Quaternary Geochronology最新文献

{"title":"Multiple age control of young nebkhas in the Mu Us dune field, north-central China","authors":"Ying Wang,&nbsp;Shihan Li,&nbsp;Shuangwen Yi,&nbsp;Zhiwei Xu","doi":"10.1016/j.quageo.2024.101531","DOIUrl":"10.1016/j.quageo.2024.101531","url":null,"abstract":"<div><p>Nebkhas, a unique type of biogeomorphological aeolian landforms formed by sand accumulation around plants, are widely distributed in arid and semi-arid regions globally. Previous studies have highlighted the potential of nebkha sediments as valuable archives for understanding past climate and environmental changes. However, establishing a reliable chronological framework for nebkha sediments has posed challenges due to the lack of suitable dating methods. In this study, we applied both the quartz OSL and K-feldspar pIRIR₁₅₀ protocols to date nebkha sediments from three different sites within the Mu Us dune field in north-central China. Internal checks indicate that the quartz OSL protocol is suitable for equivalent dose measurements, though age determinations for some quartz samples with weak luminescence signals may be subject to uncertainties. K-feldspar exhibits brighter signal intensity and a higher signal-to-noise ratio, making K-feldspar pIRIR₁₅₀ ages reliable, particularly when residual doses are low, luminescence signals are stable, and dose recovery ratios are satisfactory. The results indicate that the luminescence ages derived from both the quartz OSL and K-feldspar pIRIR₁₅₀ protocols are comparable, and these ages align with stratigraphic sequences and independent ¹³⁷Cs dating results. Based on the established chronologies, our findings suggest that some large nebkhas in the southwestern Mu Us dune field likely originated 100–200 years ago, possibly in response to either climate-driven or human-induced aridification in this region.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"82 ","pages":"Article 101531"},"PeriodicalIF":2.7,"publicationDate":"2024-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140771311","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":"The De underestimation caused by the unstable medium component in the initial OSL signal from lava-baked quartz and correction strategies","authors":"Chun-Xin Wang ,&nbsp;Chang Huang ,&nbsp;Anchuan Fan ,&nbsp;Sheng-Hua Li","doi":"10.1016/j.quageo.2024.101532","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101532","url":null,"abstract":"<div><p>Accurately dating of eruptive events is crucial for understanding the eruptive history of a volcano. The optically stimulated luminescence (OSL) dating technique has been widely used in the geochronological studies of volcanic eruption events. However, its application is challenging due to the complex components of OSL signals in which the unstable medium component often results in age underestimation for quartz related to volcanic activity. In this study, we investigated the quartz OSL properties from a lava-baked sediment layer from the Tengchong volcanic field, southwest China. The results indicated that the initial OSL signal of the lava-baked quartz was primarily dominated by the medium component, which exhibited small Fast Ratio values (&lt;10). The equivalent dose (D_e) values showed a negative correlation with recuperation, and the D_e-t plot concurrently showed a decreasing trend. Pulse-annealing tests confirmed the medium component in the initial OSL signal to be thermally unstable, hence resulting in age underestimation. Consequently, the early background subtraction method and another two correction strategies were employed to derive D_e values from the more stable fast component: Ⅰ) fitting the D_e-t plot, and Ⅱ) fitting the D_e-recuperation plot. The study found that D_e values could only be partially corrected using the early background subtraction method. In contrast, the latter two methods allowed for successful correction. The corrected quartz OSL ages agree well with independent MET-pIRIR ages of potassium feldspar and ¹⁴C ages. The reliable chronological results suggest that the Dayingshan volcano erupted approximately 41–45 thousand years ago.