78329 20200117221640.0 doi 10.1016/j.sedgeo.2018.01.008 sideral 105411 ART-2018-105411 eng (orcid)0000-0002-1304-2264 Sancho, C. Universidad de Zaragoza Glaciolacustrine deposits formed in an ice-dammed tributary valley in the south-central Pyrenees: New evidence for late Pleistocene climate 2018 Access copy available to the general public Unrestricted Combined geomorphic features, stratigraphic characteristics and sedimentologic interpretation, coupled with optically stimulated luminescence (OSL) dates, of a glacio-fluvio-lacustrine sequence (Linás de Broto, northern Spain) provide new information to understand the palaeoenvironmental significance of dynamics of glacier systems in the south-central Pyrenees during the Last Glacial Cycle (˜130 ka to 14 ka). The Linás de Broto depositional system consisted of a proglacial lake fed primarily by meltwater streams emanating from the small Sorrosal glacier and dammed by a lateral moraine of the Ara trunk glacier. The resulting glacio-fluvio-lacustrine sequence, around 55 m thick, is divided into five lithological units consisting of braided fluvial (gravel deposits), lake margin (gravel and sand deltaic deposits) and distal lake (silt and clay laminites) facies associations. Evolution of the depositional environment reflects three phases of progradation of a high-energy braided fluvial system separated by two phases of rapid expansion of the lake. Fluvial progradation occurred during short periods of ice melting. Lake expansion concurred with ice-dam growth of the trunk glacier. The first lake expansion occurred over a time range between 55 ± 9 ka and 49 ± 11 ka, and is consistent with the age of the Viu lateral moraine (49 ± 8 ka), which marks the maximum areal extent of the Ara glacier during the Last Glacial Cycle. These dates confirm that the maximum areal extent of the glacier occurred during Marine Isotope Stages 4 and 3 in the south-central Pyrenees, thus before the Last Glacial Maximum. The evolution of the Linás de Broto depositional system during this maximum glacier extent was modulated by climate oscillations in the northern Iberian Peninsula, probably related to latitudinal shifts of the atmospheric circulation in the southern North-Atlantic Ocean, and variations in summer insolation intensity. info:eu-repo/grantAgreement/ES/DGA/E28 info:eu-repo/grantAgreement/ES/DGA/E68 info:eu-repo/grantAgreement/ES/DGA/FSE info:eu-repo/grantAgreement/ES/DGA/S97-PALEOQ info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 3.244 2018 GEOLOGY 4 / 46 = 0.087 2018 Q1 T1 1.317 2018 Stratigraphy 2018 Q1 Geology 2018 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0002-4212-0524 Arenas, C. Universidad de Zaragoza (orcid)0000-0001-6082-5301 Pardo, G. (orcid)0000-0003-4067-8222 Peña-Monné, J.L. Universidad de Zaragoza Rhodes, E.J. Bartolomé, M. García-Ruiz, J.M. Martí-Bono, C. 3006 430 Universidad de Zaragoza Dpto. Geograf. Ordenac.Territ. Área Geografía Física 2000 427 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Geodinámica Externa 2000 280 Universidad de Zaragoza Dpto. Ciencias de la Tierra Área Estratigrafía 366 (2018), 47-66 Sediment. geol. Sedimentary Geology 0037-0738 1880534 http://zaguan.unizar.es/record/78329/files/texto_completo.pdf Postprint 56797 http://zaguan.unizar.es/record/78329/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:78329 articulos driver 2020-01-17-22:04:02 ARTICLE