Quaternary Geochronology最新文献

{"title":"An evaluation of two cryptotephra quantification methods applied on lacustrine sediments with distant Laacher See tephra fallout","authors":"V. Meier ,&nbsp;T. Hrstka ,&nbsp;J. Ohser ,&nbsp;J. Siquans ,&nbsp;B. Brandstätter ,&nbsp;G. Kletetschka ,&nbsp;D. Vondrák","doi":"10.1016/j.quageo.2025.101670","DOIUrl":"10.1016/j.quageo.2025.101670","url":null,"abstract":"<div><div>Detailed quantification of volcanic glass is crucial for improving the resolution of paleoenvironmental reconstructions and facilitating more accurate comparisons between distant sedimentary cryptotephra records. Here we present and evaluate two methods for the quantification of cryptotephra, shown on lake sediments from a site with distant Laacher See tephra fallout. Our methods initiate with delineating the extent and distribution of the cryptotephra layer within the sediments, accomplished through the integration of X-ray fluorescence (XRF) and computed tomography (medical- and μ-CT). The first quantification method involves the well-established process of shard extraction through stepwise density separation, followed by improved and statistically evaluated quantification introducing a new standardized marker. While the method itself is used widely for many years among cryptotephra researchers, we demonstrate how the new marker improves its precision for cryptotephra quantification, providing a robust, straightforward laboratory-based technique. Additionally, we introduce an innovative, software-based method that combines an SEM-based automated mineralogy analysis on thin sections with customized image analysis, which allows to study the area fraction of the glass phase, its depth-dependent variation, particle concentration with a focus on clustering behavior, depth-dependent particle count, total particle count, and particle size distribution within the glass phase. The significance of both methods lies in the efficiency and precision of cryptotephra quantification, enabling a deeper understanding of shard concentration and distribution. This study emphasizes the methodological innovations, offering improved tools for cryptotephra quantification, without focusing on detailed application-based analyses.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"88 ","pages":"Article 101670"},"PeriodicalIF":1.7,"publicationDate":"2025-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868298","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":"Dating earthworks with luminescence: Insights from the medieval ringfort of Den Burg, Texel (the Netherlands)","authors":"Roy van Beek ,&nbsp;Elizabeth L. Chamberlain ,&nbsp;Kirsten de Nooijer ,&nbsp;Sander Gerritsen ,&nbsp;Michiel Bartels ,&nbsp;Jakob Wallinga","doi":"10.1016/j.quageo.2025.101669","DOIUrl":"10.1016/j.quageo.2025.101669","url":null,"abstract":"<div><div>Ancient human-made earthworks such as mounds, middens, levees, raised or terraced fields, enclosures and forts are omnipresent in many areas across the globe. They may offer rich and important information on past societies. However, harvesting such data is significantly hampered by the general lack of robust earthwork chronologies. Dating earthworks is notoriously difficult due to a variety of factors, including a scarcity of closely datable archaeological finds, the frequent absence of suitable and relevant material for radiocarbon dating, and lacking or ambiguous historical sources. Luminescence dating may provide a solution for these problems because it enables direct dating of sediment, a ubiquitous and relevant material in earthwork construction. In this paper we focus on ringforts: circular or semi-circular defensive structures surrounded by earthen banks and ditches, which originated in the first millennium CE and appear to reflect major transformations in early historical societies. We present the results of a detailed luminescence study of a ringfort underlying the modern town centre of Den Burg, on the Wadden Isle of Texel in the Netherlands. We dated samples from different sedimentary contexts (bank and ditch infills) using both quartz optically stimulated luminescence (OSL) and feldspar single-grain post-infrared infrared stimulated luminescence (pIRIR). We analyze the results in the context of age interpretations based on other proxy data (radiocarbon dates, archaeological finds, historical evidence). This yields a new, robust dating chronology that changes the biography of the ringfort. The initial construction dates between 730 and 840 CE, making Den Burg the oldest known ringfort in the Low Countries. We reflect on the best practices for luminescence dating of earthworks and on archaeological implications for other ringforts in the Netherlands and beyond.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"88 ","pages":"Article 101669"},"PeriodicalIF":1.7,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143842661","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":"High-precision radiocarbon dating and carbon reservoir effect of a maar lake in South China","authors":"Yao Gu ,&nbsp;Huayu Lu ,&nbsp;Hongyan Zhang ,&nbsp;Pengyu Lin ,&nbsp;Xiaoyi Dong ,&nbsp;Yao Wang ,&nbsp;Shuangwen Yi ,&nbsp;Fuzhi Lu ,&nbsp;Fan Yang","doi":"10.1016/j.quageo.2025.101668","DOIUrl":"10.1016/j.quageo.2025.101668","url":null,"abstract":"<div><div>High-resolution maar lake records with robust age control provide an ideal foundation for investigating paleoclimate change. However, in tropical-subtropical South China, the carbon reservoir effect of lake sediments is poorly understood, resulting in a lack of high precision records, hindering the comprehensive understanding of regional climate change and its forcing mechanism. In this study, based on a newly drilled core from the Tianyang (TY) maar lake located in South China, we conducted detailed radiocarbon dating of various materials to assess the reservoir effect and establish a reliable high-resolution chronology of the maar lake. Comparing radiocarbon ages of different grainsize and different fractions, the ages of bulk samples were closest to those of plant remains or charcoals which we consider as the reliable dating materials. Pairs of bulk samples and plant remain or charcoal ages indicate a limited but variable reservoir effect in TY maar lake. The reservoir effect is negligible from the surface to 623 cm (0–30.95 ka) and then gradually increased from negligible to approximately 700 years between the depth of 623–747 cm (30.95–37.15 ka). We hypothesize that the reservoir effect in the deeper part of the lake results from a combination of longer mean residence time due to lower sedimentation rates and increased groundwater level, which is linked to higher sea levels during the marine isotope stage 3 (MIS3). After reservoir correction, Bayesian age-depth modelling was performed based on 53 reliable radiocarbon ages, achieving a high-resolution chronology of TY maar lake covering the past ∼37 ka period with a mean age model uncertainty of 357 years, providing a reliable dating framework for paleoclimate reconstruction.