DOI: 10.1002/2015GL063057
论文题名: Ridge subduction sparked reorganization of the Pacific plate-mantle system 60-50 million years ago
作者: Seton M. ; Flament N. ; Whittaker J. ; Müller R.D. ; Gurnis M. ; Bower D.J.
刊名: Geophysical Research Letters
ISSN: 0094-8868
EISSN: 1944-8599
出版年: 2015
卷: 42, 期: 6 起始页码: 1732
结束页码: 1740
语种: 英语
英文关键词: geodynamics
; Izanagi plate
; plate reorganization
; ridge subduction
Scopus关键词: Geodynamics
; Geology
; Metamorphic rocks
; Seismology
; Tectonics
; Forward modeling
; Geodynamic models
; Geophysical observations
; Plate tectonic mechanism
; Ridge subduction
; Seismic tomography
; Tectonic process
; Thermal structure
; Plates (structural components)
; geodynamics
; mantle process
; oceanic crust
; plate motion
; plate tectonics
; seismic tomography
; subduction
; Hawaii [United States]
; United States
英文摘要: A reorganization centered on the Pacific plate occurred ∼53-47million years ago. A "top-down" plate tectonic mechanism, complete subduction of the Izanagi plate, as opposed to a "bottom-up" mantle flow mechanism, has been proposed as the main driver. Verification based on marine geophysical observations is impossible as most ocean crust recording this event has been subducted. Using a forward modeling approach, which assimilates surface plate velocities and shallow thermal structure of slabs into mantle flow models, we show that complete Izanagi plate subduction and margin-wide slab detachment induced a major change in sub-Pacific mantle flow, from dominantly southward before 60Ma to north-northeastward after 50Ma. Our results agree with onshore geology, mantle tomography, and the inferred motion of the Hawaiian hot spot and are consistent with a plate tectonic process driving the rapid plate-mantle reorganization in the Pacific hemisphere between 60 and 50Ma. This reorganization is reflected in tectonic changes in the Pacific and surrounding ocean basins. Key Points Pacific Eocene reorganization was triggered by a ridge subduction event Izanagi plate subduction and slab detachment altered Pacific mantle flow Our geodynamic models agree with seismic tomography and onshore geology ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927720956&doi=10.1002%2f2015GL063057&partnerID=40&md5=e51691e4aa33ed58cb365bb97f5a8c8a
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8484
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: EarthByte Group, School of Geosciences, University of Sydney, Sydney, NSW, Australia
Recommended Citation:
Seton M.,Flament N.,Whittaker J.,et al. Ridge subduction sparked reorganization of the Pacific plate-mantle system 60-50 million years ago[J]. Geophysical Research Letters,2015-01-01,42(6).