Quaternary Geochronology最新文献

{"title":"Dating post-LGM aeolian sedimentation and the Late Palaeolithic in Central Yakutia (northeastern Siberia)","authors":"Mariya S. Lukyanycheva ,&nbsp;Redzhep N. Kurbanov ,&nbsp;Natalia A. Taratunina ,&nbsp;Anzhela N. Vasilieva ,&nbsp;Vasiliy M. Lytkin ,&nbsp;Andrei V. Panin ,&nbsp;Anton A. Anoikin ,&nbsp;Thomas Stevens ,&nbsp;Andrew S. Murray ,&nbsp;Jan-Pieter Buylaert ,&nbsp;Mads F. Knudsen","doi":"10.1016/j.quageo.2024.101563","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101563","url":null,"abstract":"<div><p>Central Yakutia is a large region in northeastern Siberia characterized by extensive permafrost, large river valleys, mountain glaciers, and large massifs of aeolian sands; the geological history of the region is complex and, at present, poorly constrained. In recent years, it has been shown that aeolian sands cover up to 60% of large parts of Central Yakutia. This paper presents the results of luminescence dating of aeolian sedimentation at the Diring Yuriakh Palaeolithic site located in the middle reaches of the Lena River. Field studies identified several thick units of aeolian sand, which cover an old deflation surface with Late (Duktai culture) and Early Palaeolithic (Diring culture) artefacts. The reliability of the OSL chronology was assessed by comparison of ages based on the optically stimulated luminescence from quartz and the infra-red stimulated luminescence from potassium-rich feldspars; these age pairs are in good agreement, implying that at least the quartz grains were sufficiently bleached before sedimentation. We obtained OSL ages that reflect three periods of accumulation between the LGM and the Holocene: ∼21 ka, 15-14 ka, and 12.5–10 ka. These periods of accumulation broadly coincide with global cooling episodes during the Last Glacial Maximum, the Older Dryas, and the Younger Dryas, with some extension into subsequent warmer intervals, whereas the intervening intervals without preserved sediments are taken to reflect dune stability during warmer periods. The sand on the terraces, sourced from alluvial bars in the river channel, was blown up the valley slope during cold and dry periods when the vegetation cover was sparse. When the climate warmed, the vegetation took some time to spread, and so the accumulation of aeolian sand on the high terraces continued into the warm periods. We also infer periods of deflation (wind erosion) that occurred before 21 ka and between 20 and 15 ka, presumably due to increased aeolian activity and localized remobilization of sediment. The new OSL chronology shows that the younger artefacts located at the cape of Diring Yuriakh, belonging to the Late Palaeolithic Duktai culture, are older than 15 ka. The new ages also show that the post-LGM aeolian sand sequences at Diring Yuriakh are correlated with the regionally developed subaerial Dolkuma Formation.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101563"},"PeriodicalIF":1.7,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141541633","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":"First luminescence dating of exhumed fault-zone rocks of the North Tehran Fault, Iran","authors":"Maryam Heydari ,&nbsp;Mohammad R. Ghassemi ,&nbsp;Christoph Grützner ,&nbsp;Sumiko Tsukamoto ,&nbsp;Alicja Chruścińska ,&nbsp;Frank Preusser","doi":"10.1016/j.quageo.2024.101562","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101562","url":null,"abstract":"<div><p>Here we report luminescence dating results on exhumed fault rocks from the North Tehran Fault (NTF, Iran), including the fault gouges. The NTF is an oblique-dip thrust fault expanding from west to east at the northern fringe of the megacity of Tehran. Although the fault is known to be active and a major threat to the city, only little is known about its earthquake history. We present first data on the timing of past fault motion using dating of fault rocks. Three sites have been selected for this study in which the fault damage zone is associated with Eocene volcaniclastic rocks (Karaj Formation). The fault gouge, transitional and damage zone were sampled for which we observed slip planes in the field. The fault rocks are composed of quartz and alkali feldspar favourable for luminescence dating. However, our study reveals that the quartz optically stimulated luminescence (OSL) signal of the Karaj Formation does not seem to have a measurable fast decaying signal component. Instead, the post-infrared stimulated luminescence at 225 °C (pIRIRSL₂₂₅) of polymineral