Geological Characteristics And Ore Controlling Structure Of Tianjingwo Tungsten Tin Polymetallic Deposit In Southern Jiangxi Province

The research object of this paper is the tungsten and tin polymetallic deposit in the south of Jiangxi Province.Through the analysis of the previous data and the comprehensive geological exploration of the field system,the original cataloguing of the borehole core,the indoor comprehensive arrangement,cartography and analysis,the exposed strata in the mine area of the courtyard nest are analyzed.Based on the comprehensive observation of magma,tectonics and mineralization characteristics,the genetic mechanism and ore-controlling mechanism of the W-Sn polymetallic deposit are obtained.The Tianjingwo tungsten-tin deposit is located in the ancient Cathaysian land on the southeast side of the Qinghang junction belt,straddling the junction of the Wuyi and Luoxiao blocks and the superimposed contact zone of the two blocks.In the southern part of the Zhuguangshan metallogenic belt,the southern Jiangxi Province is located in the Yu-Yu(Upper)Jude concentration area.The deposit is a high-medium-temperature hydrothermal contact metasomatic tungsten tin deposit after Yanshanian magmatism.The fine porphyritic biotite granites and the moderately coarse porphyritic biotite granites were found in the boreholes under construction.Several altered skarnization zones were also found in some of the boreholes,and a small amount of tungsten minerals were found in the skarn zones.The ore exists in the skarn belt in the form of sparse leaching.Based on the analysis of the mechanism and characteristics of the formation of fold and fault structures in the area,it is concluded that the contact zone between the intrusive granite bodies in Yanshanian and the limestone strata of the early Paleozoic Ordovician Guting formation is the main factor of diagenesis and metallogenesis in the cavernous area.The thermal gas and liquid circulation mechanism is constructed by the contact zone of rock mass with the fold,fault structure and interlayer fracture of surrounding rock.NNE trending faults and Ordovician Guting formation limestone folds and interlayer slippage,extensional structure is an important ore-conducting structure,ore-storage structure,Yanshanian granite contact zone with limestone layer of Ordovician Guting formation is metallogenic time structure.At the same time,it is also the channel of hydrothermal migration and the location of orebody.The contact zone of rock mass and its surrounding rock are strongly altered,shallow metamorphic slate,hornstone and skarn are obviously developed,and the shape of contact zone of rock mass determines the distribution of orebody.On the basis of a great deal of analysis and careful study,on the basis of scientific research,after careful and in-depth field investigation,the paper collects a large amount of field geological basic data,and then from the area,mining area,ore deposit,The metallogenic geological background of ore bodies and ores is studied and analyzed step by step,and the relationship between strata,rock mass,structure and ore-controlling in the exposed mining area is deeply studied,and the metallogenic geological characteristics of the contact zone of rock mass are mainly discussed and summarized.The metallogenic law of the cavernous deposit is obtained.The results show that the skarn rock body in the pit of the courtyard is trending north to east,parallel to the ore-controlling fault,and many groups of faults are in the direction of NNE and NW,combined with the comprehensive analysis of the regional geological background,it is considered that the mine area of the cavernous pit is under extrusion pressure.The formation fold bends to form an inclined anticline,accompanied by interlayer sliding and fracture,forming a reverse fault in the NNE direction,accompanied by the intrusion of magma along the fracture fissure,and contact with carbonate rock,forming skarn type scheelite deposit.The formation,rock mass and its genesis are analyzed,and the prospecting direction of the mining area is pointed out.