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Distribución y características de los depósitos fluviales pleistocenos del subsuelo de la Bahía de Cádiz

Mediavilla López, Rosa María and Antón López, Loreto and Dabrio, Cristino J. and Perucha , M.A. and Santisteban, Juan I. and Mediato Arribas, José F. and Barnolas Cortina, A. and Llave, E. (2004) Distribución y características de los depósitos fluviales pleistocenos del subsuelo de la Bahía de Cádiz. Geotemas, 6 (5). pp. 203-206. ISSN 1576-5172

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Abstract

Middle to Upper Pleistocene fluvial sediments of the Cádiz Bay occur fifling partly two disconnected
sub-basins excavated into shallow marine deposits of Pliocene to Lower Pleistocene age,
and are buried under fluvial and estuarine Hofocene deposits. Subsurface, drill cores, and surface
informatio indicate that the area of the Bay was occupied by a more or less continuous basin
during the Late Pliocene-Lower Pleistocene, but the pattern changed during Middle to Late Pleistocene
as revealed by facies analysis and palaeogeographical reconstruction of the fluvial environments.
Fluvial deposits are laterally discontinuous, with variable rhickness and elongated
troughs occupied by the coarsest sediments available. Our paleogeographical reconstruction for
this periad shows a landscape with two subaerial sub-basins that acted as Fluvial valleys during glacially-forced lowstands, with two main Fluvial systems flowing constrained by topographical highs.
This configurarion records the coincidence of very low sea level (regressive conditions) during glacial
periods and active neotectonics. The valleys were flooded during the postglacial Holocene
transgression and sea level surpassed the elevations separating the former valleys leading to the
apparently simple configuration of the bay.


Item Type:Article
Uncontrolled Keywords:Cádiz Bay, Pleistocene, Fluvial deposits, Basin configuration, Neotectonics
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:10650
Deposited On:17 May 2010 09:09
Last Modified:07 Dec 2011 12:19

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