Quaternary Geochronology最新文献

{"title":"Radiocarbon age anomalies in post-impact lake sediments of the Hapcheon impact crater, Korea and their implication for crater evolution","authors":"Jaesoo Lim ,&nbsp;Sangheon Yi ,&nbsp;Sujeong Park ,&nbsp;Arum Jung ,&nbsp;Youngeun Kim ,&nbsp;Sung Won Kim","doi":"10.1016/j.quageo.2024.101649","DOIUrl":"10.1016/j.quageo.2024.101649","url":null,"abstract":"<div><div>Impact craters caused by meteorite collisions are phenomena that dramatically alter the Earth's surface and disturb the natural carbon cycle in subsequent sedimentary environments. To determine the impact date and impact-driven old carbon effects on radiocarbon cycles recorded in post-impact lake sediments, we performed radiocarbon (¹⁴C) dating of various organic fractions (humic acids, humins, charcoal, and organic plant fragments of various sizes) in post-impact lake sediments of the Hapcheon impact crater, Korea. Charcoal and plant fragments larger than 500 μm in the post-impact lake sediments of core 20CR09 constituted the oldest fraction (&gt;45,000 cal BP), indicating pre-impact ages. Compared to micro-organic fragments (10–100 μm) consisting of terrestrial plant tissues, pollen, and limited freshwater algae with a narrow age range of 39,300–42,300 cal BP, the 100–500-μm plant fragments showed a slightly older age range of 41,670–43,910 cal BP throughout the 33-m-long lake sediment core. This suggests significant influence of well-mixed syn-impact organic fragments transported from slope deposits consisting of impact breccias and fallback deposits. Humin ages in the lake sediment of core 20CR05 were similar to those of the micro-plant fragments in core 20CR09, indicating that the humin fraction is mainly allochthonous. Humic acids at a depth of ca. 71 m, corresponding to the lowermost post-impact lake sediments (Stage 1), were dated to ∼21,000 cal BP, showing strong influence of post-impact humic acids ages. Whereas those from mid-depth lake sediments (Stage 2) were dated to 35,000–43,000 cal BP. This age reversal indicates increased input of syn-impact allochthonous humic acids, supported by positive correlation with terrestrial mineral input. This study demonstrated significant syn-impact radiocarbon effects and resultant age reversals in post-impact early lake sediments. The syn-impact age may be estimated by comparing ages of different-sized plant fragments (e.g., 10–100, 100–500, and &gt;500 μm), humin, and humic acids. These findings suggest that climatic and environmental interpretations of these post-impact early lake sediments should be conducted only after testing various organic materials, if radiocarbon dating is applied. Lastly, compared to surrounding areas following natural climate changes, post-impact early lake environments in impact craters must be considered as anomalies with different ecosystems due to hydrothermal activity.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"86 ","pages":"Article 101649"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A new tephrochronological record of a raised bog in eastern lowland Scotland","authors":"Li Wang ,&nbsp;Katherine H. Roucoux ,&nbsp;Althea L. Davies ,&nbsp;Shuang Zhang ,&nbsp;Chunqing Sun ,&nbsp;Richard T. Streeter ,&nbsp;William Hutchison ,&nbsp;Ian T. Lawson","doi":"10.1016/j.quageo.2024.101647","DOIUrl":"10.1016/j.quageo.2024.101647","url":null,"abstract":"<div><div>Cryptotephras have been widely used as a chronological tool for studying past environmental change, but many temporal and spatial gaps remain in our knowledge of the distribution of cryptotephra records. Here, last millennium cryptotephras were identified and analysed for the first time in eastern lowland Scotland. Six tephra layers were identified in six replicate short peat cores at Bankhead Moss, a raised bog in Fife, eastern lowland Scotland. Geochemical and stratigraphic correlations indicate that the tephras originate from Icelandic and Alaskan sources. We make firm correlations to Askja 1875 and WRAe, a broad correlation to Mount Churchill with the possibility of Lena tephra being inferred from its estimated timing, and uncertain correlations of three tephra layers of Icelandic origin, considering the mixed nature of these three tephra layers under the potential influence from post-depositional reworking and multiple volcanic sources, e.g. Hekla, Öræfajökull and Katla. This is the first secure record of the Askja 1875 tephra in the