DOI: 10.1002/grl.50879
论文题名: Lithospheric fabric variations in central North America: Influence of rifting and Archean tectonic styles
作者: Frederiksen A.W. ; Deniset I. ; Ola O. ; Toni D.
刊名: Geophysical Research Letters
ISSN: 0094-8607
EISSN: 1944-8338
出版年: 2013
卷: 40, 期: 17 起始页码: 4583
结束页码: 4587
语种: 英语
英文关键词: anisotropy
; Mid-Continent Rift
; rifting
; shear wave splitting
; Superior Province
; vertical tectonics
Scopus关键词: Lithospheric fabrics
; Mid-Continent Rift
; rifting
; Shear wave splitting
; Splitting measurements
; Strong anisotropy
; Superior Province
; Tectonic process
; Anisotropy
; Shear waves
; Tomography
; Tectonics
; Archean
; lithosphere
; mantle
; rifting
; S-wave
; tectonics
; tomography
; upper mantle
; valley
; wave splitting
; Great Lakes [North America]
; Midcontinent Rift
; Minnesota
; Minnesota River
; North America
; Superior Province
; United States
英文摘要: Upper mantle fabric, as detected by shear wave splitting measurements, records lithospheric strain history that may be related to past tectonic events. We present SKS (core-refracted shear wave) splitting measurements taken around the western Great Lakes, North America: the Archean Superior Province (SP) and surroundings. We analyze 40 sites in the USA and 5 in Canada and outline a region of strong anisotropy corresponding to a high-velocity zone in tomographic models, which we dub the Western Superior Mantle Anomaly (WSMA) and interpret to represent a preserved fabric from accretion of the SP. To the southwest of the WSMA, we locate a region of rotated fast direction corresponding to a linear low-velocity feature observed by tomography and which may represent a failed branch of the Mid-Continent Rift. Further south, within the Minnesota River Valley Terrane, the split times drop to near zero, suggesting isotropic lithosphere resulting from vertical (diapiric) rather than horizontal tectonic processes. Key Points Strong consistent seismic fabric in western Superior. Fabric is rotated by effect of possible rift branch. Fabric disappears in Minnesota River Valley: vertical tectonics? ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883533896&doi=10.1002%2fgrl.50879&partnerID=40&md5=16db4d854806e5058bb81447df5ed135
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5871
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geological Sciences, University of Manitoba, 125 Dysart Rd., Winnipeg, MB R3T 2N2, Canada
Recommended Citation:
Frederiksen A.W.,Deniset I.,Ola O.,et al. Lithospheric fabric variations in central North America: Influence of rifting and Archean tectonic styles[J]. Geophysical Research Letters,2013-01-01,40(17).