Quaternary Science Reviews最新文献

{"title":"Sediment recycling during the Holocene marine transgression in Ría de Vigo (NW Iberia): multiproxy evidence and environmental implications","authors":"C. Muñoz Sobrino , A. Castro-Parada , V. Cartelle , N. Martínez-Carreño , C. Delgado , N. Cazás , I. Lázaro , S. García-Gil","doi":"10.1016/j.quascirev.2024.109006","DOIUrl":"10.1016/j.quascirev.2024.109006","url":null,"abstract":"<div><div>A new multiproxy study of a 155-cm sediment core located in Ría de Vigo (NW Iberia) recording the transgressive and highstand system tract of the Holocene sea-level rise is presented. New data described include grain size, geochemical analyses, high-resolution qualitative/quantitative analyses of pollen, non-pollen palynomorphs and dinoflagellate cysts content, the qualitative evaluation of diatoms at different key levels and the reconsideration of some seismic interpretations. Besides, 14 radiocarbon dates were obtained from shells and pollen extracts. This new evidence revealed that notable changes in the sedimentation rates and the relative abundance of the different types of palynomorphs occurred during the Holocene. The sediment core studied shows anomalous pollen successions, including unexpected <em>Pinus</em> pollen peaks, during the Early and Middle-Holocene. Differential dating revealed that those anomalous successions correspond to conspicuously aged sediment that has inverted pollen chronologies. Thus, these facies may constitute evidence of redeposition of ancient upland sediments, formed above the ancient coastline at different intervals comprised between the end of the Last Glacial Maximum and the early stages of the Lateglacial, which were rich in very resistant pollen types (<em>Pinus</em>). Dinoflagellate cyst records in combination with the non-reworked pollen evidence reveal a reliable climatic seesaw during the Holocene, includingwet stormy periods of prevailing mixed waters, with strong development of <em>Lingulodinium</em> and high accumulation rates in dinoflagellate cysts, which alternate with other sparsely stormy and drier phases, characterised by the coastal upwelling intensification, well-stratified waters, and increases in <em>Bitectatodinium</em> and <em>Spiniferites</em> spp. but low accumulation rates in dinoflagellate cysts. These climatic dynamics, including a millennial drier cool period that occurred just after the Thermal Optimum are consistent with previous evidence obtained in other limnetic systems in the Iberian Peninsula. Furthermore, there is a delay between the two phases with the highest marine contribution to sediment (ca. 11.0-8.2 and ca. 4.0–3.0 cal ka BP) and the subsequent warm stages when the relative sea level stabilises: the Thermal Optimum (8.0–6.0 ka BP) and the 2.5-0.5 ka BP interval, respectively. Changes in <em>Pinus</em> pollen concentrations and grain size recorded in the postglacial sediments suggest that some upland ancient (Lateglacial) pollen evidence might be remobilised, especially during stages of upwelling intensification, and then resedimented in the seabed. Further studies will be needed to determine if the significant differences existing between the <em>Pinus</em> pollen grain sizes respond to climatic variations affecting the region or have been the result of any replacement of pine species in the area. Nonetheless, <em>Pinus</em> pollen evidence almost disappeare","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109006"},"PeriodicalIF":3.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Hydroclimate modulation of central-eastern Mexico by the North Atlantic subtropical high since the little ice age","authors":"Patricia Piacsek ,&nbsp;Juan Pablo Bernal ,&nbsp;María del Pilar Aliaga-Campuzano ,&nbsp;Luis Bernardo Chavero ,&nbsp;Fernanda Lases-Hernández ,&nbsp;Francisco William da Cruz ,&nbsp;Nicolás Misailidis Strikís ,&nbsp;Liliana Corona-Martinez ,&nbsp;Veronica M. Ramirez ,&nbsp;Marília Harumi Shimizu ,&nbsp;Herminio Rojas","doi":"10.1016/j.quascirev.2024.108981","DOIUrl":"10.1016/j.quascirev.2024.108981","url":null,"abstract":"<div><div>We reconstructed the hydroclimate of central-eastern Mexico over the last 700 common era (CE) based on inferences from multi-proxies from a stalagmite (K-Inc) collected at Karmidas cave, eastern México. Projections on hydroclimate variability in Mexico raise concerns about possible future occurrences of severe droughts and seasonal water balance fluctuations related to increased global temperatures caused by anthropogenic climate change (Murray-Tortarolo, 2021). The eastern region influences the production and supply of food to Mexico. Simulations of past climates, validated by paleoclimate records, yield valuable perspectives on climate change and enhance our understanding