fine-grain fraction appears to be the most feasible signal for these samples. The first luminescence-based results presented here comprise an age range from 45 ± 5 ka to 72 ± 13 ka for fault gouges and transitional zone. Since dating the transitional zone close to the fault gouge led to a younger age than the fault gouge at one site, we conclude that the sampling location plays a crucial role in dating exhumed fault rock using luminescence dating. The obtained ages are far older than those of the previous palaeoseismological studies that dated earthquake-related sedimentary features in the region. Therefore, more research is required to shed light on the resetting mechanism and condition of these fault rocks due to the recent activity of the NTF.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101562"},"PeriodicalIF":1.7,"publicationDate":"2024-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000669/pdfft?md5=3d1f714895c6a2d4c253686547c2b430&pid=1-s2.0-S1871101424000669-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141541634","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":"Using quartz OSL signals from SAR cycles for sediment provenance studies","authors":"Souza P.E. ,&nbsp;Porat N. ,&nbsp;Sawakuchi A.O. ,&nbsp;Cruz C.B.L. ,&nbsp;Breda C. ,&nbsp;Rodrigues F.C.G. ,&nbsp;Oliveira S.C. ,&nbsp;Pupim F.N.","doi":"10.1016/j.quageo.2024.101574","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101574","url":null,"abstract":"<div><p>Quartz optically stimulated luminescence (OSL) sensitivity is varied and related to Earth surface processes and, thus, it has been shown to be a useful tool for appraising sediment recycling and provenance investigations. These investigations are mainly based on OSL data purposely measured for sensitivity calculations. However, it has been recently shown that the relative sensitivity of the quartz OSL fast component (%BOSL_F) from the first test dose (T_n) signal from an OSL dating measurement using the Single Aliquot Regenerative-dose (SAR) protocol can be used to discriminate sediment sources. Here, we investigate the possibility of characterizing %BOSL_F for provenance purposes using not only T_n signals but all other OSL signals obtained over SAR protocol cycles from OSL dating measurements. We address the %BOSL_F behaviour over SAR cycles (if conservative or not), the %BOSL_F dependency on dose-size, differences between %BOSL_F values given by natural/regenerative and test dose signals, and %BOSL_F application for provenance studies. Quartz sand grains data from twenty Late Quaternary sediment samples, representing orogenic and cratonic sources and diverse depositional contexts from South America, Africa, and Asia, are included in the analysis. All calculations were performed using data that have been previously obtained for equivalent dose estimation. The key finding is that the averaged %BOSL_F of all SAR signals was representative of the samples' characteristic sensitivity and could satisfactorily discriminate samples from known sources, mainly in the case of high-sensitivity samples. We could distinguish sediment source areas by averaging the %BOSL_F of OSL signals from SAR natural/regenerative and test doses together. Likewise, laboratories worldwide could produce regional/global sediment provenance fingerprinting reference data using their dating measurements accumulated throughout the last decade.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101574"},"PeriodicalIF":1.7,"publicationDate":"2024-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483731","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":"Single-grain luminescence and combined U-series/ESR dating of the early Upper Palaeolithic Lagar Velho Rock Shelter, Leiria, Portugal","authors":"L.J. Arnold ,&nbsp;M. Demuro ,&nbsp;M. Duval ,&nbsp;R. Grün ,&nbsp;M. Sanz ,&nbsp;A.M. Costa ,&nbsp;A.C. Araújo ,&nbsp;J. Daura","doi":"10.1016/j.quageo.2024.101572","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101572","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The existing radiocarbon (&lt;sup&gt;14&lt;/sup&gt;C) dating framework for Lagar Velho is broadly consistent but provides limited constraint on several geoarchaeological complexes (GCs) and does not favour detailed chronological comparisons across all sectors of the site; including the stratigraphically disconnected child burial complex in the east area and the broader archaeological sequence in the central-west area. In this study, we undertake a complementary chronological