| Xiaodongkeng tungsten deposit is located 29 km away from the southwest of Yudu County,Jiangxi Province,in the middle of the East-West Nanling tectonic belt,and in the southeast of the tantalum-beryllium-tungsten metallogenic belt of Yushan.The regional structure belongs to the junction between Dabu granite uplift area and Yudu fault depression basin,which is a newly discovered quartz vein type wolframite deposit with concealed external contact in recent years.Based on the previous work,through data collection analysis and comprehensive evaluation,this paper preliminarily established the spatial and temporal distribution and geochemical characteristics of concealed granite in the study area and discussed the mineralization and metallogenic significance of the ore.It summarizes the geological characteristics of its deposits,indicates its prospecting direction,and evaluates the resource prospects.The implementation of the project has achieved the following understanding and results:1.In Yushan Tungsten Rare Earth Polymetallic Metallogenic Belt,tungsten ore-forming conditions are superior.Cambrian strata distributed widely in the area is one of the favorable conditions for mineralization.This set of strata is rich in ore-forming elements such as W,Sn,Cu,Pb,Zn,Ag,etc.The main ore-forming elements of W,Sn and Pb in the strata are 1.5?3 times higher than the Clark value of the crust,which is one of the main sources of ore-forming materials of remelting granite and provides favorable conditions for the formation of ore deposits.The formation of the deposit is closely related to magmatism in the early and middle Yanshan period,and Cambrian strata are important ore-bearing strata and important metallogenic conditions of tungsten deposits.2.The vein group is a wing of the primary oblique joint(STR)of the concealed rock mass,so it can be inferred that another group of veins may be produced in the west of the mining area.The intersection of oppositely inclined vein groups is a favorable place for the occurrence of ore-bearing concealed granite,and it is also a favorable place for searching for the disseminated tungsten-tin deposit of Mao Ping-type mica-diagenetic granite.3.Using new technology and new ideas,the research work is carried out in the mining area which is denied the existence of industrial ore body deep by predecessors.Field investigation found that the mineralization in the belt has good marks,prospecting features good ore-forming geological background,and research suggests that deep mineralization may,decorate in the logo belt to the west 100 meters deep engineering validation,finally a new agent for quartz vein type tungsten deposit of medium-sized scale,"old new evaluation" there is still hope for prospecting breakthrough.4.The formula of F1 fault structure,porphyry vein ore control and quartz vein type tungsten ore prospecting in the lower Cambrian Niujiahe group is established.The tungsten-Tin polymetallic deposits of large and medium-sized deposits are obtained in the study area under the guidance of ore prospecting model. |
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