Abstract
A very extensive sequence of Quaternary fluvial terraces composed of nine strath levels (from Qt1 to Qt9) has been recognized in the Alcanadre River valley (Ebro basin, Huesca province). New mapping, altimetric, stratigraphic, pedogenic and chronological data have been supplied. A braided fluvial sedimentary environment is deduced. The confinement of the fluvial system increases as a response to drainage incision. Pedogenic carbonate morphology reaches highest development (stage VI) with the age. Palaeomagnetic data indicate that, tentatively, the age of Qt1 is near 1000 ky and the age of Qt2 is around 780 ky. In addition, numerical ages of Qt5, Qt6 and Qt7 are 44 ± 2 ky, 19 ± 2 ky and 10 ± 1 ky respectively by using Optically Stimulated Luminescence (OSL). This Upper Pleistocene chronology matches well with the regional fluvial chronostratigraphy recorded in non-glaciated river valleys. It is correlated to cold periods MIS3, LGM and YD at global scale. In a palaeoenvironmental scenario dominated by periglacial conditions, fluvial aggradation is enhanced by high sediment supply from slopes and a seasonal behaviour of rainfalls.
Highlights
Los sistemas de terrazas fluviales constituyen interesantes archivos de la evolución del modelado y el clima durante el Cuaternario (Bridgland y Westaway, 2008; Westaway et al, 2009; Maklin et al, 2012)
A very extensive sequence of Quaternary fluvial terraces composed of nine strath levels has been recognized in the Alcanadre River valley (Ebro basin, Huesca province)
Numerical ages of Qt5, Qt6 and Qt7 are 44 ± 2 ky, 19 ± 2 ky and 10 ± 1 ky respectively by using Optically Stimulated Luminescence (OSL). This Upper Pleistocene chronology matches well with the regional fluvial chronostratigraphy recorded in non-glaciated river valleys
Summary
Los sistemas de terrazas fluviales constituyen interesantes archivos de la evolución del modelado y el clima durante el Cuaternario (Bridgland y Westaway, 2008; Westaway et al, 2009; Maklin et al, 2012). Las terrazas del río Alcanadre apenas han sido objeto de estudio, por lo que la información disponible es más bien escasa. Más al oeste en la depresión del Ebro, los sistemas aluviales pleistocenos de Bardenas Reales de Navarra han sido cronoreferenciados por Sancho et al (2008). Las terrazas del río Ebro, en el sector central de la Depresión, han sido objeto de estudios sedimentológicos, si bien existe menos información cronológica precisa (Luzón et al, 2008). Por último, Fuller et al (1998) estudian la secuencia del río Guadalope y su red de afluentes, con origen en la Cordillera Ibérica, y analizan la respuesta fluvial a las oscilaciones climáticas de los últimos 200 000 años, a partir de una amplia base de datos cronológicos obtenidos mediante OSL
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