柴达木山南坡金铜矿土壤地球化学研究与找矿

Soil Geochemistry and Prospecting of Gold and Copper Deposits in the Southern Slope of the Qaidam Basin

对柴达木山南坡一带进行了1∶1万地质草测,在了解研究区地质特征的基础上开展了1∶1万土壤地球化学测量工作。对6种测试元素的结果进行分析,采用分形含量面积法和分形含量梯度法圈定地球化学元素含量异常,采用因子分析研究元素组合特征,并圈定了组合异常和综合异常。结果显示,Au、As、Sb的含量分布颇有相似,高含量区主要集中于二叠系地层,Au和As相对套合较好;Cu、Pb、Zn的含量分布既有共性也存在不同,Cu和Zn套合较好,其高含量区主要集中于志留系地层。最后以探槽工程验证方式对异常进行了查证,圈定了一处找金靶区和一处找铜靶区,为该区今后的找矿工作提供有利的依据。

An 1：10000 geological survey is conducted in the southern slope of Qaidam basin, followed by an 1：10000 soil geochemical measurement on the basis of understanding its geological characteristics. Six kinds of test elements are analyzed, and geochemical anomalies of element content are delineated by using the fractal content-area method. Characteristics of element combination are analyzed using the factor analysis method, and combination and integrated anomalies are finally determined. The results show that the distribution of An, As and Sb is quite similar, and areas with high content values are mainly concentrated in the Permian strata. The elements of Au and As relatively set better. The distribution of Cu, Pb and Zn exhibits both com- monness and differences. The elements of Cu and Zn relatively set better, for which the areas with high content values are mainly concentrated in the Silu- rian strata. We validated the anomalies using the exploratory trench engineering, and delineated a target area for gold and a target area for copper. It can provide beneficial basis for the future prospecting work in this region.