Zircon U-Pb geochronology, geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia
作者：LIU Hanlun,WANG Keyong,LI Jian,CAI Wenyan,TANG Wenhao,WANG Changhong
摘要：The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of syenogranite in Angeer Yinwula area, China, with the aim of determining its formation time, petrogenesis and regional setting. Zircon U-Pb data obtained by LA-ICP-MS indicate that the syenogranite formed in the Early Cretaceous (136.1±0.9 Ma). Geochemically, the rock is characterized by high SiO 2 (76.63%- 77.58%) and Na 2O+K 2O (8.00%- 8.32%), low MgO (0.02% 0.04%) and TFe 2O 3 (0.51% 0.84%), and is enriched in LREEs and LILEs, depleted in HREEs and HFSEs. It belongs to high-K calc-alkaline, metaluminous-weakly peraluminous, exhibiting an affinity to I-type granite. All these characteristics implied that the syenogranite in this region derived from crust-mantle mixed source. Overall, the regional geology, geochronology and geochemical features suggest that the formation of the syenogranite was related to the subduction of the Paleo-Pacific Ocean.
发文机构：College of Earth Sciences
关键词：syenograniteZIRCONU-PBDATINGGEOCHEMISTRYtectonicsettingAngeerYinwulaareaPaleo-PacificOcean
分类号： P[天文地球]
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