Optical dating: Recuperation after bleaching

Aitken, M. J.; Smith, B.W.

doi:10.1016/0277-3791(88)90034-0

Cited by 164 publications

(82 citation statements)

References 7 publications

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“…Preheating the sample can also cause recuperation of the OSL signal (Aitken, 1985;Aitken and Smith, 1988). To test for this a 0 Gy regenerative dose step was incorporated into the SAR protocol (Murray and Wintle, 2000).…”

Section: Methodsmentioning

confidence: 99%

OSL dating and lithological characteristics of loess deposits from Biały Kościół

2011

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Absolute dating using luminescence methods is widely applicable in geology, geomorphology, palaeogeography and in archaeology in establishing ages of sediments and archaeological artefacts. By creating absolute time scales for different events in the history of Earth scientists are able to reconstruct changes in climate and environment in the past, and the history of colonization and development of culture. Grain size is the most important loess lithologic property. Grain size composition depends mainly on factors connected with depositional processes (i.e. variety of source areas, distance from source areas, frequency and intensity of dust transporting winds). The influence of post depositional processes on changes in grain size composition seems to be of less importance with the exceptions for warm and long periods of intensive pedogenesis, which are favorable for formation of clay minerals. Therefore the grain size differentiation within thick loess sections may be used as a proxy record of climate changes during loess cover development. Here we present results for 12 samples dated at the profile at Biały Kościół. Obtained OSL results in some cases are quite different as compared with the OSL and TL dates obtained during last 10 years by other authors and presented in previous publications relating to this loess profile.

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Section: Methodsmentioning

confidence: 99%

OSL dating and lithological characteristics of loess deposits from Biały Kościół

2011

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“…Pour certaines mesures sur les feldspaths, la préchauffe conventionnelle de 10 minutes à 220°C est appliquée (Li, 1991). Pour ces mesures, il faut vérifier qu'aucun phénomène de récupération n'a lieu (Aitken et Smith, 1988 ;Aitken, 1992). Pour un quartz de 100 Gy, une …”

Section: Méthode Des Doses Additivesunclassified

“…Avant les lectures OSL, les feldspaths sont préchauffés 8-10 heures à 160°C ou 10 minutes à 220°C (Li, 1991) et les quartz 5 minutes à 220°C et ce, afin d'éliminer le signal de luminescence instable engendré par les irradiations artificielles (Rhodes, 1988 ;Bailiff et Poolton, 1991 ;Aitken, 1992). Le transfert indésiré d'électrons de pièges insensibles à la lumière et thermiquement instables vers des pièges sensibles à la lumière et thermiquement stables (Aitken et Smith, 1988 ;Aitken, 1992) est contrôlé par des tests qui consistent à lire l'OSL d'aliquotes naturelles et irradiées comme pour la courbe de croissance mais une étape de lessivage optique complet de l'échantillon est introduite avant la préchauffe. Si la luminescence des aliquotes irradiées et lessivées n'est pas nulle, cela veut dire qu'il y a eu transfert thermique.…”

Section: Méthode Des Doses Additivesunclassified

Application des méthodes de datation par luminescence optique à l'évolution des environnements désertiques :

Bouab¹

2001

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“…transfer of charge from thermally shallow but optically insensitive traps to the deeper trap responsible for the OSL signal, as a result of laboratory heating, optical stimulation, or a combination of the two) (e.g. Aitken and Smith, 1988;Stokes, 1992;Banerjee, 2000). Internal variability leads to the observation of different 'grain behavioural types', seen in luminescence properties such as brightness and dose response characteristics (e.g.…”

Section: The Sources Of Uncertainty and Scatter Of D E Estimatementioning

confidence: 99%

Employing Minimum age model (MAM) and Finite mixture modeling (FMM) for OSL age determination of two important samples from Ira Trench of North Tehran Fault

2016

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Ira trench site is in a point where, the surface trace of North Tehran Fault (NTF) joins the Mosha Fault (MF) in the north-eastern margin of Tehran and can provide important paleosismological information for Tehran. The Ira trench, were divided into 6 packages (I to VI), described, according to their composition, relative and absolute ages. Package I consists of units 23, 25, 26, 27, 28, 29, 30 and 31. The whole package I mainly belongs to Holocene, and provides essential constraints for the recent paleo-earthquake activity of the EMF and NTF zone. Therefore, finding accurate ages for the units of this package is very important. Three colluvial wedges (units 23, 26, 28) are present between 20 and 36.5 m north in package I, which are assigned to 3 episodes of activity on Fault 13. Central age model (CAM) provided OSL ages of 35.0 ± 6.1, 7.3 ± 1.3, 6.4 ± 0.9 and 56 ± 6.5 ka for units 23, 26, 28 and 29, respectively. The conflicting ages of 56 ± 6.5 and 35.0 ± 6.1 ka (for units 23 and 29, respectively) as compared to the underlying younger units suggest that these ages are overestimated. MAM provided OSL ages of 13.1 ± 4.3 and 3.5 ± 0.4 ka for units 23 and 29, respectively. The contribution of the new statistical age model of sample IRA4 to the paleoseismic data is discussed.

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Optical dating: Recuperation after bleaching

Cited by 164 publications

References 7 publications

OSL dating and lithological characteristics of loess deposits from Biały Kościół

OSL dating and lithological characteristics of loess deposits from Biały Kościół

Application des méthodes de datation par luminescence optique à l'évolution des environnements désertiques :

Employing Minimum age model (MAM) and Finite mixture modeling (FMM) for OSL age determination of two important samples from Ira Trench of North Tehran Fault

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