The Geological Characteristics,Genetic Model And Prospecting Direction Of The Copper Mine Deposit In The Shu Jia Dian

Taking part in the practical work of the key project of Anhui provincial geological prospecting fund,"the census of copper deposits in the deep part and the periphery of the Tongling copper mine in An Hui",the recognition of the deposit gradually deepened with the continuous exploration.Based on the combination of field practice and indoor work,this paper summarizes the metallogenic geological characteristics of the Shu Jia Dian porphyry copper deposit,and preliminarily establishes the metallogenic model,and points out the next direction of prospecting.The Shu Jia Dian deposit is located in the Tongling ore concentrated area.The tectonic position is the next level Guichi-Tongling uplift belt in the Shitai-Ningguo fold thrust belt,the northern margin of the Yangtze plate,the lower Yangtze to the Indo China,the northeast to the middle and lower reaches of the Yangtze River and the foreland tectonic belt.Rock Tongling shujiadian deposit for the middle Silurian Fentou formation(S₂f),shujiadian anticline and its derived North East fracture(layer)fracture zone is shujiadian important porphyry copper ore control structure.The intrusive rocks are mainly quartz diorite porphyry and pyroxene diorite two,quartz diorite,mainly for the Yanshan times in the late intrusive,magmatic differentiation,magmatic source for EM II type enriched mantle,rising in the process of contamination of crust.Through the evidence of intrusion,interpenetration and catastrophe relationship between the field rocks,it is determined that the order of intrusion of the three intrusions is:the earliest emplacement is quartz diorite porphyry,followed by pyroxene diorite,and the last is quartz two long diorite.Through zircon U-Pb geochronology,the quartz diorite porphyry is the oldest(>146Ma),followed by pyroxene diorite(142-145Ma),followed by quartz two long diorite(140-142Ma).The mineralized rocks related to the mineralization of the Shu Jia Dian porphyry copper deposit are mainly pyroxene diorite intrusions,the second is quartz two long diastole Iwa Ista,and quartz diorite porphyry is also a metallogenic rock mass.The ore type is sulfide ore,and the ore minerals are mainly pyrite,chalcopyrite,non-opyroxene,plagioclase,quartz and so on.He has the ore structure shape,euhedral to subhedral granular structure,leaf shaped flake structure and cataclastic structure,have disseminated structure,veinlet and veinlet structure of main ore structure.The formation process of the deposit can be divided into magmatic period,hydrothermal period and epigenetic period.The hydrothermal stage can be divided into gas-liquid stage and hydrothermal stage two stages,gas-liquid phase divided into skarn sub stage and potassium feldspar sub stage,hydrothermal stage divided into sericite quartz sulfide sub stage and chlorite epidote sulfide sub stage and late illite,quartz carbonate sub stage.The substage of Sericite sulfide in the hydrothermal phase and the substage of chlorite epidote sulfide are the main metallogenic stages.There is a significant zoning phenomenon between copper mineralization and alteration of pyroxene diorite in the Shu Jia Dian deposit.The mineralization of disseminated ore in general pyroxene diorite is related to quartz sericite mineralization.Veinlet or veinlet disseminated mineralization is closely related to Yan Pan rock.Tongling porphyry copper ore prospecting direction is in the Tongling area of nearly East-West basement tectonic magmatic belt,with fracture of Indosinian folds and associated fracture zone,Yanshan period Granite Emplacement,plus rock metamorphic formation of the barrier is the porphyry copper metallogenic space and prospecting direction.