DOI: 10.1007/s00531-013-0951-z
论文题名: An experimental approach to strain pattern and folding in unconfined and/or partitioned transpressional deformation
作者: Ghosh N. ; Chakra M. ; Chattopadhyay A.
刊名: International Journal of Earth Sciences
出版年: 2014
卷: 103, 期: 1 起始页码: 349
结束页码: 365
语种: 英语
英文关键词: Analogue model experiments
; Fold nucleation
; Instantaneous stretching axes (ISA)
; Particle paths
; Strain partitioning
; Transpression
Scopus关键词: analog model
; deformation mechanism
; efficiency measurement
; experimental study
; fault zone
; shear strain
; strain rate
; tectonic setting
; transpression
英文摘要: Three different series of experiments were carried out with pitch (bitumen) and/or composite pitch-plasticine models to observe the spatial and temporal changes of strain pattern and/or fold styles in a tectonic zone undergoing sinistral-sense unconfined transpression. In the first series, rectangular pitch models with circular strain markers, when subjected to vertically and laterally unconstrained transpression, showed that the circular markers deformed into ellipses with long axes (maximum instantaneous stretching axis: ISAmax) oriented <45° with the plane of simple shear at the onset of deformation. This initial angle decreased with increasing angle of convergence (α = 15°, 30°, 45° and 60°) between the boundary walls. In the second series, a longitudinally pre-cut pitch block simulated a pre-existing fault zone in the crust. Lubrication along the cut was varied to simulate varying ease of fault slip. During oblique convergence, transpressional strain was partitioned between the pre-existing cut (dominantly the simple shear component) and the pitch blocks (mostly the pure shear component). Partitioning was higher for higher lubrication and lower angle of convergence in these experiments, which envisaged interesting observations on the efficiency of natural 'partitioned transpression' systems. In series 3, folds in a thin plasticine layer placed over the pitch block initiated parallel to the long axis of the finite strain ellipse in transpression and rotated anticlockwise with increasing strain. © 2013 Springer-Verlag Berlin Heidelberg. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84893742339&doi=10.1007%2fs00531-013-0951-z&partnerID=40&md5=6aaa8e54d9990155c3cfcce62ae46afb
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70346
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Geology, University of Delhi, Delhi, 110 007, India
Recommended Citation:
Ghosh N.,Chakra M.,Chattopadhyay A.. An experimental approach to strain pattern and folding in unconfined and/or partitioned transpressional deformation[J]. International Journal of Earth Sciences,2014-01-01,103(1)