The Geochemical Anomaly Evalution And Metallogenic Model At Ganyugou Area In Tangchang Gansu Province

The Qinling Orogenic belt is famous for its noble metals,non-ferrous and ferrous metals,many researchers focused on minerals products in this belt.Ganyugou is located in the southern zone of the Western Qinling orogenic belt,which is mainly developed iron ore,gold mine,lead-zinc ore.However,the gene and reverse is not clear in study area.The stratigraphic division of the study area belongs to Qinqikun stratigraphic region,Qinling stratigraphic region and South Qinling stratigraphic region.The main strata exposed in the region are Silurian Bailongjiang Group,Devonian Xihanshui Group Gudaoling Formation,Devonian Tieshan Formation and Lower Carboniferous Series.The tectonic framework of this area is controlled by Lintan-Michang-Liangdang deep fault and Maqu-Diebu-Wudu fault.The faults in this area are mainly interlayer faults in the wing of anticline,striking northwest and occurring in the same direction as strata.Based on the previous research work,such as the basic geological,geophysical,geochemical and testing data,the geochemical anomaly evalution of the study area is committed and several conclusions were presented:(1)The characteristics of strata,structure,magmatic rocks and mineralization alteration in the mining area are investigated.By 1:50,000 stream sediment survey,7 anomalous areas of Au,2 anomalous areas of Cu,2 anomalous areas of Pb,3 anomalous areas of Zn,1 anomalous areas of As,1 anomalous areas of Hg and 3 anomalous areas of Ag were delineated.(2)The 1:25,000 geochemical surveys of gully sediments was employed,based on the 1:50,000 stream sediment survey,to verify the delineated Au anomaly(anomaly-1,anomaly-2,anomaly-3),7 anomalous areas of Au,3 anomalous areas of Cu,2 anomalous areas of Pb,2 anomalous areas of Zn and 4 anomalous areas of Ag were re-delineated.(3)6 anomalous areas of Cu and 9 anomalous areas of Zn were delineated by 1:10,000 soil profile survey,which were integrated into two integrating anomaly,hs-1 and hs-2,and finally narrowed the prospecting target area.1 Au orebody,1 Cu,Zn and Fe polymetallic ore(mineralized)body and 1 zinc mineralized point were indicated by surface trench prospecting engineering.Through the study of orebody characteristics,ore characteristics and ore types,it is found that the Shuitanzi mining section is mainly gold orebody.Shalengan ore section is mainly composed of copper,zinc and iron polymetallic ore bodies,which proves that the deposit is essentially a combination of hot water leaching type deposit and porphyry type deposit.The indosinian-yanshanian granitoids are relatively developed and closely related to mineralization.