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TitleDuctile shear zones
Author(s)Induni, Guillermo Alvarado
Vrabec, Marko
Dutta, Arindam
Gupta, Saibal
Panigrahi, M. K.
Singh, Bikramaditya
Mandal, Subhadip
Pamplona, J.
Calejo Rodrigues, Benedito
Fernández, Carlos
Editor(s)Mukherjee, Soumyajit
Couette flow
Ductile shear zone
Flanking structure
Mineral fish
Primary shear (C) plane
Pure shear
Simple shear
Synthetic secondary shear plane
Issue date15-Jun-2015
Abstract(s)Two alternative pathways to generate shearband boudins in a HT shear zone have been observed at the Salgosa outcrop field (NW of Portugal, N4642140 E524687, WGS84) – Parautochthonous of Variscan Central Iberian Zone, Silurian age –: The classical one, associated with relatively thick veins (see final geometry and explanation in Figure 2.15), and a newly proposed model of fold-boudin evolution related to relatively thin veins: The boudinage genesis starts with the folding of tabular competent bodies of different thickness immersed in a less competent matrix. The evolution of the thin bodies (low t) follows the folding process until it culminates with the coalescence and stacking of the folds (Figure 2.36 and Figure 2.37 and respective captions). By this mechanism, a critical thickness is reached and a new phase of boudinage is triggered, similar to that followed by originally thicker veins (high t) – see final geometry and explanation in Figure 2.39.
TypeBook part
Publisher version
AccessRestricted access (Author)
Appears in Collections:CIG-R - Livros, Capítulos de Livros e Artigos em Livros

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