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|Title: ||Domino structures evolution in strike-slip shear zones|
|Authors: ||Moreira, Noel|
|Keywords: ||Domino structures|
Heterogeneous simple shear
|Issue Date: ||2018|
|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.|
|Appears in Collections:||GEO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
ICT - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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