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Guadix-Baza Basin
Late Pleistocene and Holocene mid-latitude palaeoclimatic and palaeoenvironmental reconstruction: an approach based on the isotopic record from a travertine formation in the Guadix-Baza basin, Spain
Normal faulting driven by denudational isostatic rebound
THE MICROMAMMAL FAUNA FROM NEGRATÍN-1 (GUADIX BASIN, SOUTHERN SPAIN): NEW EVIDENCE OF AFRICAN-IBERIAN MAMMAL EXCHANGES DURING THE LATE MIOCENE
High-Frequency Rhythmicity in a Mixed Siliciclastic–Carbonate Shelf (Late Miocene, Guadix Basin, Spain): A Model of Interplay Between Climatic Oscillations, Subsidence, and Sediment Dispersal
Biogeochemical and Ecomorphological Inferences On Prey Selection and Resource Partitioning Among Mammalian Carnivores In An Early Pleistocene Community
Micromys Caesaris , A New Murid (Rodentia, Mammalia) from the Late Pliocene of the Guadix Basin, Southeastern Spain
The Guadix topographic depression is a Neogene-Quaternary basin located in the central sector of the Betic Cordillera at the boundary between the South Iberian margin and the Alboran domain. This topographic depression is a plateau with an average elevation of 1000 m in the northern limb of the Sierra Nevada range. The continental deposits infilling the Guadix basin span time from the late Tortonian to the Pleistocene, when a laminar calcrete developed on fine- to coarse-grained fluvial and lacustrine deposits. The drainage pattern is strongly incised (up to 200 m) below the calcrete layer. Four coeval subsamples from the top laminae of the calcrete were collected and dated by the U/Th method. The resulting date is 42.6 ± 5.6 ka, which indicates the minimum age for the cessation of active sedimentation in the Guadix basin. Using this age, we have calculated the incision and erosion rates for the late Pleistocene to present-day time span in the Arroyo de Gor, a highly incised canyon in the eastern border of the Guadix basin. The minimum incision rates in this canyon are around 4 mm/yr. We envisage the capture of the Pliocene-Pleistocene endorheic Guadix basin by the Guadalquivir River after 42 ka as the main factor triggering the formation of the present-day eroded landscape. After the capture, the combination of climatic (wet periods), lithological (soft and loose sediments), and topographic (high average altitude) features allowed the development of the present-day entrenched drainage pattern. La depresión de Guadix es una cuenca neógeno-cuaternaria situada en el sector central de la Cordillera Bética cubriendo el contacto entre el Margen Sudibérico y el Dominio de Alborán. Esta depresión topográfica es, sin embargo, una superficie elevada (sobre unos 1000 m) desarrollada en el flanco N de Sierra Nevada. El relleno continental de la cuenca de Guadix abarca desde el Tortoniense superior al Pleistoceno, y está coronado por una calcreta laminar que se desarrolló sobre materiales detríticos lacustres y fluviales. La red de drenaje está fuertemente encajada (hasta 200 m) bajo este nivel de calcretas. Se han datado, mediante el método de U/Th, cuatro submuestras correspondientes a las facies laminares situadas en el techo del nivel de calcretas más alto. El resultado de la datación de la calcreta es 42.6 ± 5.6 ka, que puede interpretarse como la edad mínima para el final de la sedimentación activa en la cuenca de Guadix. Usando esta edad como referencia, hemos calculado las tasas de incisión y erosión desde el Pleistoceno superior en el Arroyo de Gor, un cañón fuerte-mente encajado en el borde oriental de la cuenca de Guadix. Las tasas de incisión en este cañón están alrededor de 4 mm/año. Consideramos que la captura Pliocena-Pleistocena (post–42 ka) de la cuenca, con carácter endorreico en ese momento, por parte del río Guadalquivir es el principal factor desencadenante del actual relieve erosivo que presenta la cuenca de Guadix. Tras la captura, la combinación de factores climáticos (periodos húmedos), litológicos (sedimentos detríticos con escasa cohesión) y topográficos (alta altitud media) han favorecido el encajamiento progresivo de la red de drenaje actual.