内蒙古额济纳旗微波山地区土壤地球化学特征 及找矿潜力

Soil Geochemical Characteristics and Metallogenic Potential in Weibo Mountain Area of Ejina Banner,Inner Mongolia

地球化学勘查是发现远景区、缩小靶区最快捷的找矿方法之一。以1∶5万土壤地球化学测量成果为依据,研究了内蒙古额济纳旗微波山地区18种元素地球化学特征,总结了元素分布规律,发现本区Rb、Nb、W、Mo、Bi、Au、Cu等元素异常显著,由此圈定综合异常10处,并对主要异常进行成矿潜力评价,综合分析认为AP5乙2异常具寻找金多金属矿的地质-地球化学条件,AP6乙1异常具寻找大型铷铌钽矿的潜力,AP8乙2异常具寻找钨钼稀土矿的潜力,异常查证在AP5异常内发现了金矿(化)体,AP6与AP8异常内发现了稀有稀土矿(化)体。其中花岗伟晶岩型铌钽铷与高温热液型钼-稀土矿化类型的发现是内蒙古北山地区的首例,为内蒙古地区找矿思路的转变提供依据。

Geochemical exploration is one of the quickest prospecting methods to discover prospective area and reduce the target area.Based on the 1∶50,000 soil geochemical survey,this paper studies the geochemical characteristics of 18 elements in Weibo mountain area,summarizes the distribution law of 18 elements.It is found that the anomalies of Rb,Nb,W,Mo,Bi,Au,Cu in the area are significant.Ten comprehensive ano-malies are delineated and the metallogenic potential of the main comprehensive anomalies is evaluated.It can be found that AP5(B2)comprehensive anomaly has geological-geochemical conditions for gold polymetallic deposit,AP6(B1)comprehensive anomaly has potential for large-scale Rb-Nb-Ta mineralization and AP8(B2)comprehensive anomaly has W-Mo-REE mineralization.For the anomaly verification,the gold ore(mineralization)bodies were found in AP5,and rare and rare earth elements ore(mineralization)bodies have been found in AP6 and AP8,which have great metallogenic potential.Among them,the discovery of granite pegmatite Nb-Ta-Rb and high temperature hydrothermal Mo-REE mineralization types is the first case in Beishan metallogenic belt,Inner Mongolia.Meanwhile,it also provides the basis for the change of prospecting ideas in this area.