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"82 ","pages":"Article 101532"},"PeriodicalIF":2.7,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140647297","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 statistical method for treating the “negative-age” and “negative-atom-number” conundrums in radioisotope dating","authors":"W.-K. Hu ,&nbsp;W. Jiang ,&nbsp;Z.-T. Lu","doi":"10.1016/j.quageo.2024.101521","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101521","url":null,"abstract":"<div><p>In radioisotope dating, statistical fluctuations of atom counts or decay counts can sometimes lead to unphysical results, such as negative counts after subtracting the background or negative apparent ages near the boundaries of the dating range. How to treat these boundary cases with a unified approach and give proper estimates on age limits and confidence intervals is an important issue in radioisotope dating. In this work, we combine the Feldman-Cousins likelihood-ratio ordering method for interval estimation, a Frequentist approach to make consistent transitions from the choice of one-sided limits to two-sided confidence intervals, and a Bayesian method to treat the background uncertainties. This data treatment method naturally eliminates the unphysical results. We use ⁸¹Kr dating and Atom Trap Trace Analysis as an example to illustrate the advantages. This method can be generalized to other radioisotopes and ultra-sensitive analysis techniques.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101521"},"PeriodicalIF":2.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140344436","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":"Episodic sediment accumulation linked to global change in the endorheic Qaidam Basin of the Tibetan Plateau revealed by feldspar luminescence dating","authors":"Zhaojing Ding ,&nbsp;Songlin Gong ,&nbsp;Guoqiao Xiao ,&nbsp;Yixuan Wang ,&nbsp;Weitao Yuan ,&nbsp;Jianwei Zhang ,&nbsp;Jiang Wang ,&nbsp;Zhongping Lai","doi":"10.1016/j.quageo.2024.101522","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101522","url":null,"abstract":"<div><p>Given its high accumulation rate in sediments, the endorheic basin in arid regions plays a crucial role in reconstructing paleo-environment. However, it would not provide high-resolution climatic records if significant wind-eroded depositional hiatuses were inevitable within a severe wind environment. Unconformable contacts have been found during field survey in the top part of the stratigraphy in the Qaidam Basin, a prototypical endorheic basin in central Asia. To elucidate whether the sediment is continuous, we employed luminescence dating methods of feldspar pIR₂₀₀IR₂₅₀ and quartz OSL to date sediments, including lacustrine sediments and salt crusts, from the Qarhan Playa that is the Quaternary depositional center of the Qaidam Basin. Various experiment tests, including preheat plateau, dose recovery, and residual dose, were conducted. The dating results show that the feldspar pIR₂₀₀IR₂₅₀ can provide dependable ages with negligible residual doses. The pIR₂₀₀IR₂₅₀ dating ages within the last glacial cycle reveal several environmental shifts. A Qarhan paleolake in Marine Isotope Stage (MIS) 5 was demonstrated by the cluster ages of ∼140–80 ka of lacustrine sediments. The salt crust ages of 136 ± 10 ka and 97 ± 6 ka indicate that, before completely disappeared, the paleolake with shallow dish-shape depression had been dried up more than once, illustrating “shallow——dry——shallow” cycles. The playa in the eastern Qaidam Basin evolved mainly in warm periods, such as MIS 5 and MIS 1, supported by the salt crust ages of MIS 5 (136 ± 10 ka and 97 ± 6 ka) and MIS 1 (10 ± 1 ka and 0.6 ± 0.1 ka). Depositional hiatus in the last glacial cycle were identified by unconformable contacts in three sections between the lacustrine strata and their overlying playa strata, with corresponding age gaps of 158 ± 20–97 ± 6 ka, 131 ± 10–10 ± 1 ka, and 84 ± 7–0.6 ± 0.1 ka, respectively. In all the three sections the sediments for the whole of the last glacial period is missing, eroded by wind. This process should have occurred periodically during the glacial-interglacial cycles of the orbital global climatic changes. The results also show that hiatuses are common for endorheic basins on the Earth with age gaps of up to ∼100 ka, suggesting that robust chronology should be established before any climatic correlation due to severe wind erosion leading to episodic sediment accumulation.