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Cenozoic lithospheric deformation in Northeast Asia and the rapidly-aging Pacific Plate

Citation

Yang, T and Moresi, L and Zhao, D and Sandiford, D and Whittaker, J, Cenozoic lithospheric deformation in Northeast Asia and the rapidly-aging Pacific Plate, Earth and Planetary Science Letters, 492 pp. 1-11. ISSN 0012-821X (2018) [Refereed Article]

Copyright Statement

Copyright 2018 Elsevier B.V.

DOI: doi:10.1016/j.epsl.2018.03.057

Abstract

Northeast Asia underwent widespread rifting and magmatic events during the Cenozoic. The geodynamic origins of these tectonic events are often linked to Pacific plate subduction beneath Northeast Asia. However, the Japan Sea did not open until the late Oligocene, tens of millions of years after Pacific Plate subduction initiation in the Paleocene. Moreover, it is still not clear why the Baikal Rift Zone extension rate increased significantly after the late Miocene, while the Japan Sea opening ceased at the same time. Geodynamic models suggest these enigmatic events are related to the rapidly-aging Pacific Plate at the trench after Izanagi–Pacific spreading ridge subduction. Subduction of the young Pacific Plate delayed the Japan Sea opening during the Eocene while advection of the old Pacific Plate towards the trench increases seafloor age rapidly, allowing the Japan Sea to open after the early Miocene. The Japan Sea opening promotes fast trench retreat and slab stagnation, with subduction-induced wedge zone convection gradually increasing its extent during this process. The active rifting center associated with wedge zone convection upwelling also shifts inland-ward during slab stagnation, preventing further Japan Sea spreading while promoting the Baikal Rift Zone extension. Our geodynamic model provides a good explanation for the temporal-spatial patterns of the Cenozoic tectonic and magmatic events in Northeast Asia.

Item Details

Item Type:Refereed Article
Keywords:plate tectonics, geodynamics, Northeast Asia, Japan Sea, Baikal Rift Zone, stagnant slab, tectonics, subduction
Research Division:Earth Sciences
Research Group:Geology
Research Field:Tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Whittaker, J (Dr Jo Whittaker)
ID Code:125261
Year Published:2018
Funding Support:Australian Research Council (DP150102887)
Deposited By:Oceans and Cryosphere
Deposited On:2018-04-10
Last Modified:2018-05-03
Downloads:0

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