El Cenozoico de la depresión del Guadiana en Badajoz. Nueva síntesis y propuesta de correlación
- G. Garzón 1
- M.J. Pellicer 1
- M. Tsige 1
- R. Tejero 1
- A. Brum 2
- J. Cabral 2
- R. Babín 1
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1
Universidad Complutense de Madrid
info
- 2 Faculdade Ciencias de Lisboa e LATTEX
ISSN: 1576-5172
Ano de publicación: 2012
Título do exemplar: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Número: 13
Páxinas: 222-225
Tipo: Artigo
Outras publicacións en: Geotemas (Madrid)
Resumo
Tertiary basins of the Southern Iberian Massif lack coherent chronological allocation given their mutual disconnection and the absence of age data. The Guadiana basin is a complex basin divided in two sub-basins by successive tectonic phases. This work pursues their integration and synthesis within a morphotectonic frame, establishing some criteria of correlation and interpretation between both subbasins within their geological (Iberian) context. Two depositional sequences are defined. They are bound by a regional unconformity and display a distinctive unit between them, characterized by carbonate duricrusts rich in paligorskite. This unit can be used as a reference criterion not only between the two sub-basins but also for others nearby. Nevertheless, it poses some identification problems due to its local convergence with a lacustrine limestone unit located at the top of the Upper Sequence. According to the facies, duricrusts and phyllosilicates, a correlation with other Iberian Massif basins may be established. Bases on it, we attribute the base of the Upper Sequence to an Eocene-Oligocene age. This would mean that the Lower Sequence corresponds to the Lower-Middle Paleogene.