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The Taravilla Lake and Tufa Deposits (Central Iberian Range, Spain) as paleohydrological and paleoclimatic indicators

AuthorsValero-Garcés, Blas L. ; Moreno Caballud, Ana ; Navas Izquierdo, Ana ; Navas Izquierdo, Ana ; Mata, M. Pilar; Machín Gayarre, Javier ; Delgado Huertas, Antonio ; González-Sampériz, Penélope ; Schwalb, Antje; Morellón, Mario ; Edwards, R. Lawrence
Stable isotope
Issue Date24-Mar-2008
CitationPalaeoecology 259(2-3): 136-156 (2008)
AbstractLacustrine and tufa records from Laguna de Taravilla (Iberian Range, Guadalajara province, Spain, 40º 39' N, 1º 59' W, 1100 m a.sl.) have been analyzed using sedimentological, mineralogical, geochemical and palynological techniques. A preliminary chronological framework is based on U/Th, 14C AMS, 210Pb and 137Cs dates. The lacustrine-tufa system developed in a hanged tributary valley of the Upper Tajo River and it is composed of a large perched springline tufa building, and barrage tufa dam that impounds the small Laguna de Taravilla (2.1 ha surface area, 11 m maximum water depth). The Taravilla tufa stable isotope compositions are similar to other examples in central and southern Spain and they plot in the same field of the other lowland European stream tufas. These values are coherent with the range of isotopic compositions measured in the Taravilla spring and lake water, and provide useful paleoenvironmental information. Facies analyses shows that clastic depositional processes are dominant in the Taravilla Lake. Fining upward sequences and sands and coarse silts reflect periods of increased alluvial activity of the inlet. The dominance of clastic depositional processes and the input of detrital carbonate hinder the use of lake mud stable isotopic compositions as environmental indicators. Phases of increased travertine growth occurred during the Late Pleistocene (Last Glacial to Interglacial transition from oxygen isotopic stage 6 to 5) and during the Lateglacial and Early Holocene. Although the Taravilla chronology does not allow a detail analysis of flood frequency, the reconstructed evolution is coherent with the palaeoflood history of the Tajo River for the last 2000 years, particularly with an increase during the last 500 years. The increase in flood frequency coincides with other evidences of wetter and colder climate and environmental change in Central Spain and in Europe during the Little Ice Age.
Description21 pages, 8 figures, 3 tables.-- Available online Oct 13, 2007.-- Issue title: "Lake systems: sedimentary archives of climate change and tectonics, EGU General Assembly".
Publisher version (URL)http://dx.doi.org/10.1016/j.palaeo.2007.10.004
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