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- W3186439397 abstract "espanolLa deformacion experimental ha demostrado que la presencia de foliaciones y/o bandeados ejerce un control sobre las estructuras de deformacion (kinks, bandas de cizalla o crenulaciones), que depende de la orientacion relativa de los componentes principales de la deformacion (incremental y finita) con respecto a la anisotropia. Un comportamiento analogo ocurrio en Cap de Creus durante los cizallamientos variscos. Mientras las cizallas conforman una faja NW-SE, la orientacion de las foliaciones previas es variable. En dominios donde los ejes de deformacion instantanea (ISAs) son oblicuos a la foliacion, se genera una familia de zonas de cizalla; mientras que en dominios donde son ortogonales se genera un sistema conjugado de cizallas. Este comportamiento se analiza en Cullero, donde la foliacion previa cambia de orientaciones N-S a E-W. En unos dominios la faja milonitica forma un sistema anastomosado dextral que aisla cuerpos elongados (lozenges) de forma sigmoidal, mientras que en otros la faja esta conformada por cizallas conjugadas (dextrales y senestrales) que envuelven lozenges en forma de “millipede”. Este analisis muestra que en rocas foliadas la simetria de las estructuras no depende de la vorticidad de la deformacion sino de la orientacion relativa entre anisotropia mecanica y ejes de la deformacion. EnglishExperimental studies support the fact that foliation and/or layering controls the deformation structures (kinks, shear bands or crenulations). This control depends on the relative orientation of the principal strain axes (incremental and finite) with regard to the mechanical anisotropy. An analogous behaviour occurred in Cap de Creus during the Variscan D3 shearing event on rocks foliated by D1 and D2. The shears form a NW-SE belt, while the previous foliation trends variably. In domains where the instantaneous shortening axis (ISAs) are oblique to the foliation, only one shear zone set is developed; whereas in domains where the ISAs are orthogonal to the previous anisotropy, a conjugate system of shear zones is generated. This fact is analyzed in a specific zone (Cullero) where the previous foliation changes from N-S to E-W trends. There, in some domains the mylonitic belt is formed by a dextral anastomosed system isolating elongate bodies (lozenges) with sigmoidal shapes; whereas in other domains, the shear network is formed by conjugate shears (dextrals and sinistrals) wrapping millipede– shaped lozenges. This analysis evidences the symmetry of the structures in foliated rocks does not depend on the vorticity but on the relative orientation of mechanic anisotropy and strain axes." @default.
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- W3186439397 date "2012-01-01" @default.
- W3186439397 modified "2023-09-28" @default.
- W3186439397 title "Control of mechanical anisotropy on the initiation and development of shear zone-related lozenges: a field-based study" @default.
- W3186439397 hasPublicationYear "2012" @default.
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