assessment of Lagar Velho Rock Shelter using single-grain quartz OSL, single-grain quartz TT-OSL and combined U-series/ESR dating of fossil teeth, with the aim of establishing more comprehensive reconstructions of archaeological events and placing the human occupation sequence in a firmer regional climatic context. Expanding on the original chronological study, we also compare the published &lt;sup&gt;14&lt;/sup&gt;C datasets against widely used sample quality indicators (i.e., organic preservation and contamination proxies) to ensure reliable comparisons with our new luminescence and combined U-series/ESR ages. Eight &lt;sup&gt;14&lt;/sup&gt;C samples pass our combined chronological and stratigraphic hygiene criteria and are included in the final dating evaluations. Ten of the twelve optical dating samples produce homogeneous equivalent dose (D&lt;sub&gt;e&lt;/sub&gt;) datasets indicative of suitable daylight exposure. The replicate single-grain TT-OSL D&lt;sub&gt;e&lt;/sub&gt; datasets exhibit more pronounced scatter, consistent with enhanced potential for insufficient bleaching of TT-OSL residual doses in some karst settings. The fossil enamel samples dated using U-series/ESR span relatively low natural dose ranges, necessitating the inclusion of maximum dose (D&lt;sub&gt;max&lt;/sub&gt;)-adjusted dose response curve fitting and additional background noise subtraction to avoid D&lt;sub&gt;e&lt;/sub&gt; biases of up to 13%. Stratigraphically consistent ages (&lt;em&gt;n&lt;/em&gt; = 26) spanning the full archaeological infill sequence are obtained using the four different dating methods, providing a robust interpretive framework and underscoring the significant role of single-grain OSL and combined U-series/ESR dating for refining early Upper Palaeolithic histories of Iberia. Bayesian modelling of the combined chronological dataset reveals a site accumulation history spanning 35,750–23,440 cal. BP and provides improved age constraints on all GCs; particularly the &lt;em&gt;al&lt;/em&gt;, &lt;em&gt;bs&lt;/em&gt;, &lt;em&gt;tc&lt;/em&gt;, &lt;em&gt;gs&lt;/em&gt; and &lt;em&gt;ls&lt;/em&gt; deposits that were previously undated or imprecisely constrained. The age of the child burial complex is refined to 29,410–28,280 cal. BP, potentially occurring within Greenland Interstadial 4. Comparison of the modelled GC ages from the east and west-central areas enables improved temporal correlations of depositional events across stratigraphically disconnected sectors of the site. This analysis suggests that the child burial complex and the Late Gravettian occupation are statistically indistinguishable based on current dating eviden","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101572"},"PeriodicalIF":1.7,"publicationDate":"2024-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000761/pdfft?md5=5bd1228324b22968bcaf56a999ce1690&pid=1-s2.0-S1871101424000761-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539948","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 detailed quartz and feldspar luminescence chronology for the Khonako II loess section (Southern Tajikistan)","authors":"Amélie Challier ,&nbsp;Kristina J. Thomsen ,&nbsp;Redzhep Kurbanov ,&nbsp;Piotr Sosin ,&nbsp;Andrew Murray ,&nbsp;Guillaume Guérin ,&nbsp;Olga Meshcheryakova ,&nbsp;Asliddin Karayev ,&nbsp;Farhad Khormali ,&nbsp;Natalia Taratunina ,&nbsp;Anna Utkina ,&nbsp;Jan-Pieter Buylaert","doi":"10.1016/j.quageo.2024.101571","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101571","url":null,"abstract":"<div><p>Parts of Central Asia have been dominated by high dust flux since the start of the Quaternary. The resulting loess-palaeosol deposits are important archives for landscape and climate changes, but there is a lack of chronological data for the subaerial deposits of Southern Tajikistan. Our study presents a high-resolution luminescence chronology for the Khonako II section in the Khovaling region. Thirty-seven samples were collected from the first ∼8 m of the section, corresponding to the Holocene soil and the upper part of the Loess 1 (L1) unit. We applied quartz OSL dating to the coarse-silt fraction (40–63 μm) and polymineral pIRIR_200,290 dating to the very fine sand fraction (63–90 μm). The polymineral pIRIR_200,290 signal has satisfactory characteristics. The quartz dose response curve displays a non-single exponential growth above ∼100 Gy, thus, the D_e values were estimated by fitting a single exponential function plus linear component to the dose response data. To assess the