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A-ICP-MS zircon U-Pb geochronology and geological significance of Xiba granitoids from Qinling, central China

Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis(2009)

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Abstract
Xiba granitoids are located in the South Qinling tectonic belt, Shaanxi province, which consist of granodiorite, monzogranite and tonalite. LA-ICP-MS zircon U-Pb dating yields two concordant ages, 219±1 Ma for monzogranite sample XB01-2, and 218±1 Ma for granodiorite sample XB06-1. The ages for two samples are uniform in test errors, indicating a crystallization age of ~218 Ma. This result, together with the previous studies concerning regional tectonic setting and geochemical characteristics of Xiba granitoids, show that they are produced in the magmatism event of the main orogenic stage of the Qinling orogenic belt. © 2009 Peking University.
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Key words
Granitoids,LA-ICP-MS,Qinling orogenic belt,Xiba pluton,Zircon U-Pb
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