首页|Genesis and tectonic setting of Early Jurassic granitic rocks in Huashan Town,Xingcheng,western Liaoning
Genesis and tectonic setting of Early Jurassic granitic rocks in Huashan Town,Xingcheng,western Liaoning
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There are a large number of Mesozoic intrusive and volcanic rocks in western Liaoning of China,which is an ideal place to study the Mesozoic Paleo-Pacific subduction processes,and lithospheric destruc-tion of North China Craton.Detailed petrographic,zircon U-Pb dating and geochemical studies of the Early Jurassic granites in Huashan pluton,Xingcheng,western Liaoning,indicate that the Early Jurassic granites were formed at 184-174 Ma,mainly composed of syenite and monzogranite.The geochemical characteristics show high contents of SiO2,Al2O3 and Na2O+K2O,low contents of Fe2O3 and MgO,enrichment in LREEs and LILEs,and depletion in HREEs and HFSEs,and have a high content of Sr and low contents of Y and Yb,with weak negative Eu anomalies and slightly negative anomalies of Ce,indicating that they are a set of intermediate-acidic adakitic granites in high-K calc-alkaline series.All the facts significantly suggest that the Early Jurassic adakitic granites were formed at the active continental margin in the context of Paleo-Pacific plate subduction.
geochemistrypetrologyadakiteNorth China Cratonwestern Liaoning
ZHAO Junfeng、LI Weimin、LIU Tongjun、GAO Jinhui
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College of Earth Sciences,Jilin University,Changchun 130061,China
Key Laboratory of Mineral Resources Evaluation in Northeast Asia,Ministry of Natural Resources,Changchun 130026,China
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