Guide for interpreting and reporting luminescence dating results

Mahan, Shannon A.; Rittenour, Tammy M.; Nelson, Michelle S.; Ataee, Nina; Brown, Nathan D.; DeWitt, Regina; Durcan, Julie A.; Evans, Mary; Frouin, Marine; Guérin, Guillaume; Heydari, Maryam; Huot, Sébastien; Jain, Mayank; Keen‐Zebert, Amanda; Li, Bo; López, Gloria I.; Neudorf, Christina M.; Porat, Naomi; Rodrigues, Kathleen; Sawakuchi, André Oliveira; Spencer, Joel Q.G.; Thomsen, Kristina Jørkov

doi:10.1130/b36404.1

Cited by 15 publications

(6 citation statements)

References 169 publications

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“…The age of sample 6-collected at a depth of 10.31 m from the bottom of the L 1-3 S 1 layer-was 71.5 ± 4.36 ka (D e = 277.26 ± 4.92 Gy), which was in agreement with the age (71 ka) of L 1 /S 1 boundary within the margin of error [4]. Several papers had suggested that a reliable quartz OSL D e value for loess distributed in China is around ~230 Gy (or lower than 300 Gy) and that the saturation age is around ~100 ka [9,57,58]. Two quartz samples-L 1-3 S 2 and middle S-have D e values higher than 300 Gy.…”

Section: Soil Morphological Characteristics Of the Djg Sectionsupporting

confidence: 79%

“…Later, the samples were soaked in 35% fluorosilicate for about 2-5 days and washed with warm HCl (10%) to remove the precipitated fluorides for purifying quartz grains (90-125 µm). Lastly, the purified quartz grains were fixed in the center area of the 9.7 mm diameter stainless steel discs using silicone oil to determine the equivalent dose (D e ) [57,58].…”

Section: Osl Soil Age Dating 231 Sample Preparationmentioning

confidence: 99%

“…For all samples, inductively coupled plasma mass spectrometry (ICP-MS) was used to measure the uranium (U) and thorium (Th) concentrations, and K content was determined by inductively coupled plasma optical emission spectrometry (ICP-OES) analysis [58]. The experiment was conducted at the Analysis and Testing Center of the Institute of Earth Environment, Chinese Academy of Sciences.…”

Section: Stepmentioning

confidence: 99%

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Reconstructing the Last 71 ka Paleoclimate in Northeast China by Integrating Typical Loess Sections

Li,

Brye,

Sun

et al. 2024

Quaternary

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Long-term continuous deposits and well-preserved thick loess sections are natural archives for the reconstruction of global climate change. However, the loess sections are often discontinuous owing to soil erosions and accumulations. This study aimed at reconstructing long-term continuous paleoclimatic records by integrating the target sections of two typical loess sequences in northeast (NE) China. One section, the Dajiugang (DJG) section, was investigated and sampled, and the Sanbahuo (SBH) section was used as the target for integrating and reconstructing the paleoclimate. Sedimentary, pedogenesis, and luminescence dating analyses were conducted to analyze the potentials for reconstructing the paleoclimate by integrating two typical loess sections. The results indicated that the paleoclimate records derived from the DJG section can be used to reconstruct the continuous paleoclimate of NE China by integrating them with the SBH section. The paleoclimate information inferred from the DJG section could impute paleoclimate data from 71 to 11.7 ka, which were missing in the SBH section. The paleoclimate of NE China generally consisted of three periods from 71 to 11.7 ka: cold and dry from 29 to 11.7 ka, alternately cold and warm from 57 to 29 ka, and warm and wet to cold and dry from 71 to 57 ka. Integrating the target loess sections can contribute to reconstructing regional long-term continuous paleoclimate records where discontinuous loess sequences occurred.

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Section: Soil Morphological Characteristics Of the Djg Sectionsupporting

confidence: 79%

Section: Osl Soil Age Dating 231 Sample Preparationmentioning

confidence: 99%

Section: Stepmentioning

confidence: 99%

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Reconstructing the Last 71 ka Paleoclimate in Northeast China by Integrating Typical Loess Sections

Li,

Brye,

Sun

et al. 2024

Quaternary

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“…The goodness-of-fit of the SGC can be evaluated using the In previous papers the agreement of SAR and SGC results was based on their De values ± their 2 σ standard error (e.g., Li et al, 2015a,b;Sontag-González et al, 2021). When reporting luminescence ages the 1 σ standard error is commonly used (Mahan et al, 2022). The De values had average RSEs of ~16 %, therefore the agreement within 1 σ seems inappropriate to evaluate the differences between the SAR procedure and the SGC method.…”

