The MIS 5 palaeoenvironmental record in the SE Mediterranean coast of the Iberian Peninsula (Río Antas, Almería, Spain)
T. Torres1, J. E. Ortiz1, A. M. Blázquez2, B. Ruiz Zapata3, M. J. Gil3, T. Martín3, and Y. Sánchez-Palencia11Laboratory of Biomolecular Stratigraphy, E.T.S.I. Minas y Energía, Universidad Politécnica de Madrid, C/ Ríos Rosas 21, Madrid 28003, Spain 2Environmental and Marine Sciences Research Institute, Catholic University of Valencia C/Guillem de Castro 94, 46003 Valencia, Spain 3Dpto. Geología, Facultad Ciencias, Universidad Alcalá de Henares, Campus Universitario, Universidad Alcalá, 28871 Alcalá de Henares, Madrid, Spain
Received: 13 Jul 2015 – Accepted for review: 12 Aug 2015 – Discussion started: 26 Aug 2015
Abstract. Landwards of a MIS5 bar, a borehole core (SRA) was analyzed to establish the relationship between the lagoonal record and the raised beach deposits in the surroundings of the Antas river mouth and to reconstruct the Pleistocene palaeoenvironmental evolution of the southern Mediterranean coast of the Iberian Peninsula. 63 samples were recovered for amino acid racemization dating, 86 samples for sedimentological and paleontological determination, 37 samples for pollen identification and 54 for biomarker analysis. AAR revealed that the borehole record contains MIS11, MIS6 and MIS5 deposits, the latter extensively represented. During the end of MIS6 and MIS5, a sand barrier developed and created a shallow lagoon with alternating terrestrial inputs this process being common in other Mediterranean realms. Litho- and biofacies allowed the identification of distinct paleoenvironments through time, with the presence of a lagoonal environment alternating with alluvial fan progradation. Biomarkers indicated constant input from terrestrial plants, together with variable development of aquatic macrophytes. The palynological content allowed the reconstruction of the paleoclimatological conditions during MIS6 and 5, with evidence of seven scenarios characterized by alternating arid and relatively humid conditions.
Torres, T., Ortiz, J. E., Blázquez, A. M., Ruiz Zapata, B., Gil, M. J., Martín, T., and Sánchez-Palencia, Y.: The MIS 5 palaeoenvironmental record in the SE Mediterranean coast of the Iberian Peninsula (Río Antas, Almería, Spain), Clim. Past Discuss., 11, 3897-3936, doi:10.5194/cpd-11-3897-2015, 2015.