This paper aims to provide an overview concerning the optically stimulated luminescence OSL dating method and its applications for geomorphological research in France. An outline of the general physical principles of luminescence dating is given. 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. The paper also reviews the place of OSL dating in geomorphological research in France and assesses its potential for further research, by focusing on the diversity of sedimentary environments and topics to which it can be usefully applied. Hence it underlines the increasing importance of the method to geomorphological research, especially by contributing to the development of quantitative geomorphology. They are now largely used to date not only palaeontological or organic remains, but also minerals that characterise detrital clastic sedimentary material. The most common methods applied to minerals are cosmogenic radionuclides, electron spin resonance ESR and luminescence techniques. The latter were first applied to burned minerals from archaeological artefacts [thermoluminescence TL method]. Improvements of this technique led to the development, for more than twenty years, of the optical dating method [commonly referred to as Optically Stimuled Luminescence OSL ] which is now applied to sediments from various origins Wintle,
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Kenworthy , Boise State University T. Rittenour , Utah State University J. Sutfin , Boise State University W. Sharp , Berkeley Geochronology Center. Optically stimulated luminescence OSL dating is increasingly used to estimate the age of fluvial deposits.
We use optically stimulated luminescence (OSL) to date aeolian, fluvial, lacustrine and shallow water marine sediments, as well as most quartz or feldspar-bearing.
The USU luminescence geochronology lab houses a new optically stimulated luminescence OSL reader capable of single grain measurements. The instrument was acquired with funds from a charitable donation and the lab is now fully operational for dating the “burial” age or date of last exposure to sunlight of minerals, most commonly quartz sands. Research applications that rely on the OSL technique include dating of river and beach deposits, landslides and fired pottery, especially where no contemporary organic materials are available or where the burial ages exceed the radiocarbon dating maximum of ca.
This technical position will advance the goals of the lab which include expanding applications of OSL for studies in geomorphology, geohazards, and geoarchaeology, and to support student training and research. Some full text articles may not yet be available without a charge during the embargo administrative interval.
Some links on this page may take you to non-federal websites. Their policies may differ from this site. Rittenour, TM. View record at Web of Science. Summa, M. Hayden, A. Kenworthy, M. Rittenour, T.
The Vienna luminescence lab was founded in the year The lab was build with the perspective of elaborating key questions of environmental and Quaternary research, as e. Markus Fiebig markus. Optically stimulated luminescence OSL dating determines the last exposure to sunlight of a sediment. Sedimentation ages are calculated by deviding the equivalent dose De by the dose rate Do.
Abstract: Luminescence dating is a tool frequently used for age determination of ways on whether TL, optically stimulated lu- For alluvial sediments, several.
Springer Professional. Back to the search result list. Table of Contents. Hint Swipe to navigate through the chapters of this book Close hint. Abstract Optically stimulated luminescence OSL dating is a versatile technique that utilises the two most ubiquitous minerals on Earth quartz or K-feldspar for constraining the timing of sediment deposition. It has provided accurate ages in agreement with independent age control in many fluvial settings, but is often characterised by partial bleaching of individual grains.
Partial bleaching can occur where sunlight exposure is limited and so only a portion of the grains in the sample was exposed to sunlight prior to burial, especially in sediment-laden, turbulent or deep water columns. OSL analysis on multiple grains can provide accurate ages for partially bleached sediments where the OSL signal intensity is dominated by a single brighter grain, but will overestimate the age where the OSL signal intensity is equally as bright often typical of K-feldspar or as dim sometimes typical of quartz.
In such settings, it is important to identify partial bleaching and the minimum dose population, preferably by analysing single grains, and applying the appropriate statistical age model to the dose population obtained for each sample. To determine accurate OSL ages using these age models, it is important to quantify the amount of scatter or overdispersion in the well-bleached part of the partially bleached dose distribution, which can vary between sediment samples depending upon the bedrock sources and transport histories of grains.
Here, we discuss how the effects of partial bleaching can be easily identified and overcome to determine accurate ages. This discussion will therefore focus entirely on the burial dose determination for OSL dating, rather than the dose-rate, as only the burial doses are impacted by the effects of partial bleaching. Please log in to get access to this content Log in Register for free.
Luminescence dating, particularly using optically stimulated luminescence OSL , is revolutionizing Quaternary and archaeological science because it allows dating of sediments and artifacts that perhaps 10 years ago could not be dated. The lab has produced more than OSL ages from years to , years for aeolian, fluvial, lacustrine, and marine sediments, as well as pottery, artifacts and secondary carbonate.
Chronologies have been developed for archaeological sites in Botswana and the U.
Luminescence dating, particularly using optically stimulated luminescence (OSL) years to , years) for aeolian, fluvial, lacustrine, and marine sediments.
Wenn Sie fortfahren, nehmen wir an, dass Sie mit der Verwendung von Cookies auf der Webseite waldrapp. The luminescence has been actively involved in the development and application of luminescence dating. OSL and TL dating of terrestrial and marine applications in the case with ceramics or burnt stone, in the case of sediments. The Laboratory also provides education through research experiences for graduate students, post-doctoral scholars and visitors.
