DOI: 10.1002/2014GL061988
论文题名: Constraining Cretaceous subduction polarity in eastern Pacific from seismic tomography and geodynamic modeling
作者: Liu L.
刊名: Geophysical Research Letters
ISSN: 0094-9604
EISSN: 1944-9335
出版年: 2014
卷: 41, 期: 22 起始页码: 8029
结束页码: 8036
语种: 英语
英文关键词: Farallon subduction
; geodynamic modeling
; seismic tomography
; subduction polarity
Scopus关键词: Geodynamics
; Piles
; Plates (structural components)
; Seismic prospecting
; Seismic waves
; Seismographs
; Eastern north america
; Eastern pacific Ocean
; Farallon subduction
; Geodynamic modeling
; North american plates
; Seismic tomography
; subduction polarity
; Velocity boundary condition
; Seismology
; boundary condition
; Cretaceous
; Eocene
; geodynamics
; numerical model
; seismic tomography
; slab
; subduction zone
; Pacific Ocean
; Pacific Ocean (East)
英文摘要: Interpretation of recent mantle seismic images below the America ignited a debate on the Cretaceous subduction polarity in the eastern Pacific Ocean. The traditional view is that the massive vertical slab wall under eastern North America resulted from an eastward Farallon subduction. An alternative interpretation attributes this prominent seismic structure to a westward subduction of the North American Plate against a stationary intraoceanic trench. Here I design quantitative subduction models to test these two scenarios, using their implied plate kinematics as velocity boundary conditions. Modeling results suggest that the westward subduction scenario could not produce enough slab volume as seismic images reveal, as is due to the overall slow subduction rate (~2.5 cm/yr). The results favor the continuous eastward Farallon subduction scenario, which, with an average convergence rate of >10 cm/yr prior to the Eocene, can properly generate both the volume and the geometry of the imaged lower mantle slab pile. The eastward subduction model is also consistent with most Cretaceous geological records along the west coast of North America. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923385438&doi=10.1002%2f2014GL061988&partnerID=40&md5=e660c6e277bc3d1661fbcb995be31013
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6868
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, University of Illinois at Urbana-Champaign, Champaign, IL, United States
Recommended Citation:
Liu L.. Constraining Cretaceous subduction polarity in eastern Pacific from seismic tomography and geodynamic modeling[J]. Geophysical Research Letters,2014-01-01,41(22).