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101522"},"PeriodicalIF":2.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140339554","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":"New volcanological, 40Ar/39Ar dating and paleomagnetic record from Trindade Island and stratigraphic implications","authors":"N.G. Pasqualon ,&nbsp;J.F. Savian ,&nbsp;E.F. Lima ,&nbsp;W.P. de Oliveira ,&nbsp;G.A. Hartmann ,&nbsp;C.M.S. Scherer ,&nbsp;L.M.M. Rossetti ,&nbsp;F.R. da Luz ,&nbsp;R.I.F. Trindade ,&nbsp;E.B. Cahoon ,&nbsp;D.P. Miggins ,&nbsp;A. Koppers ,&nbsp;A. Di Chiara","doi":"10.1016/j.quageo.2024.101518","DOIUrl":"10.1016/j.quageo.2024.101518","url":null,"abstract":"<div><p>Unrevealing the stratigraphy of volcanic systems is fundamental to understanding their eruptive history and requires a multiproxy approach for the accurate correlation and interpretation of deposits. We present new volcanological, ⁴⁰Ar/³⁹Ar ages and paleomagnetic data from the volcanic rocks of Trindade Island, located at ∼1.260 km from the Brazilian coast in the South Atlantic Ocean. The reconstruction of the volcanic history of Trindade Island is important because it is the youngest volcanic terrain in Brazil and part of a submarine chain that represents the most recent plume-induced alkaline manifestation beneath the South American plate. Our results suggest Trindade Island underwent two main phases of volcanism. The first phase (3.9–1.5 Ma) formed the Trindade Complex and Desejado Formation, with eruptive styles ranging from phreatomagmatic/Surtseyan to Vulcanian and of dominant phonolitic composition. The second phase (1.0–0.06 Ma) formed the nephelinitic monogenetic centers Morro Vermelho, Valado and Paredão Volcano Formations through dominant Hawaiian and Strombolian styles. The new ages imply a revised stratigraphy for the youngest units of Trindade Island, with partial overlap between them. The revised chronology integrated to the paleomagnetic directional data evidence that Trindade Complex formed during Gauss normal chron (D = 355.4°; I = −49.6°), Valado and Paredão Volcano during Brunhes normal chron (D = 14°; I = −42.3° and D = 9.2°; I = −35.2°, respectively), while Morro Vermelho records the late Matuyama-early Brunhes chron (D = 36.5°; I = −19.8°), with site-level mean paleodirections of normal and transitional polarity within the reverse Matuyama interval.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101518"},"PeriodicalIF":2.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140272725","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":"Re-examining the earliest evidence of human presence in western Europe: New dating results from Pirro Nord (Italy)","authors":"Mathieu Duval ,&nbsp;Lee J. Arnold ,&nbsp;Jean-Jacques Bahain ,&nbsp;Josep M. Parés ,&nbsp;Martina Demuro ,&nbsp;Christophe Falguères ,&nbsp;Qingfeng Shao ,&nbsp;Pierre Voinchet ,&nbsp;Julie Arnaud ,&nbsp;Claudio Berto ,&nbsp;Gabriele Luigi Francesco Berruti ,&nbsp;Sara Daffara ,&nbsp;Benedetto Sala ,&nbsp;Marta Arzarello","doi":"10.1016/j.quageo.2024.101519","DOIUrl":"10.1016/j.quageo.2024.101519","url":null,"abstract":"<div><p>We present the results of the first dating study of site P13 at Pirro Nord, Italy, which documents some of the earliest evidence for hominin presence in western Europe. Our multi-technique dating approach is based on a combination of palaeomagnetism, electron spin resonance (ESR), thermally-transferred optically stimulated luminescence (TT-OSL) and combined U-series/ESR applied to both fossil material and host sediment. It provides ages ranging from 627 ± 59 to 1006 ± 126 ka and clustering around 0.8 Ma. One additional fossil tooth collected from the nearby P10 site also returns an age within this range. Ordinarily, this outcome would naturally lend itself to the straightforward conclusion that Pirro Nord has a late Early Pleistocene age of ∼0.8 Ma. However, this interpretation is complicated by the fact that these numerical dating results are in contradiction with the biochronological evidence, which suggests a much older age on the order of 1.3–1.7 