| The Jinchangyu Gold Deposit is located on the northern edge of the North China Landmass and is one of the largest gold deposits in China.Over the years,the geological work of Jinchangyu Gold Mine has achieved fruitful results,but the research on the characteristics of ore-controlling structures in the area is relatively weak.On the basis of summarizing the previous achievements,this paper,through field investigations and analysis of geological characteristics of the deposit,to study the characteristics of the ore-controlling structure of the Jinchangyu gold deposit can strengthen the correct understanding of the structural deformation features of the area and help Clearly understand the impact of the ore-controlling structure on gold mineralization in this area,so as to provide a theoretical reference for the analysis of the prospecting potential in the deep and peripheral areas of the mining area.The study came to the following understanding:(1)The main ore-controlling factors of Jinchangyu gold deposit are analyzed.Although the gold deposit mainly exists in the ductile shear zone,the study of ore-controlling structure found that the Jinchangyu gold deposit is not a typical ductile shear Cut-band gold mine.(2)The output of the Jinchangyu gold ore vein is mainly controlled by the structural physicochemical zone superimposed on the ductile shear zone in the later period.The structural physicochemical zone is its ore-controlling structure.(3)Identify the fourth-stage structural deformation: the first-stage structure is mainly a ductile deformation structure characterized by north-east trending structures,mainly the ductile deformation of the surrounding rock and green rock.The second-stage deformation is brittle deformation,forming northeast,northwest,near south-north and gently inclined structures.The third stage is a northeast-direction inherited structure,with obvious brittle physicochemical characteristics,and the fracture structure of ore minerals is developed.The fourth stage is a brittle fault,which is also muddy and unfilled on the fault surface.It is the latest brittle structure,all of which are late north-east brittle faults,unfilled,and fault mud is seen in the fault.(4)Observation results of field geological characteristics show that the alteration zoning features in this area are obvious,the early period is chlorite,followed by sodiumization,potassiumization,silicification,sericinization,and carbonateization.(5)In the structural physicochemical zone following the ductile shear zone,the ore deposit as the source layer of the plagioclase amphibolite was pre-gold under the action of the structural weak zone formed by the early folds and the ductile shear transformation Enrichment,and then under the influence of Mesozoic tectonic magmatism,the pre-enriched gold-bearing geological body was reactivated,and gold was enriched again in place to form a deposit. |
PDF Full Text Request