安庆夕卡岩型铁铜矿床流体包裹体研究  

Fluid inclusions of Anqing skarn-type Fe-Cu deposit,Anhui Province

作　　者：杨光树[1] 温汉捷[1] 胡瑞忠[1] 秦朝建[1] 于文修[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室

出　　处：《地球化学》2008年第1期27-36,共10页Geochimica

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-102)

摘　　要：对安庆夕卡岩型铁铜矿床中各成矿阶段的夕卡岩矿物、石英和方解石中流体包裹体的岩相学、显微测温及显微激光拉曼光谱分析等的研究结果表明,成矿流体可能为源自深部的岩浆热液,具高温、高盐度和富CH4等还原性挥发分的特征。流体包裹体的均一温度和盐度在夕卡岩期表现为高温(400～570℃)和高盐度(40%～46%NaCl)特征,代表了夕卡岩形成及铁矿化时的流体活动情况;在石英硫化物期表现出中低温(124～396℃),盐度变化较大(6%～38% NaCl)的特征,代表了铜矿化时的流体活动情况。从成矿早期到晚期,流体包裹体的均一温度和盐度都不断降低,且在铜的主成矿阶段曾发生过流体沸腾作用和混合作用。岩浆水在流体成矿过程中占主导地位。Fluid inclusion study of Anqing skam-type Fe-Cu deposit shows that the ore-forming fluid belongs to NaCl-KCl-H2O solution system, and the primary ore-forming fluid is methane-rich magmatic hydrothermal fluid characterized by high temperature and high salinity. The fluid inclusions of the skarn-stage have high homogeneous temperatures （400 - 570 ℃ ） and high salinities （40% -46% NaCl）, indicating the fluid activities during skam formation and Fe mineralization process. The fluid inclusions of the quartz-sulfide stage have moderate- low homogeneous temperatures （124 - 396 ℃ ）, and large variation of salinities （6% - 38% NaCl）, indicating the fluid activities of Cu mineralization process. The homogeneous temperature and salinity of the fluid inclusions dropped from early to late ore-forming stages, and the boiling and mixing of fluids occurred in the main mineralizing stage of Cu. The magmatic water is dominant in the ore-forming process.

关 键 词：夕卡岩 铁铜矿床 流体包裹体 成矿机制 安庆 安徽省 

分 类 号：P59[天文地球—地球化学] P61[天文地球—地质学]