内蒙古阿拉善右旗拜兴图地区土壤地球化学异常特征及找矿预测OACSTPCD

In order to preferably select the prospecting prediction target area in Baixingtu area of Alxa Right Ban-ner,1∶10 000 soil geochemical measurements were carried out on the basis of identifying the geological conditions of mineralization in the area.Elemental variation coefficients,ILR transform and ILR-PCA multivariate statistical analyses were used to analyze the seven elements:Au,Ag,Co,Cu,Pb,Zn and As in the study area.The results show that:(1)ore-forming elements mainly occure at the intersection of the fracture and mineralized alteration zone.Au and Ag show very strong differentiation and enrichment characteristics with the highest mineralization po-tential,while Pb,Zn,As,Co and Cu show low differentiation and enrichment characteristics,and low minerali-zation potential.(2)ILR transformation eliminates the closure effect of the original data and makes the elements show standard normal distribution;the first principal component of ILR-PCA can extract the comprehensive infor-mation of the elements of the original data to the maximum extent,i.e.,the positive end-load of PC1(Au-Ag-As)is the mineralization indicator,and the intensity and morphology of elemental anomalies are controlled by the fracture and mineralization alteration zone,and the negative end-load(Co-Cu-Pb-Zn)is caused by the enrich-ment of elements in multi-phase magmatic hydrothermal activity.(3)Engineering verification of the mineralization target area No.Ⅰ has identified several gold(silver)ore(mineralization)bodies,and the gold and silver contents have reached the minimum industrial grade or above,indicating that the Baxingtu area has a large potential for gold and silver prospecting.