气候变化领域集成服务门户(CCPortal): Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia

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DOI	10.1016/j.earscirev.2020.103473
	Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia
	Ma Q.; Xu Y.-G.
发表日期	2021
ISSN	00128252
卷号	213
英文摘要	Eastern China provides a precious opportunity to explore how subduction drives evolution of the overlying continental lithosphere and to understand the fate of subducted plates. In this study, a synthesis of geochronological, whole-rock geochemical and zircon Hf isotopic data is used to examine temporal and spatial variations in distribution, composition and generation of Mesozoic magmas in the northern North China Craton. A compilation of age data reveals over 1000 km of inland-ward migration of a magmatic belt during 185– 145 Ma and then back again after 145– 140 Ma, coincident with the transition from contractional to extensional deformation regime in the very early Cretaceous. Distinct trends in lithologies, geochemistry and Nd[sbnd]Hf isotopes as a function of age and location are also observed in these magmas. The Mesozoic magmatism and deformation, as well as the lithospheric destruction, across the northern North China Craton is interpreted as the consequence of a change in subduction geodynamic regime of the Paleo-Pacific slab and its interaction with overlying continental lithosphere, which involves an active continental arc at Korean and Liaodong Peninsulas in the early-middle Jurassic, progressive shallowing of the subducting Paleo-Pacific plate in the middle-late Jurassic, and subsequent slab rollback in the early Cretaceous. Considering that trench retreat and slab-roll back are demonstrated as the pre-request of slab stagnation in the mantle transition zone, we further propose that the big mantle wedge structure in East Asia was probably initiated at 145– 140 Ma and was likely fully developed by ~120 Ma. Such a peculiar deep mantle structure governed the post-Cretaceous evolution of the Asian continental lithosphere by mediating the chemical and physical properties of upper mantle. © 2020 Elsevier B.V.
关键词	Big mantle wedge East Asia Initiation time Magmatic migration Paleo-Pacific plate
英文关键词	continental arc; continental lithosphere; deformation; geodynamics; magmatism; Pacific plate; subduction zone; transition zone; upper mantle; China; Korea; Liaodong Peninsula; Liaoning; North China Block
语种	英语
来源期刊	Earth Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/204091
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, 510640, China
推荐引用方式 GB/T 7714	Ma Q.,Xu Y.-G.. Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia[J],2021,213.
APA	Ma Q.,&Xu Y.-G..(2021).Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia.Earth Science Reviews,213.
MLA	Ma Q.,et al."Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia".Earth Science Reviews 213(2021).