone-hosted uranium deposit located in the northern Ordos Basin. According to geological and geochemical characters, Daying sandstone can be classified into three alteration zones: the oxidation zone, the transition zone, and the reduction zone. The results are as follows. Firstly, the maceral organic matter of the coal at Daying is mostly vitrinite, indicating the characters of humic coal. The maturity of the organic matter is low, which is in the transitional evolution stage of immature lignite or lignite-long-flame coal. Secondly, the kerogen is mainly type III (humic type), which can be easily transformed into humic acid with a strong adsorption capacity for uranium. Thirdly, the vitrinite reflectance (Ro) of the coal organic matter in the transition zone is higher than that of the other alteration zones. Meanwhile, there are bright white bands in the microscopic components of the organic matter of the coal in the transition zone (mineralized zone) and a certain composition of the sapropelite has strong fluorescence. All three aforementioned phenomena are related to the radioactivity of uranium, and each of them possesses the potential for application in mineral exploration. Fourthly, the extraction and separation of humic substances indicates that humic acid plays a key role in organic matter-related uranium mineralization. In the transition zone, uranium can co-precipitate as a humate, and the transition zone’s organic carbon content increases. Therefore, the organic matter in coal contributes to sandstone-hosted uranium mineralization, providing a further guide to prospecting methodologies.

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Section: Geological Settingmentioning

confidence: 99%

Characters and Metallogenetic Significance of Organic Matter in Coal from the Daying Sandstone-Hosted Uranium Deposit in the Northern Ordos Basin, China

Luo

et al. 2023

Minerals

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“…Moreover, As had a relatively smaller loading in PC1 and did not show a correlation with other metals, and this may also be derived from the dissolution and release of minerals. PC2, which explains 27.3% of the total variance, was mainly characterized by the positive loading of Na + (0.92), Cl -(0.77), and SO 2 4-(0.73), suggesting that these ions migrate in surface water and the groundwater surrounding lakes (Chen et al 2020a, Zhang &Wang 2020.…”

Section: Source Identi Cation and In Uence Factorsmentioning

confidence: 99%

“…The ecological geography of the Ordos Plateau is arid/semi-arid steppe -desert area, with lots of wind and sand and little precipitation. Therefore, saline lakes are an important water resource in this region, maintaining the regional ecosystem security of the Ordos Plateau, which is an important base for the production of raw coal, petroleum, trusone, and other chemicals in China (Chen et al 2020a, Chen et al 2020c, Qi et al 2020. Heavy metal elements released by industrial development pose a serious threat to saline lake.…”

Section: Introductionmentioning

confidence: 99%

Distribution characteristics, source identification, and risk assessment of heavy metals in surface sediments of the salt lakes in the Ordos Plateau, China

Zhang

Chen

et al. 2022

Environ Sci Pollut Res

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Salt lakes have a signi cant effect on the regional climate, environment, and ecology in semi-arid regions characterized by lower rainfall and high evaporation. However, under the stresses of global change and human disturbance, anthropogenic pollution is the main factor threatening the lake ecological environment. Surface sediment samples collected from four salt lakes in the Ordos Plateau were used to investigate the salinity, concentration, pollution status, potential sources of heavy metals, and in uencing factors. The surface sediments of Beida Pond and Gouchi Pond were weakly alkaline (pH < 9) owing to Na 2 SO 4 , whereas those of Chaigannaoer and Hongjiannao were strongly alkaline (pH > 9) owing to Na 2 CO 3 . The concentration range of Cr, Ni, Cu, Zn, As, Cd, and Pb in the sediment samples collected from the salt lake in the Ordos followed the order of Cr > Zn > Ni > Pb > Cu > As > Cd. The Cr values were higher in Chagannaoer and Hongjiannao, but the Ni, Cu, and Zn values were higher in Beida Pond and Gouchi Pond. The geoaccumulation index (I geo ) and enrichment factor (EF) consistently indicated that Cr posed the greatest potential ecological risk and that Ni, Cu, and Zn pollution was more severe in Beida Pond and Gouchi Pond than in Chagannaoer or Hongjiannao. However, Er and RI indicated these heavy metals were a low risk to the environment. Risk assessment code (RAC) revealed that Pb and Cr exhibited no mobility and had low potential bioavailability risk, although Zn, Ni, and As were categorized as medium risk. Cu had the highest mobility and high risk. Principal component analysis for Beida Pond and Gouchi Pond revealed that the source of Ni, Cu, Zn, Cd, and Pb might be associated with water -soluble elements in aqueous migration, and the source of Cr, Pb, and As might be lithospheric minerals carried by dust storms. Ni, Cu, Zn, Cd, Cr, and Pb in Chagannaoer and Hongjiannao may be derived from surface runoff, and chemicals from these sources may eventually accumulate in sediments. Pearson's correlation analysis indicated that pH was the main environmental factor controlling the distribution of heavy metals in Chagannaoer and Hongjiannao.

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Combination of seismic attributes using clustering and neural networks to identify environments with sandstone-type uranium mineralization

Wang

Chengyin

et al. 2023

Acta Geophys.

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Hydrogeochemical characteristics of the sandstone-hosted uranium mineralization in northern Ordos Basin, China

Cited by 12 publications

References 29 publications

Characters and Metallogenetic Significance of Organic Matter in Coal from the Daying Sandstone-Hosted Uranium Deposit in the Northern Ordos Basin, China

Characters and Metallogenetic Significance of Organic Matter in Coal from the Daying Sandstone-Hosted Uranium Deposit in the Northern Ordos Basin, China

Distribution characteristics, source identification, and risk assessment of heavy metals in surface sediments of the salt lakes in the Ordos Plateau, China

Combination of seismic attributes using clustering and neural networks to identify environments with sandstone-type uranium mineralization

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