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Article by Li A
Article by Wang J
Article by Fu H
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Zircon U-Pb geochronology and petrogeochemistry of Wangqi granodiorite in central Jilin Province
LI Ao-peng1,2, WANG Ju-sheng1, FU Hai-cheng1
1. Geological Survey of Jilin Province, Changchun 130102, China;
2. College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: LA-ICP-MS zircon U-Pb chronological and petrogeochemical studies of Wangqi granodiorite in central Jilin Province have been carried out. The LA-ICP-MS zircon U-Pb dating results indicate that the crystallization age of Wangqi granodiorite is 172.5±1.4 Ma, i.e., the Middle Jurassic. In terms of major element composition, it has SiO2=65.03%~66.25%, Al3O2=15.41%~16.29%, Na2O=4.17%~4.29%, MgO=1.85%~2.01%, TFe2O3=4.66%~5.37%, and Mg#=41~44. It belongs to the medium-K calc-alkaline series. In terms of trace element composition, Wangqi granodiorite is characterized by enrichment in light rare earth elements (LREE) and the large ion lithophile elements (LILE, Rb, Th and U), depletion in heavy rare earth elements (HREE) and the high field strong element (HFSE, Nb, Ta, P and Ti), and weak negative Eu anomalies. It has Sr=514~587×10-6, Y=12.8~15.8×10-6, and Yb=1.27~1.58×10-6, exhibiting an affinity to adakitic rocks. These geochemical characteristics reveal that the magma of Wangqi granodiorite was derived from the partial melting of a thickened lower continental crust. Combined with the spatial distribution of the coeval igneous rocks, it is suggested that the Wangqi granodiorite was formed in an active continental margin related to the subduction of the Paleo-Pacific Plate beneath the Eurasian continent, and the collision-collage between Songnen-Zhangguangcai Range and Jiamusi massifs.
Keywords: zircon U-Pb age   petrogeochemistry   petrogenesis   Wangqi granodiorite  
�ո����� 2018-06-19 �޻����� 2019-01-22 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2019.01.009
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