British Isles, which significantly extends its known spatial distribution and suggests a more complex dispersal pattern of this tephra than previously thought. Persistent presence of shards throughout parts of the peat sequences may reflect post-depositional movement of tephra shards within the peat, reworking from surrounding landscape, and/or sparse fallout from other eruptions. Our records indicate that any single peat core from this site gives a good approximation of the overall tephrostratigraphy, but there is considerable spatial variation in tephra concentrations between cores. Age-depth models for the six cores based on cryptotephras, spheroidal carbonaceous particle (SCP) counts, and radiocarbon dates likewise vary between cores, showing a pattern consistent with peat accumulation in a domed raised bog. These spatial differences in tephrostratigraphy highlight the value of a multiple-core approach in palaeoenvironmental peatland research.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"86 ","pages":"Article 101647"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Combined single grain and cobble luminescence dating of poorly bleached glaciofluvial deposits from the Swiss Alpine foreland","authors":"Elena Serra ,&nbsp;Daniela Mueller ,&nbsp;Lukas Gegg ,&nbsp;Gustav Firla ,&nbsp;Francesca Piccoli ,&nbsp;Stefan Hergarten ,&nbsp;Audrey Margirier ,&nbsp;Frank Preusser","doi":"10.1016/j.quageo.2025.101650","DOIUrl":"10.1016/j.quageo.2025.101650","url":null,"abstract":"<div><div>Constraining the age of glaciofluvial deposits is essential for reconstructing paleoglacial dynamics. While luminescence dating is among the most commonly used approaches, incomplete resetting of the signal before sediment deposition makes its application to such deposits challenging. Single grain (SG) and cobble luminescence dating have been used to account for heterogeneous bleaching with different success, and are tested here in combination on glaciofluvial deposits from one site in the northern Alpine foreland. Previous chronological investigations indicate that deposition of the proglacial outwash occurred ca. 29 ka ago. SG feldspar results on sand lens and gravel sandy matrix samples underestimate the previous age estimates due to the occurrence of grains with low equivalent dose (D_e) values. When low D_e values are discarded, the estimated ages are in agreement with the independent constraints. Luminescence-depth profiles obtained from four cobbles show (1) no or only shallow bleaching, and (2) high variability between cores and surfaces of the same clast. Both aspects highlight the necessity of measuring numerous clasts and several cores in order to detect well-bleached clasts and profiles. The limited signal resetting can be explained by the proximity of the deposit to the glacial front. The intra-cobble variability is instead potentially related to heterogeneity in the cobbles’ lithology, implying differences in dosimetry, signal stability and light attenuation within the clasts. Electron microprobe analyses of feldspar in the clasts and comparison with the independent age constraints suggest that (1) the luminescence signal of the rock slices derive from both Na- and K-rich feldspars and (2) an average internal potassium content may be a good first order estimate for dose rate calculations. Overall, the present study highlights both the challenges and the potential of applying SG and cobble luminescence dating to partially bleached glaciofluvial deposits.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"87 ","pages":"Article 101650"},"PeriodicalIF":1.7,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Survival of the brightest? pIRIR dating of volcanic sediments in Sulawesi, Indonesia, using micro-aliquots of K-rich feldspar","authors":"Mariana Sontag-González ,&nbsp;Bo Li ,&nbsp;Kieran O'Gorman ,&nbsp;Basran Burhan ,&nbsp;Budianto Hakim ,&nbsp;Adam Brumm ,&nbsp;Richard G. Roberts","doi":"10.1016/j.quageo.2024.101638","DOIUrl":"10.1016/j.quageo.2024.101638","url":null,"abstract":"<div><div>Volcanic sediments are challenging to date with luminescence-based methods. Both main minerals used for dating—quartz and K-rich feldspar—commonly have suboptimal luminescence properties when of volcanic origins, primarily a low signal intensity and, for K-rich feldspars, high rates of anomalous fading. The present work provides a case study of sediment samples from the Leang Bulu Bettue (LBB) archaeological site in Indonesia, a key site in our understanding of the early human occupation of the island of Sulawesi. We show that currently available state-of-the-art methods can provide robust optical ages for volcanic sediments. Through various reliability tests, we establish the suitability of a post-IR IR stimulated luminescence (pIRIR) standardised growth curve (SGC) procedure for D_e estimation of ‘micro-aliquots’ containing 5–10 grains of K-rich feldspar, and then combine this method with estimates of environmental dose rate to determine 10 new reliable and finite optical ages for the sedimentary deposits at LBB. Furthermore, by applying the L_nT_n method to circumvent truncation of the D_e distribution caused by the non-linearity of the dose response curve in the higher dose range, we could extend the site's luminescence-based chronology to span the interval ∼15–210 ka. The new chronology is in keeping with previous radiocarbon and U-series ages for the site's upper layers. We show that the low fading rate of micro-aliquots relative to using large aliquots composed of hundreds of grains lies in a brightness-based selection. By targeting bright grains with low fading rates, the need for fading corrections is greatly reduced and they can be made with a smaller uncertainty propagated through into the final age estimate, resulting in optical ages of improved accuracy and precision for volcanic sediments.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101638"},"PeriodicalIF":1.7,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of multiple-centers ESR dating to middle Pleistocene fluviolacustrine sediments and insights into the dose underestimation from the Ti–H center at high equivalent doses","authors":"Xingshuo Xu ,&nbsp;Chuanyi Wei ,&nbsp;Gongming Yin ,&nbsp;Hao Ji ,&nbsp;Chunru Liu ,&nbsp;Lin Zhao ,&nbsp;Huili Yang ,&nbsp;Guang Yang","doi":"10.1016/j.quageo.2024.101635","DOIUrl":"10.1016/j.quageo.2024.101635","url":null,"abstract":"<div><div>The Ti–H center exhibits rapid and complete optical bleaching properties, meaning it has significant potential for dating applications. However, the equivalent dose of Ti–H centers is underestimated when total doses received by quartz during its geological history reaches a higher level, and there appears to be linked to saturation of the equivalent dose obtained from Ti–H centers. To investigate this phenomenon, a series of samples were analyzed from two sections at Ximachi in Heqing County, China, which have strong Ti–H signals. The sample ages were obtained using the electron spin resonance (ESR) multiple-centers approach, and the reliability of the ages was validated by comparison with optically simulated luminescence (OSL) ages and between different paramagnetic centers. The ESR data demonstrate that the Ti–H centers can provide accurate dose estimates up to 750–950 Gy, with varying degrees of underestimation at high doses. Combined with previously published Ti–H data, it is evident that the upper threshold of the accurate data obtained from Ti–H centers depends on the sample, and may be positively correlated with the Ti–H/(Ti–Li + Ti–H) ratio (option C/D). According to the provenance significance of the Ti–H/(Ti–Li + Ti–H) ratio, we propose that the Ximachi samples have high Ti–H/(Ti–Li + Ti–H) ratios and then equivalent dose saturation values of Ti–H centers, which may be related to the thermal history of the analyzed quartz grains.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101635"},"PeriodicalIF":1.7,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142552476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A method to date rock engravings using luminescence – tested at Murujuga, Western Australia","authors":"Luke A. Gliganic ,&nbsp;Jo McDonald ,&nbsp;Caroline Mather ,&nbsp;Lloyd T. White","doi":"10.1016/j.quageo.2024.101633","DOIUrl":"10.1016/j.quageo.2024.101633","url":null,"abstract":"<div><div>Rock engravings are globally ubiquitous, provide evidence for symbolic behaviours, and demonstrate connections to country and the desire to communicate with other humans. However, rock engravings have proven difficult to date. The development of luminescence rock surface dating approaches has the potential to address this deficiency in applicable dating techniques. Specifically, luminescence rock surface exposure dating methods can be used to tell how long a rock surface has been exposed to sunlight, thus