大兴安岭南段多金属矿成矿作用和找矿潜力  

Poly-Metal Mineralization and Exploration Potential in Southern Segment of the Da Hinggan Mountains

作　　者：曾庆栋[1] 刘建明[1] 禇少雄 郭云鹏[1] 高帅[1] 郭理想[1] 翟媛媛[1] 

机构地区：[1]中国科学院地质与地球物理研究所/矿产资源研究重点实验室,北京100029

出　　处：《吉林大学学报（地球科学版）》2016年第4期1100-1123,共24页Journal of Jilin University：Earth Science Edition

基　　金：国家重点基础研究发展计划(国家"973"计划)项目(2013 CB429804);国家自然科学基金重大项目(41390443)~~

摘　　要：大兴安岭南段多金属成矿带位于中亚造山带东部贺根山断裂与西拉沐伦河断裂之间,处于古亚洲洋构造与古太平洋构造的叠加部位。具有双层结构特征(基底以二叠纪地层为主,盖层为侏罗纪早白垩世地层),发育了多期的构造、岩浆活动,以及众多的多金属矿床。区内矿床以多成矿元素共生、伴生为特点,按成矿作用特征划分为4个成矿系统(斑岩、矽卡岩、热液脉状、碱性花岗岩成矿系统)。斑岩成矿系统包括斑岩钼多金属、锡多金属2个亚成矿系统,矽卡岩成矿系统包括矽卡岩型铁锡、铅锌银2个亚成矿系统,热液脉状成矿系统包括银多金属、铜多金属、锡多金属3个亚成矿系统,碱性花岗岩成矿系统为稀有稀土成矿系统。大兴安岭南段多金属矿床形成于2个主要时期:晚二叠—世三叠纪、晚侏罗世—早白垩世。两期成矿作用均与花岗质岩浆活动密切相关,成矿物质来源既包括深部岩浆带来的物质,也包括区内地层,具有多来源特点。晚二叠—世三叠纪多金属矿床形成于古亚洲洋构造体系,晚侏罗世—早白垩世多金属矿床形成于古太平洋构造体系。优越的成矿地质条件及良好的地球物理与地球化学异常表明大兴安岭南段仍具有巨大的找矿潜力。The southern segment poly-metal metallogenic belt of the Da Hinggan Mountains（DHM）is located at the area between the Hegenshan fault and the Xilamulun fault in eastern Central Asia Orogenic belt,and also situated the superposition area caused by the paleo-Asia ocean tectonic system and paleo-Pacific ocean tectonic system.The southern segment poly-metal metallogenic belt of DHM is characterized by the bilayer structure（Permian basement,Jurassic-Early Cretaceous covers）,poly-stagetectonic-magma activities and numerous poly-metal deposits.The metal deposits are characterized by the associated poly elements.The metal deposits can be classified to four ore-forming system by the mineralization features：porphyry,skarn,hydrothermal vein and alkaline granite ore-forming systems.Porphyry ore-forming system includes Mo-poly metal and Sn-poly metal subsystems,skarn ore-forming system includes Fe-Sn and Pb-Zn-Ag subsystems,hydrothermal vein ore-forming system includes Agpoly metal,Cu-poly metal and Sn-poly metal subsystems.Alkaline granite ore-forming system is the rare and rare earth metal ore-forming system.The metal deposits in southern segment of DHM were mainly formed in two periods：Late Permian to Triassic and Late Jurassic to Early Cretaceous.Both periods mineralization is related to the granitic magmatism.The ore-forming materials were derived from multi-sources which including deep and strata sources.The Late Permian and Triassic poly metal deposits were formed in the paleo-Asia tectonic setting,the Late Jurassic and Early Cretaceous poly metal deposits were formed in the paleo-Pacific tectonic setting.The favorable metallogenic geological conditions,the good geophysical and geochemical anomalies indicate that the southern segment has still huge exploration potential.

关 键 词：有色金属 多金属矿 成矿系统 叠加 中生代 大兴安岭南段 

分 类 号：P618.4[天文地球—矿床学]