Evolución de las deformaciones alpinas en
el borde suroriental del Sistema Central Español
(Zona de Tamajón, Guadalajara)
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1993
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Instituto Geológico y Minero de España (Madrid)
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Abstract
Los resultados del análisis estructural y del análisis de fallas (métodos de los diedros rectos Etchecopar, y modelo de deslizamiento), en el borde suroriental del Sistema Central Español, permiten establecer la siguiente sucesión de eventos deformativos: una primera etapa compresiva, con escasa incidencia macroestructural, que responde a una dirección de compresión N 55º-70º E, relacionada con la estructuración de la Cordillera Ibérica; una segunda etapa compresiva, con dirección de compresión próxima a N 150º E, durante la cual se originan las principales macroestructuras de la región (cabalgamientos de dirección ENE-OSO y desgarres N 10º-20º E y N 130º-140º E); y una última etapa, de carácter extensional, con extensión máxima según E-O, con la que se asocia la fracturación que controla el depósito de las series miocenas. Se ha encontrado una notable concordancia entre los resultados obtenidos con los diferentes métodos de análisis poblacional de fallas.
In this paper, several methods of structural analysis and populational fault analysis have been used in order to stablish the main Alpine deformation events in the South-east part of the Spanish Central System. The Alpine evolution shows a first compressional event with maximum shortening in N 55º-70º E and without macrostructures. A second one has maximum shortening direction around N 150º E, with N 60º-80º E thrusts and N 10º·20º E and N 130º-140º E strike-slip faults related. The main Alpine structures in this area were developed during this event. The last one has an extensional character, with E-W maximum extension trend. The Miocene sedimentation has been probabily controlled by the faults developed during this deformation (N 10º-20º E and N 10º-20º W). The shortening and strechting directions deduced from the different analysis methods shown a good agreement between them.
In this paper, several methods of structural analysis and populational fault analysis have been used in order to stablish the main Alpine deformation events in the South-east part of the Spanish Central System. The Alpine evolution shows a first compressional event with maximum shortening in N 55º-70º E and without macrostructures. A second one has maximum shortening direction around N 150º E, with N 60º-80º E thrusts and N 10º·20º E and N 130º-140º E strike-slip faults related. The main Alpine structures in this area were developed during this event. The last one has an extensional character, with E-W maximum extension trend. The Miocene sedimentation has been probabily controlled by the faults developed during this deformation (N 10º-20º E and N 10º-20º W). The shortening and strechting directions deduced from the different analysis methods shown a good agreement between them.