IMPACT OF THE DIFFERENCES OF LOCAL TECTONIC ENVIRONMENT EVOLUTION TO MINERALIZATION:A Case Study of the Dongwujiazi and Paishanlou Gold Deposits in Western Liaoning
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摘要: 辽西地区东五家子金矿与排山楼金矿空间位置相距较近，同属华北陆块北缘东段，且均产于新太古代变质表壳岩-深成岩组合岩系中.然而，东五家子金矿作为石英脉型金矿的代表，与以排山楼金矿为代表的韧性剪切带蚀变岩型金矿在成矿机制、成矿时代及成矿特征等方面均存在较大差别.通过对比分析上述2个金矿的矿床特征，认为局部构造环境演化差异性造成了二者成矿的不同.与此同时，内蒙地轴宝国老隆起石英脉型金矿密集分布的格局与燕山褶皱带北镇隆起韧性剪切带蚀变岩型金矿稀疏分布的格局，这一鲜明反差现象也依据“波的传导”理论得到了较好的解释.与宝国老隆起具有相似局部构造环境的旧庙隆起已发现金矿点稀少，且存在明显Au化探异常，因而有望在该区域发现“东五家子式”金矿.Abstract: The Dongwujiazi gold deposit and Paishanlou gold deposit in Western Liaoning Province are distributed closely. Both tectonically belong to the eastern section of the north margin of North China Block, occurring in the Neoarchean metamorphic supracrustal rock and plutonic rock series. However, the two deposits have significant differences in metallogenic mechanism, epoch and characteristics. After comparing the characteristics of the two deposits, we believe that the different local tectonic environment evolutions resulted in the diversity of mineralization. Meanwhile, the theory of "wave transmission" can well explain the phenomenon of concentrated distribution pattern of quartz-vein type gold deposits in Baoguolao Uplift of Inner Mongolia Axis versus sparse distribution pattern of ductile shear zone altered rock type gold deposits in Beizhen Uplift of Yanshanian Fold Belt. Finally, the Jiumiao Uplift, which shares similar local tectonic environment to Baoguolao Uplift, has few gold deposits but obvious geochemical Au anomaly. Therefore it is possible to find gold deposits of "Dongwujiazi style" in this area.
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