The competition between folding and faulting in the upper crust based on the maximum strength theorem

Kampfer, G.; Leroy, Yves M.

doi:10.1098/rspa.2011.0392

Cited by 4 publications

(1 citation statement)

References 21 publications

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“…Consequently there have been various mechanical developments from the kinematic models described above (e.g. Kampfer & Leroy 2012;Smart et al 2012;Hughes et al 2014;Hughes & Shaw 2015). Note, however, that these mechanical models generally assume a specific kinematic evolution and are applied to a single fold-thrust structure, or a layer within it.…”

Section: Upscaling and Downscalingmentioning

confidence: 99%

Fold–thrust structures – where have all the buckles gone?

Butler

Bond

Cooper

et al. 2019

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The margins to evolving orogenic belts experience near layer-parallel contraction that can evolve into fold-thrust belts. Developing cross-section-scale understanding of these systems necessitates structural interpretation. However, over the past several decades a false distinction has arisen between some forms of so-called fault-related folding and buckle folding. We investigate the origins of this confusion and seek to develop unified approaches for interpreting fold-thrust belts that incorporate deformation arising both from the amplification of buckling instabilities and from localized shear failures (thrust faults). Discussions are illustrated using short case studies from the Bolivian Subandean chain (Incahuasi anticline), the Canadian Cordillera (Livingstone anticlinorium) and Subalpine chains of France and Switzerland. Only fault-bend folding is purely fault-related and other forms, such as fault-propagation and detachment folds, all involve components of buckling. Better integration of understanding of buckling processes, the geometries and structural evolutions that they generate may help to understand how deformation is distributed within fold-thrust belts. It may also reduce the current biases engendered by adopting a narrow range of idealized geometries when constructing cross-sections and evaluating structural evolution in these systems.

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Section: Upscaling and Downscalingmentioning

confidence: 99%

Fold–thrust structures – where have all the buckles gone?

Butler

Bond

Cooper

et al. 2019

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Tectonic and gravity extensional collapses in overpressured cohesive and frictional wedges

2015

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Two modes of extensional collapse in a cohesive and frictional wedge of arbitrary topography, finite extent, and resting on an inclined weak décollement are examined by analytical means. The first mode consists of the gravitational collapse by the action of a half-graben, rooting on the décollement and pushing seaward the frontal part of the wedge. The second mode results from the tectonics extension at the back wall with a similar half-graben kinematics and the landward sliding of the rear part of the wedge. The predictions of the maximum strength theorem, equivalent to the kinematic approach of limit analysis and based on these two collapse mechanisms, not only match exactly the solutions of the critical Coulomb wedge theory, once properly amended, but generalizes them in several aspects: wedge of finite size, composed of cohesive material and of arbitrary topography. This generalization is advantageous to progress in our understanding of many laboratory experiments and field cases. For example, it is claimed from analytical results validated by experiments that the stability transition for a cohesive, triangular wedge occurs with the activation of the maximum length of the décollement. It is shown that the details of the topography, for the particular example of the Mejillones peninsula (North Chile) is, however, responsible for the selection of a short length-scale, dynamic instability corresponding to a frontal gravitational instability. A reasonable amount of cohesion is sufficient for the pressures proposed in the literature to correspond to a stability transition and not with a dynamically unstable state.

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Mechanics of Accretionary Prisms and Fold-and-Thrust Belts Based on Limit Analysis

Leroy¹,

Maillot²

2016

Advances in Geophysics

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The competition between folding and faulting in the upper crust based on the maximum strength theorem

Cited by 4 publications

References 21 publications

Fold–thrust structures – where have all the buckles gone?

Fold–thrust structures – where have all the buckles gone?

Tectonic and gravity extensional collapses in overpressured cohesive and frictional wedges

Mechanics of Accretionary Prisms and Fold-and-Thrust Belts Based on Limit Analysis

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