安徽铜陵包村金矿床地质特征及成因探讨
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引用本文:任云生,刘连登,万相宗.2006.安徽铜陵包村金矿床地质特征及成因探讨[J].地球学报,27(6):583-589.
DOI:10.3975/cagsb.2006.06.09
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作者单位E-mail
任云生 吉林大学地球科学学院 吉林长春130061 renyuns@163.com 
刘连登 吉林大学地球科学学院 吉林长春130061  
万相宗 安徽省铜陵市狮子山包村金矿 安徽铜陵244031  
基金项目:国家自然科学基金项目(编号:40472050),吉林大学青年教师基金项目
中文摘要:包村矿床是铜陵地区近年新探明的一个矽卡岩型独立金矿。金矿体主要呈脉状、透镜状、不规则状,赋存于包村石英闪长岩体与中下三叠统碳酸盐围岩的接触带及附近围岩的裂隙中,具脉型金矿化特征;金矿石中富含多种铋矿物,且与金矿化关系密切。矿床地质特征和流体包裹体研究表明,成矿流体是一种与燕山期钙碱性岩浆侵入活动有关的NaCl_H2O_CO2体系,当其沿近南北向包村断裂进入相对开放的脆性构造裂隙空间,因压力骤降而造成流体不混溶,导致CO2和NaCl_H2O相分离,从而引起热液体系pH、Eh、fo2等物理化学条件发生明显改变,最终促使金在有利的空间内富集成矿。
中文关键词:铋矿物  流体相分离  包村金矿床  狮子山矿田
 
Geological Characteristics and Genesis of the Baocun Gold Deposit in Tongling Area, Anhui Province
Abstract:Located in northeastern Shizishan orefield, the Baocun deposit is one of the proved independent skarn gold deposits in Tongling area. Its major gold ore bodies are situated at the contact zone between the ore-forming magmatic bodies and the Lower Triassic carbonate rocks. Some small ore bodies, with features of lode gold mineralization, are distributed in fissures of the wall rocks of the ore-forming magmatic bodies. Bismuth minerals are closely coexistent with gold mineralization in the deposit. Fluid inclusions of different metallogenic stages and geological features of the deposit suggest that the ore-forming fluids belong to the NaCl-H-2O-CO-2 system associated with the Yanshanian calc-alkaline magmatism. When the ore-forming fluids moved into the open space along the SN-trending fault belt, th-e drastic falling of pressure might have caused the phase separation of fluid, the prominent change of pH, Eh and fo-2 as well as the gold precipitation in favorable space.
keywords:bismuth mineral  phase separation of fluid  Baocun gold deposit  Shizishan orefield
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