内蒙古大井锡多金属矿床脉岩的成矿与找矿意义
投稿时间:2010-10-13  修订日期:2010-11-29  点此下载全文
引用本文:张会琼.内蒙古大井锡多金属矿床脉岩的成矿与找矿意义[J].地质与勘探,2011,47(3):344-352
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作者单位
张会琼 中国地质大学(北京),北京 
基金项目:全国危机矿山接替资源找矿项目(项目编号200699105)资助。
中文摘要:[摘要]内蒙古大井大型锡多金属矿床是一个与次火山热液有关的脉状矿床,其成矿元素组合复 杂,具有亲氧(锡)和亲硫(铜铅锌银)两套成矿元素组合。矿区范围内脉岩发育,与成矿关系密切,可分 为霏细岩和英安斑岩两大类。霏细岩以斑晶不发育、硅化绢云母化强烈及Eu 亏损明显等为特征,与早 期阶段的锡成矿有关;英安斑岩以斑晶发育、黄铁矿化强烈及Eu 异常不明显为特征,构成玄武安山玢岩 -闪长玢岩-英安斑岩脉岩组合,与晚阶段的铜铅锌成矿有关。两套脉岩所代表的岩浆-成矿体系在不 同成矿阶段、相同(近)构造部位先后叠加成矿,形成了大井矿床复杂的成矿元素组合。脉岩及其蚀变特 征是该区重要的找矿标志。
中文关键词:脉岩 成矿关系 成矿模式 找矿标志 大井锡多金属矿床
 
The Mineralization and Prospecting Significance of Dykes of Dajing Tin-Polymetallic Deposit,Inner Mongolia
Abstract:Abstract:The Dajing tin-polymetallic deposit, Inner Mongolia, is a hydrothermal vein-type deposit related to volcanic and sub-volcanic rocks. The ore-forming elements are complicated, which have oxyphile (Tin) and chalcophile (Cu, Pb, Zn, Ag) ore-forming elements combination. Dykes in this mining area well development. They can be divided into two categories: felsitic rock and dacite porphyry rock. In the felsitic rock, phenocrysts are not de鄄 veloped, silicified and sericitization strongly, and the features of loss of Eu is significant, all these are have relationship with the tin in early stages; In the dacite porphyry rock, phenocrysts are developed, pyritization strongly, and the features of loss of Eu is not obvious, formed andesitic porphyry-diorite por鄄 phyrite-dacite porphyry veins combination, all these have relationship with Cu, Pb, Zn mineralization. Two sets of dikes represent magma-mineralization system at different stages and the same (near) structural positions has successively superimposed mineralization, which formed the complex ore-forming elements combination in Dajing deposit. Dykes and their alteration characteristic are the important prospecting criteria in this area
keywords:dyke,relationship of mineralization,mineralization model,prospecting criteria,Dajing tin-polymetallic deposit
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