广西寒武系地层建造边缘铅锌矿床成矿构造岩相特征及其找矿意义  

Characteristics of Metallogenic Tectonic Lithofacies of Lead-Zinc Deposits on the Edge of Cambrian Stratigraphic Formation in Guangxi and Their Prospecting Significance

作　　者：周国发 梁标志 周伟金 吕古贤[3] 韦安伟 张培才 王磊 陈彪 陆济璞 肖昌浩 ZHOU Guofa;LIANG Biaozhi;ZHOU Weijin;LÜGuxian;WEI Anwei;ZHANG Peicai;WANG Lei;CHEN Biao;LU Jipu;XIAO Changhao(Guangxi Bureau of Geology and Mineral Prospecting and Exploitation,Nanning,Guangxi 530023;Geological Survey of Guangxi,Nanning,Guangxi 530023;Laboratory of Dynamic Diagenesis and Metallogenesis,Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081)

机构地区：[1]广西地质矿产勘查开发局,广西南宁530023 [2]广西地质调查院,广西南宁530023 [3]中国地质科学院地质力学研究所动力成岩成矿实验室,北京100081

出　　处：《地质与勘探》2023年第5期946-960,共15页Geology and Exploration

基　　金：广西矿产志资金(编号:DD20190379-19);广西关键矿产资源深部勘查人才小高地资金(编号:桂组通字[2019]85号);广西沉积型铝土矿成矿理论研究和找矿突破关键技术研发与示范(编号:桂科AB21196028);广西科技基地和人才专项广西地矿局院士工作站(编号:AD17129052);广西栗木-珊瑚矿集区找矿预测项目(中国地质调查局发展研究中心,编号:DD2016005218);广西马江地区矿产地质调查(中国地质调查局,编号:12120113066600)联合资助。

摘　　要：广西寒武系地层建造边缘铅锌矿床主要分布于沉积不整合面之上古风化壳或碳酸盐岩建造中,呈浅成中-低温热液类型,具有多阶段成矿及围岩蚀变分带特征。通过成矿构造岩相特征分析,认为矿床成矿建造以碳酸盐岩地层有利岩性、层间滑脱面或层间破碎带叠加区域大断裂为主,控制着层状矿体空间分布,古风化壳层、区域大断裂伴生的次级断裂次之,控制着脉状矿体的空间分布。成矿物质主要来源于生物碎屑岩中的元素迁移。矿床围岩蚀变可划分为强蚀变岩带和弱蚀变岩带,强蚀变岩带蚀变以黄铁矿化、毒砂矿化、硅化、白云岩化、方解石化为主,偶见重晶石化、绢云母化、铅锌矿化。弱蚀变岩带蚀变以黄铁矿化、毒砂化、方解石化为主,偶见重晶石化。地质找矿标志为方解石脉、重晶石脉、蚀变岩带及古风化壳与断裂构造交汇部位。地球化学找矿标志为Pb、Zn、Cd、Hg、As、Ba等元素异常的出现。The lead-zinc deposits on the edge of Cambrian stratigraphic formation in Guangxi are mainly distributed in the upper paleoweathering crust or carbonate rock formation of sedimentary unconformity,which are of hypabyssal medium-low temperature hydrothermal type,characterized by multi-stage mineralization and wall rock alteration zoning.The analysis of the characteristics of minerogenetic tectonic lithofacies,suggests that the ore formation of the deposits is dominated by favorable lithology of carbonate rock,interlayer decollement or interlayer fracture zone with superimposed regional large fault,which control the spatial distribution of layered ore bodies,followed by secondary faults associated with ancient weathered crust and regional large fault controlling the spatial distribution of veined ore bodies.The ore-forming materials mainly come from the migration of elements in biological clastic rock.The wall rock alteration of the deposits can be divided into strong alteration rock zone and weak alteration rock zone.The strong alteration rock zone is dominated by pyritization,arsenopyritization,silicification,dolomitization,calcitization,and occasionally baritization,sericitization,and lead-zinc mineralization.The alteration of weakly altered rock belt is dominated by pyritization,arsenopyritization,calcitization,and occasionally baritization.The geological prospecting marks are calcite vein,barite vein,altered rock belt and the intersection of ancient weathering crust and fault structures.The geochemical prospecting indicator is the occurrence of Pb,Zn,Cd,Hg,As,Ba and other element anomalies.

关 键 词：构造岩相 浅成中-低温热液矿床 寒武系地层建造 围岩蚀变 找矿标志 广西 

分 类 号：P612[天文地球—矿床学] P618.4[天文地球—地质学]