PRIMARY HALO GEOCHEMICAL CHARACTERISTICS AND DEEP METALLOGENIC PROSPECT EVALUATION OF THE HUOGEQI COPPER-POLYMETALLIC DEPOSIT,INNER MONGOLIA

Based on systematic collection of rock and ore samples in 11 drill holes along No.7 and No.9 exploration lines in the Huogeqi copper-polymetallic ore district of Inner Mongolia,the authors drew contour map of primary halos,established vertical element zoning sequence and,in combination with variation characteristics of the indicator elements,made a prediction of concealed ore bodies in the depth.The ore-forming element association of this ore deposit is Cu,Pb and Zn,the front halo is composed of Hg,Sb and Cd,whereas the rear halo comprises W,As and Sn.As this ore deposit lies on the overturned limb of an inverted syncline,the vertical zoning sequence of elements is mainly of reverse zoning,and the variation characteristics of vertical zoning and indicator elements suggest that the ore deposit is characterized by multi-phase and multi-stage repeated superimposition.There exist at least two phases of ore-bearing fluids along No.2 exploration line,and there might exist blind ore bodies in the depth of ZK702,ZK830,ZK726 and ZK817 drill holes.