Tres escenarios lacustres del Pleistoceno de la Cuenca de Guadix-Baza (Granada)

Resumen

Tres escenarios lacustres del Pleistoceno de la Cuenca deGuadix-Baza (Granada)J.E. Ortiz1, T. Torres1, y A. Delgado21 Laboratorio de Estratigrafía Biomolecular. E.T.S.I. Minas de Madrid. C/Ríos Rosas 21, 28003 Madrid, e-mail: jeortiz@dinge.upm.es,trino@dinge.upm.es2 Laboratorio de Isótopos Estables. Estación Experimental “El Zaidín” (CS1C). C/Profesor Albareda 1, 18008 Granada, antodel@eez.csic.esABSTRACTIn the Pleistocene Guadix-Baza lacustrine Basin, the different ostracode species are related to thehydro-geochemical characteristics (mainly salinity) of the subenvironments occurring in each particular area, whereas the d !8 0 measured in ostracode valves reflects the global climatic conditions. This lack of correspondence is due to the high sensitivity of ostracodes to a change in the environmental conditions and, furthermore because of the local characteristics, which can produce uncertainties in the palaeoenvironmental interpretation. This has been defined as the "mosaiceffect", which is described as the assembly of characteristics typical of a shallow water-body, defined by its position within the basin, materials of the catchment area, runoff and underground waterinputs, among others, that affect, in a different way, the ecology and geochemistry of nearby water-bodies. In conclusion, the palaeoenvironmental interpretation cannot only be based on a singleproxy.