陕南何家垭地区土壤地球化学特征及找矿预测

陕南何家垭地区（研究区）地处勉略宁三角区，是铜、镍、铁、金、猛、锌等多金属矿重要的富集区，具备良好的成矿潜力。为明确研究区找矿方向，缩小找矿靶区，在区内对Ti、V、Mn、Zn、Cu、Pb、 Ni、Au、As 9种元素开展了1∶10 000土壤地球化学测量。针对土壤地球化学测量的元素含量，进行了相关参数（平均值、变异系数、富集系数）统计并结合单元素异常分布特征进行了分析，结果表明，Ti、V、Mn、 Cu、Ni、Au、As 、Zn成矿潜力较大， Pb成矿潜力较小。根据元素组合衬度异常分布特征、研究区成矿地质背景、成矿地质条件，在区内共圈定2处找矿靶区，A靶区一处与B靶区一处。A靶区中Cu、Ni、Au、As、Mn、 Zn异常强度分别为137.1×10-6、91.7×10-6、2.45×10-9、39.8×10-6、1 512×10-6、128×10-6；B靶区中Ti、V异常强度分别为9 810×10-6、259×10-6。综合单元素异常分布特征、元素组合衬度异常分布特征、 研究区成矿地质背景、成矿地质条件与物探信息对找矿靶区进行了成矿潜力分析，认为A靶区具有寻找岩浆熔离型铜镍等多金属硫化物矿的潜力，B靶区具有寻找热液蚀变型钛磁铁矿的潜力。

Soil Geochemical Characteristics and Prospecting Prediction in Hejiaya Area of Southern Shaanxi

Hejiaya area (study area) in Southern Shaanxi is located in Mianluening triangle area，which is an important enrichment area of copper， nickel， iron， gold， manganese， zinc and other polymetallic deposits， and has good metallogenic potential. In order to clarify the prospecting direction and narrow the prospecting target area of the study area， 1∶10 000 soil geochemical surveys were carried out for Ti， V， Mn， Zn， Cu， Pb， Ni， Au and As 9 elements in the study area. Based on the statistics of the relevant parameters (average value， variation coefficient， enrichment coefficient) of the element content measured by soil geochemistry， and combined with the distribution characteristics of single element anomaly， the results show that the metallogenic potential of Ti， V， Mn， Cu， Ni， Au， As and Zn is larger than that of Pb. According to the distribution characteristics of element assemblage contrast anomaly， metallogenic geological background and metallogenic geological conditions， two prospecting targets areas are delineated in the study area. The abnormal intensity of Cu， Ni， Au， As，Mn and Zn in A prospecting target area is 137.1×10-6， 91.7×10-6， 2.45×10-9， 39.8×10-6 ， 1 512×10-6 and 128×10-6 respectively， the abnormal intensity of Ti and V in B prospecting target area is 9 810×10-6 and 259×10-6， respectively. The metallogenic potential of the prospecting target areas is analyzed by means of single element anomaly distribution characteristics，element combination contrast anomaly distribution characteristics，metallogenic geological background， metallogenic geological conditions and geophysical prospecting information. It is considered that the A prospecting target has the potential to search for magmatic molten copper-nickel and other polymetallic sulphide deposits， and the B prospecting target has the potential to search for hydrothermal altered ilmenite.