Ma. Consequently, we explore the various potential sources of bias that could have influenced the numerical dating methods and the biochronological inferences. In particular, the critical evaluation of the palaeomagnetic data available for various sites belonging to the younger Colle Curti Faunal Unit (FU) indicates that there is non-negligible age uncertainty on the allegedly minimum age of ∼1.1 Ma traditionally assigned to the Pirro FU. Moreover, while the combined U-series/ESR dataset could accommodate an older age for the fossil remains if uranium uptake in the dental tissues occurred relatively rapidly before the closure of the system (CSUS model), the ages obtained from the two semi-independent quartz dating methods (ESR and TT-OSL) both appear to indicate that the sediment was last exposed to sunlight about 0.8 Ma. This disparity opens up the possibility that the sediment and fossil assemblage may not be coeval. In other words, it is possible that the fossil remains may have been reworked into younger deposits that entered the karst about 0.8 Ma. Though feasible from a karst sedimentary dynamics perspective, this hypothesis is not consistent with previous taphonomic studies that indicate an absence of evidence for fossil reworking after entering the karst. At the very least, our dating results indicate that site formation processes at Pirro Nord site P13 are more complex than previously considered.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"82 ","pages":"Article 101519"},"PeriodicalIF":2.7,"publicationDate":"2024-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140399099","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":"Revisiting a proof of concept in quartz-OSL bleaching processes using sands from a modern-day river (the Séveraisse, French Alps)","authors":"Magali Rizza ,&nbsp;Gilles Rixhon ,&nbsp;Pierre G. Valla ,&nbsp;Stéphanie Gairoard ,&nbsp;Doriane Delanghe ,&nbsp;Jules Fleury ,&nbsp;Michal Tal ,&nbsp;Solveig Groleau","doi":"10.1016/j.quageo.2024.101520","DOIUrl":"10.1016/j.quageo.2024.101520","url":null,"abstract":"<div><p>Conditions of sediment transport and deposition in highly dynamic fluvio-glacial environments enhance incomplete bleaching of luminescence signals during sunlight exposure. Whatever the geomorphic context or application, partial bleaching has been widely reported and remains a methodological limitation for application of Optically Stimulated Luminescence (OSL) dating methods, potentially resulting in sediment-burial age overestimation. This study focuses on the highly dynamic Séveraisse River (SW French Alps) where modern-day alluvial sands of a braided reach were sampled to assess the degree of quartz-OSL partial bleaching associated with superficial pre- and post-deposition geomorphic processes. Our original approach combines (i) a photogrammetry-based survey, (ii) sediment grain-size analysis, and (iii) measurements of both portable OSL luminescence signals and conventional quartz OSL equivalent doses in modern superficial (from 0.1 to 1 cm) and sub-surface (up to 30 cm) alluvial sands exposed to sunlight for at least 19 days. Our results show high but spatially variable residual luminescence signals at the surface, measured in all grain-size fractions with both the portable luminescence reader (≥5 x10⁶ cts/g) and conventional quartz-OSL doses (≥80 Gy), even within the uppermost millimetres of the exposed alluvial surface. Our data thus highlight poor luminescence bleaching in the Séveraisse's modern sands, during both pre-depositional transport and post-depositional exposure. In addition, our study reveals, for the first time, the significant sunlight attenuation over a few millimetres within modern alluvial sediments, perhaps conditioned by dark sand grains, and/or by superficial blanketing by silts (i.e. waning flow stage) that leads to a porosity decrease and very low sunlight penetration. We suggest the occurrence of a critical sediment layer (i.e. only a few mm thick) that could play a key role in bleaching processes for alluvial surfaces, with strong implications for our understanding of residual doses in braided systems' sandy deposits and the dynamics of such alluvial surfaces.