藏南康马县布主金(锑)矿土壤地球化学异常信息提取及成矿预测

康马地区处于特提斯喜马拉雅构造域东段,是青藏高原具特色和重要的金(锑)成矿带.布主金(锑)矿处于EW向断裂与SN向断裂交会部位的康马地区,成矿地质条件良好.为解决布主地区的找矿问题,本文以藏南康马县布主金(锑)矿1:1万土壤地球化学测量为研究对象,运用元素的变化系数及富集离散特征对研究区土壤地球化学测量的8种微量元素进...

Soil Geochemical Anomaly Information Extraction and Metallogenic Prediction of the Buzhu Gold(Antimony) Deposit in the Kangma County,South Tibet

Kangma area is located in the eastern part of the Tethys Himalayan tectonic domain，and it is a characteristic and important gold（antimony） metallogenic belt in the Qinghai-Tibet Plateau.Buzhu gold（antimony） deposit is located in the Kangma area where the EW trending fault and SN trending fault intersect，and the metallogenic geological conditions are good.In this paper，1∶10 000 soil geochemical survey of Buzhu gold（antimony） deposit in Kangma County，southern Tibet was studied.Eight trace elements from soil geochemical survey in the study area were analyzed statistically by using the coefficient of change of elements and the discrete characteristics of element enrichment.By discussing the metallogenic potential of eight trace elements and combining with the characteristics of Au，Ag，As，Sb and Pb with high coefficient of variation，large degree of dispersion and many mineralization in the study area，it is considered that Au is the main metallogenic element in the study area，and Ag，As，Sb and Pb can be used as important indicator elements to search for gold deposits in this area.Cluster analysis，correlation analysis and factor analysis were used to study the rule of element association.Three groups of element association were divided.The first group was the element association of Au，Ag，As and Sb，the second was the element association of Pb and Zn，and the third was the element association of Hg and Cu.Among them，the first group of Au，Ag，As，Sb element assemblage is the main ore-forming element assemblage in the study area，Au is the most important ore-forming element in the study area，Ag，As，Sb element is an important indicator element to search for gold deposits in the area，which has a good ore-prospecting prospect.The method of mean ±3 times standard deviation was used to study the geochemical anomalies and determine the lower limit of the anomalies.Combined with the contrast anomaly delineation method，seven major element comprehensive anomalies （HS-1~HS-7） with good correlation with gold elements were delineated.Combined with the regional metallogenic geological background and the geological-geochemical characteristics of the study area，two favorable prospecting target areas are delineated.The geochemical anomalies in the two target areas are significant，with prominent concentration centers and good combination of anomalies，which have great prospecting potential.Through the field geological survey，it was found that limonite fossil quartz vein was found in target area 1，and local intense limonitization occurred，which is a key ore prospecting area for the next step.