DOI: 10.1016/j.epsl.2020.116276
论文题名: How the energy budget scales from the laboratory to the crust in accretionary wedges
作者: McBeck J. ; Cooke M. ; Renard F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 541 语种: 英语
中文关键词: accretionary prisms
; energy budget
; physical analog experiments
; scaling
英文关键词: Faulting
; Friction
; Laboratories
; Numerical models
; Stiffness
; Topography
; Accretionary prism
; Accretionary wedge
; Laboratory simulation
; Mechanical energies
; Orders of magnitude
; Remaining energies
; Scaling properties
; Slip weakening distance
; Budget control
; accretionary prism
; computer simulation
; crustal deformation
; crustal structure
; deformation mechanism
; energy budget
; experimental study
; laboratory method
; numerical model
; power law
; sand
; stiffness
; thrust fault
英文摘要: We investigate the scaling properties of the mechanical energy budget in accretionary prisms across five orders of magnitude, from the laboratory centimeter-scale to crustal kilometer-scale. We first develop numerical models that match the length scale, fault and material properties, surface topography, and fault geometries observed in scaled dry sand accretionary experiments. As we systematically increase the spatial dimensions of the numerical models by orders of magnitude, we calculate each component of the energy budget both before and after the first thrust fault pair develops. The increase of both the bulk stiffness and slip weakening distance from the laboratory- to crustal-scale produces a scale-invariant partitioning of the energy budget, relative to the total work done on the system. The components scale as power laws with exponents of three. Consequently, accurate laboratory simulations of the energetics of deformation within crustal accretionary wedges require careful scaling of the stiffness and slip weakening distance. Preceding thrust fault development at both the laboratory and crustal scale, the internal work consumes the largest portion of the budget (67-77%) and frictional work consumes the next largest portion (17-27%). Following thrusting, frictional work and internal work consume similar portions of the energy budget (38-50%). The sum of the remaining energy budget components, including gravitational work, seismic work, and the work of fracture propagation, consume <10-15% of the total energy budget preceding and following thrust fault development. © 2020 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165153
Appears in Collections: 气候变化与战略
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作者单位: Physics of Geological Processes, The Njord Centre, Department of Geosciences, University of Oslo, Norway; Department of Geosciences, University of Massachusetts AmherstMA, United States; University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France
Recommended Citation:
McBeck J.,Cooke M.,Renard F.. How the energy budget scales from the laboratory to the crust in accretionary wedges[J]. Earth and Planetary Science Letters,2020-01-01,541