pIRIR_200,290 residual dose at deposition, we used the offset between our quartz and polymineral chronologies from Khonako II and equivalent doses measured on modern dust samples from Tajikistan and Uzbekistan. The resulting 9.2 ± 0.4 Gy dose was then subtracted from the pIRIR_200,290 doses for final age calculation. The quartz OSL and pIRIR ages are then generally consistent. The obtained high-resolution luminescence chronology shows that the upper part of the L1 unit accumulated during the end of marine isotope stage (MIS) 3 and through MIS 2 (39–20 ka). The average dust accumulation rates (DAR) increased from ∼31 cm ka⁻¹ to 41 cm ka⁻¹ between MIS 3 and MIS 2. The DAR reached a peak of ∼71 cm ka⁻¹ at 21 ka. A hiatus of ∼7–9 ka was then identified between the end of the last glacial maximum (LGM) and the beginning of the Holocene, and the average DAR decreased during the Holocene. Our results indicate a continuous high dust flux in the Khovaling plateau over the last 39 ka, but reworking processes and potential deflation events mark the LGM-Holocene transition. High-resolution luminescence dating studies in Tajikistan are therefore important to detect potential discontinuities in the sequences and provide an independent timescale for interpreting the climate proxies and calculating dust accumulation rates.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101571"},"PeriodicalIF":1.7,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S187110142400075X/pdfft?md5=006d86a782a50d956820c39aaab11be2&pid=1-s2.0-S187110142400075X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483732","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":"Dating the setting of a late prehistoric statue-menhir at Cruz de Cepos, NE Portugal","authors":"I.K. Bailiff ,&nbsp;E. Andrieux ,&nbsp;M. Díaz-Guardamino ,&nbsp;L.B. Alves ,&nbsp;B. Comendador Rey ,&nbsp;L. García Sanjuán ,&nbsp;Maria Martín Seijo","doi":"10.1016/j.quageo.2024.101569","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101569","url":null,"abstract":"<div><p>The emergence of ‘standing stone’ monuments within the European Late Prehistoric landscape is considered to be associated with a pivotal human cultural transition from hunting and gathering to agriculture and permanent settlement, being the earliest monuments currently dated by radiocarbon to the 5th millennium BCE. However, many standing stones were first erected, subsequently collapsed, and then re-erected during the following three millennia. The excavation of the site of an apparently in situ statue-menhir at Cruz de Cepos in NE Portugal provided the rare opportunity in Iberian prehistory to apply radiocarbon and luminescence techniques to establish the date of construction. On the basis of the iconography, the standing stone was assigned to a sculptural tradition of north-western and western Iberia, loosely dated to the Early/Middle Bronze Age (ca. 2000/1900–1250 BCE). The optically stimulated luminescence (OSL) and dosimetry characteristics of quartz extracted from sediment samples taken from locations associated with the socket pit and surrounding backfilling deposits were examined, producing OSL single grain ages at eight locations. Comparison of the OSL and calibrated radiocarbon ages shows very good agreement, with the mid-3rd millennium BCE dates confirming original erection during the Copper Age and not a much later transformation of the monument. These encouraging results indicate that OSL has the potential to provide reliable dating of depositional processes related to the construction process and is suitable for wider application to megalithic monuments of this type.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101569"},"PeriodicalIF":1.7,"publicationDate":"2024-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000736/pdfft?md5=b1708279c507b6fba6b9708182125331&pid=1-s2.0-S1871101424000736-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483730","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":"Evaluating signal bleaching of Al and Ti–Li centers in fluvio-lacustrine sediments of Datong, North China, and its implications for the volcanic eruption chronology","authors":"Hao Ji ,&nbsp;Chun-Ru Liu ,&nbsp;Wen-Peng Li ,&nbsp;Chuan-Yi Wei ,&nbsp;Bhupati Neupane ,&nbsp;Gong-Ming Yin","doi":"10.1016/j.quageo.2024.101568","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101568","url":null,"abstract":"<div><p>Assessing the adequate bleaching of quartz Electron Spin Resonance (ESR) signals at the time of deposition is essential for