Ore-forming Factors And Metallogenic Prediction Of Zhuxi Tungten-copper Ore,Northeastern Jiangxi Province

Zhuxi tungsten-copper deposit in Jingdezhen,Jiangxi Province is a world-class tungsten-copper deposit discovered in recent years.The geological characteristics and isotope chronology of the deposits have been done in this area by predecessors and made a good results.However,the study of structural deformation is complex,vegetation is flourishing,and the ore-forming factors related to the deposit are mostly deep in the ground.There is lack of studies of structural ore-controlling mechanism,magma and the relationship between strata and mineralization,which restricts the further prospecting work.This thesis discusses tectonic ore-controlling system,magmatic system and lithologic ore-controlling system combining with metallogenic regularity,and concludes two stages of tectonic activities closely related to mineralization.At the same time,the main direction of regional tectonic stress is the northwest direction,which is verified by the magnetic fabric test.There is two Yanshanian intermediate-acid magma formed mica-type and scary-type tungsten-copper ore bodies by accumulation of metallogenic elements during the process of mica and skarnization.Thereafter,the nappe structure transformed the interface to form a slippage tectonic surface,forming a Si-Cal surface of the interlayer fracture zone,where a large number of fluids are easy to precipitate and mineralize.In addition,the controlling effect of strata on mineralization is mainly manifested in the high abundance of W,Cu etc.The unconformity interface between the two strata provides a good ore-hosting horizon for mineralization.Last but not the least,the "Si-Casurface" is easier to metasomatize,precipitate and enrich minerals from the geochemical point of view.Finally,the metallogenic model is established by synthesizing various research,and the prospecting criteria and prospecting model of W-Cu polymetallic deposit are put forward.On the basis of comprehensive evaluation of ore-controlling factors of "force-layer-body-surface-sink" in Taqian-Fuchun metallogenic belt,a prospecting idea centering on deep rock mass is proposed.According to the geological,geophysical and geochemical characteristics,five key prospecting and prediction areas are pointed out.