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安徽铜陵狮子山矿田铜、金共生与分离的热力学研究
投稿时间:2011-03-28  修订日期:2011-04-05  点此下载全文
引用本文:徐晓春,楼金伟,谢巧勤,肖秋香,梁建锋,褚平利.2011.安徽铜陵狮子山矿田铜、金共生与分离的热力学研究[J].地质学报,85(5):731-743.
Xu Xiaochun,Lou Jinwei,Xie Qiaoqin,Xiao Qiuxiang,Liang Jianfeng,Chu Pingli.2011.Thermodynamic study for the association and fractionation of copper and gold in the Shizishan orefield, Tongling, Anhui Province[J].Acta Geologica Sinica,85(5):731-743.
DOI:
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作者单位E-mail
徐晓春 合肥工业大学资源与环境工程学院 xuxiaoch@sina.com 
楼金伟 合肥工业大学资源与环境工程学院
安徽省公益性地质调查管理中心 
 
谢巧勤 合肥工业大学资源与环境工程学院  
肖秋香 合肥工业大学资源与环境工程学院  
梁建锋 合肥工业大学资源与环境工程学院  
褚平利 合肥工业大学资源与环境工程学院  
基金项目:国家自然科学基金项目(40972063)和国土资源部公益性行业科研专项(201011050-03),国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:狮子山矿田是安徽铜陵矿集区内最具代表性的大型铜金多金属矿田。矿田内铜、金矿床或矿体既各自独立产出,又相互共生或伴生,铜矿化和金矿化在时间上和空间上存在既共生又分离的现象。本文选择矿田内代表性铜矿床和金矿床开展系统的流体包裹体地球化学研究,并进行成矿流体中铜、金溶解度的热力学理论计算和分析,探索铜、金共生与分离的机制和制约因素。研究认为,狮子山矿田成矿热液流体中的铜主要以CuCl2-和CuCl0络合物形式迁移,铜的溶解度受热液中的Cl-浓度影响,铜的卸载沉淀主要受温度、pH值、fO2和fS2等因素控制;金主要以Au(HS)2-和Au2S(HS)22-络合物形式迁移,金的溶解度受热液中的总硫浓度影响,金的卸载沉淀同样受温度、pH值、fO2和fS2等因素控制。共存于同一成矿流体中的铜和金由于其络合物类型和溶解度的差异及其对物理化学条件变化作出的响应不同,铜在较高温度及偏酸性条件下即开始沉淀,而金则在较低温度和弱碱性条件下开始沉淀,因而导致铜和金的时空分离,进而分别形成铜矿床和金矿床。
中文关键词:共生与分离  迁移形式  热力学理论  狮子山铜金矿田  安徽铜陵
 
Thermodynamic study for the association and fractionation of copper and gold in the Shizishan orefield, Tongling, Anhui Province
Author NameAffiliationE-mail
Xu Xiaochun Hefei University of Technology xuxiaoch@sina.com 
Lou Jinwei School of Resources and Environmental Engineering, Heifei University of Technology
Management Center of Public Geological Investigation of Anhui Province 
 
Xie Qiaoqin School of Resources and Environmental Engineering, Heifei University of Technology  
Xiao Qiuxiang School of Resources and Environmental Engineering, Heifei University of Technology  
Liang Jianfeng School of Resources and Environmental Engineering, Heifei University of Technology  
Chu Pingli School of Resources and Environmental Engineering, Heifei University of Technology  
Abstract:Shizishan orefield is the most representative large-size copper-gold orefield in Tongling ore district, Anhui Province. Copper mineralization and gold mineralization existed in association or fractionation either temporally or spatially. Based on systematic study of the fluid inclusion for the copper deposits and the gold deposits, the solubility of Cu, Au transportation complexes species has been calculated according to obtained thermodynamic parameters, the mechanism and the key factors to the association and fractionation between copper and gold in ore-forming fluid has been discussed. It is concluded that, in the ore-forming fluid of the Shizishan orefield, the dominant Cu complexes species were CuCl2- and CuCl0 which were affected by the concentration of Cl- anion, the dominant Au complexes species were Au(HS)¬2- and Au2S(HS)22- affected by the total sulfur concentration. The unloading and precipitation of both Cu and Au in the ore-forming fluid was controlled by temperature, pH, fO2 and fS2. The great difference of complexes species and solubility between copper and gold dissolved in the ore-forming fluid responded distinctly to physicochemical conditions, which led to their precipitation difference in time and space, and the temporal-spatial separating of copper mineralization and gold mineralization.
keywords:association and fractionation  migration form  thermodynamic theory  Shizishan copper-gold orefield  Tongling, Anhui Province
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