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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 Chaidan gold deposit is located in the northwestern part of the Fengtai ore district in the West Qinling. Its metallogenic process can be divided into the early quartz-carbonate stage, the main mineralization quartz-carbonate-metal sulfide phase and the late quartz stage. The results of fluid inclusion tests at various stages indicate that the ore-forming fluid is a CO2-rich fluid with medium-temperature (240-300 ℃) and medium-low salinity (4% -10% NaCl). From the early stage to the late stage, Degrees gradually decreased, the type of fluid inclusions in the main metallogenic stage is the result of fluid immiscibility. Compared with the adjacent Baguamiao and Silurian gold deposits, the stable isotope analysis shows that the metallogenetic fluids of the three have similarities and all have the characteristics of deep source. The mineralization process of Chaidan gold deposit is closely related to the evolution of brittle-ductile shear zone. The fluid from the deep part mixes with the shallow fluid during the upward migration of the shear system and exchanges alteration with the surrounding rock. Changes in chemical conditions, mineralization material eventually enriched in the structure of space expansion of mineralization.