内蒙古东珺铅锌银矿床地质特征及成因探讨  

Geological Characteristics and Genesis of the Dongjun Pb-Zn-Ag Deposit in Inner Mongolia

作　　者：梁玉伟 张斌 田京[3] 李进文[3] 佘宏全[3] 杨郧城[3] 

机构地区：[1]内蒙古第一地质矿产勘查开发院,内蒙古呼和浩特010020 [2]中铁资源地质勘查有限公司,北京100039 [3]中国地质科学院矿产资源研究所,北京100037

出　　处：《现代地质》2014年第6期1112-1121,共10页Geoscience

基　　金：中国地质调查局地质调查项目(1212011085260);科技部"973"项目(2013CB428805);内蒙古地质勘查重大科研项目(内地研2004-07)

摘　　要：在矿床地质、地球化学特征研究的基础上,讨论了内蒙古东珺铅锌银矿床的成因。地球化学研究表明:矿区岩浆岩属于钙碱性岩石系列,轻稀土和大离子亲石元素相对富集;矿石与岩浆岩稀土元素配分模式相似,矿石、矿化蚀变岩、火山岩和二长斑岩的K、Th、U、Rb均具有明显的正异常,Ta、Nb均显示负异常,暗示本矿区各种岩石具有相同的源区,主要来源于富集大离子亲石元素的富集地幔,可能有少量地壳物质的混染。矿石中金属硫化物Pb、S同位素研究表明,成矿物质来源于岩浆系统。通过矿床地质及地球化学研究,认为东珺铅锌银矿为一与火山-次火山岩浆作用有关、受断裂构造控制的热液脉型矿床,成矿与中生代火山-次火山岩浆作用关系密切,NW向和NE向断裂构造为控矿和容矿构造。Based on the studies of the geological and geochemical characteristics,the genesis of the Dongjun lead-zinc-silver deposit in Inner Mongolia was discussed in this paper.Geochemical studies showed that the magmatic rocks belong to the calc-alkaline series,and their light rare earth and large ion lithophile elements are both relative enrichment.REE distribution modes are similar between ore and magmatic rocks,the content of K,Th,U and Rb elements showed obviously positive anomalies among the ore,altered rock,volcanic rocks and monzonite porphyry.On the contrary,the content of elements Ta and Nb showed negative anomalies. These indicated all kinds of rocks,have the same provenance in the deposit,were derived from the enriched mantle enriching large ion lithophile elements with a contamination of a little crustal material.Pb and S isotope studies of the metal sulfides showed the ore-forming materials were derived from magma system.According to the studies of the geological and geochemical characteristics,the Dongjun Pb-Zn-Ag deposit was considered to be a hydrothermal vein type deposit related to volcanic-subvolcanic magmatism.The mineralization is closely related to Mesozoic volcanic magmatism.The NW and NE trending fractures are the ore-bearing and ore-con-trolling structures.

关 键 词：铅锌银矿床 地质特征 成因 东珺 内蒙古 

分 类 号：P618.4[天文地球—矿床学] P618.5[天文地球—地质学]