Cenozoic accelerated erosion of the Emeishan, eastern margin of Tibetan Plateau

Based on low-temperature thermochronology data, e. g. , AFT, ZHe and ZFT, it suggests a coupling correlation between the deformation and cooling processes and thermochronology data at the Emeishan area, eastern margin of Tibetan Plateau. AFT and ZHe ages range from 4 Ma to 30 Ma, and from 16 Ma to 118 Ma, respectively. In particular, there is a distinct relationship between ZHe ages and their elevation, indicating of zircon paleo-PRZ here. Furthermore, the AFT ages at hanging wall of the Wanniansi fault are younger than 10 Ma, in contrast to ages larger than 10 Ma at the footwall, indicating of foreward thrusting and erosion process occurred at the Emeishan area. The thermal histories modeled with AFT, ZHe and ZFT data suggest accelerated erosion occurred after Late Cretaceous in the Emeishan, with rate of 0.2 similar to 0. 4 mm . a(-1) after Oligocene, and there is a total magnitude of rock uplift with 7 similar to 8 km at the basement-involved deformation zone. We thus argued that the mount-building processes and their uplift dynamics in the Emeishan should be attributed to the northeastward continental subduction of the Lhasa and Qiangtang blocks and initial extrusion of the eastern Asian block since the mid-Eocene across the eastern Tibetan Plateau.