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LA-ICP-MS Zircon U-Pb Ages and Geochemical Characteristics of Sarijia Intrusion in Duowa Area of West Qinling, China and Their Geological Implications(PDF)


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LA-ICP-MS Zircon U-Pb Ages and Geochemical Characteristics of Sarijia Intrusion in Duowa Area of West Qinling, China and Their Geological Implications
MA Tao1 LU You-peng1 DAI Jun-feng23* LI Jin-xi1 NIU De-cao1 PU Wan-feng1
(1. The Third Institute of Geological and Mineral Exploration of Gansu Provincial Bureau of Geology and Mineral Resources, Lanzhou 730050, Gansu, China; 2. State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; 3. School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China)
granite geochemistry zircon U-Pb age geological characteristic petrogenesis tectonic setting West Qinling
P588.12; P597
West Qinling orogenic belt is characterized by large amounts of Indosinian high-K calc-alkali granites, and the age and genesis of granites are essential to understand the tectonic evolution and magma activity in West Qinling. The detailed field geological investigation, petrography observation, LA-ICP-MS zircon U-Pb ages and geochemistry of whole rock for Sarijia intrusion in Duowa area of West Qinling were studied with the aim of ascertaining the age, genetic type and geodynamic background of the intrusion. The results show that Sarijia intrusion is composed of dacite porphyrite, granite porphyrite and slight quartz diorite; granite porphyrite has a LA-ICP-MS zircon U-Pb age of(238.2±2.6)Ma(MSWD is 1.7); Sarijia intrusion belongs to peraluminous and high-K calc-alkali series, which is enriched in large ion lithophile elements(Th, Rb and K)and light rare earth elements(LREEs), and depleted in high field strength elements(Nb, Ta and Ti, etc.), indicating that the magmatic source is characterized by crust-mantle mixing; the characteristics of major and trace elements show that dacite porphyrite belongs to I-type granite and forms in the ocean-continent subduction-related island arc enviroment, while granite porphyrite belongs to S-type granite and forms in the continental collision setting. Therefore, it is proposed that Sarijia intrusion is emplaced at Late Triassic when the tectonic setting is transformed from ocean-continent subduction-related environment to continental collision setting.


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