Optical dating of Romanian loess: A comparison between silt-sized and sand-sized quartz

Timar-Gabor, Alida; Vandenberghe, Dimitri; Vasiliniuc, Stefan; Panaoitu, C.E.; Panaiotu, Cristian; Dimofte, Daniela; Cosma, C.

doi:10.1016/j.quaint.2010.10.007

Cited by 117 publications

(76 citation statements)

References 43 publications

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“…From the viewpoint of the obtained results we should also consider whether the luminescence results obtained for quartz can be underestimated in connection with the quartz luminescence properties. In the literature, several workers have reported age underestimation in OSL dating (Lowick et al, 2010;Timar-Gabor et al, 2011, Chapot et al, 2012 for high D e doses (more than 150 Gy). In the S1 unit, for all samples the equivalent doses (D e 's) show a clear change with depth for all fractions.…”

Section: Resultsmentioning

confidence: 99%

OSL chronostratigraphy for loess deposits from Tyszowce – Poland

et al. 2017

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Abstract:The presented work concerns a loess profile located in Tyszowce, in the eastern part of Poland on the Volyn Upland, close to the Ukrainian border. The investigated loess formation is well preserved and is characterised by clear stratigraphic units providing an opportunity to refine the loess chronostratigraphy in Poland. In the paper, we present luminescence ages of loess from the last glacial cycle in SE Poland (up to about 100 ka) together with seven radiocarbon ages. Twenty-one samples were collected and dated using infrared (post-IR IRSL) and blue light stimulated luminescence dating. Two fractions were used, namely polymineral fine grains (4-11 µm) and medium sized quartz grains (45-63 µm). The obtained luminescence ages show very good agreement of both methods in relation to loess deposits, however for the fossil soil units the post-IR IRSL method yields older ages. Radiocarbon dates also confirm luminescence chronostratigraphy for younger units. Moreover, the luminescence results are supported by detailed analyses of grain size distribution, carbonate content and magnetic susceptibility variations allowing to create a comprehensive picture of chronological evolution of this site.

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Section: Resultsmentioning

confidence: 99%

OSL chronostratigraphy for loess deposits from Tyszowce – Poland

et al. 2017

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“…Samples of quartz extracted from loess are as follows. Samples coded as MV were collected from the Mircea Voda loess-paleosol section in Dobrogea, Romania (Timar et al, 2010;Timar-Gabor et al, 2011). CAC is the code for samples from the section at Caciulatesti in southern Romania (Constantin et al, 2012).…”

Section: Samples Instrumentation and Measurement Protocolmentioning

confidence: 99%

On the importance of grain size in luminescence dating using quartz

Timar-Gabor

Buylaert

Guralnik

et al. 2017

Radiation Measurements

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h i g h l i g h t sDiscrepancy between quartz SAR-OSL ages obtained on fine and coarse grains. Dose response curve adequately fitted by a sum of two saturating exponentials. Isothermal decay fitted by a single exponential. Clear dependency between the saturation characteristics (D 0 s) and the quartz grain size. No correlation between the 2 D 0 value and the maximum attainable accurate equivalent dose. a r t i c l e i n f o a b s t r a c tThere are two major problems commonly encountered when applying Optically Stimulated Luminescence (OSL) dating in the high dose range: (i) age discrepancy between different grain sizes, and (ii) age underestimation. A marked and systematic discrepancy between fine-grain (4e11 mm) and coarse-grain (63e90 mm) quartz single aliquot regeneration protocol (SAR) ages has been reported previously for Romanian and Serbian loess >40 ka (D e of~100 Gy), generally with fine-grain ages underestimating the depositional age. In this paper, we show a similar age pattern for two grain size fractions from Chinese loess, thus pointing to a potential worldwide phenomenon. While age underestimation is often attributed to signal saturation problems, this is not the case for fine grain material, which saturates at higher doses than coarse grains, yet begins to underestimate true ages earlier. Here we examine the dose response curves of quartz from different sedimentary contexts around the world, using a range of grain sizes (diameters of 4e11 mm, 11e30 mm, 35e50 mm, 63e90 mm, 90e125 mm, 125e180 mm, and 180 e250 mm). All dose response curves can be adequately described by a sum of two saturating exponential functions, whose saturation characteristics (D 0 values) are clearly anticorrelated with grain diameter (4) through an inverse square root relationship, D 0 ¼ A/√4, where A is a scaling factor. While the mechanism behind this grain-size dependency of saturation characteristics still needs to be understood, our results show that the observation of an extended SAR laboratory dose response curve does not necessarily enable high doses to be recorded accurately, or provide a corresponding extended age range.

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“…2014; Stevens et al, 2011;Thiel et al, 2011;Timar-Gabor et al, 2011;Schmidt et al, 2010;TimarGabor and Wintle, 2013;Fitzisimmons and Hambach, 2014;Zöller et al, 2014). These developments in luminescence dating have been reviewed elsewhere (e.g.…”

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confidence: 99%

“…While quartz OSL dating is widely considered to be the most reliable method of choice for loess work, OSL dating of loessic quartz is generally acknowledged to have an upper age limit ranging from 50 to 100 ka (Wintle and Murray, 2006;Timar et al, 2010;Timar-Gabor et al, 2011;Timar-Gabor and Wintle, 2013). Investigations into the OSL characteristics of quartz of different size fractions from Romania, from sites with independent age control, suggest that the reliability and upper dating limit is partially dependent on the grain size chosen for measurement (Constantin et al,…”

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confidence: 99%