DOI: 10.1002/2013GL059116
论文题名: Seismic anisotropy of the Archean crust in the Minnesota River Valley, Superior Province
作者: Ferré E.C. ; Gébelin A. ; Conder J.A. ; Christensen N. ; Wood J.D. ; Teyssier C.
刊名: Geophysical Research Letters
ISSN: 0094-10330
EISSN: 1944-10061
出版年: 2014
卷: 41, 期: 5 起始页码: 1514
结束页码: 1522
语种: 英语
英文关键词: anisotropy
; Archean
; crust
; Minnesota
; SWS
; US Array
Scopus关键词: Anisotropy
; Landforms
; Shear waves
; Archean
; crust
; Minnesota
; SWS
; US Array
; Rivers
; Archean
; contraction
; crust
; crust-mantle boundary
; foliation
; gneiss
; layer
; lithosphere
; plastic flow
; river
; S-wave
; seismic anisotropy
; upper mantle
; wave splitting
; Minnesota
; Minnesota Valley
; Superior Province
; United States
英文摘要: The Minnesota River Valley (MRV) subprovince is a well-exposed example of late Archean lithosphere. Its high-grade gneisses display a subhorizontal layering, most likely extending down to the crust-mantle boundary. The strong linear fabric of the gneisses results from high-temperature plastic flow during collage-related contraction. Seismic anisotropies measured up to 1 GPa in the laboratory, and seismic anisotropies calculated through forward-modeling indicate ΔVP ~5-6% and ΔVS ~3%. The MRV crust exhibits a strong macroscopic layering and foliation, and relatively strong seismic anisotropies at the hand specimen scale. Yet the horizontal attitude of these structures precludes any substantial contribution of the MRV crust to shear wave splitting for vertically propagating shear waves such as SKS. The origin of the regionally low seismic anisotropy must lie in the upper mantle. A horizontally layered mantle underneath the United States interior could provide an explanation for the observed low SWS. Key Points The Archean crust of the Minnesota River Valley is strongly anisotropic The horizontally layered crust of the MRV cannot split vertical shear waves The cause of low SWS in the MRV must be in the uppermost mantle ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84895774903&doi=10.1002%2f2013GL059116&partnerID=40&md5=2aac5471cc477b8fcdc572de87b2f93c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7594
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geology, Southern Illinois University, Carbondale IL, United States
Recommended Citation:
Ferré E.C.,Gébelin A.,Conder J.A.,et al. Seismic anisotropy of the Archean crust in the Minnesota River Valley, Superior Province[J]. Geophysical Research Letters,2014-01-01,41(5).