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Speciation and precipitation of uranium complexes in hydrothermal solutions related to granite-type uranium deposits

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Abstract

Uranium bearing hydrothermal solutions during the stage of ore deposition are weakly alkaline and of the Ca2+ - Na+ /HCO −3 - F− type. UO2(CO3) 2−2 and UO2F −4 , are dominant in the hydrothermal solutions with respect to their activity. Wall-rock hydrothermal alterations, temperature and pressure drop and the reducing capability of rock assemblage (ΔEh) led to a decrease in Eh of the hydrothermal solutions and an increase in Eh at which uranium began precipitating. Therefore, the mechanism of uranium precipitation is essentially the reduction of uranium complexes.

The granite-type uranium deposits are the most important type of uranium resources in China. Discussions will be made in this paper concerning the hydrothermal speciation and precipitation mechanisms of uranium complexes in the light of fluid inclusion and geological data from some major deposits of this type in South China.

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Authors and Affiliations

  1. Nanjing University, 210008, Nanjing

    Chen Peirong, Zhang Bangtong & Zhang Zuhuan

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  1. Chen Peirong
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  2. Zhang Bangtong
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  3. Zhang Zuhuan
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Peirong, C., Bangtong, Z. & Zuhuan, Z. Speciation and precipitation of uranium complexes in hydrothermal solutions related to granite-type uranium deposits. Chin. J. of Geochem. 11, 252–260 (1992). https://doi.org/10.1007/BF02842270

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  • DOI: https://doi.org/10.1007/BF02842270

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