Detrital Zircon U‐Pb Geochronology of the Triassic Sandstones from the Yanyuan Basin of Southwestern Sichuan, China

Abstract

The Yanyuan and Sichuan Basins, located at the southwestern margin of the Yangtze Block, are separated by the Kangdian Oldland. The provenance of the Upper Triassic sediments deposited in the Sichuan Basin has been extensively studied much based on detrital zircon UPb geochronology (Zhang et al, 2016; Zhu et al., 2017; Yan et al., 2019). However, the provenance of the Upper Triassic Boda Formation in the Yanyuan Basin still remains unresolved. In order to constrain the paleogeographic evolution of the western margin of the Yangtze Block during the Triassic, this work conducted detrital zircon dating on two Triassic sandstone samples collected from the Yanyuan Basin.