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"82 ","pages":"Article 101520"},"PeriodicalIF":2.7,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140281190","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":"ESR/U-series and pIR-IR290 dating of the Middle Pleistocene site of Lunel-Viel (LV I), Hérault, Southern France","authors":"Christophe Falguères ,&nbsp;Christelle Lahaye ,&nbsp;Olivier Tombret ,&nbsp;Lisa Garbé ,&nbsp;Brice Lebrun ,&nbsp;Jean-Jacques Bahain ,&nbsp;Nicolas Frerebeau ,&nbsp;Carla Giuliani ,&nbsp;Jean-Philip Brugal","doi":"10.1016/j.quageo.2024.101516","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101516","url":null,"abstract":"<div><p>The Mas des Caves site at Lunel-Viel, Southern France, is a complex of several caves, <em>developed</em> in Miocene limestone, that have yielded a rich archaeo-palaeontological sequence attributed to the Middle Pleistocene with abundant vertebrates and lithic artefacts. The first caves (LVI, II and III), discovered in 1800, were excavated at the beginning of the 19th century (Serres et al., 1828) before falling into oblivion for over a century. The main cavity is <em>LVI</em>, when <em>LVII</em> and III are smaller subparallel galleries not connected to LVI. In the early 1970s, research was conducted in the main gallery by E. Bonifay who discovered an extension named <em>LVIV</em> and the natural entrance (sinkhole, doline) both completely closed now.</p><p>Recently, a multidisciplinary approach has been set up (DRAC-SRA Occitanie) to contextualize the ancient collections with the recent ones and to allow a better understanding of the site formation, palaeoenvironmental and behavioral history of the animals and humans who lived there (Brugal et al., 2021). The previous chronology based on faunal evidence yields important biomarkers (including new genus and species/subspecies) making Lunel-Viel a major Middle Pleistocene site in the European record. Among various dating techniques used in this study, trapped-charged methods such as combined ESR/U-series and <em>pIR-IR</em>_<em>290</em> were applied on fossil tooth enamel and on K-feldspars, respectively. The results obtained by both methods are in agreement and suggest a period of human occupation between 300 and 200 ka. This age range matches well with the composition of the faunal assemblage attributed to the second part of the Middle Pleistocene (biochronology) and which <em>constrains</em> the occupation to a cool/temperate and humid period which could be contemporaneous with the MIS7 (Lisiecki and Raymo, 2005) cited in figure 5 legend.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101516"},"PeriodicalIF":2.7,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140209507","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":"On the early postclassic collapse of Plazuelas (Northern Border of Mesoamerica): Archaeomagnetic evidence based on full geomagnetic vectors","authors":"Alejandra García-Pimentel ,&nbsp;Avto Goguitchaichvili ,&nbsp;Ma Ruth Ortega Rivera ,&nbsp;Rafael García-Ruiz ,&nbsp;Rubén Cejudo ,&nbsp;Vadim Kravchinsky ,&nbsp;Miguel Cervantes ,&nbsp;Juan Morales","doi":"10.1016/j.quageo.2024.101514","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101514","url":null,"abstract":"<div><p>We report a detailed rock-magnetic, archaeomagnetic and absolute intensity investigation on burned <em>in situ</em> remains of the Plazuelas archaeological site (Northern Border of Mesoamerica). Fifty-six specimens were subjected to step-wise alternating field demagnetizations to retrieve characteristic remanence directions. All samples yielded evidence of stable, single-component magnetization carried by magnetite or Ti-poor titanomagnetite. Sixty-four specimens were selected for paleointensity experiments following the Thellier double heating technique, including remanence anisotropy correction. The archaeomagnetic dating, based on full geomagnetic vectors, was performed using the global geomagnetic models and the regional Paleosecular Variation Curves available for Mesoamerica. The most probable age intervals obtained for the burned floor of Site 1 (<em>Casas Tapadas North</em>) are within the interval 972AD – 744 AD. In the case of the burned floor of Site 2 (<em>Casas Tapadas West</em>), the ages obtained fall within 971 AD - 752 AD. In the case of the burned floor of Site 3 (<em>South Sector</em>), the ages obtained fall within the interval 752 AD – 969 AD. The calculation of the most probable age intervals, carried out using the Bootstrap resampling method, provided the dates of 940 ± 6 AD, 896 ± 14 AD and 883 ± 14 AD, respectively. These ages agree well with various archaeological hypotheses on the sudden collapse of Plazuelas as a result of intentional destruction, mutilation and generalized firing due to the local war and/or social unrest.