The Arabia-Eurasia convergence led to the uplift of the Zagros orogenic belt and the outward propagation of the fold-and-thrust system. In this paper we focus on the Miocene strata in southwestern Iran to study the and uplift history of the Iranian Plateau. establishment of a time scale ranging from 14 Ma to 10 Ma. Petrographic data of sandstones indicate a remarkable change in the provenance of the sediments from feldspar sandstone to lithic-dominated sandstone beginning at 13 Ma. The U-Pb ages of detrital zircons also demonstrate a dramatic shift at 13 Ma. Based on these new data, we discuss the uplift and denudation processes of the Zagros orogenic belt. During the late Oligocene to early Miocene (25-17 Ma), what is pied by a vast epicontinental sea, and both uplift due to the initial Arabia-Eurasia collision. During the middle Miocene (17-13 Ma), the source material was mainly eroded from enced some uplift but with limited height and thus could not have provided a large amount of source material to the foreland basin. After 13 Ma, the I3igh Zagros underwent accelerated uplift and became a new source region for the infill of the foreland basin. In this study, we provide new evidence for the uplift and denudation history of the SSZ and I3igh Zagros during the Neogene.