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Lacustrine Neogene systems of the Duero Basin: evolution and controls

Mediavilla López, Rosa María and Dabrio, Cristino J. and Martín Serrano, Ángel and Santisteban , Juan I. (1996) Lacustrine Neogene systems of the Duero Basin: evolution and controls. In Tertiary basins of Spain : the stratigraphic record of crustal kinematics. World and regional geology series (6). Cambridge University Press, Cambridge ; New York, pp. 228-236. ISBN 0521461715

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Abstract

Vertical aggradation of Neogene fluvial and lacustrine
deposits occurred until the Late Neogene in central and northem
areas of the Duero Basin, coeval with river incision in the southwestern corner
of the basin. The whole basin became exorheic in the
Latest Neogene. We have differentiated five tectonosedimentary
units (TSUs) of basinal extent, bounded by unconfonnities or
breaks in the sedimentary record. Deposits in each TSU consist of
alluvial-fan deposits in areas close to the active northern and
eastern margins, and fluvial deposits along the western margin.
These systems converged in the lower, subsiding areas of the basin
occupied by carbonate-evaporite lacustrine systems.
Tectonics and climate controlled sedimentation. The main faults
active from the Neogene to the Present reflect Late Hercynian
basement fractures that were re-activated during the Alpine Orogeny,
both fracturing blocks and modifying landscapes, and creating
or modifying the areas of subsidence. Analysis of climatic
variations during the Miocene shows that deposition of saline
materials occurred in dry TSUs (1, 2) and, particularly, in humid
TSUs (3,4). Climate does not seem to have been a determining
factor for the formation of evaporites. However, it was a very
important factor in determining both the amount of water that
reached the basin and, eventually, also the extent of the lacustrine
systems.

Item Type:Book Section
Uncontrolled Keywords:Duero Basins; Neogene; Lacustrine deposits
Subjects:Sciences > Geology > Stratigraphic geology
ID Code:12548
Deposited On:07 Apr 2011 11:46
Last Modified:06 Feb 2014 09:27

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