Zircon U-Pb Age,Geochemistry Characteristics and Genesis of the Piaotang'ao Granite in Northern Guangdong
The Piaotang'ao granite in northern Guangdong is located in the south of Zhuguangshan plu-ton.The pluton is closely related to iron mineralization,the research degree is low,and there are still many debates on the division of stages and genesis.The analysis of geochemistry characteristics and LA-ICP-MS zircon U-Pb age in Piaotang'ao granite,northern Guangdong,shows that the contents of Si,K and Na are low,with ω(SiO2)ranging from 49.92%to 53.41%,ω(K2O)ranging from 0.93%to 2.34%,ω(Na2O)ranging from 0.72%to 1.60%.Iron,magnesium and calcium content is rich,ω(TFeO)is 7.69%～10.08%,average 9.07%,ω(MgO style)is 10.53%～18.14%,average 13.07%,ω(CaO)is 7.67%～11.38%,average 9.32%.The total amount of rare earth elements(ΣREE)is 83.11×10-6～222.71×10-6,and the partitioning pattern is roughly to the right.Eu loss is obvious,δEu value is higher than 0.76～0.89,and the average value is 0.82.The incompatible elements Rb,K,U and P were enriched,while Ba,Sr and Ti were significantly depleted.LA-ICP-MS zircon has an age of 429.0±12 Ma.The above analysis results show that the Piaotang'ao granite belongs to crust-mantle mixed type granite,which is the product of early Silurian magmatic activity,and the magma mainly comes from the melting of crustal materials and some mantle materials.
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