sediment ESR dating. In this study, we focus on the Datong volcanic group is situated in Datong City, Shanxi Province, and is among the most renowned volcanic groups in China. The eruption within the Datong volcanoes during a geological period resulted in extensive high-temperature lava flow that directly overlaid Quaternary lacustrine deposits and subjected the underlying lacustrine layers to high-temperature heating. Thus, an investigation of the field profile in the Yujiazhai area, southeast of the Datong Volcanic Group, shows a novel approach for assessing the bleaching extent of ESR centers. This is accomplished by comparison of the D_E values of the Al and the Ti–Li centers in partly-heated layer sample. The result reveals that quartz Al and Ti–Li centers in the lacustrine sediments appear to undergo sufficient bleached during transportation and natural bleaching processes in the study area. Furthermore, this study provides insight into the chronology of volcanic eruption in the Yujiazhai area, estimating an eruption age of approximately 300 ka. This volcanic activity most likely corresponds to the third volcanic activity period in the Datong region.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101568"},"PeriodicalIF":1.7,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483729","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 post-IR IRSL dating of an ancient dammed lake upstream of the Ganglai gorge in the upper-middle reaches of Yarlung Tsangpo","authors":"Jingran Zhang,&nbsp;Xilin Cao,&nbsp;Zhigang Zhang,&nbsp;Mengying He,&nbsp;Xinggong Kong,&nbsp;Zhijun Zhao","doi":"10.1016/j.quageo.2024.101570","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101570","url":null,"abstract":"<div><p>The middle reaches of Yarlung Tsangpo, situated on the southern Tibetan Plateau, have experienced extensive river damming events due to glacier advances, resulting in the formation of several ancient dammed lakes. These palaeolakes offer invaluable insights into past hydrological and geomorphological dynamics on the Tibetan Plateau. In this study, we reported a newly identified ancient dammed lake, named the Xiaru palaeolake, located upstream of the Ganglai Gorge in the uppermost segment of the middle reaches of Yarlung Tsangpo, and conducted a pioneer chronological investigation of the lake using K-feldspar post-IR IRSL (pIRIR) dating. Quartz minerals from most lacustrine and fluvial sediments can not provide reliable ages characterized with low intensity and large inter-aliquot scatter in equivalent doses (D_e). In contrast, the K-feldspar exhibited much greater luminescence intensity and narrower D_e distribution using the pIRIR₂₂₅ dating protocol. Residual, dose recovery, and fading tests demonstrated that the pIRIR₂₂₅ signals are well bleached with a relatively low fading rate, making it a more suitable dosimeter for dating applications in the study area. The pIRIR₂₂₅ ages, derived through single aliquots, standard growth curve (SGC), and single grain measurements, reveal a major phase of the Xiaru Lake between 24.1 ± 1.0 ka and 15.8 ± 1.1 ka, that commenced aligning with the global Last Glacial Maximum. Furthermore, one lacustrine sample dated to 29.9 ± 2.2 ka suggests the possibility of multiple damming events in Ganglai Gorge during the last glacial period, although further evidence is required for a comprehensive interpretation.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101570"},"PeriodicalIF":1.7,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539951","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":"Coupled ESR and U-series dating of the northernmost evidence of Gigantopithecus from Jianshi Longgudong site, China","authors":"Fei Han ,&nbsp;Jean-Jacques Bahain ,&nbsp;Qingfeng Shao ,&nbsp;Pierre Voinchet ,&nbsp;Fangfang Tang ,&nbsp;Mi Zhou ,&nbsp;Manchen Huang ,&nbsp;Gongming Yin","doi":"10.1016/j.quageo.2024.101573","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101573","url":null,"abstract":"<div><p><em>Gigantopithecus</em> was a great ape once lived in Southeast Asia and China during the Pleistocene, and the northernmost evidence of its presence is presently known from the Longgupo and Jianshi Longgudong sites located in the West-Hubei and Three Gorges region in Southof China. Here, we report the first radiometric dating by ESR/U-series method on mammalian teeth of Jianshi Longgudong site which was found in 1970s, and renowned by the discovery of both possible hominin and <em>Gigantopithecus</em> fossils in association