The tectonic evolution of the western Pacific since the late Cretaceous has been dominated by convergence among the Pacific/Paleo-Pacific Plate, the Philippine Sea Plate (PSP), and the Eurasian Plate. From the late Cretaceous to the Paleocene, with the termination of the long-term westward subduction of the Izanagi Plate, the Pacific Plate began to subduct beneath the Eurasia Plate, followed by the northwestward movement of the PSP (Gurnis et al., 2012;Matthews et al., 2016;Zahirovic et al., 2014). However, there is still no consensus on the detailed tectonic history of the western Pacific, especially the style and time frame of the subduction of the Izanagi Plate at the Eurasian margin (