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espanol: En algunos sectores de las zonas Cantabrica y Asturoccidental-leonesa se ha desarrollado un clivaje incongruente con posterioridad a los principales pliegues variscos. Para su analisis se han considerado los siguientes mecanismos: anti-flexural flow, anti-deformacion longitudinal tangencial inversa, deformacion homogenea y deformacion en las capas incompetentes por traslacion de las competentes. Los tres primeros corresponden a mecanismos de plegamiento operando en sentido inverso. En la Zona Cantabrica, el mecanismo esencial de formacion del clivaje incongruente es la deformacion homogenea con maximo acortamiento subvertical. Cuando el clivaje tiene distinta orientacion en los dos flancos, esta es probablemente debida a un plegamiento posterior, como lo indica la presencia frecuente de clivaje de crenulacion. En el caso de la Zona Asturoccidental-leonesa, el clivaje incongruente tiene siempre distinta orientacion en ambos flancos y su formacion ha sido interpretada como debida a deformacion en las capas incompetentes por traslacion de las competentes a la que se superpone una deformacion homogenea con direccion de maximo acortamiento paralela al plano axial. EnglishIn specific areas of the Cantabrian and Westasturian-Leonese zones, an oblique cleavage develops subsequently to the formation of the main Variscan folds. Several mechanisms have been considered for its analysis: anti-flexural flow, anti-tangential longitudinal strain, homogeneous strain and deformation of the incompetent layers by translation of the competent ones. The first three correspond to folding mechanisms operating in a reverse sense. In the Cantabrian Zone the main mechanism for the formation of the oblique cleavage is homogeneous strain with a subvertical maximum shortening. When the cleavage has a different orientation in both limbs, this is probably due to a subsequent folding event, as indicated by the common existence of crenulation cleavage. In the Westasturian-Leonese Zone the cleavage has always a different orientation in both limbs and its formation has been interpreted as a result of deformation of the incompetent layers by translation of the competent ones with a superposition of homogeneous strain with maximum shortening parallel to the axial plane

trabajos de geología

Mecanismos para la formación de foliaciones tectónicas superpuestas a pliegues: ejemplos en el orógeno varisco del NW de España Mechanisms for the formation of tectonic foliations superimposed on folds: examples in the Variscan orogen of NW Spain