西秦岭凤太矿集区柴蚂金矿床成因的流体包裹体和稳定同位素证据  

Genesis of the Chaima Gold Deposit in the Fengtai Ore Concentration Area,Western Qinling:Constrained by Fluid Inclusion and Stable Isotope Results

作　　者：刘协鲁 王义天[2] 刘敏[2] 胡乔青[2] 魏然[2] 陈绍聪 张娟[2] 王瑞廷 李建华 温深文 陈明寿 彭洛宏 

机构地区：[1]北京探矿工程研究所,北京100083 [2]中国地质科学院矿产资源研究所,国土资源部成矿作用和资源评价重点实验室,北京100037 [3]西北有色地质勘查局,西安710054 [4]西北有色地质勘查局717总队,陕西宝鸡721004

出　　处：《地质学报》2015年第5期873-888,共16页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41372089);中国地质调查局地质调查工作项目(编号1212011220869);中央级公益性科研院所基本科研业务费专项资金项目(编号K0801)联合资助成果

摘　　要：柴蚂金矿床位于西秦岭凤太矿集区西北部,其成矿作用过程可分为早期石英-碳酸盐阶段、主成矿期石英-碳酸盐-金属硫化物阶段和晚期石英阶段。各阶段流体包裹体测试结果表明,成矿流体为中温（240～300℃）、中低盐度（4%～10%NaCl）的富CO2流体,从早阶段到晚阶段,成矿温度和盐度均逐渐降低,主成矿阶段流体包裹体类型的多样性是流体不混溶的结果。与相邻的八卦庙、丝毛岭金矿床的稳定同位素对比分析表明,三者的成矿流体具有相似性,均具有深部来源的特征。柴蚂金矿床的成矿过程与脆韧性剪切带的演化密切相关,来自深部的流体沿剪切系统向上运移过程中与浅部流体混合,并与围岩发生交代蚀变作用,由于物理化学条件的改变,成矿物质最终在构造扩容空间中富集成矿。The Chaima gold deposit is located on the northwest of the Fengtai ore concentration area in western Qinling.The gold mineralization can be divided into three stages：the early quartz-carbonate stage,the main quartz-carbonate-sulfide stage and the late quartz stage.Studies on fluid inclusions of each stage show that the ore-forming fluids are characterized by the intermediate-low salinity（4%～10% NaCl）CO2-H2 O system with intermediate temperature（240～300℃）.The temperature and salinity decreased from the early stage to the late stage.The diversity of fluid inclusion types in the main stage resulted from the fluid immiscibility.By contrast with the Baguamiao and Simaoling gold deposits nearby,stable isotope studies indicate that ore-forming fluids of the three deposits derived from the same deep source.The mineralization process of the Chaima gold deposit was closely related to brittle-ductile shear zone.The deep fluids flew upward along the shear system,and mixed with the shallow fluids,and experienced the replacement with country rocks.Finally,metallogenic materials concentrated and deposited within the structural dilation space due to the change of physical-chemical conditions.

关 键 词：流体包裹体 稳定同位素 柴蚂金矿床 凤太矿集区 

分 类 号：P618.51[天文地球—矿床学]