| Paper Qin Lingshan ba ditch area west of yanchang formation as the main research object,based on the regional geological survey in the village-narikawa town in gansu province "project,through field geological survey and indoor data processing,find out the deer dam typical gold metallogenic geological background,ore deposit geological feature,summarizes its ore-controlling factors and prospecting marks,prospecting model is set up,etc.Comprehensive study of the study area,the resource potential evaluation and delineated the smallest prediction area,estimated gold reserves.In the following:1,The study area is located in the south of cooperation-min county-down chang regional fracture,the outdoor main layers of quaternary system,new system of gansu group of yanchang formation,cretaceous Zhou Guwan group,big river dike and light cover mountain group,predecessors thought formation in lung for river group,and the work will be the mountains fold system collapse the light cover group,the big river dike group.Through the areas exposed stratigraphic unit of the basic sequence characteristics,sedimentary environment and sedimentary facies in the studied area of research,identify the alluvial fan facies,meandering river facies,slope gully-equal slope fan main sedimentary facies.According to the lithology combination and the sedimentary environment,will be divided the study area building sandstone and siltstone-SLATE building-powder sandstone,lithic feldspar sandstone,SLATE building such main sedimentary formation.2,good stream sediment area average value of each element and the west qinling region in gansu province in comparison with the average of stream sediments,stream sediment in Au,Sb,As,Hg and other elements are enrichment(Kk > 1),the rest of the elements in different degree of enrichment.And with strong epigenetic superposition.Clustering analysis,according to a study in low temperature hydrothermal element combination,Au and Sb are closely related,reflecting,Au,Ag,W Sb,As elements enrichment mainly related to low temperature hydrothermal ore-forming activities;Relative metallogenic prediction by applying the method of valuation each element within the areas,the results show that Au,Sb,Hg,As is the main ore-forming elements.3,deer dam typical gold orebody output by nearly east-west and north west to the fractured zone;In acidic vein rocks(diorite Bin dike)and Triassic in light cover mountain group of coarse clastic rocks to build control.Although acidic magma intrusion activities in area is not strong,but closely related to formation and tectonic hydrothermal ore deposit,ore-forming elements in low temperature Au,Hg,As,Sb,Ag,etc.Belong to hydrothermal alteration and variant deposit.According to the regional geology and sulfur isotope data analysis,the ore-forming material mainly come from yanchang formation and its deep sediments(silurian system,devonian system),magma may also provide some ore-forming materials;Fluid is mainly formation water,mixed with some magmatic water and atmospheric precipitation.Heat source mainly comes from geothermal heating,hot magma and tectonic thermal source formed by the superposition of regional thermal field.Driven by static stress,tectonic stress and magmatic thermal power and other composite power.Metallogenic temperature of low temperature.To sum up,for low temperature hydrothermal gold deer dam broken alteration rock gold mine.4 variant gold mine,on the basis of the study area and broken erosion prediction elements,in the favorable metallogenic delineated the smallest prediction area,volume method is used to estimate the gold resources in this area,we estimate the results of 500 meters to shallow gold reserves(334-1)11632.35 Kg,906.4 Kg(334-2),(334-3)2415.2 Kg,predicting resources 14953.95 Kg(more than 334);1000 meters with shallow gold reserves(334-1)23264.7 Kg,1812.8 Kg(334-2),(334-3)4830.4 Kg,predicting resources29907.9 Kg(more than 334);2000 meters with shallow gold reserves(334-1)46529.4 Kg,3625.6 Kg(334-2),(334-3)9660.8 Kg,predicting resources(above 334)59815.8 Kg. |
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