with undoubted stone artifacts. As the cave site was completely emptied by the successive excavations, the analyzed teeth were selected from museum collections while the dosimetry was established from reworked sediments sampled on the site. The results obtained on two fossil teeth from the lower layer 8 give a weighted mean age of 1512 ± 94 ka, while a mean age of 1044 ± 53 ka was obtained for two other teeth from the upper layer 4. These ESR/U-series dating results, in agreement with the fauna record, are younger than the previous paleomagnetic dating interpretation and suggest that Jianshi Longgudong sequence is younger than the Olduvai subchron and the neighboring Longgupo site dated by the same methods to ca 2.2–2.5 Ma.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101573"},"PeriodicalIF":1.7,"publicationDate":"2024-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539950","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 SPICE Project: Calibrated production rates of cosmogenic 3He and 21Ne in olivine and pyroxene from the 72 ka SP basalt flow, Arizona, USA","authors":"Cassandra R. Fenton ,&nbsp;Samuel Niedermann ,&nbsp;Tibor Dunai","doi":"10.1016/j.quageo.2024.101560","DOIUrl":"10.1016/j.quageo.2024.101560","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The formally named SP lava flow is a quartz-, olivine- and pyroxene-bearing basalt flow that is preserved in the desert climate of northern Arizona, USA. The flow has an &lt;sup&gt;40&lt;/sup&gt;Ar/&lt;sup&gt;39&lt;/sup&gt;Ar age of 72 ± 4 ka (2σ) and has undergone negligible erosion and/or burial, making its surface an ideal site for direct calibration of cosmogenic nuclide production rates. Production rates for cosmogenic &lt;sup&gt;3&lt;/sup&gt;He (&lt;sup&gt;3&lt;/sup&gt;He&lt;sub&gt;c&lt;/sub&gt;) and &lt;sup&gt;21&lt;/sup&gt;Ne (&lt;sup&gt;21&lt;/sup&gt;Ne&lt;sub&gt;c&lt;/sub&gt;) have been determined from SP flow olivine and pyroxene in this study. The error-weighted mean, sea-level, high latitude (SLHL) total reference production rates of &lt;sup&gt;3&lt;/sup&gt;He in olivine and pyroxene have identical values of 135 ± 8 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error) using time-independent Lal (1991)/Stone (2000) (&lt;em&gt;St&lt;/em&gt;) scaling factors. These production rates decrease to identical values of 130 ± 8 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error) when &lt;sup&gt;3&lt;/sup&gt;He measurements are standardized to the CRONUS-P pyroxene standard. The &lt;em&gt;St-&lt;/em&gt;scaled, error-weighted mean, total reference production rates of &lt;sup&gt;21&lt;/sup&gt;Ne in olivine and pyroxene are 48.4 ± 2.9 at/g/yr and 26.5 ± 1.7 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error), respectively, increasing to 49.3 ± 3.0 at/g/yr and 27.0 ± 1.7 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error), respectively, when standardized to the CREU-1 quartz standard. &lt;sup&gt;3&lt;/sup&gt;He and &lt;sup&gt;21&lt;/sup&gt;Ne production rates (&lt;em&gt;St&lt;/em&gt;) overlap within 2σ uncertainty with other &lt;em&gt;St&lt;/em&gt;-scaled production rates in the literature. SLHL &lt;sup&gt;3&lt;/sup&gt;He and &lt;sup&gt;21&lt;/sup&gt;Ne production rates in SP flow olivine and pyroxene are nominally lower if time-&lt;u&gt;dependent&lt;/u&gt; &lt;em&gt;Lm&lt;/em&gt; and &lt;em&gt;Sa&lt;/em&gt; scaling factors are used. Olivine and pyroxene both have identical, error-weighted mean SLHL production rates of 127 ± 8 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error) using &lt;em&gt;Lm&lt;/em&gt; scaling factors and CRONUS-P standardized &lt;sup&gt;3&lt;/sup&gt;He measurements. These production rates decrease to identical values of 110 ± 7 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error) for olivine and pyroxene when using &lt;em&gt;Sa&lt;/em&gt; scaling factors. The &lt;em&gt;Lm&lt;/em&gt;-scaled, error-weighted mean, total reference production rates of &lt;sup&gt;21&lt;/sup&gt;Ne in olivine and pyroxene are 48.1 ± 2.8 at/g/yr and 26.4 ± 1.7 at/g/yr (2&lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mi&gt;σ&lt;/mi&gt;&lt;mover&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;mo&gt;‾&lt;/mo&gt;&lt;/mover&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;; standard error), respectively, when standardized to the CREU-1 quar","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101560"},"PeriodicalIF":1.7,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141416417","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}