The Tectonic Lithofacies Geological Mapping And Ore-controlling Tectonic Analysis Of The Pangushan Tungsten Deposit,South Jiangxi Province

The Pangushan tungsten deposit is located in the Yudu-Ganxian ore concentration area,which belongs to the eastern part of the Nanling metallogenic belt,and is one of the most important tungsten polymetallic deposits in the Nanling metallogenic belt.The vertical zoning of the tungsten mineralization is very obvious,which made this deposit became the research base of famous “five-storeyed” type.After nearly a century of more than one thousand meters of mining exploration,the distribution of deep resources is not clear and reserves are difficult to meet the needs of production.In order to carry out the deep ore prospecting,the study of the controlling factors of the deep tectonics is urgent.Based on the thought of combine structure with formation,this paper used tectonic lithofacies geological mapping and ore-controlling tectonic analysis to study the deep-seated metallogenic pattern.Through a large number of field geological survey and laboratory analysis,the main achievements and understandings are as follows:1.This papper firstly measured the tectonic lithofacies spatial distribution map(1/1 million)of Pangushan Tungsten Deposit,which include five typical middle section about 600 meters in vertical from 35 to 635 and 9 tectonic lithofacies zoning profiles.This work has greatly improved the research level of this mine.2.The rock and mineral markers in the interior and exterior of the tectonic altered zone are established.The tectonic lithofacies zoning shows that the alteration mainly occurred in the fissures of the vein and the dense part of the fracture.In the plane,from both sides of the lode,alteration zone changes from the rich biotite hornfels,normal biotite hornfels to the sericite quartzite,sericite quartz with weak rock zone gradually,and the alteration and mineralization degrees of NWW structure was stronger than NEE;in the profile,to make the ore dense belt of north,middle and South group as the center,the alteration was gradually weakened outwards.In the shallow,the strike of Structural alteration zone is NWW and NEE and the strike of Structural alteration zone is gradual changed to the NWW.3.The research of the stress field shows that the mining area is controlled by the new Cathaysian tectonic system,and the principal compressive stress direction of the mining area is NW-SE-NWW-SEE-NE-SW.The projection of all joint data shows that the joint direction of the area is concentrated between NWW 270°to 290°.4.This papper established vertical zonality of the structures in the Pangushan deposite.The shallow ore-control structure was formed by two sets of conjugate fractures,and the strike of the fractures are NWW-SEE and NEE – SWW.The former fracture is more development than the latter one.Besides,the strike of the deep structure has gradual transited to the NWW-SEE,and the fracture of NEE-SWW is not developed.On the basis of the study of the new Cathaysian tectonic system in the mining area,this paper emphasizes on the metallogenic regularity of the "Yangtze River" ore controlling structure,and provides a new understanding about the further development of ore prospecting.5.This paper analyzed the geometrical distribution rule of the echelon type structure.The function relationship between the three main elements of a echelon structure is tan?=?/1-?;?: the echelon angle;The sharp intersection between a single pulse and an echelon plane.?: the recurrence rate about the length of the pulse between the two echelon.?: the distance between the two echelon.Based on the ?,?,?,the echelon type can be divided into three kinds: ?: type: 0 ° <?< 10 °,?< 0.15;0 <?< 0.18;?: 10 ° <?< 45 °;0.15 <?< 0.50;0.09 <?< 0.85;?: 45 °<?< 90 °;0.5 <?< 1;?> 0.6.On the basis of above research,combined with geophysical and geochemical exploration and mine data,the target area(in the South and southeast of the mine area)has been verified,which revealed two veins about 20 cm and 10 cm longth.