Geological Conditions Analyze And Metallogetic Prediction Research Of Shangca Tungsten Ore Deposit In Dongyuan, Guangdong Province

Research area is in the south section of the Wuyi national key metallogenic,the edges in northwest of Zijin-Huiyang sag fold fault zone, the northeast section in the north east Heyuan deep fault, is located in the northwest new huaxia structural belt of the Lianhua,Experienced a period of tectonic movement,Indosinian movement and Yanshanian movement.Faults,folds,and igneous rocks are common in the area,particularly Yanshannian intrusive and extrusive rocks.On a structural map,this area is located to the north of Heyuan deep fault,both of Which were generated by Indosinian movement and now serve as a boundary of Guangdong tertiary tectonic block.Thesis work through a large number of field surveys, based on the collection of relevant information and geochemical, analysis of geology, geological characteristics of ore,ore-controlling factors the terms were studied on Shangca tungsten ore of Dongyuan County,and achieved the following understanding:(1) According to the geological characteristics of the deposit, found mainly quartz vein type mineralization is mainly concentrated in quartz veins filling fractures and fissures;regional mineralization and alteration with silicification, pyrite mineralization, sericite and potassic, lead-zinc technology, followed by visible greisenization, limonite, chlorite, etc.,mineralization and alteration associated with the W, Mo element etc. These can be used as tungsten ore mineralization and alteration prospecting mark;(2) Formation and mineralization is closely related, mainly to provide a portion of the material source for the mineralization and influence the flow direction of the ore fluids; fold structure, favorable metallogenic site is mainly anticline plunging end and the wing sections,obliquely syncline raised main ore-rich region at the contact interface by a steep slowing concave portion, mainly F1 fault and Renzishi fault, fracture mainly siliceous quartz veins filling and replacement, large-scale mineralization provide favorable space for the filling and replacement ore fluid; biotite granite mining a rich source of material for the tungsten ore mineralization;(3) Based on the surrounding rock geochemical analysis through major elements, rare earth elements analysis, it was found nearly ore peraluminous granite belonging to high-K calc-alkaline type, which belongs to the post-orogenic granite(POG), its tectonic setting is a drawing environment; rare earth elements with LREE enrichment, Eu negative anomaly characteristics;(4) According to the characteristics of strata, magmatic rocks ore joint control, the separation of the three divisions ore prospect: the eastern mining area for the primaryprospective area, the midwest for the secondary prospective areas, south east for the third prospective areas.