Jain Mayank, Murray A. Optically stimulated luminescence dating: how significant is incomplete light exposure in fluvial environments? In: Quaternaire , vol. Fluvial Archives Group. Clermond-Ferrant Optically stimulated luminescence OSL dating of fluvial sediments is widely used in the interpretation of fluvial response to various allogenic forcing mechanisms during the last glacial-mterglacial cycle.
Optically Stimulated Luminescence (OSL) Dating Lab
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.
Abstract: Luminescence dating is a tool frequently used for age determination of ways on whether TL, optically stimulated lu- For alluvial sediments, several.
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.
As the OSL of a sediment is quickly lost when exposed to sunlight tens of seconds many sediments are bleached lack an OSL signal when deposited and buried. After deposition these sediments accumulate luminescence which can be measured allowing the age of burial to be determined. There is now convincing evidence that many glacial, fluvial, aeolian, and even shallow marine sediments can be dated by OSL techniques. The upper limit of age by OSL is largely determined by the annual dose on the sediment which is related to it’s content of uranium, thorium and potassium.
Low levels of radioactive isotopes in the sediment lead to very slow saturation of quartz and feldspar grains by released electrons and so ages in excess of ka may be possible. Your gift is important to us and helps support critical opportunities for students and faculty alike, including lectures, travel support, and any number of educational events that augment the classroom experience.
Optically stimulated luminescence
Widoczny [Schowaj] Abstrakt. Aitken MJ, An Introduction to Optical Dating. Oxford University Press: Oxford. Alexanderson H,
The Rhine-Meuse system in a new light: optically stimulated luminescence dating and its application to fluvial deposits. Front Cover. Jakob Wallinga. The Royal.
Although luminescence signals bleach rapidly with sunlight exposure, incomplete bleaching may affect luminescence ages, in particular in fluvial settings where an unbleached remnant signal is commonly encountered in modern alluvium. We relate this pattern to the rapid reinstatement of steady-state incision following the formation of a major, climate-driven, aggradation terrace, causing a phase of accelerated incision.
In addition, we show systematic variations in the proportion of unbleached grains in the fluvial sediments over time, mirroring incision rate at the time of deposition. Deposits formed during rapid incision contain fewer bleached grains, which we attribute to large input of unbleached material and limited bleaching opportunities during fluvial transport. This finding demonstrates that the luminescence signals recorded in fluvial terraces not only yield age information, but also inform us on past fluvial transport and ultimately, landscape dynamics.
Those based on Optically Stimulated Luminescence OSL on quartz or on Infrared Stimulated Luminescence IRSL on feldspars allow estimation of the time of deposition and burial of sediments 1 , 6 , but sometimes give overestimated ages when light-exposure has not been sufficient to reset the luminescence signals prior to burial 7 , a problem that can be significant in fluvial settings.
Actually, although luminescence signals bleach rapidly with sunlight exposure 8 , an unbleached remnant signal is commonly encountered in modern alluvium 9 , 10 , 11 , 12 , 13 , 14 ,
Optically Stimulated Luminescence
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.
1The Nordic Laboratory for Luminescence Dating, Department of Earth Sciences, Abstract: Optically stimulated luminescence (OSL) dating of light-exposed sediments is used single aliquot of year old fluvial bedload from a channel of.
In the last few decades optically stimulated luminescence OSL dating has become an important tool in geochronological studies. The great advantage of the method, i. This can result in a scattered distribution of equivalent doses D E , leading to incorrect estimation of the depositional age. Thoroughly tested protocols as well as good data analysis with adequate statistical methods are important to overcome this problem.
In this study, samples from young fluvial sand and flood plain deposits from the Elbe River in northern Germany were investigated to compare its depositional ages from different age models with well-known historical dates. The paleodose D P was calculated from the DE data set using different approaches. Results were compared with the development of the Elbe River, which is well-documented by historical records and maps covering the last 1, years.
Depending on the statistical approach it can be demonstrated that depositional ages significantly differ from the most likely depositional age. For the investigated coarse grain quartz samples all ages calculated from the MAM-3 UL , including their uncertainties, are within the historical documented age. Results of the polymineral fine grain samples are overestimating the historically documented depositional age, indicating undetectable incomplete bleaching.
This study shows the importance of using an adequate statistical approach to calculate reliable OSL ages from fluvial sediments. This is a preview of subscription content, log in to check access. Aitken MJ,
8. Luminescence Dating in Fluvial Settings: Overcoming the Challenge of Partial Bleaching
Fluvial deposits is increasingly used for osl dating is tightly constrained by radiocarbon dating on multiple and terraces. Dating programme, optically stimulated luminescence osl dating on multiple and fluvial sediments are not ideal for dating programme, i. Fluvial deposits. In the.
Welcome to the USGS Luminescence Dating Laboratory Site. Information Controlling Assumptions – TL and OSL Method Contributions to Sediments.
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.
Publications Repository – Helmholtz-Zentrum Dresden-Rossendorf
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.
“OSL chronology for alluvial fan deposition in the Lost River Range, Idaho,”, 04/01//31/, , “New World Luminescence Dating and Dosimetry.
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, The aim of this paper is to provide people involved in geomorphological research a global overview about the principles and procedures of optical dating, from the field sampling to the age interpretation.
Most of the publications actually focus on one part of either the method e. The general principles of the method are described first. The paper then explains how OSL dating is applied to obtain a depositional age, through the field and laboratory procedures employed. These procedures are described as clearly as possible in order to provide useful information for geomorphologists interested in the method, and illustrated by a case study that has involved luminescence dating of fluvial sands samples LUM and LUM from the lower alluvial terrace of the Moselle River M1 terrace as defined by S.