辽宁二道沟金矿构造叠加晕特征及深部找矿预测  

Characteristics of Structural Superimposed Halos and Deep Prospecting Prediction in Erdaogou Gold Deposit,Liaoning Province

作　　者：温佳伟 史鹏亮 刘彦兵 张静[1] 屈海浪 李元申 胡博心 缪广 WEN Jiawei;SHI Pengliang;LIU Yanbing;ZHANG Jing;QU Hailang;LI Yuanshen;HU Boxin;MIAO Guang(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China;Beijing Jinyou Geological Exploration Co.,LTD,Beijing 100011,China)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]北京金有地质勘查有限责任公司,北京100011

出　　处：《现代地质》2020年第6期1291-1302,共12页Geoscience

基　　金：中国黄金集团有限公司地质科研项目(WKY201701);高等学校学科创新引智计划(“111”计划)项目(BP0719021)。

摘　　要：辽宁二道沟金矿为赋存在陆相火山岩中的岩浆热液型矿床,矿脉严格受构造控制。为了研究1号和3号矿体的构造叠加晕特征并预测深部延伸情况,本研究系统采集分析450 m至-305 m中段样品,对2条矿体的特征指示元素、构造叠加晕轴向分带序列、构造叠加晕异常下限和地球化学参数进行了研究。结果表明:矿体前缘晕特征指示元素为Sb、Hg,近矿晕特征指示元素为Au、Ag、Cu、Pb,尾晕为Co、Ni。1号和3号矿体构造叠加晕轴向分带序列由上至下分别为Co→Sb→Cu→Au→Hg→Ni→Pb→Ag和Ag、Cu→Hg→Au→Pb→Sb→Co、Ni,结合地球化学参数确定了1号矿体在370 m、130 m、-215 m中段附近发生矿体叠加,3号矿体在-125 m和-215 m中段附近发生矿体叠加,并据此建立了2条矿体的构造叠加晕理想模型。构造叠加晕异常特征图显示1号矿体在-215 m中段深部前缘晕和近矿晕异常强度大,尾晕异常强度小,3号矿体在-215 m中段深部前缘晕、近矿晕和尾晕异常强度都较大,指示1号矿体在-215 m中段以深仍有很大延伸,而3号矿体向深部仍有一定延伸。Erdaogou gold deposit in Liaoning Province is a magmatic-hydrothermal deposit hosted in continental volcanic rocks,orebodies are strictly controlled by structures.In order to study the characteristics of structural superimposed halos and predict the extension of No.1 and No.3 orebodies,this paper systematically studied the characteristic indicator elements,structural superimposed halos axial zoning sequences,anomaly threshold and geochemical parameters of the samples at the 450 m to-305 m depth.The results show that the indicator elements are Sb and Hg for front-ore halos,Au,Ag,Cu and Pb for near-ore halos,Co and Ni for late-ore halos,respectively.From top to bottom,the axial zoning of superimposed halos are Co→Sb→Cu→Au→Hg→Ni→Pb→Ag for No.1 orebody,Ag and Cu→Hg→Au→Pb→Sb→Co and Ni for No.3 orebody.These geochemical parameters indicate that the No.1 orebody was respectively superimposed at 370 m,130 m,-215 m depth and the No.3 orebody was superimposed at-125 m,-215 m depth,based on this,we established the ideal models of structural superimposed halos.The anomaly characteristic map of structural superimposed halos shows that the anomaly intensity of front-ore halos and near-ore halos are large,while late-ore halos are small of No.1 orebody at-215 m depth.The anomaly intensity of front-ore halo,near-ore halo and late-ore halo of No.3 orebody are larger at-215 m depth.To sum up,we deduce that the No.1 orebody still has a great extension below-215 m depth,while the No.3 orebody has a certain extension deep down.

关 键 词：构造叠加晕 特征指示元素 轴向分带序列 地球化学参数 

分 类 号：P618.51[天文地球—矿床学] P632[天文地球—地质学]