Lacustrine Neogene systems of the Duero Basin: evolution and controls



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Mediavilla López, Rosa María and Dabrio, Cristino J. and Martín Serrano, Ángel and Santisteban Navarro, Juan Ignacio (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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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:11 Dec 2018 08:42

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