On the dose dependency of the bleachable and non-bleachable components of IRSL from K-feldspar: Improved procedures for luminescence dating of Quaternary sediments

Li, Bo; Jacobs, Zenobia

doi:10.1016/j.quageo.2013.03.006

Cited by 42 publications

(23 citation statements)

References 21 publications

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“…This implies that the easy-to-bleach signal component has been removed and the determined D e -values are likely representing likely the effect of slow-to-bleach components and/or thermal transfer. Similar observations have been made by Li et al (2013), who observed an increase of residuals with increasing stimulation temperature and emphasise that the residual dose associated with the nonbleachable component is highly variable from sample to sample. The results presented here confirm the first observation and further highlight that even for sediments that are usually considered as well-bleached, such as the aeolian sand derived from beach deposits of our study, the residual might be important, at least for high temperature approaches.…”

Section: Fig 4 Comparison Of Residual Doses For Different Methods Asupporting

confidence: 87%

Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia

2014

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From the bleaching experiments it is inferred that the higher values observed for post-IR IRSL at more elevated stimulation temperatures (225°C/290°C) are likely related to either thermal transfer and/or slow-to-bleach components within the signal. For the dating of the Holocene foredune sequence of Ruhnu Island, the post-IR IRSL (150°C) approach is preferred and these agree with the limited independent age control available from radiocarbon dating. Accordingly, the sequence formed between ca. 7.0 ka and 2.5 ka ago.

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Section: Fig 4 Comparison Of Residual Doses For Different Methods Asupporting

confidence: 87%

Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia

2014

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“…It has previously been reported that MET-pIRIR signals obtained at elevated temperatures (>200 C) show negligible rates of anomalous fading and, hence, require no fading correction, and that the corresponding MET-pIRIR ages are consistent with independent or quartz OSL ages for various sedimentary samples from China deposited in the last~300 ka Li, 2011, 2012). In an earlier study, however, we reported that the K-feldspars extracted from samples collected from Les Cott es exhibit a large proportion (~30%) of non-bleachable or residual signal in their MET-pIRIR signals, even after a prolonged sunlight bleach lasting several days (Li et al, 2013). We also demonstrated that the residual signal is strongly dose dependent, which may lead to large uncertainty in D e estimation (Li et al, 2013).…”

Section: Multiple-aliquot Met-pirir Results and Interpretationmentioning

confidence: 70%

“…In an earlier study, however, we reported that the K-feldspars extracted from samples collected from Les Cott es exhibit a large proportion (~30%) of non-bleachable or residual signal in their MET-pIRIR signals, even after a prolonged sunlight bleach lasting several days (Li et al, 2013). We also demonstrated that the residual signal is strongly dose dependent, which may lead to large uncertainty in D e estimation (Li et al, 2013). To overcome this problem in this study, we used a multiple-aliquot method to avoid having to make the residual dose correction (Table S3).…”

Section: Multiple-aliquot Met-pirir Results and Interpretationmentioning

confidence: 86%

“…To overcome this problem in this study, we used a multiple-aliquot method to avoid having to make the residual dose correction (Table S3). Several groups of natural aliquots (each comprised of 4e6 aliquots) of each sample were bleached using a solar simulator (Dr. H€ onle UVACUBE 400) for 2 h, which has been shown to be sufficient to remove most of the bleachable signal (Li et al, 2013). Each group was then given a different regenerative dose and preheated at 300 C for 60 s, followed by successive MET-pIRIR measurements at 50, 100, 150, 200 and 250 C to stimulate regenerative MET-pIRIR signals (L x ).…”

Section: Multiple-aliquot Met-pirir Results and Interpretationmentioning

confidence: 99%

“…We chose to use the MET-pIRIR method (see discussion below). The major drawback of pIRIR signals is that they are less sensitive to sunlight compared to the conventional IRSL signal or the OSL signal in quartz, and a residual signal is often observed even after an extended bleach (e.g., Li et al, 2013). Given the different signal sensitivities to light exposure, should the quartz and feldspar ages agree then adequate bleaching of the grains during sediment transport prior to burial is demonstrated.…”

Section: Optical Datingmentioning

confidence: 99%

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Testing of a single grain OSL chronology across the Middle to Upper Palaeolithic transition at Les Cottés (France)

Jacobs

Jankowski

et al. 2015

Journal of Archaeological Science

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a b s t r a c tThe timing of the Middle Palaeolithic to Upper Palaeolithic transition in France is important to help understand when, where and how Neanderthals have been replaced by Homo sapiens. Radiocarbon dating has been the dating workhorse in constructing the chronological framework pertinent to these questions. In this study, we are testing whether single grain OSL dating has the accuracy and precision to be useful as a complementary dating method. The site of Les Cott es provides an ideal testing ground because of its stratigraphic integrity and reliable radiocarbon chronology. We applied single grain OSL dating of quartz to 19 samples and multi-aliquot MET-pIRIR dating of potassium-rich feldspar grains to 5 samples to explicitly test assumptions of pre-depositional resetting of the OSL signal and postdepositional exposure to variable beta dose rates. The good agreement between the single grain OSL and the multi-aliquot MET pIRIR ages suggest that the optical signals of both quartz and feldspar grains were reset prior to deposition and that much of the extra scatter observed in the equivalent dose distribution of quartz grains are likely due to the small-scale differences in beta dose delivered to individual grains. Both the quartz OSL and feldspar MET-pIRIR ages show great consistency with the 14 C ages on bone collected from the same units. This gives confidence in the measurement and analytical approaches used to derive both the equivalent dose and dose rate, the numerator and denominator, respectively, of the luminescence age equation. These results suggest that a systematic and detailed single grain OSL dating study can have the accuracy and precision that is necessary to play a powerful role in the dating of the Middle and Upper Palaeolithic transition and other questions of importance in this time range and geographical area.

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Optical dating of loessic hillslope sediments constrains timing of prehistoric rockfalls, Christchurch, New Zealand

Sohbati

Borella

Murray

et al. 2016

J Quaternary Science

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Developing a robust chronology for mass-movement events is of crucial importance to understanding triggering mechanisms and assessing hazards. We constrain the emplacement time of four palaeorockfall boulders near Christchurch, New Zealand, using optically stimulated luminescence (OSL) of quartz and infrared stimulated luminescence dating (IRSL) of K-feldspar from colluvial loess deposits underlying and upslope of individual boulders. The quartz OSL and K-feldspar pIRIR 290 ages are all consistent with the stratigraphy and in excellent agreement with each other, indicating that all the boulders that overlie the in-situ loess and oldest loess colluvium unit must have been emplaced < 13 ka ago. A comparison of luminescence ages with cosmogenic 3 He surface-exposure ages from the surfaces of each boulder shows that two out of four boulders contain pre-deposition 3 He inheritance.Overall, the optical ages are consistent with both a prehistoric rockfall event at ~8-6 ka and a possible preceding event at ~14-13 ka, although the temporal resolution of the time of emplacement of individual boulders is ca. 3-5 ka. This resolution is not limited by age uncertainties but rather by the stratigraphy. This study is the first to show a successful application of luminescence dating to New

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On the dose dependency of the bleachable and non-bleachable components of IRSL from K-feldspar: Improved procedures for luminescence dating of Quaternary sediments

Cited by 42 publications

References 21 publications

Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia

Comparing different post-IR IRSL approaches for the dating of Holocene coastal foredunes from Ruhnu Island, Estonia

Testing of a single grain OSL chronology across the Middle to Upper Palaeolithic transition at Les Cottés (France)

Optical dating of loessic hillslope sediments constrains timing of prehistoric rockfalls, Christchurch, New Zealand

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