Quaternary Geochronology最新文献

{"title":"Incision rate of the Manas River, northern Tian Shan: Insight from luminescence dating of terrace cobbles","authors":"Qi Liu ,&nbsp;Jie Chen ,&nbsp;Jintang Qin ,&nbsp;Huili Yang ,&nbsp;Jinfeng Liu ,&nbsp;Tao Li ,&nbsp;Ning Di ,&nbsp;Kechang Li ,&nbsp;Yicheng Pu ,&nbsp;Shenghua Li","doi":"10.1016/j.quageo.2024.101593","DOIUrl":"10.1016/j.quageo.2024.101593","url":null,"abstract":"<div><p>Fluvial deposits in piedmont environments are usually enriched by cobbles, which can be used for luminescence dating, as an alternative to the conventionally employed sand-sized minerals. In this study, a modified multi-elevated-temperature post-infrared infrared stimulated luminescence (MET-pIRIR) procedure was employed to establish luminescence-depth profiles of upper and lower sides of fluvial cobbles and obtain the burial ages of cobbles from high terrace of the Manas River in northern Chinese Tian Shan. The age-stimulation temperature (A-T) plateau was combined with the conventional age-depth (A-D) plateau in luminescence-depth profile to evaluate the reliability of burial ages of cobble luminescence dating from the aspects of fading and bleaching of signals. When the signal was only bleached to a limited depth given rise to no A-D plateau, the A-T plateau could serve as an internal-check to evaluate the degree of bleaching of the luminescence signal just through a single rock slice. Our results showed that self-evidenced and reliable buried ages of fluvial cobbles could be determined by only using first sub-surface rock slice in the presence of A-T plateau. Thereafter, the deposition age of cobble from top of T6 terrace and bottom of T5 terrace were ∼23.6–24.0 ka and ∼22.7 ka, respectively, inferring a very fast incision rate of ∼20 mm/a. The observed variability in bleaching depth between upper and lower sides across different cobble samples suggested complex transport dynamics.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101593"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141716393","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 the Neanderthal environment: Detailed luminescence chronology of a palaeochannel sediment core at the Palaeolithic site of Lichtenberg in the Lower Saxony, northern Germany","authors":"Neda Rahimzadeh ,&nbsp;Michael Hein ,&nbsp;Brigitte Urban ,&nbsp;Marcel Weiss ,&nbsp;David Colin Tanner ,&nbsp;Azra Khosravichenar ,&nbsp;Sumiko Tsukamoto ,&nbsp;Tobias Lauer","doi":"10.1016/j.quageo.2024.101564","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101564","url":null,"abstract":"<div><p>Northern Germany is famous for its numerous Neanderthal (Middle Palaeolithic) archaeological sites and well-preserved palaeoclimate records. Nevertheless, our understanding of how hominins responded to climate fluctuations and adapted to changing environments in this region remains limited because there are only a few reliable, highly-resolved chronological frameworks of long stratigraphic successions. Most of the Middle Palaeolithic sites in this region lack a reliable chronostratigraphy beyond the radiocarbon dating range. In this study, we present a high-resolution optically stimulated luminescence (OSL) chronology derived from a ∼21 m long sediment core (Li-BPa) that was drilled in close proximity to the known Neanderthal site of Lichtenberg. Quartz OSL dating was applied to the upper 6.5 m of the core. Subsequently, the obtained quartz OSL ages were compared with feldspar post-infrared (IR) IRSL (pIRIR) measured at 290 °C (pIRIR₂₉₀), pulsed IR₅₀ (pre-pIRIR₂₂₅), and pulsed pIRIR₂₂₅ ages to select a suitable feldspar signal to date older samples. A comparison of the quartz and feldspar ages indicates that only fading-corrected pulsed IR₅₀ (pre-pIRIR₂₂₅) and pIRIR₂₂₅ ages agree well with quartz OSL ages. Finally, the age framework of the sediment sequence was established based on the 11 quartz OSL ages and 23 fading-corrected pulsed IR₅₀ (pre-pIRIR₂₂₅) and pulsed pIRIR₂₂₅ ages. The resulting Bacon age-depth model agrees with litho- and biostratigraphic designations, indicating that the whole sequence was deposited between ca. 275 ka and ca. 24 ka, corresponding to the Saalian to Weichselian periods.