Extending the age limit of luminescence dating using the dose-dependent sensitivity of MET-pIRIR signals from K-feldspar

Li, Bo; Jacobs, Zenobia; Roberts, Richard G.; Li, Sheng‐Hua

doi:10.1016/j.quageo.2013.02.003

Cited by 55 publications

(44 citation statements)

References 46 publications

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“…Richardson, 1994;Li et al, 2013b). In this study, sensitivity decrease is observed for METpIRIR signals for both WB and PB.…”

Section: Fig 4 Sensitivity Changes Of Wb and Pb As Function Of Measmentioning

confidence: 47%

Residual doses and sensitivity change of post IR IRSL signals from potassium feldspar under different bleaching conditions

Chen

2013

Geochronometria

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Abstract:The residual doses and sensitivity change for potassium-rich feldspar (K-feldspar) have been studied using the post-infrared infrared stimulated luminescence (pIRIR) and multi-elevatedtemperature post-IR IRSL (MET-pIRIR) protocols. Laboratory simulated poorly-bleached and wellbleached samples were those K-feldspar grains bleached using a solar simulator for 10 minutes and 8 hours, respectively. The residual doses rise with stimulation temperature and time. The poorlybleached sample has larger residual doses than the well-bleached sample, especially at high stimulation temperatures. The high-temperature pIRIR signals contain a large amount of hard-to-bleach signals. A decrease of luminescence sensitivity was observed after conducting a high-temperaturetreatment in the measurement cycles. The sensitivity decreases significantly between the first and the second cycle. The extent of decrease in sensitivity shows a clear temperature trend. The higher the stimulation temperature of pIRIR signals is, the larger the sensitivity decreases. This decrease is more severe for the poorly-bleached sample than for the well-bleached sample, and could possibly lead to problems in sensitivity correction.

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“…Richardson, 1994;Li et al, 2013b). In this study, sensitivity decrease is observed for METpIRIR signals for both WB and PB.…”

Section: Fig 4 Sensitivity Changes Of Wb and Pb As Function Of Measmentioning

confidence: 47%

Residual doses and sensitivity change of post IR IRSL signals from potassium feldspar under different bleaching conditions

Chen

2013

Geochronometria

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“…D e values were obtained by projecting natural signal (L n /T1 n , L n /T2 and T1 n /T2) onto each of 164 these DRCs. Li et al (2013b) found that all three yielded consistent D e values for their samples, but 165 that T1/T2 and L x /T2 saturate at much higher doses and, hence, can be used to date older samples. 166…”

Section: The Multiple-aliquot Pre-dose Met-pirir Procedures 145mentioning

confidence: 92%

“…In our previous study (Li et al, 2013b), we proposed a multiple-aliquot regenerative-dose 146 (MAR) procedure for determining ages using the dose-dependent sensitivities of the feldspar IRSL 147 signals as a practical method to extend the dating range of feldspars. In this MAR method, the 148 samples were divided into several groups of aliquots, each consisting of 4-6 aliquots.…”

Section: The Multiple-aliquot Pre-dose Met-pirir Procedures 145mentioning

confidence: 99%

“…One group was 149 used to measure the natural signals, and the other groups were bleached using a Dr Hönle solar 150 simulator (model: UVACUBE 400) for 2 hr and then given different regenerative doses. We showed 151 that a 2 hr bleach by the solar simulator was sufficient to reset the MET-pIRIR signals and their 152 sensitivities to a stable level (Li et al, 2013b). These aliquots were then measured using the MAR 153 procedure shown in Table 2a.…”

Section: The Multiple-aliquot Pre-dose Met-pirir Procedures 145mentioning

confidence: 99%

“…The T2 signals are important because the 600 °C heating in step 15 158 erases the pre-dose memory and sensitivity information (Li et al, 2013b). Thus, T2 is independent of 159 the pre-dose received, so these signals were used to normalise for inter-aliquot variations, which is a 160…”

Section: The Multiple-aliquot Pre-dose Met-pirir Procedures 145mentioning

confidence: 99%

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A single-aliquot luminescence dating procedure for K-feldspar based on the dose-dependent MET-pIRIR signal sensitivity

Li¹,

Roberts²,

Jacobs³

et al. 2014

Quaternary Geochronology

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It has been shown previously that the 'sensitivity' of the post-infrared infrared stimulated luminescence (post-IR IRSL or pIRIR) signal-that is, the intensity of the test dose signal (Tx)-can retain a 'memory' of the pre-dose received in nature, but can be reset by sunlight bleaching. Based on this observation, we describe here a single-aliquot regenerative-dose (SAR) multiple elevated temperature (MET) pIRIR dating procedure for K-feldspar that differs in one important respect from the conventional SAR MET-pIRIR procedure. Instead of using a high temperature IR bleaching step between each SAR cycle-as in the conventional procedure-our modified procedure uses a solar simulator bleach for 2 h to reset the dose-dependent pIRIR signal sensitivity before each regenerative SAR cycle. We show that the De can be obtained directly from either the Tx signal or the sensitivity-uncorrected signal (Lx) using the modified procedure. Both of these signals saturate at a higher dose than the sensitivity-corrected signal (Lx/Tx) and, hence, can be used to date older sediments than is feasible using conventional IRSL or pIRIR methods. We have tested our new procedure on 10 sediment samples from different regions of Europe (France and Italy) and Asia (China, Georgia and India), including samples with independently known ages of between ∼48 and ∼470 ka. Based on these external comparisons of age, and on internal (dose recovery) validation tests of the performance of this new pre-dose MET-pIRIR (or pMET-pIRIR) SAR procedure, we conclude that it can potentially measure natural doses of up to ∼1500 Gy in K-feldspar and produce reliable ages for Late and Middle Pleistocene sediments.

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Quartz OSL dating of palaeosols intercalated with basaltic lava flows and scoria deposits from monogenetic volcanoes in northeastern Jeju Island, Korea

Yeo

Choi

Ahn³

et al. 2019

Geosci J

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Extending the age limit of luminescence dating using the dose-dependent sensitivity of MET-pIRIR signals from K-feldspar

Cited by 55 publications

References 46 publications

Residual doses and sensitivity change of post IR IRSL signals from potassium feldspar under different bleaching conditions

Residual doses and sensitivity change of post IR IRSL signals from potassium feldspar under different bleaching conditions

A single-aliquot luminescence dating procedure for K-feldspar based on the dose-dependent MET-pIRIR signal sensitivity

Quartz OSL dating of palaeosols intercalated with basaltic lava flows and scoria deposits from monogenetic volcanoes in northeastern Jeju Island, Korea

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