Publication: Estratigrafía del Mioceno en el sector suroriental de la Cuenca de Almazán (Zaragoza)
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Publication Date
1999
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Sociedad Geológica de España
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Abstract
El relleno sedimentario Mioceno (Ageniense inferior-Vallesiense?) del sector suroriental de la Cuenca de Almazán está formado por dos secuencias deposicionales, definidas a partir de sendas discontinuidades basales y por cambios paleogeográficos mayores que dan lugar a una distribución
variable de los sistemas aluviales y lacustres en la región. La discontinuidad inferior representa un evento diastrófico al final del Oligoceno (Ageniense inferior) mientras que la discontinuidad que separa ambas secuencias está situada en tomo al límite Rambliense-Aragoniense. Cada secuencia
incluye un complejo de sistemas aluviales y lacustres y muestra una tendencia grano y estrato decreciente que finaliza con una retracción aluvial. La evolución sedimentaria está controlada por las pulsaciones tectónicas del borde oriental (Rama Aragonesa) y por la posición de esta parte de la cuenca en la unión de las ramas Aragonesa y Castellana del Sistema Ibérico
The Miocene (lower Agenian-Vallesian?) sedimentary infilling of the southeastem zone of the Almazán Basin consists of two depositional sequences which have been defined on the basis of basal unconformities and major paleogeographical changes. These resulted in a changing distribution of the alluvial fan and lacustrine systems throughout the area. The lower unconformity represents a diastrophic event of late Oligocene age (lower Agenian), while the discontinuity separating Lower from Upper Depositional Sequences is upper Ramblian to lower Aragonian in age. Each sequence includes a set of depositional systems consisting of alluvial and lacustrine facies associations, both of which show fining and thinning-upward trends, ending with the shrinkage of the alluvial systems. The architectural evolution of the sedimentary sequences is controlled by tectonic pulses ofthe eastem border (Aragonian Branch of the Iberian Chain) and by the location of this part of the basin in the junction between the Aragonian and Castillian Branches of the Iberian Chain
The Miocene (lower Agenian-Vallesian?) sedimentary infilling of the southeastem zone of the Almazán Basin consists of two depositional sequences which have been defined on the basis of basal unconformities and major paleogeographical changes. These resulted in a changing distribution of the alluvial fan and lacustrine systems throughout the area. The lower unconformity represents a diastrophic event of late Oligocene age (lower Agenian), while the discontinuity separating Lower from Upper Depositional Sequences is upper Ramblian to lower Aragonian in age. Each sequence includes a set of depositional systems consisting of alluvial and lacustrine facies associations, both of which show fining and thinning-upward trends, ending with the shrinkage of the alluvial systems. The architectural evolution of the sedimentary sequences is controlled by tectonic pulses ofthe eastem border (Aragonian Branch of the Iberian Chain) and by the location of this part of the basin in the junction between the Aragonian and Castillian Branches of the Iberian Chain