DOI: 10.1002/grl.50417
论文题名: Tectonic overpressure in weak crustal-scale shear zones and implications for the exhumation of high-pressure rocks
作者: Schmalholz S.M. ; Podladchikov Y.Y.
刊名: Geophysical Research Letters
ISSN: 0094-9054
EISSN: 1944-8785
出版年: 2013
卷: 40, 期: 10 起始页码: 1984
结束页码: 1988
语种: 英语
英文关键词: numerical modelling
; shear zone
; tectonic overpressure
Scopus关键词: Crustal-scale shear zones
; High-pressure rocks
; Lithospheric deformation
; Lithostatic pressure
; Overpressure
; Shear zone
; Thermo-mechanical coupling
; Two-dimensional numerical simulation
; Computer simulation
; Geodynamics
; Numerical models
; Tectonics
; crustal structure
; geodynamics
; high pressure
; lithosphere
; numerical model
; rock
; shear zone
; tectonic structure
; temperature effect
; two-dimensional modeling
; viscosity
英文摘要: A two-dimensional numerical simulation of lithospheric shortening shows the formation of a stable crustal-scale shear zone due to viscous heating. The shear zone thickness is controlled by thermomechanical coupling that is resolved numerically inside the shear zone. Away from the shear zone, lithospheric deformation is dominated by pure shear, and tectonic overpressure (i.e., pressure larger than the lithostatic pressure) is proportional to the deviatoric stress. Inside the shear zone, deformation is dominated by simple shear, and the deviatoric stress decreases due to thermal weakening of the viscosity. To maintain a constant horizontal total stress across the weak shear zone (i.e., horizontal force balance), the pressure in the shear zone increases to compensate the decrease of the deviatoric stress. Tectonic overpressure in the weak shear zone can be significantly larger than the deviatoric stress at the same location. Implications for the geodynamic history of tectonic nappes including high-pressure/ultrahigh-pressure rocks are discussed. © 2013 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879926429&doi=10.1002%2fgrl.50417&partnerID=40&md5=6eddd789260a943d4014002ccada9d75
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6318
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Earth Sciences, University of Lausanne, 1015 Lausanne, Switzerland
Recommended Citation:
Schmalholz S.M.,Podladchikov Y.Y.. Tectonic overpressure in weak crustal-scale shear zones and implications for the exhumation of high-pressure rocks[J]. Geophysical Research Letters,2013-01-01,40(10).