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《Journal of Jilin University(Earth Science Edition)》 2017-04
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Early-Middle Jurassic TTG Granites in Northwest of Lesser Xing'an Range:Its Geochronology,Geochemical Characteristics and Tectonic Significance

Zhao Yuandong;Che Jiying;Wu Datian;Xu Fengming;Zhao Jun;Li Shichao;School of Earth Sciences and Resources,China University of Geosciences;Shenyang Institute of Geology and Mineral Resources,CGS;  
This paper reports the Mesozoic TTGs outcropped in the Northwestern Lesser Xing'an Range,which was caused by the subduction of the Mongol-Okhotsk Ocean.The TTGs are composed mainly of tonalite,granodiorite,quartz-diorite,and diorite.The zircon U-Pb LA-ICP-MS dating provided the age of(171.1±1.3)Ma,(173.9±3.9)Ma,(178.3±1.5)Ma and(169.1±6.2)Ma corresponding to the four samples,indicating that the magma formed during the Early-Middle Jurassic.They are the High-Al_2O_3 T_1T_2G_1 based on the O'Connor's An-Ab-Or normative classification,and petrochemically belong to metaluminous or weakly peraluminous calc-alkaline series with enrichment in Si and Al,while poor in Fe,Mg,Ti,and Na.The LILE(e.g.Rb,Ba,Th,U,Sr)and LREE are enriched,while HFSE(e.g.Nb,Ta,Zr,Hf)and HREE are relatively depleted with slightly negative Eu anomalies.Such characteristics show that the TTGs have a similarity with type I granite in the Andes type orogenic belt.The low ratios of Sr/Y and(La/Yb)Nand the weakly negativeδEu indicate that the residual minerals in the source are hornblende,pyroxene and a little of plagioclase,and little garnet.The co-existence of diorite and tonalite in outcrops reflect that an incomplete and mechanical mixing of two or more magmas might occur,and the intrusion of the TTGs to the Proterozoic strata(such as Xinghuadukou Group and Luomahu Group)and the fact that the TTGs contains lots of captured zircons show that the TTGs magma experienced the assimilation and contamination of the wall rocks during their ascending up through the lithosphere.The authors conclude that the Jurassic TTGs were closely related to the closure of the Mongol-Okhotsk Ocean,and the subduction towards the southern massifs in that period.
【Fund】: 中国地质调查局地质调查项目(12120114055701);; 国家自然科学基金项目(41502063 41574093)~~
【CateGory Index】: P588.121
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