云南毛坪铅锌矿床横向断裂构造控矿特征及其找矿意义  

Controlling of the Transverse Faults on the Mineralization and Its Prospecting Implication in the Maoping Pb-Zn Deposit,Yunnan Province

作　　者：赵德顺 赵伟策 王书来[2] 祝新友 蒋斌斌 ZHAO Deshun;ZHAO Weice;WANG Shulai;ZHU Xinyou;JIANG Binbin(China Copper Mineral Resources Limited Company,Kunming,Yunnan 650051;Beijing Institute of Geology forMineral Resources,Co.,Ltd.,Beijing 100012;Sino-Zijin Resources,Co.,Ltd.,Beijing 100012)

机构地区：[1]中铜矿产资源有限公司技术中心,云南昆明650051 [2]北京矿产地质研究院有限责任公司,北京100012 [3]中色紫金地质勘查(北京)有限责任公司,北京100012

出　　处：《地质与勘探》2023年第1期1-11,共11页Geology and Exploration

基　　金：中铜矿产资源有限公司重点科技计划项目(编号:2004YZKC006)资助。

摘　　要：云南毛坪铅锌矿床位于著名的川滇黔铅锌成矿带的北部,严格受地层岩性与断裂构造控制。矿体主要赋存于上泥盆统宰格组与上石炭统黄龙组白云岩、白云质灰岩中,受控于近北东向毛坪逆断裂与石门坎倒转背斜。然而,近来野外地质调查发现,与区域主构造线(北东-南西走向)呈大角度相交的近南北向横向断裂与铅锌矿化也存在密切的联系。本文通过大比例尺地质填图与构造蚀变岩成矿元素地球化学分析,从地质与地球化学两方面论证了该类横向断裂几何学与运动学特征及其与铅锌矿化、热液蚀变的关系。构造解析表明,毛坪铅锌矿床横向断裂表现为近南北走向、陡倾向东的正断层;成矿元素地球化学分析结果显示,近南北向断裂带的构造蚀变岩具有极其显著的Pb、Zn异常以及较明显的Ge、Cd、Ga、In异常。结合前人研究成果,认为近南北向横向断裂控制了白云石化、热液角砾岩化、铅锌矿化的空间产状与展布,是主要的导矿构造;近北东向石门坎背斜的层间破碎带是主要的容矿构造。The Maoping lead-zinc deposit in Yunnan Province is located in the northern part of the famous Sichuan-Yunnan-Guizhou lead-zinc metallogenic province,and is strictly controlled by the lithology and fault structures.The deposit is hosted in the dolostone and dolomitic limestone of the Upper Devonian Zaige Formation and Upper Carboniferous Huanglong Formation,controlled by the NE-striking Maoping thrust and Shimenkan inverted anticline.However,recent filed investigation suggests that the N-S-striking transverse faults,intersecting the regional tectonic line(NE-SW-striking)at large angles,also have a close relationship with the lead-zinc mineralization.Based on large-scale geological mapping and geochemical analysis of ore-forming elements of tectonically altered rocks,this paper demonstrates the geometric and kinematic characteristics of transverse faults and their relationship with lead-zinc mineralization and hydrothermal alteration from both geological and geochemical aspects.The structural analysis indicates the transverse faults in the Maoping deposit are represented by the N-S-striking and E-dipping normal faults.The geochemical analysis of the ore-forming elements shows that the tectonic-altered rocks from the N-S-striking transverse faults have extremely significant Pb and Zn anomalies,as well as relatively obvious Ge,Cd,Ga,and In anomalies.Combined with previous studies,it is suggested that the N-S-striking transverse faults control the spatial occurrence and distribution of the dolomitization,hydrothermal brecciation,and lead-zinc mineralization,and are the dominant ore-conducting structures,while the interlayer fractures in the Shimenkan anticline are the major ore-bearing structures.

关 键 词：横向断裂 构造特征 成矿元素地球化学 毛坪铅锌矿床 云南 

分 类 号：P624[天文地球—地质矿产勘探]