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Geochronology and geochernistry of Paleozoic granitic plutons from the eastern Central Qilian and their tectonic implications
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2008
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EngineeringPrecambrian GeologyTectonic EvolutionPaleozoic Granitic PlutonsEarth ScienceEastern Central QilianMesozoic TectonicsGeochronologyCentral Qilian.la-icp MsXindian PlutonsCa.the RocksIgneous PetrogenesisEast Asian LanguagesGeologyTectonic ImplicationsTectonicsGeochemistryIgneous PetrologyPetrology
The Dongjiazhuang and Xindian Plutons are emplaced in Proterozoic metamorphic rocks of the Central Qilian.LA-ICP MS zircon U-Pb data indicate that the emplaced ages of these two plutons are Paleozoic.The plutons are peraluminous,showing characteristics of high K and K/Na,and low Mg,Fe,and Ca.The rocks are enriched in Rb,Th,Pb,LREE and depleted in Ba,Nb, Sr,P,and Ti,with Eu positive anomaly.Their(~(87)Sr/~(86)Sr)_i are respectively 0.7129 and 0.7106,ande_(Nd)(t)are-6.6 and-5.2. Based on these geochemical characteristics,we conclude that the plutons are S-type granites whose source rocks were metagreywacke, and their tectonic settings belong to syn-collision.