[an error occurred while processing this directive] Global Geology 2020, 23(3) 135-148 DOI:   10.3969/j.issn.1673-9736.2020.03.01  ISSN: 1673-9736 CN: 22-1371/P
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本文关键词相关文章
Inner Mongolia
Baiyinnuo'er deposit
thermodynamics
本文作者相关文章
MA Wanli
YANG He
WANG Keyong
PubMed
Article by Ma W
Article by Yang H
Article by Wang K
Controlling factors of sphalerite and galena deposition in Baiyinnuo'er skarn deposit, Inner Mongolia, China
MA Wanli1, YANG He1, WANG Keyong1,2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources of China, Changchun 130061, China
摘要： The temperature, pH, fO2 and Cl- activity have been considered to be significant physicochemical parameters which controlled sulphide mineralization. Especially, the change of pH is considered to play one of the key roles in skarn deposit because of the involvement of marble. But few scholars have evaluated the impact of each parameter on mineralization. In this study, the authors have constructed thermodynamic model, calculated the important aqueous species activities in Baiyinnuo'er deposit, and evaluated the influence of these parameters on the solubility of Pb and Zn. The results show that the logfO2 decreased from -33.834 to -39.256, pH decreased from 4.0 to 3.7 and the Cl- activity increased from 0.25 to 0.30 in the main mineralization stage. The effect of fO2 was readily ruled out because the reaction of Pb and Zn precipitation did not involve changes in the valence of the element. The decreased pH was impossible to be a mineralization factor, which was confirmed by metal solubility evaluation. The Cl- activity was also considered to be a negative factor. In fact, the dominant factor of mineralization was temperature, not the combination of various parameters as previously thought. Even in the skarn stage, the main factor to make the metal solubility >10% was also the high temperature. A significant increase in pH only occurred in the post-ore stage in response to the production of large amount of calcite.
关键词： Inner Mongolia   Baiyinnuo'er deposit   thermodynamics  
Controlling factors of sphalerite and galena deposition in Baiyinnuo'er skarn deposit, Inner Mongolia, China
MA Wanli1, YANG He1, WANG Keyong1,2
1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources of China, Changchun 130061, China
Abstract: The temperature, pH, fO2 and Cl- activity have been considered to be significant physicochemical parameters which controlled sulphide mineralization. Especially, the change of pH is considered to play one of the key roles in skarn deposit because of the involvement of marble. But few scholars have evaluated the impact of each parameter on mineralization. In this study, the authors have constructed thermodynamic model, calculated the important aqueous species activities in Baiyinnuo'er deposit, and evaluated the influence of these parameters on the solubility of Pb and Zn. The results show that the logfO2 decreased from -33.834 to -39.256, pH decreased from 4.0 to 3.7 and the Cl- activity increased from 0.25 to 0.30 in the main mineralization stage. The effect of fO2 was readily ruled out because the reaction of Pb and Zn precipitation did not involve changes in the valence of the element. The decreased pH was impossible to be a mineralization factor, which was confirmed by metal solubility evaluation. The Cl- activity was also considered to be a negative factor. In fact, the dominant factor of mineralization was temperature, not the combination of various parameters as previously thought. Even in the skarn stage, the main factor to make the metal solubility >10% was also the high temperature. A significant increase in pH only occurred in the post-ore stage in response to the production of large amount of calcite.
Keywords: Inner Mongolia   Baiyinnuo'er deposit   thermodynamics  
收稿日期 2019-10-31 修回日期 2019-11-25 网络版发布日期  
DOI: 10.3969/j.issn.1673-9736.2020.03.01
基金项目:

Supported by Self-determined Foundation of Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources (No. DBY-ZZ-18-12).

通讯作者: WANG Keyong
作者简介:
作者Email: wangky@jlu.edu.cn
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