A review of magmatism and deformation history along the NE Asian margin from ca. 95 to 30 Ma: Transition from the Izanagi to Pacific plate subduction in the early Cenozoic

The Mode of Trench-Parallel Subduction of the Middle Ocean Ridge

“…In this period, the young, hot and hightopographic MOR subducted under the Eurasian plate, which had strong positive buoyancy and enhanced coupling with the eastern edge of the Eurasian plate. The eastern Eurasian margin changed from regional extension to local compression (Liu et al, 2020;Zhang et al, 2020). During this period, the Northeast China regional topography also experienced obvious tectonic uplift (Wang et al, 2013;Song et al, 2014), similar to case RS01 at 7.5-14 Myrs when the overriding continental plate experienced rapid uplift (the red line in Figure 5).…”

“…Analog model experiments further show that ridge subduction has a strong impact on the accumulation and migration of the accretionary wedge and the shape of the subduction zone edge (Wang et al, 2019). On the other hand, for trench-parallel MOR subduction, large-scale MORB-like igneous rocks erupt at the trench, which has a large influence range but a relatively short duration (Gutiérrez et al, 2005;Müller et al, 2016;Liu et al, 2020). For instance, early Cenozoic MORB bedrocks have also been found in Hokkado, Japan (Maeda and Kagami, 1996;Nanayama et al, 2019).…”

“…MOR subduction along the western boundary of the Pacific plate in the early Cenozoic and along the eastern boundary of the Pacific plate at present is primarily viewed as trench-parallel (Seton et al, 2015;Müller et al, 2016;Tang et al, 2018;Liu et al, 2020). In this study, we focus on the different modes of trenchparallel MOR subduction and the related key controlling parameters.…”

Cretaceous to Miocene NW Pacific Plate Kinematic Constraints: Paleomagnetism and Ar–Ar Geochronology in the Mineoka Ophiolite Mélange (Japan)

“…The Pacific slab, that subducted after Izanagi–Pacific ridge, is visible on mantle tomography, as a 2,500 km long, west‐dipping flat slab below Japan, located in the upper mantle, and is disconnected from deeper anomalies in the lower mantle (Seton et al., 2015; van der Meer et al., 2018). However, the plate kinematics of Izanagi–Pacific ridge subduction, exact timing, and orientation of the plate boundaries are under debate with several options including: (1) strongly oblique to the Japanese coast (e.g., Maruyama et al., 1997), (2) almost parallel to it (e.g., Liu et al., 2020; Seton et al., 2015; Whittaker et al., 2007; Wu & Wu, 2019), and (3) a marginal sea closure which would not include ridge subduction below Japan (Domeier et al., 2017). Ridge subduction would have caused a slab detachment that possibly triggered a plate‐driven force change and a change into the mantle flow in the area of East Asia.…”

Age, Petrogenesis and Tectonic Implications of the Late Permian Peraluminous and Metaluminous Magmatic Rocks in the Middle Gobi Volcanoplutonic Belt, Mongolia

“…The upwelling of asthenospheric mantle through the slab window provides high heat flow that can induce partial melting of the slab edge, overlying mantle wedge and/or upwelling asthenospheric mantle and crustal rocks, and can produce a wide variety of magmas (e.g., Sisson et al, 2003). Ridge subduction in the CAOB was introduced by Windley et al (2007) and it was one of the most remarkable tectonic setting that responsible for the many key features of the CAOB, as the modern circum-Pacific accretionary orogens (Liu et al, 2020;Ganbat et al, 2021c).…”