勉县—略阳—宁强矿集区找矿模型与找矿预测

Prospecting predictionand prospecting model of Mianxian-Lueyang-Ningqiang ore-district

勉县—略阳—宁强矿集区(勉略宁矿集区)构造、岩浆活动强烈,矿种及矿化类型多样,成矿条件优越,已建成各类矿山上百处,是陕西省重要的金属矿产基地。然而,这些矿山多建于20世纪中后期,目前多已面临资源枯竭。自21世纪初以来,勉略宁矿集区虽实施了多项矿产勘查项目,但找矿成果均不理想。笔者依托近10余年来承担的科研项目和各类找矿项目,通过对矿集区典型矿床的深入研究,详细总结了矿集区成矿规律、控矿因素、找矿标志等;在此基础上划分了4个成矿系统、10个矿床成矿系列及11个矿床成因类型,建立了矿集区综合成矿模式及“三位一体”找矿模型;建立了区内“地质研究+物化探+钻探验证”的一套有效找矿方法技术组合;通过综合研究开展了深部找矿预测,圈定了10个找矿远景区和16个找矿靶区,依据研究成果及所圈定的找矿靶区,实施找矿工程验证,探获新增金资源量1368 t、铁资源量586万t、铜资源量6.75万t、铅锌资源量10.89万t、锰资源量649.42万t,新增资源量有效延长了矿山服务年限,资源量潜在价值39亿元,实现了矿集区重大找矿突破,研究成果具有重要的理论与现实意义。

Mianxian-Lueyang-Ningqiangore-district is characterized by intense tectonic and magmatic activi⁃ties.The ore types and mineralization types are various,and the metallogenic conditions are superior.Mian-Lue-Ning ore-district has built over hundredsmines of various types,and is an important base of metal mineral resources in Shaanxi Province.Most of these mines were built in the middle-late period of last century,and now they are fac⁃ing resource depletion.Since the beginning of this century,many mineral exploration projects have been carried out in Mian-Lue-Ning orefield,but the prospecting results are not unsatisfactory.Based on the scientific research projects and various prospecting projects undertaken in the past 10 years,the authors have summarized the metal⁃logenic regularity,ore-controlling factors,prospecting criteria,and so on in detail via the study of typical deposits in the ore-district.Base on the above,the authors have classified 4 metallogenic systems,10 metallogenic series and 12 metallogenic types,established the integrated metallogenic model and Trinity prospecting model in oredistrict,established a set of effective prospecting method and technique combination about geological research,geophysical and geochemical exploration,and drilling verification in ore-district.The authors carried out the deep prospecting predictionby comprehensive study,delineated 10 prospecting prospects and 16 prospecting targets.Based on the research results,the ore prospecting project was carried out to verify the delineated prospecting targets,the newly discovered amount of gold,copper and other new resources effectively extended the service life of the mines,and the potential value of the resources was 3.9 billion yuan,which has achieved a major breakthrough in ore-district.The research results are of great theoretical and practical significance.