providing a potential avenue to date rock engravings. Here, we present results from laboratory and field bleaching experiments from the Murujuga rock art complex in Western Australia. Four major art-bearing lithologies are petrographically characterised and tested for useable luminescence signals. Three bleaching experiments are conducted: two in the laboratory and one at the study area. The gabbro and microgranite lithologies are shown to be bleachable and show potential for rock surface burial dating. The microgranite can be used to accurately estimate exposure duration over the timescales tested in all experiments, demonstrating promising potential to date rock engravings.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101633"},"PeriodicalIF":1.7,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analyzing complex single grain feldspar equivalent dose distributions for luminescence dating of glacially derived sediments","authors":"Gustav Firla ,&nbsp;Christopher Lüthgens ,&nbsp;Stephanie Neuhuber ,&nbsp;Clemens Schmalfuss ,&nbsp;Ernst Kroemer ,&nbsp;Frank Preusser ,&nbsp;Markus Fiebig","doi":"10.1016/j.quageo.2024.101627","DOIUrl":"10.1016/j.quageo.2024.101627","url":null,"abstract":"<div><div>Overdeepened valleys are structures scoured into the underlying substrate by glaciers that have been subsequently filled with sediment, which recorded the environmental history of the adjacent landscape. Investigated here is an overdeepened structure that was formed beneath the Salzach Paleoglacier west of Freilassing, Bavaria (southern Germany). In a previous study, infinite infrared stimulated luminescence (IRSL) ages have been determined for the lower part of the core using a multi-grain approach. Applying single-grain feldspar luminescence dating allows to identify the unsaturated signals, previously masked by multi-grain signal averaging. Identification of the normally distributed leading edge in equivalent dose (D_e) distributions allows for the dismissal of low value D_e (LOVED) grains that appear to reflect underestimating outliers. Measurement of eleven samples distributed along the entire length of the core yielded two distinct age clusters, for which fading corrected IRSL₅₀ and uncorrected pIRIR₂₂₅ ages agree within uncertainties. Whereas the younger age cluster at the top of the sequence is attributed to Marine Isotope Stage (MIS) 3, the older age cluster is assigned to MIS 6. It is shown that single grain pIRIR measurements will allow to resolve the infill chronology of overdeepened structures in the Alps, at least for the last ca. 200 ka. Overall, the present study represents a further step towards understanding and handling complex D_e distributions often encountered in single grain feldspar luminescence dating. This contributes to better understand the frequently observed age offset between single grain and single-aliquot measurements.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101627"},"PeriodicalIF":1.7,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142428163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Luminescence dating of rock surfaces in challenging environments: The case of MIS5e gravelly transgressive lag deposit (Southern Sardinia, West Mediterranean Sea)","authors":"Giulia Cossu ,&nbsp;Daniele Sechi ,&nbsp;Reza Sohbati ,&nbsp;Andrew Murray ,&nbsp;Vincenzo Pascucci ,&nbsp;Stefano Andreucci","doi":"10.1016/j.quageo.2024.101630","DOIUrl":"10.1016/j.quageo.2024.101630","url":null,"abstract":"<div><div>Determining the age of precise sea level markers such as marine terraces is often difficult because of the inherent limitation of traditional dating methods. A novel method based on Optical Stimulated Luminescence applicable to rock surfaces has been showing great promise in dating boulder and cobble surfaces from various environments. We performed Optically Stimulated Luminescence Rock Surface Dating (OSL RSD) on five cobbles from a basal transgressive lag deposit sealing a marine terrace referred to as the Last Interglacial (Marine Isotopic Stage 5e). We applied a consistent and highly selective 3-step acceptance criteria on five cobbles and obtained that only one was sufficiently well-bleached prior to burial. The resulting ages of 131 ± 8 ka and 127 ± 8 ka (obtained on 22 analyzed aliquots, n = 22) derived from the post-infrared infrared stimulated signal at 225^oC (pIRIR₂₂₅) and the preceding infrared stimulated signal at 50^oC (pIR_50/225), respectively, are consistent with each other as well as with the conventional luminescence age of ∼135 ka from the same sequence and with the U/Th age of ∼130 ka obtained from coral fragments. This work demonstrates that the RSD is a promising method for dating gravel veneer deposits overlaying marine terraces, enabling new chronologies for similar Quaternary deposits.