Methodological considerations in the optical dating of quartz

14-Nov-2019 09:20 by 9 Comments

Methodological considerations in the optical dating of quartz - Freisex cam

Thermal or optical stimulation of dosed mineral grains results in release of radiation-induced luminescence.The amount of radiation damage and, thus, the acquired luminescence signal is at least within certain limits, proportional to the time during which the insulating minerals were exposed to ionizing radiation.

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Luminescence dating is based on the perception in solid state physics that energy from the absorption of ionizing radiation can be stored in the crystal lattice of insulators as radiation damage.Optically stimulated luminescence (OSL) dating of perenially frozen deposits in north-central Siberia: OSL characteristics of quartz grains and methodological considerations regarding their suitability for dating Arnold, L. Here we provide a systematic examination of the quartz luminescence characteristics of 21 perennially frozen samples from the Taimyr Peninsula and adjacent coastal lowlands of north-central Siberia, and discuss their implications for the reliability of single-grain and multi-grain OSL chronologies in such contexts. However, relatively little information has been published on the suitability of OSL dating for the various types of perennially frozen sediments found in this region.Assuming a constant rate of natural ionizing radiation the age is calculated as the ratio of the accumulated dose over the dose-rate.The present contribution deals with the history of luminescence dating from the first observations of the luminescence phenomenon via the first proposal to use it for dating purposes, and the first dating application to the present wide field of applications in archaeology, Quaternary geology, geomorphology and geoarchaeology.Ainsi, l’article souligne l’importance de la méthode pour les recherches en géomorphologie, notamment dans le cadre du développement de la géomorphologie quantitative.

Absolute dating methods have been developed over the last five decades (Jull and Scott, 2007).We also show that samples from the same depositional settings, and even from the same sites, do not necessarily display similar De distribution characteristics.The latter complication favours the use of single-grain analysis to unravel the bleaching and burial histories of young (mid- to late Holocene) sediments in these Arctic environments Lee J Arnold and Richard Roberts.Problems associated with the technique of optical dating are discussed, particularly the thermal treatment that is necessary to remove thermally unstable charge following artificial irradiation, and the extrapolation of growth curves to estimate the equivalent dose.The technique used is described and some preliminary dates are presented.A case study of fluvial sands from the lower terrace of the Moselle valley is then presented to describe the range of field and laboratory procedures required for successful luminescence dating.

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