Chronology of Inland Eolian Dunes on the Coastal Plain of Georgia, USA

Ivester, Andrew H.; Leigh, David S.; Godfrey-Smith, D.I.

doi:10.1006/qres.2001.2230

Cited by 61 publications

(45 citation statements)

References 13 publications

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“…We stress that such large depth-related age changes are atypical in most clastic-rich sediments, in which self dose rates are Ͼ2 Gy/ka and the cosmic dose rate is, therefore, a much smaller fraction of the total R. The depth variations are significant to the age estimate of NHV1 because radioisotope-poor carbonates and quartz dominate this sediment, and therefore its self ␤ and ␥ dose rates are very low. They would be equally significant in other quartz-dominated, very mature sediments (Ivester et al, 2001). In any event, we suggest that the kurkar is cognate with the Dor Kurkar exposed at the Givat Olga section, which has yielded an average age of 54 Ϯ 9 ka based on IRSL dating of potassium feldspar grains (Frechen et al, 2002).…”

Section: Discussion Of Luminescence Agesmentioning

confidence: 95%

“…It yielded a mean D e ϭ 4.46 Ϯ 0.30 Gy ( M ϭ Ϯ0.09 Gy, n ϭ 10). The validity of the SAA method for dating quartz-rich sediments within the Epipaleolithic time frame was verified in an earlier study (Ivester et al, 2001). A past D e was obtained for each aliquot by extrapolation of a least squares fit of the preheat-corrected dose response growth curve, with inverse weighting with respect to intensity.…”

Section: E Determinationsmentioning

confidence: 99%

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Direct luminescence chronology of the Epipaleolithic Kebaran site of Nahal Hadera V, Israel

et al. 2003

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We report direct luminescence ages for the culture-bearing sediments of the Kebaran site of Nahal Hadera V (NHV) in the coastal plain of Israel. Although the site contains, in addition to rich lithic deposits, plentiful mammalian bone, it has proved to be undatable using radiocarbon dating, in spite of the fact that the cultural context places the time of occupation well within the range of radiocarbon dating. In contrast, luminescence dating of the site sediments proved successful. Luminescence ages were determined using the single aliquot additive-dose (SAA) method, applied to sand-sized quartz extracts to determine past equivalent doses (D e ). Dose rates (R) were calculated using thick source alpha counting for the uranium (U) and thorium (Th) concentrations and x-ray fluorescence analysis for the potassium (K 2 0) concentration. Of the five samples collected at the site, four represent cultural and subcultural deposits and the fifth represents the geological substrate for the archaeological deposit, a quartzrich, carbonate-cemented dune sand known as aeolianite or kurkar. The luminescence age of the kurkar is 42.7 Ϯ 6.3 ka. Human occupation of the site occurred between 21.3 ka and 14.0 ka ago, during the Last Glacial Maximum. ᭧

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Section: Discussion Of Luminescence Agesmentioning

confidence: 95%

Section: E Determinationsmentioning

confidence: 99%

Direct luminescence chronology of the Epipaleolithic Kebaran site of Nahal Hadera V, Israel

et al. 2003

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“…The benefit of using optical dating is that samples that have been exposed to only a few seconds of direct sunlight can be dated, which permits much younger samples to be dated than can be using TL. Optical dating has been crucial for providing chronologies for eolian activity in many parts of the world (e.g., Stokes and Gaylord, 1993;Ollerhead et al 1994;Stokes et al, 1997;Ivester et al, 2001;Arbogast et al, 2002;Chen et al, 2002;Forman and Pierson, 2002;Little et al, 2002;Thomas et al, 2002; this volume, among many others).…”

Section: Luminescence Datingmentioning

confidence: 99%

Optical Dating of Eolian Dune Sand from the Canadian Prairies*

Lian

Huntley

Wolfe

2004

gpq

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Optical dating is a well-established method that is used to determine the time elapsed since quartz or feldspar grains were last exposed to sunlight, which usually dates the time elapsed since their burial in a sedimentary deposit. Only a few seconds of direct sunlight are needed to reset the “mineral clock”, making the method ideal for dating the formation of eolian landforms. In this paper we describe how we use violet luminescence that is emitted in response to near-infrared excitation of sand-sized K-feldspar grains to date the time of formation of eolian dunes on the Canadian prairies. Using the multiple-aliquot with thermal transfer correction method, together with a test for sufficient sunlight exposure, and a correction for anomalous fading, we are able to produce accurate optical ages ranging from 150 years to more than 11 ka with precision usually better than 10 % at 2σ. Ages are given for dunes in the Dundurn and Elbow sand hills of south-central Saskatchewan, the climatic significance of which is provided in a paper also in the present volume. Knowledge of when the dunes were stable, and when they were not, is used to help understand the nature and timing of Holocene climate change in the area.La datation optique est une méthode reconnue employée pour déterminer le temps écoulé depuis que des grains de quartz ou de feldspath potassique ont été pour la dernière fois exposés à la lumière du soleil, ce qui correspond généralement au temps écoulé depuis leur enfouissement dans un dépôt sédimentaire. Quelques secondes seulement de lumière du soleil directe suffisent pour remettre à zéro « l’horloge minérale », ce qui en fait une méthode parfaitement appropriée pour dater la formation de dépôts éoliens. Nous décrivons ici comment utiliser la luminescence violette émise en réponse à une excitation à l’infrarouge des grains de feldspath de la taille du sable pour dater la formation des dunes dans les Prairies. Grâce à la méthode des portions aliquotes multiples comprenant une correction pour le transfert thermique, ainsi qu’un test d’exposition suffisante au soleil et une correction pour la décroissance anormale, nous pouvons obtenir des âges optiques précis à partir de 150 ans jusqu’à plus 11 ka avec une précision généralement supérieure à 10 % à 2σ. Les âges proviennent des dunes des collines Dundurn et Elbow, dans le centre sud de la Saskatchewan ; leur signification au plan climatique est donnée dans un autre article du présent numéro. La connaissance des périodes de stabilité des dunes sert à comprendre la nature et le synchronisme des changements climatiques survenus dans la région, au cours de l’HolocèneLa datación óptica es un método conocido que se emplea para determinar el tiempo transcurrido desde que los granos de cuarzo y feldespato fueron expuestos a la luz del sol, este proceso generalmente refleja el tiempo transcurrido durante el cual los sedimentos terminan por ser sepultados. Unos pocos segundos de exposición a la luz del sol bastan para poner en marcha el “reloj mineral”, esta característi...

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“…He states there were active dunes downstream of the PAW site in the Cape Fear River valley between ∼8300-6300 cal yr BP and in coastal Georgia ∼9500-4500 cal yr BP (Ivester et al, 2001). It is possible that dune reactivation occurred during the wet phase at PAW, and as Otvos points out the PAW site "lacks explicit aridity indicators."…”

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confidence: 99%

“…However, our interpretation of these data differs from Otvos. The Holocene dune activity in Georgia was interpreted as sporadic and spatially limited reworking of crests of unusually thick riverine dunes and not related to renewed sedimentation of parabolic dune fields (Ivester et al, 2001). Further, the authors "do not know if the Holocene reworking is a result of climate change, localized fires, or human destabilization of the dune surface" (Ivester et al, 2001, pp.…”

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confidence: 99%