Abstract
ABSTRACT Optically Stimulated Luminescence (OSL) is increasingly being used as a reliable tool for dating fluvial deposits, with special relevance in the use for recent deposits due to the lack of alternative geochronological methods. This work presents a study on the OSL characteristics of sand sediments deposited by flash floods during the last 200 years in the Guadalentín River (Southeast Spain). Two problems can be anticipated in the luminescence properties for dating such recent flood deposits. The first problem is poor bleaching due to short duration of flood-flash flows and short transport distance along the catchment headwater. Second, a geological setting dominated by carbonate bedrock limits the amount of quartz grains suitable for age dating. This study aimed to provide a preliminary analysis of luminescence diagnostic parameters of these young samples that might show an irregular OSL behavior. These preliminary OSL tests point out that further improvements such as single grain analysis may provide more accurate De values than the performed multigrain aliquots and might be the appropriated procedure for dating these flash-flood deposits.
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