of future projections. However, the paucity of paleoclimatic records hinders understanding past hydroclimatic variations and their climatic mechanisms in eastern Mexico. Our record covers the Little Ice Age (LIA) through the Historical Interval (HI), a crucial period for understanding the climate repercussions spanning the transition from Earth's climatic history to the post-industrial era. The reduced intensity of the North Atlantic Subtropical High (NASH) during the LIA enabled a prominent negative phase of NAO-like variability from 1600 CE until the end of LIA. Consequently, preferent meridional airflow within the continent fosters the encounter of moisture-laden intrusions with the increased frequency of cold surges as the occurrence of frontal rain in eastern Mexico, impairing the amount effect on the K-Inc δ¹⁸O record. However, after the artificial opening of the cave in 1910 CE, the δ¹⁸O records of K-Inc began to exhibit a ∼20-year oscillatory periodicity. In this context, the trace elements of K-Inc help elucidate the climatic conditions that governed the precipitation regime during the investigated period. The visual alignment between the zonal sea surface temperature (SST) variability in the eastern equatorial Pacific (EEP) and the trace elements (Sr/Ca and Ba/Ca) of K-Inc reveals their relationship. Warm zonal SST in the EEP appears to be associated with changes in the length of the winter and summer seasons in eastern Mexico during the LIA. In contrast, over the HI, the trace elements of K-Inc show an anti-phase response to Warm zonal SST in the EEP, denoting wetter climate conditions at the vicinities of Karmidas Cave. This configuration led to questioning the influence of SST zonal variability in the EEP during the HI, which was probably masked by more relevant climate forcing. Our findings enabled us to draw climate scenarios by addressing the main climate drivers in our records.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108981"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Beryllium ten production and relative paleointensity for the past 1.2 million years","authors":"Jean-Pierre Valet ,&nbsp;Tatiana Savranskaia ,&nbsp;Ramon Egli ,&nbsp;Quentin Simon ,&nbsp;Franck Bassinot ,&nbsp;Nicolas Thouveny","doi":"10.1016/j.quascirev.2024.108993","DOIUrl":"10.1016/j.quascirev.2024.108993","url":null,"abstract":"<div><div>Composite curves of relative paleointensity document the evolution of the geomagnetic field intensity during the past 1.2 Million years. Several records of production of ¹⁰Be cosmogenic isotope from the ¹⁰Be/⁹Be ratio (referred to as Be-ratio) covering this period have also been acquired. We add here new ¹⁰Be records to the database and produce a first composite curve of beryllium production (Be-1200) for the past 1.2 Myr. We compare Be-1200 with Sint-2000 (Valet et al., 2005) and PISO-1500 (Channell et al., 2009) paleointensity curves. The three curves show similar patterns, but frequently different amplitudes. The variations in dipole moment values derived from the Sint-2000 and PISO-1500 relative paleointensity composite curves were then confronted with the geomagnetic dipole moment record derived from the Be-1200 record. The predicted amplitudes of dipole moment loss during geomagnetic excursions reconstructed from the measured in the Be-1200 record are generally compatible with those deduced from SINT-2000 and PISO-1500. More specifically, the three datasets indicate very low field intensities during the Laschamp, that are consistent with the existence of reverse directions, and to a lesser extent during other events (Iceland basin, Calabrian Ridge/West Eifel events). The two paleointensity curves show a decrease in field intensity of at least 80–90% during the reversals. The Be- derived dipole moment decreases meet the predictions for the Brunhes/Matuyama transition, but are significantly smaller than expected for the two Jaramillo transitions. Such limited variability may result from the impact of environmental factors on the Be ratios, as suggested in a previous study of the last reversal (Savranskaia et al., 2021). This comparative study of ¹⁰Be records and relative paleointensity records reveals that, in particular cases, Be ratio records can underestimate the amplitude of virtual geomagnetic dipole variation. With their respective strengths and weakness, these two approaches provide similar first-order patterns relevant to the common control by the geomagnetic moment variation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108993"},"PeriodicalIF":3.