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101564"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000682/pdfft?md5=34bd8060f7b38ebd5ba538a939caf76e&pid=1-s2.0-S1871101424000682-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141483728","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":"Unraveling the deposition and incision paces of alluvial fan-river system by using single grain K-feldspar luminescence dating","authors":"Kechang Li ,&nbsp;Jintang Qin ,&nbsp;Jie Chen ,&nbsp;Jinfeng Liu ,&nbsp;Yuan Yao","doi":"10.1016/j.quageo.2024.101587","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101587","url":null,"abstract":"<div><p>Alluvial river in the piedmont area deposits and incises cyclically, in response to both exogenetic and endogenetic forcing across a range of timescales. The paces of these processes unveil the mechanisms governing the evolution of alluvial fan-river system and affect the policy for river management. Numerical simulation suggests that the incision of alluvial river is much faster than the deposition process. However, the field observations are rare. Alluvial rivers entrench up to 300 m into the alluvial fans built pre-Holocene on the northern piedmont of Chinese Tianshan, which provide ideal sites to unveil the pace of alluvial fan-river evolution. Jingou River is one of these rivers, with four levels of terraces identified at the downstream area. These terrace deposits are characterized by a complex of upper very coarse gravels and cobble (VCGC) unit and lower medium and coarse gravels (MCG) unit. In this study, potassium-feldspar (K-feldspar) single grain pIR₁₁₀IR₁₇₀ luminescence dating procedure was employed to date the samples taken from sandy lens of both upper VCGC and lower MCG units, for which the depositional ages are supposed to be associated with the fan-building and river incision processes, respectively. The luminescence ages of the lower MCG unit suggests a gradual fan building phase between 16 ± 1.9 ka and 8.1 ± 0.9 ka, while the ages of the upper VCGC unit cluster around ∼5.2 ka rather than a monotonic decrease towards low level terraces. Several scenarios are discussed with respect to the attained age sequences to unravel the pace of deposition and incision of Jingou River, of which the asymmetric aggradation and incision is more preferred and echoes to the finding of previous numerical investigation.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101587"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141606250","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":"Variance in pIRIR signal bleaching for single grains of feldspar","authors":"Jungyu Choi,&nbsp;Elizabeth Chamberlain,&nbsp;Jakob Wallinga","doi":"10.1016/j.quageo.2024.101577","DOIUrl":"10.1016/j.quageo.2024.101577","url":null,"abstract":"<div><p>Evaluating remnant doses is crucial for luminescence dating of late Holocene sedimentary deposits, especially when slow-bleaching feldspar pIRIR signals are employed. Previous research demonstrated that the bleaching capacity varies between individual grains, but only a few attempts have been made to quantify this. In this research, we evaluate variance in bleachability at a single-grain level for a low-temperature pIRIR signal from K-rich feldspar extract. The research is conducted through experimental exposure to natural sunlight of two natural samples. The degree of zeroing is monitored over exposure times up to 100 min and related to the recuperation values obtained on the same grains from the standard pIRIR sequence. We find a positive correlation between recuperation doses of grains and their residual doses, which suggests that recuperation provides a proxy for grain bleachability. In addition, we combine our dataset of bleachability with information on the difference between IRSL₅₀ and pIRIR₁₇₅ equivalent doses determined on the same grain (D_e ratio), which allows us to identify grains for which light exposure was too limited to reset both signals. The results demonstrate that prior inheritance, light exposure, and grain bleachability all may impact the residual dose of grains, resulting in overdispersion in equivalent dose distributions. Combining the assessment of bleachability with the information on the D_e ratio can support the identification of best-bleached grains in a natural sample. Finally, the different bleachability of individual grains demonstrates that it may not be advisable to subtract the mean residual dose from paleodoses obtained with a minimum age model and for Holocene-aged deposits.