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"88 ","pages":"Article 101668"},"PeriodicalIF":1.7,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769296","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":"Developing a new approach to the luminescence dating of sediments from glacial contexts","authors":"M.D. Bateman ,&nbsp;E. Davies ,&nbsp;D.J.A. Evans ,&nbsp;D.H. Roberts ,&nbsp;E.R. Connell ,&nbsp;E.J. Rhodes","doi":"10.1016/j.quageo.2025.101659","DOIUrl":"10.1016/j.quageo.2025.101659","url":null,"abstract":"<div><div>Whether glacial sediments were exposed to light (bleached) prior to burial is uncertain but critical for luminescence dating. In such contexts, quartz can have unstable and weak signals, feldspar have less bleachable and fading signals and both require statistical modelling to extract the true burial age data. This paper presents a new approach using feldspars measured at multiple elevated temperatures (MET) and screened to select grains with plateau equivalent dose values which should be the well-bleached and unfaded grains upon which to base a true burial age. The MET plateau approach was tested on an aeolian site in Canada and two former UK glacial sites. When applied to the Canadian aeolian samples, it showed that the method successfully accepted mostly well-bleached grains whilst excluding grains with fading or that had poor luminescence characteristics. When applied to a well dated glacial sequence it yielded ages in good agreement with existing independent chronologies. A previously undated glacial site yielded stratigraphically consistent ages but these are thought likely to be slight age over-estimates due to extremely limited bleaching at deposition. In summary, the MET plateau approach improved avoidance of partially bleached grains, avoided corrections for residuals and/or fading and reduced the need for statistical models to interpret equivalent dose distributions. However, some glacial sediments may have had so limited bleaching that these may still not be easy to luminescence date. The MET plateau approach if adopted could allow re-evaluation of existing glacial chronologies and extend luminescence dating to more glacial sediments.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"87 ","pages":"Article 101659"},"PeriodicalIF":1.7,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143684273","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":"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":"First investigation of the luminescence dating of loess in the eastern Tibetan Plateau using K-feldspar MAR MET-pIRIR protocol","authors":"Li Liu,&nbsp;Shengli Yang,&nbsp;Pushuang Li,&nbsp;Jingzhao Zhang,&nbsp;Rui Li,&nbsp;Dongxue Li,&nbsp;Xuechao Xu,&nbsp;Yuanlong Luo,&nbsp;Xiuyun Yang","doi":"10.1016/j.quageo.2024.101648","DOIUrl":"10.1016/j.quageo.2024.101648","url":null,"abstract":"<div><div>The multi-aliquot regenerative dose (MAR) multi-elevated-temperature post-infrared infrared stimulated luminescence (MET-pIRIR) dating protocol exhibits great potential for extending the luminescence dating limit. However, further investigations are needed. Loess deposits on the Tibetan Plateau (TP) significantly differ from those on the Chinese Loess Plateau in terms of both formation age and dust source, making them ideal for studying the past climatic and environmental changes on the TP. However, detailed chronological studies are lacking. This study investigates the applicability of the MAR MET-pIRIR protocol to the Danba (DB) loess-paleosol sequence in the eastern TP, aiming to establish a chronological framework for this typical loess sequence. For TP loess samples with equivalent doses (D_e) below ∼950 Gy, multi-aliquot MET-pIRIR₂₅₀ and single-aliquot pIR₂₀₀IR₂₉₀ dating methods yield consistent results. However, for samples with D_e exceeding ∼950 Gy, the SAR-pIR₂₀₀IR₂₉₀ method underestimates ages, while the MAR MET-pIRIR₂₅₀ procedure remains reliable up to ∼1100 Gy. Using MAR MET-pIRIR protocol with the global standard growth curve method, we have established a new absolute chronological framework for the DB loess-paleosol sequence, indicating that loess deposition in the TP began at least ∼230 ka ago. The magnetic susceptibility records of this loess sequence reveal a pattern of alternating moist interglacial and dry glacial periods. During the last interglacial period, precipitation levels were significantly elevated and exhibited considerable variation in the eastern TP.</div></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"86 ","pages":"Article 101648"},"PeriodicalIF":1.7,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143167932","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 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":"Introduction to special issue LED 2023","authors":"Naomi Porat (Managing Guest Editor),&nbsp;Frank Preusser (Chief Editor)","doi":"10.1016/j.quageo.2024.101639","DOIUrl":"10.1016/j.quageo.2024.101639","url":null,"abstract":"","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"85 ","pages":"Article 101639"},"PeriodicalIF":1.7,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143160658","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":"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}