Section: Resultsmentioning

confidence: 99%

Testing the applicability of standardised growth curves (SGC) for chemically heterogeneous single-grain feldspars from the Atacama Desert, Chile

Maßon,

Riedesel,

Zander

et al. 2023

Preprint

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The Atacama Desert is generally considered the driest non-polar desert on Earth and is therefore an ideal study area for exploring the water and biota free endmember of Earth’s Critical Zone (ECZ). Single grain (SG) luminescence dating has successfully identified processes in the ECZ. However, SG luminescence dating of Atacama Desert feldspars is challenging and time consuming since only a small fraction of grains emits sufficient luminescence and their potassium (K) contents, needed for internal dose rate calculations, are highly variable. Here we present an adaption of the standardised growth curve (SGC) method adjusted to the conditions of Atacama Desert sediments and a correlation of single-grain geochemistry and luminescence properties. To evaluate if SGCs are suitable for our study site and to determine the influence of the K-content on our luminescence age calculations, we used a set of five samples from the Atacama Desert and five chemically and structurally different feldspar sediment extracts from various geological origins worldwide. We performed a dose recovery test (DRT) using a post-infrared infrared stimulated luminescence (pIRIR) protocol and measured nine major element concentrations, including K, on a single grain level using a scanning electron microscope (SEM) with energy-dispersive X-ray spectroscopy (EDX). The DRT dataset was then used to test the application of SGCs. The accuracy of Atacama feldspar pIRIR measurements fitted onto SGCs frequently suffers from outliers in single measurement cycles. We investigate the influence of calculating a synthetic regenerative signal (sR) for SGC fitting, to reduce the effect of outliers on individual grain measurements. Furthermore, we reduced the regenerative cycles (rc) used for our sR approach, to test if shorter protocols would result in equivalent dose (De) estimates in agreement with longer protocols. We then calculated Spearman rank correlations between the results obtained with our modified SGC and the SAR protocol, luminescence signal intensities, and the geochemical dataset. Finally, we present a new method of fitting data onto a SGC which significantly decreases measurement time, without risking the inclusion of outliers. We furthermore show that the luminescence signal intensities, the De values and their dose recovery ratios obtained with our SGC method and a SAR protocol, are independent of the sample geochemistry.

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“…Each sample was divided In the laboratory under safe light conditions for equivalent dose (D e ) and dosimetry (D r ) measurements. Quartz grains were extracted for OSL measurements following standard sample preparation techniques (see [43,44]). Organic matter and carbonates were removed using H 2 O 2 and HCl, respectively, before the 180-212 µm quartz fraction was isolated by dry sieving and density separation using a solution of sodium polytungstate at 2.70 g.cm − 3 and 2.63 g.cm − 3 .…”

Section: Methodsmentioning

confidence: 99%

Sand budget failure underlies coastal erosion on the west coast of South Africa

Woodborne,

Evans,

Murray

et al. 2024

Preprint

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Current trends in coastal erosion combined with projected climate change impacts place half of the global sandy beaches at risk of extinction. Approximately 190 million people are likely to experience coastal environmental risks by 2100, and mitigation of the risk related to coastal erosion requires insight into the underlying causes. Here we use a multi-proxy approach to determine the cause of coastal erosion on the west coast of South Africa. Erosion trends were determined using satellite analysis for a storm event in June 2017, and foredune morphology changes were measured using unmanned aerial vehicle photogrammetry following a storm in September 2023. Significant erosion was driven by intense wave energy over multiple spring tide cycles, resulting in northward sand movement. Climate change is rejected as a cause of the erosion based on optically stimulated luminescence dates that show some of the eroded sediments to be approximately 8 900 years old. Instead, the cause is thought to be the interruption of long-term sand supply. Long-term sand dynamics are seldom considered in coastal erosion vulnerability assessments, and sediment age may be a novel factor in understanding this dynamic.

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Guide for interpreting and reporting luminescence dating results

Cited by 15 publications

References 169 publications

Reconstructing the Last 71 ka Paleoclimate in Northeast China by Integrating Typical Loess Sections

Reconstructing the Last 71 ka Paleoclimate in Northeast China by Integrating Typical Loess Sections

Testing the applicability of standardised growth curves (SGC) for chemically heterogeneous single-grain feldspars from the Atacama Desert, Chile

Sand budget failure underlies coastal erosion on the west coast of South Africa

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