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熊耳山地区康山金矿田地质特征及成矿模式

Geological characteristics and metallogenic patterns in Kangshan Gold Field in Xiong’ershan area

  • 摘要: 康山金矿田属于秦岭造山带的北部逆冲褶皱带,位于东西向马超营断裂与北东向上宫—星星印断裂的交汇处,矿体呈脉状、透镜状赋存于北东向次级断裂中,矿石类型主要为构造蚀变岩型及少量石英脉型,与金矿化关系最为密切的蚀变是硅化、碳酸盐化、黄铁绢英岩化。通过搜集康山金矿田内成矿流体包裹体、同位素地球化学等资料,并进行综合分析,认为成矿流体属于中低温度、低盐度、中等密度、含CO2的H2O-NaCl体系;成矿物质来自结晶基底太华岩群;大气降水与岩浆流体的混合,以及温度的降低是矿质沉淀的主要因素。结合区域成矿特征,建立了康山金矿田成矿模式。

     

    Abstract: Kangshan Gold Field,part of the north thrust fold zone of Qinling orogenic belt,is located at the intersection of EW Machaoying fault and NE Shanggong-Xingxingyin fault.The ore bodies are in veins and lens,occurring in NE secondary fault.The ores are mainly structural alteration rock type and partly quartz vein type.The alteration most closely related to gold mineralization is silicification,carbonatization,and beresitization.With collection and comprehensive analysis of the ore-forming fluid inclusion and isotopic geochemistry data within Kangshan Gold Field,the study takes that the ore-forming fluids belong to low temperature,low salinity,medium density,CO2 containing H2O-NaCl system;the ore-forming materials come from crystallized basement Taihua Group;atmospheric precipitation and magmatic fluid mixing and decreasing temperature are the main reasons for ore materials sedimentation.Based on regional metallogenic features,the metallogenic patterns in Kangshan Gold Field are established.

     

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