广西大厂铜坑锡多金属矿床Pb同位素组成对成矿物质来源的示踪  

Lead isotope composition on tracing ore-forming materials of Dachang Tongkeng tin polymetallic deposit,Guangxi

作　　者：李晔 邵主助 蔡明海 胡志戍 张含 苑宏伟 LI Ye;SHAO Zhuzhu;CAI Minghail;HU Zhishu;ZHANG Han;YUAN Hongwei(College of Resources Environment and Materials,Guangxi University,Nanning 530004;Materials and Energy Branch of Southwvest Engineering Co.,Led.of China Communications Construction First Narigation Engineering Bureau,Yulin 537000)

机构地区：[1]广西大学资源环境与材料学院,南宁530004 [2]中交一航局西南工程有限公司物资能源公司,玉林537000

出　　处：《矿产勘查》2020年第3期442-451,共10页Mineral Exploration

基　　金：广西大厂锡石硫化物型锡矿科学基地研究项目(编号:200911007-13)资助。

摘　　要：广西大厂铜坑矿床是我国超大型锡多金属矿床,包括锡多金属矿体和锌铜矿体两类。根据Pb同位素组成及其特征参数图解,上部锡多金属矿石铅表现为壳幔混源铅的特征,深部锌铜矿石铅主要源自上地壳,两者铅源都来自于花岗岩、泥盆系地层及基底铅的混合。区内成岩成矿形成于与燕山期俯冲造山有关的挤压至伸展的构造转换环境,并伴随岩浆活动,岩浆活动除从深部带来成矿物质外,并且驱动地层中的成矿物质,使其活化、迁移,随后在相对开放的构造裂隙系统充填交代围岩,从而形成锡多金属矿床。The Dachang Tongkeng deposit is a very large tin polymetallic deposit in China,including tin polymetallic ore body and zinc copper body. According to the diagram of Pb isotope composition and its characteristic parameters,the lead of tin polymetallic ore in the upper part is characterized by the mixed lead of shell and mantle,while the lead of zinc and copper ore in the deep part mainly comes from the upper crust,both of which come from the mixed lead of granite,devonian strata and basement. Diagenetic mineralization in the area formed in the related to yanshanian subduction orogenic extrusion to extend structural transformation of the environment,and with magma activity,magmatic activity except from deep ore-forming materials,and drive the formation of ore-forming material,make its activation,migration,then in a relatively open system of structural fissure filling metasomatic advantageous surrounding rock,forming a tin polymetallic deposit.

关 键 词：铜坑矿床 PB同位素 成矿物质 岩浆活动 大厂 广西 

分 类 号：P61.43[天文地球—矿床学] P61.41[天文地球—地质学]