Ciclos de aridez durante los periodos de deglaciación e interglaciar en el tránsito Pleistoceno medio-superior. Tobas calcáreas del Cañón del Trabaque (Cuenca)
- David Domínguez-Villar 1
- J. Vázquez-Navarro 2
- Sonja Lojen 3
- I.J. Fairchild 4
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1
Centro Nacional de Investigación sobre la Evolución Humana
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Centro Nacional de Investigación sobre la Evolución Humana
Burgos, España
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2
Universidad Autónoma de Madrid
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- 3 Institute Jožef Stefan, Slovenia
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4
University of Birmingham
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ISSN: 1576-5172
Any de publicació: 2012
Títol de l'exemplar: VIII Congreso Geológico de España, Oviedo, 17-19 de julio, 2012.
Número: 13
Pàgines: 691-694
Tipus: Article
Altres publicacions en: Geotemas (Madrid)
Resum
We present the record of a section of freshwater tufa carbonates from the canyon of the Trabaque River, in Cuenca province. The 12 m long sequence resulted to be 20 ka in duration (~142-122 ka), which includes the deglacial and the interglacial periods corresponding to the middle-late Pleistocene boundary. Three independent proxies were analyzed: the progradation of the slope deposit in relation to the fluvial sediments of the floor of the canyon, oxygen stable isotopes and the sandy non carbonate detrital fraction of the tufas. The main oscillations of the record present a clear 2.4 ka periodicity, which is more evident during the deglaciation, although it is also present during the interglacial period. The coeval record of heavier d18O values, prograding slope deposits and the increase of the non carbonate sandy detrital fraction suggest independently the recurrent occurrence of arid episodes. Possible causes for this periodicity include the solar variability and/or the self-regulation of large Northern Hemisphere glaciers.