关键词: 老湾金矿带, 地球化学, 原生晕, 元素组合, 成矿预测, 深部找矿

Abstract: Laowan gold metallogenic belt is the largest single gold deposit in Henan Province,located in the east of QinlingDabei orogenic belt.The element concentration zoning and axial zonality sequence of the primary halo of gold orebody are studied,and the elemental combination characteristics are discussed by correlation analysis,cluster analysis and factor analysis.The results show that the concentration zoning of Au,Bi,Pb,Zn and Mo elements is not closed and extends downward well,indicating that there are still orebodies in the deep.The axial zoning sequence of orebodies is AgMoHgAsWSbZnSnAuCuBiPb,and the hydrothermal elements of high,medium and low temperatures are disordered,indicating that the primary halo is formed by the superposition of multiple orebodies at different times.Au has a good correlation with Bi and Cu,and they migrate and enrich together in oreforming hydrothermal fluids.Bi and Cu can be used as indicator elements for gold prospecting.The main factor F2 (AuBi) represents the geological process that promotes gold enrichment.The spatial distribution of the factor score indicates that the region below -650 m has good potential for prospecting.The target area based on the above prediction has been verified successfully.The above discussion results have certain refernece for the further prospecting work in the mining area.