新疆富蕴县库马苏南地区地球化学特征及找矿预测

Geochemical Characteristics and Prospecting Prediction of Kumasu South of Fuyun County,Xinjiang

新疆库马苏南地区位于忙代恰铜、金成矿带与正格—乌里土尔根铜、铅、锌、钨多金属成矿带的结合部位。该区区域地质背景复杂,岩浆活动强烈、构造发育,成矿条件十分有利。在结合地质工作成果的基础上,通过1:1万岩石地球化学测量工作,圈定相应的地球化学异常,并解释评价地球化学异常,圈定找矿靶区,以期为下一步工作提供依据。结果显示:区内地球化学异常场形态结构明显,主要呈现为由若干孤岛断续连接而成的北、中、南3条线状异常场。异常主要为Pb、Ag、W、Cu、Au元素异常;圈定出13处综合异常,划分为为甲3-2类异常1处、乙3类异常4处、丙类异常3处、丁类异常5处。其中库马苏6、2、4号异常寻找铅、银矿前景较好,库马苏11、3号异常寻找钨矿前景较好;区内As、Ag、Sb、Pb、Zn、W、Sn、Bi元素含量较高,呈现高背景场特征;而Au、Cu、Mo、Hg元素含量较低,呈现低背景场特征。Au、As、Cu、Ag、W、Pb、Bi元素均方差、变异系数较大,表明该区Au、Cu、W、Pb、Ag元素局部矿化富集特征明显。

South of Jiangsu area of Xinjiang is located at the junction of the copper and gold metallogenic belt.It is in the cross of ZG-Uli tulen copper,lead,zinc and tungsten polymetallic metallogenic belt.The regional geological background is complex,and magmatic activity is strong.Structure is developed and metallogenic conditions are very favorable.On the basis of the results of geological work,this paper delineated the corresponding geochemical anomalies through 1∶10 000 rock geochemical survey.It explained and evaluated geochemical anomalies to delineate the target area for prospecting,in order to provide the basis for the next work.The results are as follows:There are 3 anomalous fields in the north,middle and south of the geochemical anomaly field,which is mainly Pb,Ag,W,Cu and Au.Delineation of 13 integrated anomalies was classified into 1 classes:3-2 in class A,1 in 3,4 in class C,3 in class C,5 in class.Among them,Kumasu 6,2 and 4 are exceptions for prospecting for lead and silver deposits.The prospect of prospecting for tungsten deposits by the anomalies of Ma Su 11 and 3 is better.The content of As,Ag,Sb,Pb,Zn,W,Sn,Bi in the region is high to show a high background field.But the content of Au,Cu,Mo,Hg elements is low,showing low background field characteristics.The mean square deviation and coefficient of variation of elements Au,As,Cu,Ag,W,Pb and Bi were large,indicating that the mineralization and accumulation characteristics of Au,Cu,W,Pb,and Cu elements were obvious in this area.