DOI: 10.1016/j.earscirev.2020.103473
论文题名: Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia
作者: Ma Q. ; Xu Y.-G.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2021
卷: 213 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166460
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Ma Q.,Xu Y.-G.. Magmatic perspective on subduction of Paleo-Pacific plate and initiation of big mantle wedge in East Asia[J]. Earth Science Reviews,2021-01-01,213