DOI: 10.1002/grl.50511
论文题名: Compressional and shear-wave velocity structure of the continent-ocean transition zone at the eastern Grand Banks, Newfoundland
作者: Eddy D.R. ; Van Avendonk H.J.A. ; Shillington D.J.
刊名: Geophysical Research Letters
ISSN: 0094-8903
EISSN: 1944-8634
出版年: 2013
卷: 40, 期: 12 起始页码: 3014
结束页码: 3020
语种: 英语
英文关键词: Continent-Ocean Transition Zone
; Extension
; Newfoundland
; Rifting
Scopus关键词: Continent-ocean transition
; Continent-ocean transition zones
; Continental break-up
; Extension
; Multi-channel seismic
; Newfoundlands
; Rifting
; Upper continental crust
; Geochronology
; Oceanography
; Seismic waves
; Seismology
; Offshore oil wells
; compression
; continental breakup
; crustal thickness
; extension
; magma
; peridotite
; rifting
; S-wave
; seismic reflection
; seismic velocity
; seismograph
; transition zone
; wave velocity
; Atlantic Ocean
; Canada
; Grand Banks
; Newfoundland
; Newfoundland and Labrador
英文摘要: The seismic structure of the continent-ocean transition (COT) at magma-poor rifted margins can explain geological processes leading to continental breakup. At the Newfoundland-Iberia rift, compressional seismic velocity (Vp) is interpreted with multichannel seismic reflections and drilling results to document continental crustal stretching and thinning, exhumation of the mantle, and incipient seafloor-spreading. However, Vp cannot uniquely constrain COT geology. We present an updated 2-D model for Vp and a new shear-wave velocity model (Vs) for SCREECH Line 2 on the Newfoundland margin using multichannel seismic reflections and coincident ocean-bottom seismometer refraction data. In shallow COT basement we find V p / Vs ratios average 1.77, which is normally too high for upper continental crust and too low for serpentinized mantle. This observation can be explained by stretching of a mafic middle and/or lower continental crust into the COT. We further support the presence of hydrated mantle peridotites at depth during rifting. Key Points Shear waves support stretched continental crust in Newfoundland rifted margin ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84880519064&doi=10.1002%2fgrl.50511&partnerID=40&md5=cbb6afbb085256e85cf7d198508629ae
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6167
Appears in Collections: 气候减缓与适应
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作者单位: University of Texas Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78754, United States
Recommended Citation:
Eddy D.R.,Van Avendonk H.J.A.,Shillington D.J.. Compressional and shear-wave velocity structure of the continent-ocean transition zone at the eastern Grand Banks, Newfoundland[J]. Geophysical Research Letters,2013-01-01,40(12).