Optically stimulated luminescence osl dating

Différents traitements statistiques visant à extraire les doses équivalentes moyennes des distributions des doses sont comparés pour estimer l’effet de la variété du blanchiment du signal OSL antérieur au dépôt.Deux approches conduisent à des âges OSL cohérents entre eux et bien corrélés à des dates radiocarbone.Two short-lived phases of incision during the first half of the XIX century were probably caused by a decrease of sediment supply due to a decline in the frequency of heavy precipitation events.The channel incised during this period was later partly filled with sediment.Optically stimulated luminescence is a method of determining the age of burial of quartz or feldspar bearing sediments based upon principles of radiation and excitation within crystal lattices, and stems from the fact that imperfections in a crystal lattice have the ability to store ionizing energy (Radiation is absorbed by the crystal lattice upon sediment burial, and over time, excites electrons causing them to migrate within the crystal and become stored in traps resulting from crystal lattice defects.Optically stimulated luminescence (OSL) dating is used to determine the (robust) chronology of the phases of sediment deposition and incision in a headwater sub-basin of the Yzeron Basin, France.Deux brèves phases d’incision durant la première moitié du XIX siècle semblent liées à une baisse de la fourniture sédimentaire due à une diminution de la fréquence de précipitations intenses.From this data a complex deposition and incision history is constructed for the last 500 years.

Elles indiquent que tous les sédiments étudiés sont plus jeunes que 1500 ans ap. A partir de ces données une histoire complexe de phases de dépôt et d’incision est reconstituée sur les 500 dernières années.

Il apparaît que l’aggradation est principalement liée à la forte fourniture sédimentaire issue des labours.

The decline of agricultural land use from about 1915 onwards decreased sediment supply, while the increase of urbanisation from about 1950 amplified the flow energy of flooding by pluvial waters and overflows from storm basins, causing the presently ongoing incision in the area that began about AD 1975.

Des datations par OSL (Optically Stimulated Luminescence) sont utilisées pour reconstituer la chronologie de phases d’aggradation et d’incision dans un sous-bassin élémentaire du bassin de l’Yzeron (France).

Different statistical approaches to extract the mean equivalent dose from dose distributions are compared to estimate the effect of differential bleaching of the OSL signal prior to deposition.

Two approaches result in OSL ages that are internally consistent and in excellent agreement with radiocarbon dating, indicating that all investigated sediments are younger than AD 1500.

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