The Research Of The Metallogeny And Mineralization Of The Hadamengou Gold Deposit,Inner Mongolia

Hadamengou gold deposit located in one of the most important gold metallogenic belt of northern margin of north China craton west-middle section,the central China's Inner Mongolia autonomous region,the overall regional metallogenic conditions is very superior.This paper based on the extensive summarizes the former research about hadamengou gold deposit of literature as well as work in recent years of exploration and mining materials,on the basis of through the detailed field investigation,sampling and testing of the indoor work,through the geology,chronology,geochemistry and mineral deposits such as comprehensive study,having the further understanding of making clear about the ore-forming geological characteristics,ore-controlling factors of Hadamengou gold deposit and source of ore-forming materials and some others.Summarizes the connection between the magmatic rocks in the area and ore deposit,regularity of mineralization and metallogenesis.To provide forecast for the next step of prospecting work in the region and the direction.Orebody mainly occurs in the ural mountain group of metamorphic rock of archean,It's Spatial orientation mainly effected by the magmatic rocks,fault and fold factors,especially the fracture control effect is more obvious.The ore type of deposit mainly contains three types :Including-gold quartz veins,quartz potash feldspar veins and potassium silicide of altered rock.Wall rock alteration mostly development in the mining areas with potassium,silicification,sericitization and pyritization and so on.Mineralization mainly can be divided to four stages:the process of potassium feldspar-quartz,quartz-pyrite-sericite-chlorite,quartz-gold polymetallic sulphide and carbonate.According to the S isotopic composition,the source of S which in the mineralization is mainly mixing the S of strata and deep fluid.The result of Pb isotope reflects the diversity of the minerals.The results of the hydrogen-oxygen isotope shows that the mineralization hydrothermal is mainly derived from the magma water and the partially metamorphic liquid,by mean time mixed some atmospheric precipitation.The density of the fluid inclusion was 0.87 g/cm3.The salt is 11.98 wt % nacl.eq.Uniform temperature averages 271 ?.And characteristics of trace elements combination which in pyrite sample electron probe results show that the deposit may be formed in the-in low temperature environment,the composition of ore-forming fluid is more complicated.The diagenetic age of Dahuabei and Shadegai rock mass respectively 338±10Ma,223±3Ma.The gold mineralization of Hadamen gold deposit is middle hercynian to indosinian early time,this period of magmatic activity of its mineral activation transfer and concentration have direct positive significance,but also reflects the orebody and magmatic rocks have very close connection.Considering about the complex mining,metallogenic background and conditions,and the depth of gold vein formation,it's shows that Hadamengou gold deposit is characterized by multi-stage metallogenic deposits.During the middle hercynian ore-forming materials began to gradually preliminary enrichment,the indosinian period magmatic activity widely and strongly,entered the stage of large-scale mineralization.At the later yanshan period take a step further superposition and suffered the part of the epigenetic transformation.