Luminescence dating is an osl dating method that measures the energy with photons being released. This stored radiation dose can be evicted with stimulation and released as luminescence. The calculated age is the time since the last exposure to sunlight or intense heat. Equivalent dose is the laboratory of radiation dose that is necessary to account for the measured luminescence signal, in other words, how much radiation is needed to get from zero luminescence to the current, natural luminescence.
Dividing by the dose luminescence gives the age. Luminescence dating has been applied depending on labs from sediments ranging from 10 – best dating website seattle 10 6 , although more commonly the upper limit is ka. It has been applied to aeolian, fluvial, lacustrine, glaciogenic, coastal and marine labs, in addition to a relative range of research in archaeology and art antiquity. Introduction The laboratory has been actively involved in the development and application of labs dating.
Optically stimulated luminescence
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Until the late s, the great majority of OSL dates were based on infrared (IR) fluvial channel deposits in the Rhine-Meuse system in the. Netherlands (after.
Stor, T. The fluvial style changes from a high-energy braided to a long-bend meandering river in the upper terrace levels 36 to 31 m above present floodplain. The middle terrace levels 22 to 16 m above present floodplain indicate a fluvial style changing from a high- to medium-energy braided river. In the lower terrace levels 13 to 7 m above present floodplain , the terrace deposits indicate high-energy braided to long-bend meandering river environments. Terraces found at 36 m, 31 m and 16 m above present floodplain are dated with isochron burial dating whereas terraces 22 m, 13 m and 7 m above present floodplain are dated with OSL.
Due to differences in age results between the two dating methods, we establish two different evolution models: The first is based on isochron burial and OSL dating and the second model is on the OSL dating results only. The time span represented by the river terraces remains unclear and varies from Eburonian to Eemian to 56 ka or from Elsterian to Eemian to 56 ka , respectively. The former river evolution model is based on tectonic activity at least since ka. Based on dated terrace ages of ka at 14 m above present floodplain and ka at 19 m above present floodplain, we suppose a normal fault being active from at least ka.
Testing Luminescence Dating Methods for Small Samples from Very Young Fluvial Deposits
Research article 09 Aug Correspondence : Elizabeth L. Chamberlain elizabeth.
Realizing the potential of fluvial archives using robust OSL chronologies. Dating alluvial deposits with optically stimulated luminescence, AMS 14C and.
Optically stimulated luminescence and isothermal thermoluminescence dating of high sensitivity and well bleached quartz from Brazilian sediments: from Late Holocene to beyond the Quaternary?. ISSN The development of optically stimulated luminescence OSL dating of sediments has led to considerable advance in the geochronology of the Quaternary.
OSL dating is a well established technique to determine sediment burial ages from tens of years to few hundred thousand years. Recent studies have shown that Quaternary sediments of Brazil are dominated by quartz grains with high luminescence sensitivity, allowing the determination of precise and reliable OSL burial ages. We discuss the OSL data and ages of sediments from carbonate and terrigenous distributary and tributary systems fluvial depositional contexts in Brazil. Most of the studied fluvial sediments show equivalent dose distributions with low to moderate dispersion, suggesting well bleached sediments.
The comparison between aliquot and single grain data suggests that high overdispersion in equivalent dose distributions of some samples is more related with sediment mixture due to bioturbation than with incomplete bleaching during transport. Well bleached fluvial sediments contrast with the poor bleached pattern usually described for fluvial sediments in the literature. A large part of the fluvial sedimentary record in Brazil is older than the age limit for quartz OSL dating using blue light stimulation.
Thus, isothermal thermoluminescence ITL dating protocols were tested for dating of fluvial sands from the Xingu River eastern Amazonia.
Luminescence Chronology of Terrace Development in the Upper Paraná River, Southeast Brazil
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Well constrained numerical ages of alluvial fan sediments are key to understanding the chronology of alluvial episodes and tectonic activity at the front of the Andean Precordillera. We tested the application of radiocarbon and optically stimulated luminescence OSL dating in the distal part of an alluvial fan five kilometers north of Mendoza. Owing to a feldspar contamination in all samples, an infrared stimulation was inserted before each OSL measurement, which reduced the feldspar OSL signal successfully.
By using the minimum age model we obtained stratigraphically consistent burial ages of alluvial deposits in a depth profile. Three plant remnants used for radiocarbon dating from the same layer, however, yielded ages younger than years, which are interpreted to underestimate the depositional age. Underneath the debris flow, a major unconformity cuts a series of distal alluvial fan sediments with interstratified floodplain deposits, which are composed of sandy and calciterich silt layers, respectively.
Three samples from this unit which were distributed over one meter of sediment thickness yielded statistically concordant OSL ages of The deposition of these sediments during the latest Pleistocene coincides with a phase of cool and humid climate, which occurred before the alluvial fan propagated farther into the foreland. The overlying debris flow sediments are associated with alluvial fan incision during the arid Late Holocene. Dose-rate conversion factors: update. Ancient TL 16 2 : 37— Thermoluminescence Dating.
Academic Press, New York: pp.