Abstract: Nibashan area of Qinghai Province is located in the suture belt of Late Paleozoic-Early Mesozoic named Jingyu Lake-A'nyemaqen of the South China plate that lied at the south of Dongkunnan fault.According to the analysis results of the enrichment characteristics of the element such as Sb etc.In Nibashan Area,Qinghai Province,the combination and correlation characteristics of the chemical element in the area are discussed.By the comparison analysis of the Sb element abnormity obtained by 1∶50 000 stream sediment survey and 1∶10 000 soil geochemcial survey,it is show that the reproducibility of Sb element abnormity is perfect,and accompanying the element combination of Au,Cu,Pb,Zn,etc.,the horizontal banding phenomenon of the element combination is appeared significantly,besides that,the element combination is also characterized by stratabound Sb element abnormity.Based on the above geochemical survey results of the area,the engineering verification of Sb element abnormity is done,and one antimony ore-body and one gold ore-body are found,the grade of antimony of the former from 0.48% to 5.97%,with the average grade of antimony is 3.23%,grade of gold of the later is 1.2 g/t.The study results indicated that:①turbidite of Changmahe Formation is the parent rock mass of Au-Sb deposit in the area,the favorable channels of magmatic and hydrothermal are provided by faults,therefore,the distribution of Au-Sb ore-body is controlled strictly by the rock mass and faults;②ideal prospecting results in the area can be obtained by using the integrated prospecting method of 1∶50 000 stream sediment survey,1∶10 000 soil geochemcial survey,geochemical investigation and trenching engineering verification,and antimony ore-bodies might be found in these areas where the Sb content is higher than 20×10-6 by using 1∶10 000 soil geochemical survey method.Based on the above study results,three prospecting target areas (named A,B and C) are delineated,among them,Sb-Au ore-body (ore mineralized body) are found in the A prospecting target area by trending engineering verification,which further indicated the prospecting potential of Au-Sb deposit of the area is good.

Key words: Sb-Au deposit, Sb geochemical characteristics, Stratabound type deposit, Prospecting target area, Prospecting model