A direct relation exists between the kinematic evolution of thrust-related folds and the 4-D distribution of the related deformational features. Templates of deformation patterns associated to thrust-related folding mechanisms have been produced by using geometrical modelling. This technique implies homogenous material and a qualitative relation among number, angle, and sense of bending. Deformation patterns produced by geometrical modelling consist of an array of deformation panels limited by either active or fixed axial surfaces. The distribution of deformational features within deformation panels is assumed to be homogeneous because mechanical properties of deforming multilayers (mechanical stratigraphy) are difficult to include in geometrical modelling. This is a major limitation when attempting to closely predict the actual distribution of deformational features in natural thrust-related anticlines. The mechanical stratigraphy exerts a first order control on deformation patterns in fault-related folds. In this contribution, we present results of hybrid cellular automata (HCA) numerical experiments designed to study the influence of the mechanical stratigraphy on the geometrical and deformational architecture of thrust-related anticlines. The evolution of fault-related structures in HCA experiments progresses in environmental conditions that closely match the natural ones. This, coupled with the implementation of complex mechanical stratigraphies, produces geometrical and deformational architectures that can be successfully compared with the natural ones. Simulated mechanical units span from massive limestones, to well bedded marly limestones, sandstones, and marls, up to clays. Bed thickness can be set to less than 1 cm. These mechanical units are combined in different ways for producing several model mechanical stratigraphies. Our experiments show that the introduction of a detailed mechanical stratigraphy into numerical modelling tools, designed to simulate the spatial distribution of folding-related deformational features, can significantly alter predictions obtained in geometrically-derived deformation panels. The concept of deformation panel retains its validity when fracture frequency comparisons in different locations along folds are made using the same mechanical unit.

Storti, F., Salvini, F., Tavani, S. (2004). Influence of the mechanical stratigraphy on deformation patterns in thrust-related folds..

Influence of the mechanical stratigraphy on deformation patterns in thrust-related folds.

STORTI, Fabrizio;SALVINI, Francesco;TAVANI, STEFANO
2004-01-01

Abstract

A direct relation exists between the kinematic evolution of thrust-related folds and the 4-D distribution of the related deformational features. Templates of deformation patterns associated to thrust-related folding mechanisms have been produced by using geometrical modelling. This technique implies homogenous material and a qualitative relation among number, angle, and sense of bending. Deformation patterns produced by geometrical modelling consist of an array of deformation panels limited by either active or fixed axial surfaces. The distribution of deformational features within deformation panels is assumed to be homogeneous because mechanical properties of deforming multilayers (mechanical stratigraphy) are difficult to include in geometrical modelling. This is a major limitation when attempting to closely predict the actual distribution of deformational features in natural thrust-related anticlines. The mechanical stratigraphy exerts a first order control on deformation patterns in fault-related folds. In this contribution, we present results of hybrid cellular automata (HCA) numerical experiments designed to study the influence of the mechanical stratigraphy on the geometrical and deformational architecture of thrust-related anticlines. The evolution of fault-related structures in HCA experiments progresses in environmental conditions that closely match the natural ones. This, coupled with the implementation of complex mechanical stratigraphies, produces geometrical and deformational architectures that can be successfully compared with the natural ones. Simulated mechanical units span from massive limestones, to well bedded marly limestones, sandstones, and marls, up to clays. Bed thickness can be set to less than 1 cm. These mechanical units are combined in different ways for producing several model mechanical stratigraphies. Our experiments show that the introduction of a detailed mechanical stratigraphy into numerical modelling tools, designed to simulate the spatial distribution of folding-related deformational features, can significantly alter predictions obtained in geometrically-derived deformation panels. The concept of deformation panel retains its validity when fracture frequency comparisons in different locations along folds are made using the same mechanical unit.
2004
Storti, F., Salvini, F., Tavani, S. (2004). Influence of the mechanical stratigraphy on deformation patterns in thrust-related folds..
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/272681
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