黑龙江椭坡垴地区水系沉积物地球化学特征与找矿前景

Geochemical characteristics and prospecting prospects of stream sediments in the Tuoponao area,Heilongjiang

椭坡垴地区为大兴安岭森林植被浅覆盖区,是实施水系沉积物测量找矿的有利区域,针对该区热液成矿作用的特点,对该区开展了Au、Ag、Cu、Pb、Zn、As、Sb、Bi、W、Mo、Sn、Hg等12种元素的1∶5万水系沉积物测量,通过对4个地质子区的元素地球化学特征进行的对比与分析,查明了区域元素富集贫化规律,采用因子分析方法对特征值大于1的塔木兰沟组火山岩(J_(3)t)子区和侵入岩(ηγ∈3-O_(1)和γπ∈3-O_(1))子区的因子主成分进行了系统研究,结果表明火山岩子区中宝14Hs-30异常由金铅锌矿化引起,在该子区发现金铅锌矿点一处;侵入岩子区中宝14Hs-4异常由锡矿化引起。在此基础上总结了区内金矿和铅锌矿的找矿标志,并在该区域内圈定锡成矿远景区1处。

Twelve elements such as Au,Ag,Cu,Pb,Zn,As,Sb,Bi,W,Mo,Sn,Hg are analyzed for 2776 sedimentary samples of 1:50000 stream system in Tuoponao area of 630.29 km 2.The geochemical characteristics of the four geoproton areas are compared and analyzed,and the rrgularity of regional element enrichment and depletion is found out.The factor analysis method is adopted to systematically study the factor principal components of sub-area(J_(3)t)of volcanic rock and intrusive rock(ηγ∈3 O_(1),γπ∈3 O_(1))of Tamulangou Formation with characteristic values greater than 1.The study result indicates that the Bao14Hs-30 anomaly in the volcanic rock sub-area is caused by gold-lead-zinc mineralization,and a gold lead zinc mineral spot has been discovered in this sub-area.The Bao-14Hs-4 anomaly in the intrusive rock zone is caused by tin mineralization.On this basis,the prospecting indicator for gold and lead-zinc mineralization in the region is summarized,and one tin mineralization prospect area is delineated within the region.