Structural Alteration Mapping And Deep Prediction Of In The Pangushan Tungsten Deposit,south Jiangxi Province

South Jiangxi province is the most important tungsten production and resource base in China,and is also the most famous tungsten concentration area in the world.The Pangushan tungsten deposit in southern Anhui is a typical mining area of the “five-floor” vertical mineralization zone.The research on rock,minerals,geochemistry,wall rock alterations and mineralization in the mining area is in-depth.However,these studies mainly target industrial ore bodies.With the mining of shallow mines,deep prospecting has become the only way for the sustainable development of mines.At present,deep prediction still lacks systematic and spatial intensive construction and in-depth research.In this paper,the ore-controlling fault combined with wall-rock alteration is regarded as a new sign of deep ore-prospecting,and it has important geological survey significance and application value of deep prospecting.This study relied on the National Science and Technology Support Program “Model demonstration of ore-controlling and ore-forming rules in the typical ore field in Yudu-Yuxian County,Nanling”.Based on the idea of tectonic petrofacies,a large-scale mapping map was constructed to explore the spatial distribution of tectonic alteration mineralization,and a comprehensive study was conducted in conjunction with indoor test analysis.Get the following main knowledge and achievements:(1)Reveal the vertical variation pattern of the ore-controlling structure from the surface to-600 meters depth.The shallow veins in the surface are controlled by the conjugate NEE-SWW and NWW-SEE faults and multiple structural tectonic fractures.The depth gradually transitions to the obvious change from NWW-SEE to a group of fault ore controls.(2)Research confirms that the altered structure of the extension structure is stronger than that of the extrusion structure.The systematic analysis data indicate that the NWW extensional shearing structure is more altered than the NEE extrusion shearing structure,the alteration scale is greater,and the ore-bearing nature is better.The width of NWW extensional facies is 90-400 meters.There are 21 developedprofile veins with high grades,while the width of NEE compressive tectonic facies is only 50 meters.There are no industrial veins in the measured profile.(3)Controlling the fracture strength of the controlled ore in the mining area,the strength of the alteration zone gradually weakens away from the fracture.Tectonic deformation and differential stress show that the normal biotite corner strain ratio near the fault zone is 2.8375,and the differential stress value is 377.16×105Pa;the weak sericite mica-quartzite strain ratio far from the fault zone is 2.429,and the differential stress value is 296.62× 105 Pa.The analysis of tectonic erosion into ore fluids shows that the homogenous temperature,cation Ca2+,Na+,and SO42-contents of the rich micaceous mica kerogen are all higher than those of weak sericite mica.This indicates that the mineralization of the rich biotite kerogen near the fault zone is strong,while the mineralization of the weak sericite quartzite zone far from the fault zone is weak.(4)The “construction correction measurement” of the Pangushan tungsten ore deposit is between-1723.97 m and-3258.94 m.It indicates that the deep mine still has good prospects for mineralization.(5)The deep prospecting forecast has been verified.Based on the above research,the research team combined the geophysical prospecting and mining data to guide the prediction of hidden mines.Two hidden veins of 20 cm and 10 cm were found in the mine's tunnel.