DOI: 10.1016/j.tecto.2021.228779
论文题名: Assessing the brittle crust thickness from strike-slip fault segments on Earth, Mars and Icy moons
作者: Donzé F.-V. ; Klinger Y. ; Bonilla-Sierra V. ; Duriez J. ; Jiao L. ; Scholtès L.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 805 语种: 英语
中文关键词: Brittle crust thickness
; Discrete element model
; En-echelon structures
; Icy moons
; Mars
; Strike-slip faults
英文关键词: Strike-slip faults
; Brittle behavior
; Brittle layers
; Discrete element modeling
; Echelon faults
; Geometrical characteristics
; Mechanical model
; Segment lengths
; Size dependency
; Fault slips
; brittle medium
; crustal thickness
; deformation
; discrete element method
; en echelon structure
; Mars
; Moon
; strike-slip fault
英文摘要: Segment lengths along major strike-slip faults exhibit a size dependency related to the brittle crust thickness. These segments result in the formation of the localized “P-shear” deformation crossing and connecting the initial Riedels structures (i.e. en-echelon fault structures) which formed during the genesis stage of the fault zone. Mechanical models show that at all scales, the geometrical characteristics of the Riedels exhibit dependency on the thickness of the brittle layer. Combining the results of our mechanical discrete element model with several analogue experiments using sand, clay and gypsum, we have formulated a relationship between the orientation and spacing of Riedels and the thickness of the brittle layer. From this relationship, we derive that for a pure strike-slip mode, the maximum spacing between the Riedels is close to three times the thickness of the layer. For a transtensional mode, as the extensive component becomes predominant, the spacing distance at the surface becomes much smaller than the thickness. Applying this relationship to several well-characterized strike-slip faults on Earth, we show that the predicted brittle thickness is consistent with the seismogenic depth. Supposing the ubiquity of this phenomenon, we extented this relationship to characterize en-echelon structures observed on Mars, in the Memnonia region located West of Tharsis. Assuming that the outer ice shells of Ganymede, Enceladus and Europa, exhibit a brittle behavior, we suggest values of the corresponding apparent brittle thicknesses. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170797
Appears in Collections: 气候变化与战略
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作者单位: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, IFSTTAR, ISTerre, Grenoble, 38000, France; Institut de Physique du Globe de Paris, Sorbonne Paris Cite, Université Paris Diderot, UMR 7154, CNRS, Paris, France; Inrae, UR RECOVER, Aix-en-Provence, F-13182, France; Univ. Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, Clermont-Ferrand, 63000, France
Recommended Citation:
Donzé F.-V.,Klinger Y.,Bonilla-Sierra V.,et al. Assessing the brittle crust thickness from strike-slip fault segments on Earth, Mars and Icy moons[J]. Tectonophysics,2021-01-01,805