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101577"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000815/pdfft?md5=0d72e0cb509be2bd22390f4a7b8dbeee&pid=1-s2.0-S1871101424000815-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141566613","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":"Extended-range luminescence and ESR dating of Iberian fluvial terraces (Duero and Guadiana basins) associated with the Lower Palaeolithic sites of La Maya I, II, III, Burganes and Albalá (west-central Spain)","authors":"Martina Demuro ,&nbsp;Lee J. Arnold ,&nbsp;Mathieu Duval ,&nbsp;Alicia Churruca Clemente ,&nbsp;Manuel Santonja ,&nbsp;Alfredo Pérez-González","doi":"10.1016/j.quageo.2024.101567","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101567","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The major river basins of the Iberian Peninsula that drain towards the Atlantic coast contain extensive Lower Palaeolithic (Acheulean) records associated with well-preserved fluvial terrace sequences. These open-air archaeological records are often difficult to constrain chronologically due to a lack of suitable material for dating (e.g., faunal remains) or because their Middle Pleistocene antiquity precludes the use of otherwise routinely applicable geochronometric techniques such as conventional optically stimulated luminescence (OSL) dating. As a result, many important Iberian Acheulean sites lack precise and accurate chronologies, and their existing temporal frameworks are based solely on morphostratigraphic correlations with regional fluvial terrace systems. Here we present the first application of extended-range luminescence dating – namely multi-grain post-infrared infrared stimulated luminescence (pIR-IRSL) dating of K-feldspars and single-grain thermally transferred-OSL (TT-OSL) dating of quartz – to a series of terrace sequences in the Duero basin (central sector) and Guadiana basin, as well as associated Lower Palaeolithic sites of La Maya I, II and III along the Tormes River, Burganes (and related sites) along the Tera River, and Albalá along the Guadiana River. Additionally, we present results of a parallel electron spin resonance (ESR) quartz dating study of the Tormes River terrace (Duero basin), which has been undertaken independently on the same samples to enable stratigraphically paired dating comparisons. Our study indicates that sedimentary quartz from this sector of the Duero basin produces very weak TT-OSL signals, variable Al signal repeatability and below-average Ti signal fitting uncertainties, though it is still possible to determine consistent comparative ages using the measurements protocols employed here. For samples where both pIR-IRSL and TT-OSL signals were measured, the paired luminescence dating ages are in agreement at 1σ. Agreement between the quartz ESR and TT-OSL ages is also observed for one sample from the Tormes River. However, the ESR signals (both Al and Ti) of a second sample showed insufficient bleaching and age overestimation in comparison to the paired TT-OSL dataset. Comparison of our latest dating results with published chronological datasets point to some fluvial terraces of the Duero basin potentially having diachronous formation histories. Despite this, our combined chronological results show that the terrace systems are chronologically ordered and suggest that, regionally, the +8 to +34 m terraces likely post-date marine isotope stage (MIS) 10, whilst the +50 m terraces formed prior to, or during, MIS 10. The related Acheulean sites that contain lithic material in stratigraphic position are dated to MIS 9–7 (193–314 ka at 2σ age range), and temporally overlap with the early Middle Palaeolithic records in the Duero basin, also dated here to MIS 8–7 (or 159–259 ka at 2σ). Our results are ","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101567"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000712/pdfft?md5=6ca5a82de3dee180d0acb2153e2fd659&pid=1-s2.0-S1871101424000712-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539946","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":"2024-08-01","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":"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":"2024-08-01","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}

