It is concluded that sediment deposition was mainly forced by sediment supply from ploughing areas.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.Thermoluminescence was first clearly described in a paper presented to the Royal Society (of Britain) in 1663, by Robert Boyle, who described the effect in a diamond which had been warmed to body temperature.

dating osl-88

Electrons from these substances get trapped in the mineral's crystalline structure, and continuing exposure of the rocks to these elements over time leads to predictable increases in the number of electrons caught in the matrices.

But when the rock is exposed to high enough levels of heat or light, that exposure causes vibrations in the mineral lattices and the trapped electrons are freed.

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).

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.

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.

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.

From this data a complex deposition and incision history is constructed for the last 500 years.

The channel incised during this period was later partly filled with sediment.