| The Small Qinling Mountains(SQM)gold belt,the southwest margin of the North China Craton(NCC),is located in the western part of Henan province and the eastern part of Shaanxi province.The SQM gold belt can be divided into three major gold ore fields: Xiaoshan gold ore field,Xiong Er Shan gold ore field,and Small Qinling gold ore field,which is the largest gold ore field in SQM gold belt.The Tongyu gold deposit is one of deposits in the Small Qinling gold ore field.In order to strengthen the prediction and exploration of mine's subsequent resources,the research of the structural superimposed halo of Tongyu gold deposit was carried out on the basis of geochemical background and geological characteristics of the deposit.The characteristics of the axial zoning and superimposed mineralization halo of main ore body in the Tongyu gold deposit were studied,and also structural superimposed halo model for Tongyu gold deposit were established.Prospecting targets of blind ore body in the deep part of Tongyu gold deposit were delimitated using this model.The main results are as follows:A total of 847 structural superimposed halo samples from 5 different veins were collected.18 elements of the 847 samples(Au,Ag,Sn,B,Co,Cu,Mn,Ni,Pb,Ti,V,Sn,As,Sb,Bi,Hg,W,Mo)were tested,the geometric mean value and the contrast value of 20 background samples' s tested data were calculated.According to the above,the geochemical background of the indicator elements are obtained,the standard of the structural superimposed halo anomaly is determined.On the basis of a large amount of tested data and calculated data,the combination of characteristic elements of each vein was obtained: Q28-1:Au,Ag,Cu,Pb,Zn,As,Sb,Hg,Bi,W;Q61:Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Co,Ni,W,Sn;Q8501-3:Au,Ag,Cu,Pb,As,Bi,Mo,Co,W;Q640-2:Au,Ag,Cu,Pb,Zn,As,Sb,Bi,Mo,Co,Ni,W,Sn;Q640-3:Au,Ag,Cu,Pb,As,Bi,Mo,Co,W,And the correlation of elements in different minralization stages was obtained.The ichnography and vertical projection drawings of structural supermposed halo have been made.The results show that there are several enrichment centers of Au in gold ore bodies in each vein.The head lalo element is composed of As?Sb?Hg?B;The near-ore halo element is composed of Au?Ag?Cu?Pb?Zn,and the strong anomaly of Pb,Zn,Cu reflects the superposition of the halo formation in the third stage;The tailing halo element is composed of Bi?Mo?(Mn)?Co?Ni.The primary halo axial zonation sequence of single mineralization from top to bottom is:Hg?As?Sb?B?Ag?Au?Pb?Zn?Cu?Mn?Bi?Mo?Co?Ni.The ideal pattern of structural superimposed halo in Tongyu gold deposit is established,and the prediction criteria of structural superimposed halo blind ore are determined.The prospecting targets of eight blind ore and one favorable ore-forming location have been proposed.To assess the prospective resources of prospecting targets,total resource of ore are 1195300 tons and the gold resource are 6.67 tons.We have get ore in two prospecting targets of blind ore body. |
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