The Geochemical Charaterstics And Diagenetic Ages Of Granitic Rock Of Kunshan Molybdenum Copper Deposit,jiangxi Province

Kunshan molybdenum copper mine in jiangxi beds deposit is located in the centre of the Jiuling Tin tungsten molybdenum polymetallic metallogenic belt and in the southern part of Da Hutang ore field.Intermediate acid complex bodies exposed in the area,which has long been regarded as the outcome of magma intrusion activities in jinning epoch and yanshan epoch.The yanshanian granite is given priority to porphyritic biotite granite,and second is granitic porphyry.Kunshan molybdenum copper deposits with features of yanshan epoch and Jinning epoch granite as the research object,and based on the petrological characteristics of granite,rock formation and tectonic environment discrimination,and element geochemical characteristics and LA ICP MS zircon U-Pb in aspects of the study,the results showed that:1)In the aspects of characteristics of main elements,main elements in the deposit has been found in Yanshanian and Jinning epoch granite,which yanshanian granite in the geochemical discrimination diagram shows high silicon,high potassium,alkali,strong peraluminous,high potassium calc-alkaline series..Jinning epoch granite in geochemical discrimination diagram shows high silicon,potassium,calcium alkali or alkali.2)In the aspect of trace element characteristics,Kunshan molybdenum copper deposit in yanshan epoch granite,on the whole,shows the strong incompatible element enrichment,Ba,Nb,Ti,K performance for heavy losses and Ce,Zr,which is slightly losses;Jinning granite epoch,on the whole,shows the strong incompatible element enrichment,and Ba,K,P,Ti are heavy losses and weak loss of Nb,Ta,Sr.Yanshanian granite has the similar characteristics of each element in the Jinning epoch granite,the primitive mantle spider standardization diagram shows good consistency with W type,which suggests that both come from the same source region.3)In the aspect of characteristics of rare earth elements,Kunshan deposits outcropped yansha epoch granite and Jinning granite epoch,REE chondrite standardized distribution curve shows heavy rare earth is in obvious fractionation,enrich light rare earth type to the right,characteristics of Eu are obviously negative anomaly.4)Through the trace element diagrams.ore deposit in kunshan yanshan epoch like porphyritic granite should be A granite of strong peraluminous type,Jinning epoch granite should be strong peraluminous granite S type.5)Yanshan porphyritic granite of Kunshan deposit formed for the estimation of collision decompression stretch the structure of the transition back to the plate Scene,and collision and volcanic arc granites formed in jinning period with mixture of tectonic background6)Kunshan deposit of yanshan epoch granite rock's formation age was 154.4Ma,which is the same to the Jiuling area of large-scale diagenesis peak age(140 ~ 160 Ma)and is consistent with Kunshan deposit granite rock and formation age of Jinning epoch was 810 Ma,which is consistent with the mass of the neoproterozoic and Jiuling area diagenesis peak age(800 ~ 900 Ma).