| The geotectonic position of the WuYun basin in the northern part of the Xiao Hinggan Mountains is located in the eastern part of the Central Asia-Xingmeng orogenic belt.and the splice active belt of the two blocks of the Songliao block and Jiamusi.After many tectonic evolution and intense magmatic activity,favorable metallogenic geological conditions have been formed.The dissertation selects the area of WuYun basin in the north of the Xiao Hinggan Mountains,By studying the geological conditions of strata,tectonics and magmatic rocks in this area,the geological features of geophysical,geochemical and remote sensing images,the geological characteristics of the Gaosongshan gold ore deposit in the region are dissected,comprehensive comparative study is carried out and the ore deposit model of the study area is established,and the prospecting criteria and metallogenic regularity of this area are summarized,and the exploration area is constructed.The ore model points out the direction for gold prospecting in the next stage.The strata closely related to mineralization in the WuYun basin are mainly Mesozoic Early Cretaceous Guanghua group and Banzifang group.The lithology is mainly rhyolite and pyroclastic rocks.The study area is generally controlled by the North East and North West trending faults and their secondary faults.The intrusive rocks are mainly the late Yanshan alkali feldspar granite,which are the main ore hosting rocks in this area.By collecting the data of previous gravity and aeromagnetic results,combined with the 1:10000 high precision magnetic measurement and electrical measurement carried out at the Liuzhi trench,and the 1:10000 soil measurements carried out at the Meifeng forest farm,the characteristics of the geophysical,geochemical and remote sensing information signs of the Wu Yun basin are summarized.In the verification area of Meifeng forest farm,6high precision magnetic anomalies were delineated,2 of the amplitude and frequency of induced polarization were abnormal,and no gold bearing geological bodies were discovered by trenching.206 soil anomalies were delineated in the Liuzhi trench identification areas,including abnormal Au 9,Ag anomaly 23,Cu abnormality 35,As anomaly 42,Sb anomaly 40,Bi anomaly 29 and Hg anomaly 28,the combination anomaly6,providing 6 target area for prospecting targets.In the Ht05 combined anomalous rhyolitic melting breccia tuff,the trench revealed a gold deposit of 1.8m wide,with a single engineering control and a maximum grade of 1.1×10-6.Through the anatomy of the gold mineralization characteristics of the Gaosongshan gold deposit in the Wu Yun basin and the comparison of the characteristics of the Dongan gold deposit,the ore deposit model of the epithermal gold deposit in the Wu Yun basin is established.On the basis of comprehensive analysis of metallogenic geological environment and ore control geological conditions,the geological prospecting model,geophysical prospecting model,geochemical prospecting model,remote sensing information prospecting model and ore prospecting markers are summarized,and the edge uplift zone,key ore bearing strata and rock mass,ore conducting and ore bearing structure,remote sensing interpretation of favorable ore-forming areas,lconic wall rock alteration,geophysical and geochemical anomalies in the WuYun basin are pointed out. |
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