水系沉积物测量在北山拾金坡地区找矿中的应用

Application of stream sediment survey to ore prospecting in Shijinpo area,Beishan

甘肃北山地区是重要的金、铅、锌、银、铜、铁资源富集区,本文根据拾金坡一带的水系沉积物测量成果,分析了该区域的找矿方向。结果表明:研究区初步圈定综合异常11处,根据异常组合特征等分为两大类,一是与中酸性岩浆岩有关的综合异常,多分布在近东西向和北东向断层的交汇部位,是寻找热液型金、铅、锌、银的有利部位;二是与地层有关的综合异常,其空间分布与蓟县系平头山组(Jx)和古元古界—新太古界敦煌群(Ar_(3)Pt_(1)D)具有明显的空间耦合关系,是寻找喷流沉积型铅锌银矿是构造蚀变岩型金矿床的有利部位。

Beishan area of Gansu Province is an important rich area of gold,lead,zinc,silver,copper and iron resources.Based on the results of stream sediment survey in Shijinpo area,this paper analyzes the prospecting direction of this area.The results show that 11 comprehensive anomalies have been identified in the study area,which can be divided into two categories according to the characteristics of abnormal assemblages.The first is the comprehensive anomalies related to intermediate and acidic magmatic rocks,which are mostly distributed at the intersection of near EW and NE trending faults,which are favorable sites for searching for hydrothermal Au,Pb,Zn and Ag.The second is the comprehensive anomaly related to strata.Its spatial distribution has obvious spatial coupling relationship with the Pingtoushan Formation(Jx)of Jixian System and the Paleoproterozoic--Neoarchean Dunhuang Group(Ar_(3)Pt_(1)D),which is a favorable position to find the jet sedimentation type Pb-zn-Ag deposit and the tectonic altered rock type gold deposit.