DOI: 10.1002/2014GL060438
论文题名: Physics-controlled thickness of shear zones caused by viscous heating: Implications for crustal shear localization
作者: Duretz T. ; Schmalholz S.M. ; Podladchikov Y.Y. ; Yuen D.A.
刊名: Geophysical Research Letters
ISSN: 0094-9958
EISSN: 1944-9689
出版年: 2014
卷: 41, 期: 14 起始页码: 4904
结束页码: 4911
语种: 英语
英文关键词: lithosphere
; scaling law
; shear heating
; shear localization
; shear zone thickness
Scopus关键词: Activation energy
; Numerical models
; Scaling laws
; Thermal conductivity
; Initial temperatures
; lithosphere
; Shear heating
; Shear localizations
; Shear zone
; Shear zone development
; Temperature dependent
; Thermomechanical numerical model
; Heating
; crustal deformation
; ductility
; lithosphere
; parameterization
; shear zone
; temperature profile
; viscosity
; viscous flow
英文摘要: We evaluate the parameters that control the thickness of ductile shear zones that are generated by viscous heating. We employ two-dimensional thermomechanical numerical models to simulate shear zone development under compression. Results show that the shear zone thickness is essentially independent on the numerical resolution and the initial size of a weak inclusion that triggers shear localization. A simple scaling law is derived which predicts the thickness with six physical parameters: far-field stress and strain rate, thermal conductivity (both constant and temperature dependent), initial temperature, activation energy, and stress exponent. The scaling law is confirmed by numerical simulations for a wide range of parameters. For crustal deformation conditions typical temperature increase ranges between 50°C and 200°C, and the predicted thickness is between 1 km and 7 km. These thicknesses agree with natural crustal and lithospheric shear zones suggesting that shear heating is a process controlling crustal shear zone formation. © 2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84904533031&doi=10.1002%2f2014GL060438&partnerID=40&md5=7a84d8793faef03d985d83294b0fd1ab
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7222
Appears in Collections: 气候减缓与适应
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作者单位: Institut des Sciences de la Terre, Bâtiment Géopolis, Lausanne, Switzerland
Recommended Citation:
Duretz T.,Schmalholz S.M.,Podladchikov Y.Y.,et al. Physics-controlled thickness of shear zones caused by viscous heating: Implications for crustal shear localization[J]. Geophysical Research Letters,2014-01-01,41(14).