Assessing the maximum limit of SAR-OSL dating using quartz of different grain sizes

• Autorzy: Anechitei-Deacu V. , Timar-Gabor A. , Constantin D. , Trandafir-Antohi O. , Del Valle L. , Fornós J. J. , Gómez-pujol L. , Wintle A. G.

Identyfikatory

DOI

10.1515/geochr-2015-0092

• Języki publikacji: EN

Abstrakty

EN

SAR-OSL dating studies of Romanian, Serbian and Chinese loess using fine and coarse quartz have previously resulted in a series of controversial issues. We extend here the investigations using fine (4–11 μm) and different coarse quartz (>63 μm) grains extracted from aeolianites from a site on Eivissa Island (southwestern Mediterranean). Aeolianites were chosen since they contain quartz from a different geological context and have significantly lower environmental dose rates. The dose response curves of the OSL signals for fine and coarse quartz are similar to those for loess and are also represented by the sum of two saturating exponential functions. For doses up to ~200 Gy, the dose response curves of fine and coarse grains from aeolianites can be superimposed and the ages obtained for the different grain sizes are in agreement up to ~250 ka, increasing our confidence in the accuracy of the ages obtained for samples with such doses, irrespective of the magnitude of the environmental dose rate. Particularly for the fine quartz fraction, a mismatch between the SAR dose response curve and the dose response curve obtained when doses are added to the natural is reported, indicating that the application of the SAR protocol in the high dose range is problematic. This dose dependent deviation is much less pronounced for coarse grains. Thus, it seems reasonable to infer that the dose response curves for the coarse grains, although saturating earlier can be regarded as more reliable for equivalent dose calculation than those for the fine grains.

Słowa kluczowe

EN

quartz; SAR-OSL; aeolianites; dose-response; saturation characteristics; accuracy

• Wydawca: De Gruyter
• Czasopismo: Geochronometria
• Rocznik: 2018
• Tom: Vol. 45, no. 1
• Strony: 146--159
• Opis fizyczny: Bibliogr. 43 poz., rys.

Twórcy

autor

Anechitei-Deacu V.

• Faculty of Environmental Sciences and Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania
• Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeş-Bolyai University, Cluj-Napoca, Romania

autor

Timar-Gabor A.

• Faculty of Environmental Sciences and Engineering, Babeş-Bolyai University, Cluj-Napoca, Romania
• Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeş-Bolyai University, Cluj-Napoca, Romania

autor

Constantin D.

• Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeş-Bolyai University, Cluj-Napoca, Romania

autor

Trandafir-Antohi O.

• Interdisciplinary Research Institute on Bio-Nano-Sciences, Babeş-Bolyai University, Cluj-Napoca, Romania
• Faculty of Physics, Babeş-Bolyai University, Cluj-Napoca, Romania

autor

Del Valle L.

• Earth Sciences (Geology and Paleontology “Guillem Colom”) Research Group, Department of Biology, Universitat de les Illes Balears, Palma, Spain

autor

Fornós J. J.

• Earth Sciences (Geology and Paleontology “Guillem Colom”) Research Group, Department of Biology, Universitat de les Illes Balears, Palma, Spain

autor

Gómez-pujol L.

• Earth Sciences (Geology and Paleontology “Guillem Colom”) Research Group, Department of Biology, Universitat de les Illes Balears, Palma, Spain

autor

Wintle A. G.

• Institute of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, UK
• McDonald Institute for Archaeological Research, University of Cambridge, Cambridge, UK

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).