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Geochemical characteristics and tectonic significance of Jurassic granites in Huanggoushan area,south of Jilin,China

QIN Ya1a,LIANG Yi-hong1a,HU Zhao-chu2,LIU Xue-song1b 1a.College of Earth Sciences;1b.Museum of Geology,Jilin University,Changchun 130061,China; 2.Faculty of Earth Science,China University of Geosciences,Wuhan 430074,China  
By the field geological survey of the rocks,silicate full analysis,trace elements analysis and LA-ICP-MS zircon U-Pb dating,the authors explore the dynamics environment of the granite from the Huanggoushan area in the south of Jilin Province of China.The results show that the Laotudingzi and Caoshan plutons which LA-ICP-MS zircon U-Pb age is 178~181 Ma,consist mainly of biotite granite in the Huanggoushan area.The intrusions have high silica content(the mass fraction of SiO2 is 72.04%~73.68%) and belong to metaluminous to peraluminous high-K calc-alkaline Ⅰ-type granite.The REE(the mass fraction of ∑REE is 94.24×10-6~170.14×10-6) have the right-deviation patterns and moderate negative Eu anomaly(δEu=0.51~0.69).On the primitive mantle-normalized spider diagrams,the granites show positive K,Rb and Th anomalies and negative Ba,P,Ti,Nb,Ta anomalies,having the geochemical characteristics of an active continental margin magmatic arc,and their formation is related to the subduction of the ancient Pacific plate to North China plate.
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