甘肃花牛山喷流沉积型金银铅锌矿床控矿因素与找矿前景分析  

Metallotectonics and Prospection of the Huaniushan Exhalogene Gold-Silver-Lead-Zinc Deposit in Beishan,Gansu Province

作　　者：杨建国[1] 翟金元 杨宏武 王小红[1] 谢春林[1] 王兴安[1] 任秉琛[1] 

机构地区：[1]西安地质矿产研究所,陕西西安710054 [2]甘肃西脉矿冶公司,甘肃瓜州736100

出　　处：《大地构造与成矿学》2010年第2期246-254,共9页Geotectonica et Metallogenia

基　　金：全国危机矿山接替资源找矿专项"甘肃省安西县花牛山金银铅锌矿矿产预测"项目(200662062)资助

摘　　要：花牛山银铅锌矿床过去大多研究者认为其形成与印支期花岗岩有关。但矿床地质特征、矿化类型及成矿年代学研究表明,花牛山银铅锌矿床是中元古代晚期古火山喷流沉积作用的产物。本文在分析论述矿区喷流沉积型贵重-有色金属系列矿化成矿作用特点和成矿规律的基础上,系统归纳总结了矿床主要控矿因素与找矿标志。并按照层控找矿思路,结合地质及物探工作资料,指出了今后开展接替资源勘查的找矿靶区。Metallogenic regularity and ore-controlling factors are the key to prospecting breakthrough in the depth for some crisis mines. Most of the previous researchers considered the formation of the Huaniushan silver-lead-zinc polymetallic deposit was related to Indosinian granites. However,we suggest the deposit was formed by submarine exhalation-sedimentation in Late Mesoproterozoic according to its geological characteristics,mineralization types and metallogenic geochronology. The mineralization is controlled by paleo-volcano and sedimentary lowland in the synsedimentary period. The industry orebodies mainly occur near the contact belt,which were formed between the epimetamorphic clastic rocks of the second lithological section of the Pingtoushan Group and carbonate rocks or basalts of the third lithological section. The mineralization has a zoning distribution. The stratiform Fe-Cu mineralization occurs in the basalts with carbon-silicious slates,stratiform Ag-Pb-Zn （Cu） mineralization in the carbon-phyllite with crystal limestone or tuff layers and vein or stratiform Ag-Pb-Zn rich ores in the synclase round the volcanic craters. However,in the sedimentary lowlands far from the volcanic craters,stratiform Ag-Pb-Zn mineralization or gold-silver-bearing pyritized ores were formed. On the basis of mineralization characteristics and metallogenic regularity of the Huaniushan polymetallic deposits,we made a summary on the major ore-controlling factors and prospecting indicators,and pointed out the prospecting target according to layer prospecting （strata-bound） and geology and geophysical surveys.

关 键 词：金银铅锌矿 喷流沉积 成矿系列 控矿因素 找矿潜力 甘肃花牛山 

分 类 号：P612[天文地球—矿床学]