{"title":"Sedimentation history linked to global change in the alpine Damqu Wetland of the Yangtze River headwater in interior Tibetan Plateau","authors":"Qinjing Shen ,&nbsp;Xinqi Feng ,&nbsp;Yinjun Zhou ,&nbsp;Penghui Lin ,&nbsp;Yuexin Liu ,&nbsp;Yuansen Lai ,&nbsp;Junfeng Han ,&nbsp;YuJiao Liu ,&nbsp;Yixuan Wang ,&nbsp;Shuai Zhu ,&nbsp;Zhijing Li ,&nbsp;Zhongping Lai","doi":"10.1016/j.quageo.2024.101598","DOIUrl":"10.1016/j.quageo.2024.101598","url":null,"abstract":"<div><p>Located in the interior of the Tibetan Plateau (TP) and at the headwaters of the Yangtze River, the Damqu Wetland ranks among the world's highest and is highly sensitive to global climate change. Due to its remoteness and harsh, uninhabitable conditions, the sedimentological and geomorphological studies are still absent by far. Establishing a reliable chronology for sediments is crucial for this unique geographic region. Here we initiated this effort and focused on two riverbank profiles, located in the southeastern of the alpine Damqu Wetland, DQ1 (4.8 m in depth) and DQ2 (3.3 m in depth). A combination of chronological methods, including quartz Optically Stimulated Luminescence (OSL), K-feldspar post-IR InfraRed Stimulated Luminescence (pIRIR), and radiocarbon dating methods, as well as magnetic susceptibility and particle size analysis, were conducted on these profiles to establish the depositional history and reveal the palaeoenvironmental conditions of the Damqu Wetland. The dating results indicate that profiles DQ1 and DQ2 were deposited during ∼59–0.20 ka and ∼265–1.12 ka, respectively. It is interesting to note that the D₀ of quartz OSL growth curve has a value as high as 129 Gy. Both profiles exhibit depositional hiatuses, with time gaps between 37 ± 2 and 2.9 ± 0.2 ka for DQ1 and between 265 ± 16 and 4.8 ± 0.4 ka for DQ2, likely due to fluvial erosion during the period of from deglaciation to middle Holocene. The resumed sediment accumulation since the mid-late Holocene is probably mainly attributed to declined fluvial erosion in response to reduced rainfall. The darker sediment layers at depths of 0.9 m–0.7 m and 0.3 m–0.1 m in DQ2, combined with magnetic susceptibility and particle size analyses results, suggest two regional climatic optimum periods at around 4.5 ka and 1 ka. Overall, our research establishes the chronological framework of the Damqu wetland since the Late Quaternary and highlights the significant impact of climate changes on fluvial processes and wetland evolution in the remote interior TP.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101598"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141715854","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":"Feasibility of rock surface luminescence dating technique for measuring the burial ages of unheated flints","authors":"L. Ageby ,&nbsp;S. Jakathamani ,&nbsp;A.S. Murray ,&nbsp;M. Jain ,&nbsp;E.F. Rades","doi":"10.1016/j.quageo.2024.101566","DOIUrl":"https://doi.org/10.1016/j.quageo.2024.101566","url":null,"abstract":"<div><p>While flint and similar materials are some of the most often preserved finds from the pre-historic archaeological records, trapped charge techniques can currently only be used on heated flint pieces. Here, we investigate if rock surface luminescence dating using the light-sensitive OSL signal is applicable to unheated flint nodules and cobbles by measuring OSL signal-depth profiles in flint samples collected from eastern Zealand and Møn, Denmark. We demonstrate that a detectable, natural OSL signal is present in the centre in eight out of the nine investigated flint samples. Additionally, the OSL signal had been bleached to various depths at the flint surfaces, which were exposed to daylight at the time of sampling. The field-saturated OSL is 50% or lower compared to the laboratory OSL after a 6 kGy dose was administered to field-saturated flint slices; this discrepancy could be related to signal loss occurring over geological time scales, but the exact nature of the mechanism of signal loss remains unclear. The presence of a natural OSL signal that bleaches into the flint when exposed to daylight suggests that rock surface dating of unheated flints is feasible, and the method should be further tested on known-age samples.</p></div>","PeriodicalId":54516,"journal":{"name":"Quaternary Geochronology","volume":"83 ","pages":"Article 101566"},"PeriodicalIF":1.7,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1871101424000700/pdfft?md5=6e03f93bc81a34a261f4f27469999736&pid=1-s2.0-S1871101424000700-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141539949","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":"2024-08-01","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}