西秦岭寨上卡林型金矿南矿段综合找矿模型及地质意义  

Comprehensive Prospecting Modeland the Geological Significance for Zhaishang Carlin-Type Gold Deposit in West Qinling

作　　者：薛仲凯 李朋伟 常铭[3] 黄豪擎 XUE Zhongkai;LI Pengwei;CHANG Ming;HUANG Haoqing(Xi an Mineral Resources Survey Center of China Geological Survey,Xi an 710100,Shaanxi,China;Langfang Comprehensive Survey Center of NaturalResources,China Geological Survey,Langfang 065000,Hebei,China;China University of Geosciences(Beijing),College of Geosciences and Resources,Beijing 100083,China;Research Center of Applied Geology of China Geological Survey,Chengdu 610036,Sichuan,China;School of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610036,Sichuan,China)

机构地区：[1]中国地质调查局西安矿产资源调查中心,陕西西安710100 [2]中国地质调查局廊坊自然资源综合调查中心,河北廊坊065000 [3]中国地质大学(北京),地球科学与资源学院,北京100083 [4]中国地质调查局应用地质研究中心,四川成都610036 [5]成都理工大学,环境与土木工程学院,四川成都610036

出　　处：《西北地质》2021年第3期174-187,共14页Northwestern Geology

基　　金：中国地质调查局“甘肃岷县寨上马坞金矿整装勘查区关键基础地质研究”(12120114050301);“北山地区月牙山合黎山一带萤石铜钼矿调查评价”(DD20211552)。

摘　　要：寨上金矿床位于西秦岭地区,是中国卡林类卡林金矿床的最重要的富集地之一。寨上金矿矿体赋存于板岩与灰岩接触界面及板岩一侧破碎带内,围岩蚀变主要发育硅化、黄铁矿化、毒砂化和褐铁矿化等,可作为直接的找矿标志;可控源音频大地电磁测量显示H1高阻异常和L2低阻异常间的电性梯度带对应32号脉,表明在电性梯度带内含矿的可能性很大;剖面原生晕分带序列为As Mo Sb Ag Cu Bi Au Zn W Pb;前缘晕元素为Pb、Sb,近矿晕元素为Au、Ag、As、W,尾晕元素为Mo、Cu、Bi、Zn,尾晕元素Mo、Bi分别位于序列的前缘晕和近矿晕元素位置,近矿晕元素Pb位于序列的尾晕元素位置,表明浅部矿体有可能被风化剥蚀,深部有可能存在盲矿体;根据地球物理、地球化学信息特征和矿床地质特征、控矿因素及找矿标志,建立了综合找矿模型。并在南矿段进行钻孔验证,取得较好的找矿效果。Zhaishang gold deposit,located in west Qinling,is one of the most important enrichment places of Carlin gold deposits in China.The orebody of Zhaishang gold deposit occurs in the interface between slate and limestone and in the fracture zone on one side of slate.The surrounding rock alteration mainly develops silicification,pyrite,arsenopyrite and limonite mineralization,which can be used as a direct indicator of ore prospecting.Controlled source audio magnetotelluric survey shows that the electrical gradient zone between H1 high resistivity anomaly and L2 low resistivity anomaly corresponds to 32 vein,indicating the great possibility of ore-bearing in the electrical gradient zone.The primary halo zoning sequence of the section is As Mo Sb Ag Cu Bi Au Zn W Pb.The leading edge halo elements are Pb and Sb;the near ore halo elements are Au,Ag,As,W;the tail halo elements are Mo,Cu,Bi,Zn.Tail halo elements Mo and Bi are respectively in the leading edge halo and near ore halo elements,and the near ore halo element Pb is in the tail halo element position of the sequence,which indicate that the shallow orebody may be weathered and denuded,and there may be blind orebodies in the deep.A comprehensive prospecting model is established based on the geophysical and geochemical information,the geological characteristics of ore deposits,the ore-controlling factors and the prospecting criteria.The drilling verification in the south section of mine received good prospecting effect.

关 键 词：大地音频电磁测量 格里格良法 综合找矿模型 寨上金矿 

分 类 号：P618.51[天文地球—矿床学]