Please use this identifier to cite or link to this item: http://hdl.handle.net/10174/27237

Title: Domino structures evolution in strike-slip shear zones
Authors: Moreira, Noel
Dias, Rui
Keywords: Domino structures
Brittle-ductile deformation
Heterogeneous simple shear
Cataclastic flow
Iberian Variscides
Issue Date: 2018
Publisher: Elsevier
Citation: Moreira, N., Dias, R., (2018). Domino structures evolution in strike-slip shear zones; the importance of the cataclastic flow. Jour. Struct. Geol., 110, 187–201;
Abstract: The Porto-Tomar-Ferreira do Alentejo dextral Shear Zone is one of the most important structures of the Iberian Variscides. In its vicinity, close to Abrantes (Central Portugal), a localized heterogeneous strain pattern developed in a decimetric metamorphic siliceous multilayer. This complex pattern was induced by the D2 dextral shearing of the early S0//S1 foliation in brittle-ductile conditions, giving rise to three main shear zone families. One of these families, with antithetic kinematics, delimits blocks with rigid clockwise rotation surrounded by coeval cataclasites, generating a local domino structure. The proposed geometrical and kinematic analysis, coupled with statistical studies, highlights the relation between subsidiary shear zones and the main shear zone. Despite the heterogeneous strain pattern, a quantitative approach of finite strain was applied based on the restoration of the initial fracture pattern. This approach shows the importance of the cataclastic flow coupled with the translational displacement of the domino domain in solving space problems related to the rigid block rotation. Such processes are key in allowing the rigid block rotation inside shear zones whenever the simple shear component is a fundamental mechanism.
URI: http://hdl.handle.net/10174/27237
Type: article
Appears in Collections:ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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