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142440900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracking orbital and suborbital climate variability in the westernmost Mediterranean over the past 13,000 years: New insights from paleoperspectives on marine productivity responses","authors":"Ricardo D. Monedero-Contreras ,&nbsp;Francisca Martínez-Ruiz ,&nbsp;Francisco J. Rodríguez-Tovar ,&nbsp;José M. Mesa-Fernández ,&nbsp;Francesca Sangiorgi","doi":"10.1016/j.quascirev.2024.109001","DOIUrl":"10.1016/j.quascirev.2024.109001","url":null,"abstract":"<div><div>This study presents a comprehensive analysis of a sediment record from the Western Alboran Basin (core GP04PC), utilizing palynological and geochemical tools to investigate marine productivity responses to orbital and suborbital climate variability over the past 13,000 years. High productivity during the Younger Dryas humid phase (∼12.4–11.7 ka) and the Holocene humidity optimum (∼10.5–8.5 ka) was driven by increased local river discharges resulting from rapid mountain glaciers melting and enhanced regional precipitation. During the late Holocene, frequent flood events linked to negative North Atlantic Oscillation (NAO) incursions potentially led to multicentennial-scale productivity increases. The findings indicate that periods characterized by wet regional conditions and increased river run-off, influenced by orbital (e.g., insolation cycles) and suborbital factors (e.g., NAO and Atlantic Meridional Overturning Circulation changes), consistently enhanced marine productivity in the Western Alboran Basin. The study also reveals that the current high productivity and carbon export in the Western Alboran Basin are maintained by active upwelling and downwelling systems driven by a persistent positive NAO phase following the southward migration of the Intertropical Convergence Zone (ITCZ) that occurred around 6.5 ka. Furthermore, geochemical proxies support a strong detrital influence on trace metal concentrations, including barium (Ba), in deep Western Alboran sediments during the Holocene. This limits the use of Ba/Al ratios for accurately reconstructing productivity changes and highlights the importance of dinocyst analysis as a complementary tool for robust marine productivity reconstructions in this region. These observations provide valuable paleoperspectives on marine ecosystem responses to climate variability, contributing to the development of robust long-term productivity models essential for adapting to ongoing environmental changes in the region, and demonstrating the strong influence of North Atlantic climate and ocean dynamics on centennial-scale productivity oscillations in this region.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 109001"},"PeriodicalIF":3.2,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 high-resolution tephra record from Castiglione maar reveals the timing and unveils cryptic eruptions over the most recent volcanic activity at Colli Albani, central Italy","authors":"Bianca Scateni ,&nbsp;Gianfranco Di Vincenzo ,&nbsp;Giuseppe Re ,&nbsp;Biagio Giaccio ,&nbsp;Gaia Siravo ,&nbsp;Alessandra Smedile ,&nbsp;Patrizia Macrì ,&nbsp;Alessio Di Roberto","doi":"10.1016/j.quascirev.2024.108989","DOIUrl":"10.1016/j.quascirev.2024.108989","url":null,"abstract":"<div><div>Integrating proximal and medial-distal tephra records from continuous sedimentary archives has recently proven to be crucial for obtaining more complete and highly resolved stratigraphic and chronological histories of explosive activity, allowing a detailed and accurate assessment of volcanic hazards. The sedimentary succession from the Castiglione maar, about 20 km east of Rome, hosts a long and continuous lacustrine record extending back to ca. 365 ka, including a number of tephra layers derived from the explosive activity of peri-Tyrrhenian volcanic centres. An integrated tephrochronological investigation, which combines stratigraphic, textural, mineralogical, geochemical and ⁴⁰Ar/³⁹Ar geochronological analyses, was conducted on six tephra layers occurred between 11 and 15 m-depth of the Castiglione composite section. This section records the history of the most recent explosive activity of the Colli Albani volcano and relates to the Albano maar. Results reveal that the Albano maar volcanic history actually comprises six explosive events that are younger than previously thought and occurred in a narrower time interval. Specifically, ⁴⁰Ar/³⁹Ar ages determined on four of the six tephra, along with the modelled ages for the remaining two, indicate that the eruptive activity of the last sub-cycle of the Albano maar lasted 3.4 +0.4/-0.6 ka, and occurred between 37.71 ± 0.34 ka (⁴⁰Ar/³⁹Ar age of the first eruption) and 34.34 +0.25/-0.45 ka (modelled age of the last eruption). Results refine the history of the most recent explosive activity at Colli Albani volcano and underscore the importance of studying tephra preserved in medial-distal continuous sedimentary archives for a comprehensive reconstruction of the eruptive history. Based on the data collected, the previously unrecognised explosive eruptions were likely of medium magnitude but sufficiently large to produce highly fragmented and widely dispersed ash. We argue that these new findings should be considered for an updated long-term hazard assessment of the Colli Albani volcanic area. Results, and especially the new high-precision ages, also allow to improve the tephrochronological framework in the dispersal area of the Albano tephra, including the iconic paleoclimatic archives of Monticchio and Fucino.