Encontrados 4 documentos, a visualizar página 1 de 1
Kinematic interpretation of shearband boudins : new parameters and ratios usefu...
Pamplona, J.; Rodrigues, Benedito C.Shearband boudins (asymmetric boudins showing slip along the inter-boudin surface, which is synthetic with respect to the bulk shear sense) are ubiquitous and well-exposed in HT simple shear zones. The present work aims to extend the methodology of analysis of shearband boudins developed by Goscombe and Passchier (2003). Such shearband boudins represent complex objects that require an adequate methodology for u...
Microstructural analysis of shearband boudin - preliminary results
Rodrigues, Benedito C.; Peternell, Mark; Moura, António; Pamplona, J.The internal structure of a shearband boudin resulting from an original igneous, hydrothermal or metamorphic segregation tabular rigid body is a subject of scientific interest. It allows understanding the deformation mechanisms acting on homogeneous quartz aggregate activated during simple shear progressive deformation. This communication is focused on the characterization of two main structural aspects: (i) th...
Application of shearband boudins analysis to understand ductile shear zones
Sousa, João P.; Rodrigues, Benedito C.; Pamplona, J.The methodology used for the kinematic analysis of H-T ductile shear zones based on geometric analysis of boudins, proved to be a easy application tool. The boudin analysis begans with the measurement of the Lb (boudin axis) orientation, as a fundamental element of the kinematic analysis in simple shear – Lb proved always to be perpendicular to a local displacement plane (Sx) that is defined as the plane that c...
Fold boudins : what is that?
Pamplona, J.; Rodrigues, Benedito C.The hypothesis proposed in this work is related with the genesis and evolution, in HT simple shear zones, of a new conceptual structure designed by fold boudin. The field evidences, achieved in the scope of a methodology to analyze the kinematics of shearband boudins (Pamplona & Rodrigues, 2011), are the basis to show how folds evolute until reach a shearband boudin final state. The critical mass factor (Mc) is...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||