Estratigrafía del Mioceno en el sector suoriental de la Cuenca de Almazán (Zaragoza)
- M.J. Varas Muriel 1
- P. Barba 2
- I. Armenteros 2
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1
Instituto de Recursos Naturales y Agrobiología de Salamanca
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Instituto de Recursos Naturales y Agrobiología de Salamanca
Salamanca, España
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2
Universidad de Salamanca
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ISSN: 0214-2708
Datum der Publikation: 1999
Titel der Ausgabe: Trabajos presentados en el Second Congress R.C.A.N.S., Salamanca 1997
Ausgabe: 12
Nummer: 1
Seiten: 63-76
Art: Artikel
Andere Publikationen in: Revista de la Sociedad Geológica de España
Zusammenfassung
The Miocene (lower Agenian-Vallesian?) sedimentary infilling of the southeastern 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 of the eastern 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.