Journal of Jilin University(Earth Science Edition) ›› 2015, Vol. 45 ›› Issue (5): 1394-1404.doi: 10.13278/j.cnki.jjuese.201505112

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Geochronology and Geochemistry of Trachyandesite of Naozhi Gold Deposit in Yanbian Region,Southern Jinlin Province and Its Geological Significance

Liu Jinlong, Sun Fengyue, Lin Bolei, Wang Guan, Xu Qinglin, Ao Cong   

  1. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2014-12-23 Published:2015-09-26

Abstract:

LA-ICP-MS zircon U-Pb dating and geochemical data of the trachyandesite rocks from Jingouling Group in Yanbian region are obtained to figure out their formation time and the regional tectonic background. The zircons from the trachyandesite rocks are euhedral in shape with oscillatory ring displaying in CL images with high Th/U valwes 0.43-0.71(> 0.40). This implies their magmatic origin.The dating results indicate that these rocks formed in Early Cretaceous(130±2 Ma,MSWD=1.8). The composition of these rocks fall into the calc-alkaline category with enrichment in LILE(such as K,Ba,Rb),LREE and more mobile incompatible elements, such as Th, U, relative depletion of HFSE(such as Ta,Nb,Ti,P). Combined with their high Mg# values (43-52) and Na2O/K2O=1.73-2.25(> 1.17), it shows the characteristics of the rocks from an active continental margin magma. Based on its Nb/Ta (14.40-14.72), Rb/Sr (0.10-0.18), Th/Nb (0.29-1.04), and Ba/La (17.61-23.92),we conclude that the magma was a mixture of crust and mantle material. Together with the research of regional tectonics, the corresponding geodynamic mechanisms responsible for the formation of the rocks may be closely related to the subduction of Paleo-Pacific plate and Izanagi plate towards Eurasia continent.

Key words: zircon U-Pb chronology, geochemistry, Jingouling Group, trachyandesite rocks, active continental margin, Naozhi gold deposit

CLC Number: 

  • P588.144

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