Bleaching studies on Al-hole ([AlO4/h]0) electron spin resonance (ESR) signal in sedimentary quartz

Timar-Gabor, Alida; Chruścińska, Alicja; Benzid, Khalif; Fitzsimmons, Kathryn E.; Begy, Róbert; Bailey, M. W.

doi:10.1016/j.radmeas.2019.106221

Cited by 23 publications

(8 citation statements)

References 29 publications

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“…The dating results based on the Ti-Li centre and Al centre of ESR signals of quartz fractions are summarised in Table 2. The Ti-Li centre ESR signals in this study should provide accurate estimates of the sedimentary ages for two reasons. (1) They are old with D e of >1500 Gy ( Table 2), given that the Ti centre ESR signal has a residual dose as large as~100 Gy (Tsukamoto et al, 2018;Richter et al, 2019;Timar-Gabor et al, 2020). 2There is no thermal fading involved both in measurement of ESR signals and in the burial processes.…”

Section: Esr Resultsmentioning

confidence: 99%

Sedimentary evidence and luminescence and ESR dating of Early Pleistocene high lake levels of Megalake Tengger, northwestern China

Fan

Yang

et al. 2020

J Quaternary Science

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The timing of high lake-level stands during the Late Pleistocene in western China remains controversial. Here we report new results from Megalake Tengger based on a study of palaeo-shorelines and a drill core from Baijian Lake in the northwestern Tengger Desert. Multiple dating methods, based on luminescence signals (quartz optically stimulated luminescence, K-feldspar post infrared-infrared stimulated luminescence) and electron spin resonance signals of quartz, were used to date beach sands from palaeo-shoreline profiles at altitudes of 1310 m (+20 m above lake level),~1320 m (+30 m) and~1350 m (+60 m), and from the top 20 m of sandy sediments from the drill core obtained from the modern beach of Baijian Lake. The dating results show that high lakelevel stands associated with the previously reported Megalake Tengger (~1310-1320 m) occurred during the late Early to Middle Pleistocene, which is much earlier than previously reported. In addition, no geomorphological evidence of shorelines and sedimentary evidence from the drill core profile were found to support the previously reported Late Pleistocene lake levels. Our results indicate that the exact age of the previously reported 'high lake level event' in a large part of northwestern China during the Late Pleistocene needs to be re-evaluated.

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Section: Esr Resultsmentioning

confidence: 99%

Sedimentary evidence and luminescence and ESR dating of Early Pleistocene high lake levels of Megalake Tengger, northwestern China

Fan

Yang

et al. 2020

J Quaternary Science

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“…Eqn (6) shows that the TL signal intensity is proportional to the rate of decline in the concentration of the absorption centers for a monochromatic light during sample heating. [35][36][37][38][39] In this experiment, at the initial time of heating, the carrier concentration in the absorption centers is greatest, so the absorption intensity reaches the maximum value for a monochrome light. As the temperature increases, the charges on the traps are released resulting in a decrease in the absorbing center concentration, and a decrease in absorption band strength is observed.…”

Section: ðForms Absorption Band At 345 Nmþmentioning

confidence: 86%

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Ngoc,

Ca,

Thanh

et al. 2024

RSC Adv.

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“…We hypothesise that the annealing changed the ratio of bleachable and unbleachable components of the Al centre, which led to the failure of the dose recovery test. Timar-Gabor et al (2020) demonstrated that the intensity of both the bleachable and unbleachable components of the Al centre can be increased by additive dose irradiation on natural aliquots. They explained that the Al centre has an unbleachable component, because the amount of Al in quartz is far more abundant compared to any other electron centres, which contributes to bleaching (and recombines with the Al-hole centre).…”

Section: Discussionmentioning

confidence: 99%

“…They thus emphasised the importance of subtracting the residual dose, not only for the Al centre but also for the Ti centre. Timar-Gabor et al (2020) measured the residual dose of aeolian samples from Australia and Ukraine, which have reported OSL D e values. For all samples, the ESR residual doses were found to be significantly larger than the OSL D e , with the Al centre (also with unbleachable signal component) ranging from 480 to 700 Gy and the Ti centre ranging 100 to 580 Gy, highlighting the necessity of performing a residual dose subtraction.…”

Section: Introductionmentioning

confidence: 99%

Investigation of quartz electron spin resonance residual signals in the last glacial and early Holocene fluvial deposits from the Lower Rhine

Richter

Tsukamoto

2022

Geochronology

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Abstract. In this study, we examined the residual doses of the quartz electron spin resonance (ESR) signals from eight young fluvial sediments with known luminescence ages from the Lower Rhine terraces. The single aliquot regenerative (SAR) protocol was applied to obtain the residual doses for both the aluminium (Al) and titanium (Ti) impurity centres. We show that all of the fluvial samples carry a significant amount of residual dose with a mean value of 1270 ± 120 Gy for the Al centre (including the unbleachable signal component), 591 ± 53 Gy for the lithium-compensated Ti centre (Ti-Li), 170 ± 21 Gy for the hydrogen-compensated Ti centre (Ti-H) and 453 ± 42 Gy for the signal that originated from both the Ti-Li and Ti-H centres (termed Ti-mix). To test the accuracy of the ESR SAR protocol, a dose recovery test was conducted and this confirmed the validity of the Ti-Li and Ti-mix signal results. The Al centre shows a dose recovery ratio of 1.75 ± 0.18, whereas the Ti-H signal shows a ratio of 0.55 ± 0.17, suggesting that the rate of signal production per unit dose changed for these signals after the thermal annealing. Nevertheless, all fluvial sediments investigated in this study carry a significant residual dose. Our result suggests that more direct comparisons between luminescence and ESR equivalent doses should be carried out, and, if necessary, the subtraction of residual dose obtained from the difference is essential to obtain reliable ESR ages.

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Bleaching studies on Al-hole ([AlO4/h]0) electron spin resonance (ESR) signal in sedimentary quartz

Cited by 23 publications

References 29 publications

Sedimentary evidence and luminescence and ESR dating of Early Pleistocene high lake levels of Megalake Tengger, northwestern China

Sedimentary evidence and luminescence and ESR dating of Early Pleistocene high lake levels of Megalake Tengger, northwestern China

Thermoluminescence properties and new insights on the UV-vis absorption features of colorless quartz after γ-ray irradiation

Investigation of quartz electron spin resonance residual signals in the last glacial and early Holocene fluvial deposits from the Lower Rhine

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