河南熊耳山干树金矿成矿作用与围岩蚀变特征  

The characteristics of wall rock alteration and mineralization of the Ganshu gold deposit in Xionger mountain area,Henan province

作　　者：郝晓圆[1] 宋凯[1] 牛树银[1] 汪江河[2] 赵春和[2] 施强[2] 

机构地区：[1]石家庄经济学院,石家庄050031 [2]河南省地质矿产勘查开发局第一地质矿产调查院,河南洛阳471023

出　　处：《地质找矿论丛》2015年第1期75-80,共6页Contributions to Geology and Mineral Resources Research

基　　金：河南省国土资源厅地质科研项目(编号:20116227);公益性行业科研专项经费项目(编号:200911007)联合资助

摘　　要：干树金矿是河南熊耳山矿集区内的构造蚀变岩型金矿,矿区的金矿体主要赋存在构造蚀变岩带内,且与多阶段的热液活动密切相关。深源的含金成矿流体沿深大断裂向上运移,在温度、压力控制下,在构造的有利部位与围岩发生交代作用,形成多种围岩蚀变和金矿化。其中,硅化、绢云母化、黄铁绢英岩化、钾化与金矿化关系密切;围岩蚀变具有水平分带和垂直分带特征:从中心向两侧,蚀变依次为黄铁绢英岩化→石英绢云母化→钾化→绢云母化→绿泥石化,金品位呈逐步降低的分布规律;从地表向深部,则出现蚀变为褐铁矿化-高岭土化-硅化-碳酸盐化-绢云母化-钾化-黄铁矿化-黄铁绢云岩化,金品位呈由低转高的变化趋势。Ganshu gold deposit is the altered cataclastic rock type Au deposit in the ore-deposit-clustered of Xionger Mountain area. Ore bodies occur mainly in the altered cataclastic rock zones and are close ly related to multi-staged hydrothermal activities. Deep Au-bearing hydrothermal fluid moves upward through big fault. With control of temperature and pressure metasomatism takes place between the fluid and the enclosing rocks at the structurally favorite places and various wall rock alterations and mineraliza- tion formed. Silicification, sericitization, beresitization and K-alteration are related to Au mineralization and the alterations are zoned vertically and horizontally. From center to either sides distribution of the al- teration is beresitization→quartz-sericitizaztion → K-alterarion → sericitization → chloritization and gold grade decreases gradually; from surface to depth the distribution is limonitization→kaolinitization→silici- fication→carbonatization→sericitization→K alteration→pyritization→beresitization and Au grade tends to increase.

关 键 词：干树金矿 围岩蚀变 蚀变分带 金矿化 成矿作用 河南省 

分 类 号：P611[天文地球—矿床学] P618.51[天文地球—地质学]