PRELIMINARY ELECTRON SPIN RESONANCE (ESR) DATING OF ARLANZA VALLEY (NE Duero Basin, Burgos, Spain)
Knowledge of geomorphological evolution of fluvial networks in the Iberian Peninsula has considerably improved during recent years. However, the establishement of a chronological framework for these fluvial systems based on numerical data still remains a key issue. Dating methods which may be used on these sedimentary formations are limited because of lack of volcanic sediments and the old age of these deposits themselves. Electron Spin Resonance (ESR) applied on quartz grains extracted from sediments is a palaeodosimetric method suitable for dating these fluvial sediments and for the whole Quaternary period. In their NE sector, the Duero Basin has two important tributaries: Arlanzón and Arlanza rivers. These valleys are conditioned by alpine tectonic structures, rise at the Sierra de la Demanda (Iberian Range) and flow through similar deposits (Paleozoic and Mesozoic rocks, continental tertiary deposits). A regional correlation model based on geomorphological characteristics between both river valleys was elaborated. In this work, we have applied for the first time the ESR method on quartz grains extracted from sediments on several fluvial terraces of the Arlanza river. We present these first ESR results as long as a preliminary correlation between the Arlanza and the Arlanzón valley for which ESR data are already available.
D. Moreno, A. Benito-Calvo, C. Falguères, P. Voinchet, A. Pérez-González (2016) Datación preliminar por ESR de la secuencia de terrazas fluviales del valle del Arlanza (Sector NE de la Cuenca del Duero, Burgos) in Durán Valsero, J.J., Montes Santiago, M., Robador Moreno, A., Salazar Rincón, A. (eds.). Comprendiendo el relieve: del pasado al futuro. Actas de la XIV Reunión Nacional de Geomorfología, Málaga, 2016. IGME, Madrid, 765 pp.