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
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国家自然科学基金项目(面上项目,重点项目,重大项目)


Genesis of the Chaima Gold Deposit in the Fengtai Ore Concentration Area, Western Qinling: Constrained by Fluid Inclusion and Stable Isotope Results
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    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(4~10wt%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。

    Abstract:

    The Chaima gold deposit is located on the northwest of the Fengtai ore concentration area in western Qinling. The gold mineralization could 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 (4~10wt%NaCl) CO2-H2O system with intermediate temperature (240~300℃). The temperature and salinity are decreased from the early stage to the late stage. The diversity of fluid inclusion types in the main stage is 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 are derived from the same deep source. The mineralization process of the Chaima gold deposit is closely related to brittle-ductile shear zone. The deep fluids flow upward inside the shear system, and mixed with the shallow fluids, and experience the replacement with country rocks. Finally, metallogenic materials concentrated and deposited within the structural dilation space due to the change of physical-chemical conditions.

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刘协鲁,王义天,刘敏,胡乔青,魏然,陈绍聪,张娟,王瑞廷,李建华,温深文,陈明寿,彭洛宏.2015.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[J].地质学报,89(5):873-888.
LIU Xielu, WANG Yitian, LIU Min, HU Qiaoqing, WEI Ran, CHEN Shaocong, ZHANG Juan, WANG Ruiting, LI Jianhua.2015. Genesis of the Chaima Gold Deposit in the Fengtai Ore Concentration Area, Western Qinling: Constrained by Fluid Inclusion and Stable Isotope Results[J]. Acta Geologica Sinica,89(5):873-888.

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  • 收稿日期:2014-10-27
  • 最后修改日期:2014-12-28
  • 录用日期:2014-12-29
  • 在线发布日期: 2015-05-14
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