甘肃岗岔金矿3号矿脉原生晕分带特征及其找矿意义  

Primary halo zoning of No. 3 ore vein in the Gangcha gold deposit of Gansu and its ore-proepecting significance

作　　者：鲍霖 申俊峰[1] 曹卫东 薄海军 李金春[2] 李可[1] 王佳新[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]惠天然矿业有限公司,甘肃兰州730000

出　　处：《物探与化探》2014年第4期660-666,共7页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(41072070)

摘　　要：对岗岔金矿第3号金矿脉进行了地球化学多元素及相关性分析,结合我国多个金矿地球化学原生晕元素组合规律和该矿单元素衬值的分布特点,确定岗岔金矿3号金矿脉的特征元素组合为:Au-Ag-Pb-Zn是近矿晕元素组合;Hg-As是前缘晕元素组合;Bi-Co-Cu-Ni是尾晕元素组合。根据上述元素组合特点进行3号金矿脉原生晕空间分带和叠加规律分析,结果表明轴向分带规律和叠加特点非常明显,显示该脉成矿具有向南侧伏的特点,且侧伏延伸方向叠加晕尚未封闭。基于以上分析结果,推测该矿深部向南仍有很大找矿前景。Located in Luqu-Chengxian thrust nappe tectonic zone of Qinling orogenic belt,the Gangcha gold deposit is a typical tectonic alteration rock type gold deposit. The surface of the ore deposit controls five ore veins,which vertically extends for over 500 m,with their proven reserves reaching nearly 19 tons. Among them,the third vein is the largest gold vein,which extends almost in north-south direction,with an outcropped length of more than 1 km,an average grade of 2. 99 × 10- 6,and an average thickness of 2.91 m. Based on field investigation,the authors made an analysis of the geochemistry of various elements in relation to the ore veins. Combined with the association regularities of the general geochemical primary halo elements and the distribution characteristics of the single element contrast,the authors determined the element combination characteristics of No. 3 ore vein as follows： Au-Ag-Pb-Zn is the near-ore hole element association,Hg-As is the front halo element association,and Bi-Co-Cu-Ni is the rear halo element association. Based on the above element association characteristics,the authors analyzed the primary halo of the third vein,and the result shows that the characteristics of the axial zonation and superposition are obvious,the mineralization of the vein has southward characteristics,and the superimposed halo has not yet been closed in the extending direction. The authors thus infer that the good prospecting potential may exist in the southern depth of the ore deposit.

关 键 词：原生晕 深部预测 构造蚀变 岗岔金矿 甘肃 

分 类 号：P632[天文地球—地质矿产勘探]