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101630"},"PeriodicalIF":1.7,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isothermal thermoluminescence dating of speleothem growth – A case study from Bleßberg cave 2, Germany","authors":"Junjie Zhang ,&nbsp;Jennifer Klose ,&nbsp;Denis Scholz ,&nbsp;Norbert Marwan ,&nbsp;Sebastian F.M. Breitenbach ,&nbsp;Lutz Katzschmann ,&nbsp;Dennis Kraemer ,&nbsp;Sumiko Tsukamoto","doi":"10.1016/j.quageo.2024.101628","DOIUrl":"10.1016/j.quageo.2024.101628","url":null,"abstract":"<div><div>Speleothems are a key archive of past climatic and environmental changes. ²³⁰Th/U dating is the most commonly used method to determine speleothem ages. However, incorporation of non-radiogenic thorium may hamper ²³⁰Th/U dating, and samples older than 600 ka also remain out-of-reach. Calcite exhibits a thermoluminescence (TL) signal at 280 °C with a high characteristic saturation dose, and provides significant potential to date carbonate samples over several million years. Hitherto, the application of TL dating for calcite has mainly been hindered by two factors: 1) a spurious TL signal occurring in the high temperature range, and 2) non-uniform dose rate due to U-series disequilibrium. Here we test an isothermal TL (ITL) dating method on a speleothem sample from Bleßberg cave 2, Germany. We show that the ITL signal measured at 240 °C can completely remove the 280 °C TL peak with a negligible TL contribution from the higher temperature range, thus reducing the influence from the spurious signal. The time-dependent dose rate variation can be simulated using the initial radioactivity of ²³⁸U, ²³⁴U, ²³⁰Th and their decay constants. We use the ²³⁰Th/U dating method to provide precise and accurate radiometric ages documenting that the speleothem grew between 425.5 ± 5.4 and 320.5 ± 9.7 ka. The ITL ages (421 ± 23 to 311 ± 23 ka) of four subsamples from the speleothem are consistent with the ²³⁰Th/U ages at isochronous sampling positions, showing the general reliability of the ITL dating method. ITL dating provides a pathway to construct chronologies for palaeoclimate reconstructions for speleothems beyond the range of the ²³⁰Th/U-method and for samples that are unsuitable for U-series dating methods.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101628"},"PeriodicalIF":1.7,"publicationDate":"2024-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142358951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single grain K-feldspar MET-IRSL sediment transport determination: Bleaching patterns and rates","authors":"Edward J. Rhodes ,&nbsp;Tessa M.C. Spano ,&nbsp;Rebecca A. Hodge ,&nbsp;André O. Sawakuchi ,&nbsp;Dailson J. Bertassoli Jr.","doi":"10.1016/j.quageo.2024.101626","DOIUrl":"10.1016/j.quageo.2024.101626","url":null,"abstract":"<div><div>This paper describes ways that Infra-Red Stimulated Luminescence (IRSL) signals from K-feldspar grains can be used to determine patterns and rates of sediment transport. In particular, it focusses on the potential provided by single grains to reveal their individual exposure and burial histories by the application of multiple elevated temperature (MET) IRSL measurements. We examine similarities and differences in bleaching behaviour with different light sources and introduce the concept of an equilibrium bleach. We present data on the variability of bleaching parameters for grains from single sediment samples, and discuss different analysis approaches to best determine individual grain histories. We describe a single grain “bleach recovery” experiment, and the application of a combined growth-bleach protocol designed to allow optimal data collection of both aspects of grain behaviour. We discuss the development of a burial-bleach model using numerical simulations based on direct observations of sample characteristics.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101626"},"PeriodicalIF":1.7,"publicationDate":"2024-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142318618","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}