Petrogeochemistry and zircon U-Pb age of the Mayu granodiorite in the southern section of Ailaoshan tectonic belt

This study presents bulk petrogeochemistry and zircon U-Pb dating results for the Mayu granodiorite in Mojiang, Yunnan. LA-ICP-MS zircon U-Pb dating results show that the Mayu granodiorite was formed in the Late Permian period (263.6±2.4Ma). The Mayu granodiorite is characterized by SiO₂ content of 59.56%~70.50%, alkali (Na₂O+K₂O)5.16%~7.92%, and Na₂O higher than K₂O. It is enriched in LREE and Sc, Hf, and depleted in Sr, Zr, Th, U, with negative Eu anomalies (δEu:0.84~1.32). According to the diagrams, the Mayu granodiorite was formed in a tectonic environment of island arc-continent or continental-arc collision, indicating that the branch of Paleo-Tethys Ocean or arc basin in Ailaoshan tectonic belt may have been closed in the Late Permian (263.6±2.4Ma).