Publication: Análisis de la fracturación en materiales recientes
(Mioceno superior-Cuaternario) en el Prebético Externo de Albacete
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2001
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Instituto Geológico y Minero de España
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Abstract
La zona estudiada se sitúa en el Prebético de Albacete y corresponde a la zona de transferencia norte del Arco Estructural Cazorla-Alcaraz-Hellín. El estudio de la fracturación se ha centrado fundamentalmente en los materiales de las cuencas lacustres del Mioceno superior, que se desarrollan dentro de esta banda de transferencia, y en los materiales cuaternarios en los que se han observado deformaciones. Las medidas tomadas en el campo constan de un total de 610 datos de pares falla-estría repartidos en 23 estaciones. El campo de esfuerzos reciente (Mioceno superior-Cuaternario), se ha calculado mediante diferentes técnicas de análisis poblacional de fallas (Modelo de Deslizamiento, Diedros Rectos, Método de Inversión de Esfuerzos y Método de Delvaux) para poder contrastar la solución. Las soluciones obtenidas presentan dos direcciones medias de máximo esfuerzo en la horizontal (sHMAX), NO-SE y NE-SO. Estas dos direcciones están definidas esencialmente por fallas normales, debido a que los datos se han medido en su mayoría dentro de cuencas extensivas. La primera es la que estructura la zona con el emplazamiento del Arco Estructural Cazorla-Alcaraz-Hellín y la segunda es la responsable de la génesis de las cuencas lacustres (limitadas por fallas normales E-O). Estos dos campos de esfuerzo son simultáneos y generados por una flexura cortical E-O, para toda la Cordillera Bética.
The studied area is located in the Albacete Prebetic Zone and corresponds to the north transfer zone of the Cazorla-Alcaraz-Hellín Structural Arch. Fracturing study has been carry out fundamentally in deformed rocks from the Late Miocene lacustrine basins and Quaternary inside this transfer zone. A total number of 610 couples fault slickenside lineations has been measured in 23 sites. Recent stress field (Late Miocene-Quaternary) has been calculated by means of several fault population analysis methods (Slip Model, Right Dihedral, Stress Inversion Method and Delvaux´s Method), to check the solution. The inferred solutions show two orientations of maximum horizontal stress (sHMAX), NW-SE and NE-SW. These orientations are defined mainly by normal faults, because most of the data has been taken inside extensive basins. The first one (NW-SE) is related to the build-up of the Cazorla-Alcaraz-Hellín Structural Arch and the second one is linked to the genesis of the lacustrine basins (limited by E-W normal faults). These stress fields are simultaneous and generated by Betic Chain E-W flexural bending.
The studied area is located in the Albacete Prebetic Zone and corresponds to the north transfer zone of the Cazorla-Alcaraz-Hellín Structural Arch. Fracturing study has been carry out fundamentally in deformed rocks from the Late Miocene lacustrine basins and Quaternary inside this transfer zone. A total number of 610 couples fault slickenside lineations has been measured in 23 sites. Recent stress field (Late Miocene-Quaternary) has been calculated by means of several fault population analysis methods (Slip Model, Right Dihedral, Stress Inversion Method and Delvaux´s Method), to check the solution. The inferred solutions show two orientations of maximum horizontal stress (sHMAX), NW-SE and NE-SW. These orientations are defined mainly by normal faults, because most of the data has been taken inside extensive basins. The first one (NW-SE) is related to the build-up of the Cazorla-Alcaraz-Hellín Structural Arch and the second one is linked to the genesis of the lacustrine basins (limited by E-W normal faults). These stress fields are simultaneous and generated by Betic Chain E-W flexural bending.