Publication: Neogene fan deltas in the northern
Guadalquivir basin (Andújar, Jaén, Spain)
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Publication Date
1991
Authors
Martín-Serrano García, Ángel
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Universidad Complutense de Madrid. Departamento de Estratigrafía
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Abstract
The Neogene of Andújar (Guadalquivir Basin) consists of siliciclastic
aud carbonate rocks of Upper Tortonian and Messinian age. They are grouped
into a laterally-related facies assemblages that form two megacycles. Ihe
lower of these cycles has debris-flow, proximal and distal braided-channels
and sandy plain sediments, alí them with subaerial and subaqueous features,
plus marine littoral bars aud carbonate shelf deposits. Lateral arrangement of
facies allow to interpret these rocks as deposited in delta settings with variable
name depending on the criterion used: braided delta (McPherson et al., 1981)
orfan delta (Nernec & Steel, 1988). In Postma’s (1990) proposal of classifucation
the described case-study sedimented in a shallow delta system fed by alluvial
systems. It is an intermediate between types A and B, with bed-load dominance
at the river-mouth and shoal-water profile, developed over a carbonate
shelf. Sea-level fluctuations controlled the evolution of the system as deduced
from spatial arrangement of the described rocks. This fluctuation was in
tum related to variations of the basin’s volume related to synsedimentary
movements along the south margin (although this is a passive margin, it
locates at the northem edge of a basin with a complex geodynamic behaviour
during Cainozoic).