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101514"},"PeriodicalIF":2.7,"publicationDate":"2024-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140137914","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":"ESR/U-series dating of palaeontological remains from the Neanderthal site of Mutzig-Rain (Alsace, France)","authors":"Jean-Jacques Bahain ,&nbsp;Olivier Tombret ,&nbsp;Lisa Garbé ,&nbsp;Christophe Falguères ,&nbsp;Héloïse Koehler ,&nbsp;Fabio Wegmüller","doi":"10.1016/j.quageo.2024.101517","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101517","url":null,"abstract":"<div><p>The Middle Paleolithic site of Mutzig-Rain, discovered in 1992, has been studied through several pits (called M1 to M15) and excavation area since 2009, evidencing several localities and delivering more than 5000 lithic artifacts and 12,000 well preserved paleontological remains. The main excavation M2 sequence corresponds to a collapsed rock shelter, containing several levels of Middle Paleolithic occupation. The faunal assemblage of the main archaeological levels (l.7a to 7c) from this sequence includes woolly mammoth, reindeer, horse, bison and woolly rhinoceros, reflecting both cold climate and a steppe context for the whole sequence, while microfauna from the lower levels (l.7d and l.10) indicate the occasional presence of forests that could correspond to a cooler climate. In 1995, U-series analyses on bones from M8 were attempted but the obtained results did not follow the sample stratigraphic order. Later, an OSL dating study has placed the M2 archaeological sequence as coeval to the onset of the Weichselian glacial stage (MIS5d-5a), between 100 and 80 ka.</p><p>The good preservation of the abundant faunal remains at Mutzig-Rain has allowed their use for ESR/U-series dating studies and the results obtained on Mutzig horse teeth are given in the present paper. A first set of analyses of teeth carried out from the M2 excavation provided ages around 106-96 ka for levels M2 l.7, in agreement with the OSL data, despite quite systematic evidence of U-leaching from the dental tissues and the consequent use of the Accelerating Uptake (AU) model for the age calculation. A second set of analyses on teeth from the M2 and M8 localities confirms this uranium leaching trend, placing the deposition of these levels ca 133 -122 ka.</p><p>Taking the whole set of ESR/U-series ages, which are slightly older than the OSL dates, would suggest that the stratigraphic sequence was deposited between ca 130 ka (M8 l. 6 and M2 l.10) and ca 100 ka (M2 l.7), i.e. on a time range covering the Eemian Interglacial (MIS5e) and the subsequent Early Weichselian Glacial stage (MIS5d-5a). However, as the faunal record indicates a cool climate and an open steppe-like environment for the whole archaeological sequence, the ESR/U-series dating to the Eemian Interglacial in the Mutzig-Rain sequence seems unlikely. In order to check the quality of the paleodosimetric reconstruction of the ESR/U-series analyses, an additional isochron study was performed for the two levels for which several teeth were analyzed: M2 l.7 (n = 4) and M8 l.6 (n = 3). This isochron study validates the proposed reconstruction and confirms the Early Weichselian age of these two levels. These results confirm the chronology established previously with OSL and places Mutzig-Rain as a reference site for the understanding of the Neanderthal Middle Palaeolithic occupation in Eastern France.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"81 ","pages":"Article 101517"},"PeriodicalIF":2.7,"publicationDate":"2024-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140191733","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}