Primary halo characteristics of the north ore zone in the Huachanggou gold deposit,Lueyang County,Shaanxi Province

The Huachanggou gold deposit of Shaanxi Province occurs in the submarine basic volcanic effusive spillite.Based on field geological work in the Huachanggou gold deposit,this paper analyzes trace elements of the samples in the north ore zone by such means as geo-mathematic analysis and calculation of the primary halo zoning.The result shows that the front halo elements are Sb,As,Cu,Hg,the near-ore halo elements are Au,Ag,Bi,Pb,W,and the rear halo elements are Ni,Co,Mn,Mo,Zn,Cd.The primary halo axial zoning sequence from the top to the deep part of the north ore zone is Hg-Bi-Mo-Au-Ag-As-Cu-Pb-Co-W-Mn-Sb-Ni-Zn-Cd.According to the characteristics of threshold halo zoning,the ideal zoning model of the primary superimposed halos is built.Three ore bodies(A,B and C) appear in the area form the 950m level down to the 830m level.The tail of ore body A is stacked on the top of ore body B,while ore body C is far away from ore body B.The tail of the ore body C appears at the 830m level,and the its downward extension is not large.