易门狮子山铜矿床构造岩微量元素特征及构造地球化学异常模式  

Trace Elements Characteristics of the Tectonites and Tectonogeochemical Exploration Model for the Shizishan Copper Deposit in Yimen,Yunnan

作　　者：李强 韩润生[1] 黄应才[2] 李德[2] 

机构地区：[1]昆明理工大学国土资源工程学院；有色金属矿产地质调查中心西南地质调查所,云南昆明650093 [2]玉溪矿业有限公司,云南玉溪653100

出　　处：《大地构造与成矿学》2011年第1期149-155,共7页Geotectonica et Metallogenia

基　　金：国家危机矿山项目(编号:200653057;20089943);国家科技支撑项目(编号:2006BAB01B09);云南省科技创新团队项目(2010)资助

摘　　要：易门狮子山铜矿床位于昆阳裂谷易门裂陷盆地内,属沉积-改造型中型铜矿床。矿体主要赋存于落雪组白云岩中,并严格受狮子山背斜及北东向压扭性断裂控制。应用构造地球化学方法,重点研究了断裂构造岩微量元素分布特征及其异常分带规律,结果表明:断裂破碎带矿化蚀变强烈,构造岩中Cu、Bi、Mo、Co、Mn、Ag、Pb等成矿元素富集;矿床具有自上而下的轴向分带序列Ba-Mn-Ag-Zn-Cu-Pb-Co-Bi-Mo;横向上Cu-Bi-Mo-Co-Mn为矿体的近矿指示元素,Ag-Pb为远程指示元素;纵向上从矿床东部至西部,矿化强度及异常规模明显减弱,反映了该类型矿床分带明显的特征。根据地球化学找矿标志,3～8号勘探线间近矿晕规模大,是深部隐伏矿的主要靶区。The Shizishan copper deposit located inside the Yimen rift basin of Kuanyang Rift is a medium sized sedimentary-reformation type copper deposit. The main ore-bodies are hosted in the Luoxue Formation dolostone and constrained by the Shizishan anticline and NE-trending compresso-shear faults. Tectonogeochemical investigation shows that the fault zone is intensively mineralized,and the ore metals such as Cu,Bi,Mo,Co,Mn,Ag,Pb are especially enriched in the tectonites. The deposit is strongly zoned,axial zonation is Ba-Mn-Ag-Zn-Cu-Pb-Co-Bi-Mo downwards,while the sidelong zonation is Cu-Bi-Mo-Co-Mn,and Ag-Pb are peripheral indicators of ore mineralization. The intensity of mineralization and ore metal anomaly decreases westwards in the ore field,which may be caused by the obvious zonation of the deposit. Our geochemical exploration model suggests that the area in-between the No. 3 and No. 8 exploration line is likely the most plausible target for ore-bodies at depth.

关 键 词：构造岩 微量元素 构造地球化学异常模式 狮子山铜矿床 云南易门 

分 类 号：P542[天文地球—构造地质学] P595[天文地球—地质学]