Publication: Modelos de pliegues alpinos de propagación de falla con basamento implicado en la zona norte del Sistema Central español
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Publication Date
2003
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Sociedad Geológica de España
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Abstract
Las estructuras alpinas observadas en este amplio sector del Sistema Central, corresponden a pliegues y fallas que afectan tanto a los materiales de basamento como a la cobertera meso-cenozoica. Los datos geológicos y estructurales obtenidos en los afloramientos han servido para evaluar las características de la deformación alpina en la cobertera en base a la aplicación de modelos de pliegues
asociados a fallas con basamento implicado. Las soluciones obtenidas con los modelos de Mitra y Mount (1998) y Narr y Suppe (1994) son muy semejantes y permiten evaluar la geometría de las fallas que no afloran en superficie, así como el mecanismo de formación de estas estructuras alpinas.
Las principales diferencias entre los modelos hacen referencia al tipo de deformación en el basamento,
sin que los datos de campo permitan discriminar entre ellos. Aunque las soluciones sean diferentes entre ellos, son válidas geométricamente. La estratigrafía local parece influir en la geometría final resultante de los pliegues, verificándose un desacople en las arenas en facies Utrillas cuando éstas superan los 100 metros de espesor.
Alpine structures located at the Spanish Central System northern border correspond to fold and faults involving both basement and a mesozoic-cainozoic sedimentary cover. Geological and structural field data were used to determine the main features of the alpine deformation present in the sedimentary cover by means of the application of basement-involved compressive structure models. These models were developed for different authors in areas of similar tectonic features. The solutions obtained by the different models are similar in relation to the predicted fault geometry for these structures, as well as their mechanism of formation. However, differences arise for the type of deformation induced in the basement, and field data are not enough to discriminate between the models. Local stratigraphy seems to play an important role in controlling the final fold geometry
Alpine structures located at the Spanish Central System northern border correspond to fold and faults involving both basement and a mesozoic-cainozoic sedimentary cover. Geological and structural field data were used to determine the main features of the alpine deformation present in the sedimentary cover by means of the application of basement-involved compressive structure models. These models were developed for different authors in areas of similar tectonic features. The solutions obtained by the different models are similar in relation to the predicted fault geometry for these structures, as well as their mechanism of formation. However, differences arise for the type of deformation induced in the basement, and field data are not enough to discriminate between the models. Local stratigraphy seems to play an important role in controlling the final fold geometry