Luminescence dating of old (&gt;70 ka) Chinese loess: A comparison of single-aliquot OSL and IRSL techniques

Buylaert, Jan‐Pieter; Vandenberghe, Dimitri; Murray, Andrew; Huot, Sébastien; Corte, F. De; haute, Peter Van den

doi:10.1016/j.quageo.2006.05.028

Cited by 184 publications

(103 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason for the underestimation should be related to anomalous fading of feldspars. For loess samples from the Chinese Loess Plateau, Buylaert et al (2007) observed anomalous fading in every sample examined, and the overall average value of g 2days for their samples is 3.10±0.13% per decade. For quartz BLSL, the contamination of feldspars will inevitably lead to D e , and thus age, underestimation, even if an IR treatment is involved in order to reduce the influence of feldspars.…”

Section: Effects On D E Valuesmentioning

confidence: 85%

Effects of Feldspar Contamination on Equivalent dose and the Shape of Growth Curve for OSL of Silt-Sized Quartz Extracted from Chinese Loess

Lai¹,

Brückner

2008

Geochronometria

110

View full text Add to dashboard Cite

This study examines the effects of feldspar contamination of different extent (by fluorosilicic acid etching for different time periods and mixing pure quartz with different percentage of unetched grains) on blue-light stimulated luminescence (BLSL) of quartz (38-63 µm) for Chinese loess. In particular, the D e values and the shape of growth curves will be examined. The results show that:(1) The D e determined using feldspar in Chinese loess is obviously underestimated, and infra-red stimulated luminescence (IRSL) has a greater underestimation than BLSL. For aliquots with no fluorosilicic acid etching, an IRSL D e underestimation of ~30% is observed for a sample with an expected age of ~22 ka, ~19% underestimation for BLSL, and ~10% for post-IR BLSL. For quartz BLSL, the contamination of feldspar, which has not dissolved by fluorosilicic acid etching, will inevitably lead to age underestimation. We suggest that the IR-checking should be performed for every single aliquot. An aliquot should be excluded from the final D e calculation if obvious IRSL signal was observed. (2) For the sample under examination blue LED stimulation can reset both IRSL and BLSL signals of feldspars, while IR stimulation cannot reset the BLSL of feldspars. (3) For multiple-mineral aliquot the growth curve shape of the post-IR BLSL is different from that of the IRSL, and within 25 Gy it is identical to that of the pure quartz BLSL. The contamination of feldspars in quartz will change the shape of a growth curve for quartz BLSL.

show abstract

Section: Effects On D E Valuesmentioning

confidence: 85%

Effects of Feldspar Contamination on Equivalent dose and the Shape of Growth Curve for OSL of Silt-Sized Quartz Extracted from Chinese Loess

Lai¹,

Brückner

2008

Geochronometria

110

View full text Add to dashboard Cite

show abstract

“…Unfortunately Chinese loess (dust) may not contain sufficient coarse quartz grains (at least in the sand fraction), and the isolation of fine-grained quartz is time-consuming (Roberts and Wintle, 2001;Roberts, 2008). In addition, the quartz OSL signal has a limited dose range; because of the high dose rate in loess, quartz cannot usually be used to date older than ~50 ka (D e >~150 Gy; Buylaert et al, 2007;2008). Polymineral fine-grains are very easily prepared and are commonly used with infrared (IR) stimulation and a blue detection window to date loessic sedi-ments (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…It has also been shown that the loess infrared stimulated luminescence (IRSL) signal grows to much higher doses than does the OSL from quartz (e.g. Buylaert et al, 2007). However, the luminescence behaviour (such as bleachability, anomalous fading, and sensitivity change) of polymineral finegrains is not yet well understood, and their reliability for dating remains to be established (Roberts, 2008;Roberts and Wintle, 2003).…”

Section: Introductionmentioning

confidence: 99%

IRSL and post-IR IRSL residual doses recorded in modern dust samples from the Chinese Loess Plateau

et al. 2011

View full text Add to dashboard Cite

Using a set of modern/young (0 to about 200 years old) dust samples collected from the Chinese Loess Plateau the bleachability of IRSL measured at 50°C (IR 50 ) and post-IR 50 elevated temperature IRSL (measured at 225°C and at 290°C) is investigated by measuring the apparent (residual) doses recorded by these signals. Doses recorded by quartz OSL are used as a reference. Allowing for differences in dose rates it seems that both IRSL and post-IR IRSL signals yield residual doses that are significantly larger than the doses measured in quartz. These residual doses can be largely explained by thermal transfer caused by preheating. Nevertheless, we advise against the use of a low temperature preheat (<200°C) with IR 50 to date loess samples because, as has been reported before, the signal appears to be thermally unstable. In general, we conclude that it may not be advisable to apply post-IR IRSL dating to Chinese loess samples where residuals of up to ~20 Gy are a significant fraction of the total dose. However, these residuals quickly become unimportant when dating older samples, and this is the age range in which post-IR IRSL dating is likely to be most useful.

show abstract

“…However, the quartz OSL signal saturates at relatively low doses and has made it difficult to use quartz for dating beyond (roughly) 70 thousand years (70 ka), unless the environmental dose rate is exceptionally low. In addition to that, underestimation in quartz OSL ages for old samples has been reported in the Chinese Loess Plateau (Buylaert et al, 2007;Lu et al, 2007;Qin and Zhou, 2009;Lai, 2010) and its northern margin area (Li and Li, 2006;Fan et al 2011). Fan et al (2011 found a ~50% underestimation in quartz OSL age using the single-aliquot regeneration (SAR) protocol for a ~55 ka sample extracted from a sedimentary layer containing stone tools from the bank of Salawusu River, Mu Us desert in central China.…”

Section: Introductionmentioning

confidence: 98%

Isochron dating of sand-loess-soil deposits from the Mu Us Desert margin, central China

Sun

2011

Quaternary Geochronology

View full text Add to dashboard Cite

A sand-loess-soil sequence from the margin of the Mu Us Desert was studied using the isochron infrared stimulated luminescence (IRSL) dating method utilizing K-feldspar grains extracted from sediments. Although the IRSL ages measured with the conventional method showed underestimation as a result of anomalous fading, the isochron results are broadly consistent with independent ages based on stratigraphic correlation in a glacial/interglacial scale over the last 250 ka. For samples older than 250 ka, the IRSL signals approached in field saturation and the isochron dating gave ambiguous results, suggesting an age limit for the method. AbstractA sand-loess-soil sequence from the margin of the Mu Us Desert was studied using the isochron infrared stimulated luminescence (IRSL) dating method utilizing K-feldspar grains extracted from sediments. Although the IRSL ages measured with the conventional method showed underestimation as a result of anomalous fading, the isochron results are broadly consistent with independent ages based on stratigraphical correlation in a glacial/interglacial scale over the last 250 ka. For samples older than 250 ka, the IRSL signals approached in field saturation and the isochron dating gave ambiguous results, suggesting an age limit for the method.

show abstract

Luminescence dating of old (>70 ka) Chinese loess: A comparison of single-aliquot OSL and IRSL techniques

Cited by 184 publications

References 23 publications

Effects of Feldspar Contamination on Equivalent dose and the Shape of Growth Curve for OSL of Silt-Sized Quartz Extracted from Chinese Loess

Effects of Feldspar Contamination on Equivalent dose and the Shape of Growth Curve for OSL of Silt-Sized Quartz Extracted from Chinese Loess

IRSL and post-IR IRSL residual doses recorded in modern dust samples from the Chinese Loess Plateau

Isochron dating of sand-loess-soil deposits from the Mu Us Desert margin, central China

Contact Info

Product

Resources

About