冀北隐伏火山热液型铀矿地表地球化学异常

doi:10.11720/wtyht.2023.2695

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Abstract

The Daguanchang uranium deposit, a typical concealed volcanic hydrothermal uranium deposit, was selected to investigate the relationship between surface geochemical characteristics and deep uranium ore bodies of volcanic hydrothermal uranium deposits in North China. The samples for soil survey were collected in the Daguanchang mining area. They were taken from the soil in the upper part of boreholes revealing deposits and mineralization for the analyses of the instantaneous radon (Rn) concentration, mobile-state uranium, and ²¹⁰Po of soil. Then, this study explored the relationships between these geochemical characteristics and deep uranium ore bodies. The results are as follows. The soil in the upper part of boreholes revealing high-grade deposits (also referred to as high-grade boreholes) had significantly higher instantaneous Rn concentration than that in the upper part of boreholes revealing mineralization (also referred to as mineralization boreholes). The high instantaneous Rn concentration in the soil samples collected from a large area corresponded well to the deep uranium ore bodies. The high-grade boreholes had slightly high ²¹⁰Po. However, the ²¹⁰Po in the surface soil samples showed small dispersion and relatively uniform distribution and did not exhibit differences between the barren and mining areas. Mobile-state uranium in high-grade boreholes did not exhibit significant anomalies. The maximum anomaly value of mobile-state uranium in soil samples collected from a large area occurred in the known barren areas. Therefore, it can be preliminarily concluded that, for the exploration of deeply buried uranium ore bodies on a large scale, the anomalies of instantaneous Rn concentration in the soil can indicate the anomalies of deeply buried uranium ore bodies, while the mobile-state uranium and ²¹⁰Po in soil are less sensitive than instantaneous Rn.

Key words： concealed volcanic hydrothermal uranium deposit mobile-state uranium ²¹⁰Po instantaneous Rn concentration Daguanchang uranium deposit

Received: 23 December 2021 Published: 27 April 2023

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	Articles by authors
	Yang-Yang ZHANG
	Yue-Long CHEN
	Da-Peng LI
	Huan KANG
	Ming-Liang FANG
	Yun-Liang XU

Cite this article:

Yang-Yang ZHANG,Yue-Long CHEN,Da-Peng LI, et al. Surface geochemical anomalies of concealed volcanic hydrothermal uranium deposit in northern Hebei[J]. Geophysical and Geochemical Exploration, 2023, 47(2): 300-308.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.2695 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I2/300

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Geotectonic location(a) and geological sketch (b) of the Daguanchang uranium deposit (modified from reference [17])

Statistics of repeat sample qualification rate

Assay results of surface soil gas Rn, ²¹⁰Po and mobile-state uranium around borehole

Statistical parameters of soil radon gas, ²¹⁰Po and mobile-state uranium analytical results in soil area samples (n=35)

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Histogram(a) and Quantile-Quantile plot(b) of soil gas Rn content (modified from reference [20])

Histogram of ²¹⁰Po (a) and mobile-state uranium content(b) distribution

20], ²¹⁰Po concentration (b) and mobile-state uranium concentration(c)
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Contour map of soil gas Rn (a)^[20], ²¹⁰Po concentration (b) and mobile-state uranium concentration(c)

Line chart of soil gas Rn, ²¹⁰Po concentration and mobile-state uranium concentration in soil profile

Student's T test of soil gas Rn, ²¹⁰Po and mobile-state uranium

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