西藏哲古-雪莎一带锑金等多元素地球化学特征及靶区优选OA

The Tibetan Tethyan Himalayan Tectonic Belt boasts superior metallogenic geological conditions and stands as a significant Sb-Au enrichment belt in China.To facilitate prospecting breakthroughs for Au,Sb and other asso-ciated minerals in southern Xizang,this study focuses on the Zhegu-Xuesha area in the eastern segment of this tectonic belt.Based on large-scale geochemical exploration data,analyses of elemental geochemical parameters and element association characteristics were conducted.The subarea-multi background method was employed to determine the anomaly threshold,and regional prospecting prediction was performed with geochemical anomaly characteristics as the core basis.The results indicate that Au,As,Sb,Pb,Zn,and Ag are the primary ore-forming elements or associated elements in the study area.These elements constitute three independent and partially inter-related metallogenic systems,namely the Au-As metallogenic system,Sb-Ag metallogenic system,and Pb-Zn-Ag polymetallic metallogenic system.The subarea-multi background method effectively enhances the prediction ac-curacy.Based on the elemental geochemical anomaly characteristics,4 high prospective areas were delineated in the region,which were further refined into 5 Class A target areas,3 Class B target areas,and 5 Class C target ar-eas.Additionally,4 key prospecting targets were selected for in-depth anomaly analysis.The research findings provide a reliable scientific basis for regional mineral prospecting and exploration program planning searching for Sb,Au,and other polymetallic deposits in the study area.