| Speciation and Precipitation of Uranium Complexes in Hydrothermal Solutions Related to Granite—type Uranium Deposits |
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| 引用本文： | 陈培荣,章邦桐,等.Speciation and Precipitation of Uranium Complexes in Hydrothermal Solutions Related to Granite—type Uranium Deposits[J].中国地球化学学报,1992,11(3):252-260. |
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| 作者姓名： | 陈培荣 章邦桐 |
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| 作者单位： | NanjingUniversity,Nanjing210008 |
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| 摘 要： | Uranium-bearing hydrothermal solutions during the stage of ore deposition are weakly alkaline and of the Ca^2 -Na^ /HCO3^- -F^- type.UO2(CO3)2^2- and UO2F4^-, 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 mech-anisms of uranium complexes in the light of fluid inclusion and geological data from some major de-posits of this type in South China.
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| 关 键 词： | 花岗岩型铀矿床 流体包裹体 成矿热液 地质构造 成矿作用 |
Speciation and precipitation of uranium complexes in hydrothermal solutions related to granite-type uranium deposits |
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| Chen Peirong,Zhang Bangtong,Zhang Zuhuan.Speciation and precipitation of uranium complexes in hydrothermal solutions related to granite-type uranium deposits[J].Chinese Journal of Geochemistry,1992,11(3):252-260. |
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| Authors: | Chen Peirong Zhang Bangtong Zhang Zuhuan |
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| Institution: | (1) Nanjing University, 210008 Nanjing |
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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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| Keywords: | |
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