Optical Dating of Quartz from Young Deposits: From Single-aliquot to Single-grain
"Optically Stimulated Luminescence (OSL) dating is a tool used in Quaternary Geology for assessing ages of depositional mineral grains such as quartz, feldspars and zircons. In particular, OSL showed to be exceptionally robust and reliable for dating quartz samples. OSL dating relies on the assumption that the luminescence signal of grains is fully reset to zero by sunlight exposure before deposition. If this requirement is not fulfilled (i.e. grains were 'poorly-bleached'), ages may be grossly overestimated. In particular, poor-bleaching can significantly affect age estimations of young sediments. Standard procedures for estimating the burial dose of a sediment make use of a large number of grains (aliquot) that is measured simultaneously. This approach has been shown to work well, but only on homogeneously bleached sediments. An alternative way to investigate poor-bleaching within a sample is to measure the OSL signal from individual grains rather than from aliquots made up of several thousands of grains. The advantage is that individual grains with large doses (possibly due to poor-bleaching) can be identified and dealt with. Drawbacks are that only a small percentage of the measured grains produce detectable signals and luminescence responses are weak. The aim of this publication it to determine the feasibility of applying dating techniques to individual grains of quartz from deposits formed within the last 300 years."
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Summary and Conclusions
accepted grains aeolian analysis bleached grains bright grains burial dose calculated channels dating of quartz decay curve Delft disc dose estimates dose rate dose-response curve Duller dune ridge equivalent dose equivalent doses obtained feldspar filter combinations grain measurements histograms Holocene independent age control individual grains insufficiently bleached integration interval investigate irradiation luminescence dating luminescence signal mean method modified SAR protocol Murray and Wintle natural dose Netherlands normally distributed number of grains Olley Optical dating optically stimulated luminescence OSL ages OSL dating OSL measurements OSL response OSL signal overestimation palaeodose plotted poor bleaching poorly-bleached preheat temperature quartz from young quartz grains Radiation Measurements recuperation recycling ratio regenerative dose rejection criteria RSE threshold sediments signal integration single grain single grain measurements single-aliquot single-aliquot to single-grain skewed synthetic aliquot test dose Texel thermal transfer U340 filter uncertainties Wallinga well-bleached young deposits young samples zero zijn