青海锡铁山铅锌矿床喷流管道相识别、控矿作用及其对矿床成因和找矿勘查意义  

Identification of the Submarine Exhalative Conduct and Its Significances for Ore-Controlling,Genesis and Ore-Finding,Xitieshan Pb-Zn Deposit,Qinghai Province

作　　者：钟永生[1] 孙华山[2] 葛风建 孙利[1] 凡欠荣 王如意 张得龙 Zhong Yongsheng;Sun Huashan;Ge Fengjian;Sun Li;Fan Qianrong;Wang Ruyi;Zhang Delong(Western Mining Incorporated Company,Xining 810001,China;Faculty of Earth Resource,China University of Geosciences（Wuhan）,Wuhan 430074,China;Fujian Insititue of Geological Survey,Fuzhou 350013,China)

机构地区：[1]西部矿业股份有限公司,西宁810001 [2]中国地质大学(武汉)资源学院,武汉430074 [3]福建省地质调查研究院,福州350013

出　　处：《地质科技情报》2018年第5期154-161,共8页Geological Science and Technology Information

基　　金：西部矿业地质科研项目"青海省锡铁山铅锌矿区深部及外围找矿预测研究";国家自然科学基金项目(41172087)

摘　　要：锡铁山铅锌矿床位于柴达木盆地北缘中段,有关该矿床成因问题一直存在争议。矿床成因认识直接影响到控矿因素的选择,进而决定着成矿规律研究和找矿方向的判断。基于地质调查及岩心编录、岩相学特征、勘探图件和硫同位素组成综合分析,在锡铁山矿区识别出3处海底喷流管道相,位置大致与矿区横切滩间山群的沟谷相当。在喷流管道相内部,深部热液隐爆流纹质角砾岩、中部蚀变岩和上部(复成分)角砾矿石构成了"喷流管道三位一体"内部结构。并且,基于3处喷流管道相特征,恢复了锡铁山矿区早期海底喷流作用过程。围绕喷流管道附近铅锌矿化集中发育,深部热液隐爆流纹质角砾岩控制着矿体底界深度和矿区矿体总体SE侧伏趋势,矿区SE侧中间沟深部应是近期找矿工作的重点。The Xitieshan lead-zinc deposit is located in the middle of the northern margin of the Qaidam Basin,while there have been controversies regarding the genesis of the deposit.The understanding of the genesis of deposits directly affects the choice of ore-controlling factors,which in turn determines the study of metallogenic regularity and the direction of prospecting.Integrating geological survey,drill-core logging,petrography,with exploration maps and sulfur isotope characteristics,this work identifies three submarine exhalative conductive locations,which roughly match with three gorges cross-cutting Tanjianshan Group in Xitieshan Pb-Zn ore deposit,Qinghai Province.The exhalative conduct consists of hydrothermal cryptoexplosive breccia in deep,altered rocks in middle and polymictic breccia ores in upper,named as Trinity.In addition,based on the characteristics of the exhalative conduct,the early seafloor exhalation process in Xitieshan lead-zinc deposit was reconstructed.Mineralization rich is around the exhalative conduct,in particular,the cryptoexplosive rhyolitic hydrothermal breccia controls the bottom of the orebody and lateral plunging toward southeastern.Accordingly,the deep area of Zhongjiangou is delineated as the first ore-finding target at present.

关 键 词：喷流管道 矿床成因 控矿作用 找矿意义 锡铁山铅锌矿床 

分 类 号：P618.42[天文地球—矿床学] P618.43[天文地球—地质学]