气候变化领域集成服务门户(CCPortal): Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago

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DOI	10.1038/s41561-021-00862-6
	Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago
	Hu J.; Gurnis M.; Rudi J.; Stadler G.; Müller R.D.
发表日期	2022
ISSN	1752-0894
卷号	15 期号:1
英文摘要	A drastic change in plate tectonics and mantle convection occurred around 50 Ma as exemplified by the prominent Hawaiian–Emperor Bend. Both an abrupt Pacific Plate motion change and a change in mantle plume dynamics have been proposed to account for the Hawaiian–Emperor Bend, but debates surround the relative contribution of the two mechanisms. Here we build kinematic plate reconstructions and high-resolution global dynamic models to quantify the amount of Pacific Plate motion change. We find Izanagi Plate subduction, followed by demise of the Izanagi–Pacific Ridge and Izu–Bonin–Mariana subduction initiation alone, is incapable of causing a sudden change in plate motion, challenging the conventional hypothesis on the mechanisms of Pacific Plate motion change. Instead, Palaeocene slab pull from Kronotsky intraoceanic subduction in the northern Pacific exerts a northward pull on the Pacific Plate, while its Eocene demise leads to a sudden 30–35° change in plate motion, accounting for about half of the Hawaiian–Emperor Bend. We suggest the Pacific Plate motion change and hotspot drift due to plume dynamics could have contributed nearly equally to the formation of the Hawaiian–Emperor Bend. Such a scenario is consistent with available constraints from global plate circuits, palaeomagnetic data and geodynamic models. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	Eocene; hot spot; mantle convection; mantle plume; Paleocene; plate tectonics; subduction; Brazil; Mariana; Minas Gerais; Pacific Ocean
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250811
作者单位	Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; Mathematics and Computer Science Division, Argonne National Laboratory, Lemont, IL, United States; Courant Institute of Mathematical Sciences, New York University, New York, NY, United States; School of Geosciences, The University of Sydney, Sydney, NSW, Australia
推荐引用方式 GB/T 7714	Hu J.,Gurnis M.,Rudi J.,et al. Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago[J],2022,15(1).
APA	Hu J.,Gurnis M.,Rudi J.,Stadler G.,&Müller R.D..(2022).Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago.Nature Geoscience,15(1).
MLA	Hu J.,et al."Dynamics of the abrupt change in Pacific Plate motion around 50 million years ago".Nature Geoscience 15.1(2022).