%0 Journal Article
%A Santisteban Navarro, Juan Ignacio
%A Martín-Serrano García, Ángel
%T Neogene fan deltas in the northernGuadalquivir basin (Andújar, Jaén, Spain)
%D 1991
%@ 0378-102X
%U https://hdl.handle.net/20.500.14352/57041
%X The Neogene of Andújar (Guadalquivir Basin) consists of siliciclasticaud carbonate rocks of Upper Tortonian and Messinian age. They are groupedinto a laterally-related facies assemblages that form two megacycles. Ihelower of these cycles has debris-flow, proximal and distal braided-channelsand sandy plain sediments, alí them with subaerial and subaqueous features,plus marine littoral bars aud carbonate shelf deposits. Lateral arrangement offacies allow to interpret these rocks as deposited in delta settings with variablename depending on the criterion used: braided delta (McPherson et al., 1981)orfan delta (Nernec & Steel, 1988). In Postma’s (1990) proposal of classifucationthe described case-study sedimented in a shallow delta system fed by alluvialsystems. It is an intermediate between types A and B, with bed-load dominanceat the river-mouth and shoal-water profile, developed over a carbonateshelf. Sea-level fluctuations controlled the evolution of the system as deducedfrom spatial arrangement of the described rocks. This fluctuation was intum related to variations of the basin’s volume related to synsedimentarymovements along the south margin (although this is a passive margin, itlocates at the northem edge of a basin with a complex geodynamic behaviourduring Cainozoic).
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