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108989"},"PeriodicalIF":3.2,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Surges of the Black Rapids Glacier tracked climate over the last 600 years","authors":"D.H. Mann ,&nbsp;P.R. Wilson ,&nbsp;B.V. Gaglioti ,&nbsp;P. Groves ,&nbsp;M.E. Young","doi":"10.1016/j.quascirev.2024.108969","DOIUrl":"10.1016/j.quascirev.2024.108969","url":null,"abstract":"<div><div>Deposits of surge-type glaciers are widespread in the glacial geologic record; however, it is unclear how climate changes occurring at time scales of decades to centuries affect surge-type glaciers. Here we reconstruct the history of the Black Rapids Glacier (BRG) in the eastern Alaska Range since AD 1400 using a combination of geomorphology, stratigraphy, lichenometry, radiocarbon dating, and dendrochronology. Moraines in the glacier's foreland record four advances, all of which left deposits typical of surging glaciers. A surge in the AD 1600s dammed a lake which drained in an outburst flood ca. AD 1703-04. Another outburst flood from a larger glacier-dammed lake occurred in the AD 1400s. Based on the BRG's observed glaciology and its history over the last several centuries, its surge cycles have varied between 80 and 120 years. Between AD 1400 and 1900, the most extensive surges of the BRG coincided with minima in the Seuss / de Vries solar cycle when non-surging glaciers in the region also advanced. Synchroneity between the BRG, solar minima, and non-surging glaciers is surprising given that the terminus of the BRG was largely unresponsive to climate for 80–120 years between surges. One explanation is that the BRG's surge cycle shortened during the Little Ice Age (LIA, ca. AD 1300–1900) to the point that its climate-response lag resembled that of neighboring, non-surging glaciers. Although the reconstructed chronology of the BRG shows no indication of the surge cycle decreasing during the LIA, fading of the record with time makes it difficult to exclude this possibility. Another explanation is that the BRG's 80- to 120-year cycle is the result of tuning by the solar cycle over the course of millennia. Tuning occurred when quiescent phases that coincided with solar minima were shortened because of faster replenishment of the glacier's reservoir zone. The opposite occurred when the glacier's quiescent phases coincided with solar maxima. The net result was to align the surge cycle of the BRG with solar minima. Some combination of shortened surge cycles during the LIA and tuning by the solar cycle may be why the glacial-geologic record of this particular surge-type glacier provides a surprisingly dependable record of regional climate over the past 600 years.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108969"},"PeriodicalIF":3.2,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 6000-year high-resolution composite record of El Niño-related drought in subtropical southeast Africa","authors":"Marc Humphries ,&nbsp;Kei Prior ,&nbsp;Andrew Green ,&nbsp;Derrick Vaughn","doi":"10.1016/j.quascirev.2024.108992","DOIUrl":"10.1016/j.quascirev.2024.108992","url":null,"abstract":"<div><div>El Niño–Southern Oscillation (ENSO) extremes have a major impact on global temperature and rainfall patterns, triggering severe droughts and floods in many regions of the world. Paleoclimate records reveal significant changes in ENSO activity at centennial and millennial scales, but uncertainty remains regarding the exact nature of these variations during the Holocene and how they impacted climate patterns across different regions. Here we present a highly resolved sedimentary record from Lake Bhangazi North on the subtropical east coast of South Africa, where modern-day rainfall variability is profoundly influenced by ENSO through teleconnections mediated by the Walker Circulation. Stratigraphic and inorganic geochemical proxies at Lake Bhangazi North provide evidence for significant fluctuations in the local hydrological regime, characterised by extended intervals of aridity. Our findings corroborate independent sedimentary evidence from nearby sites at Lake Muzi and Mkhuze Delta, allowing for the generation of a composite proxy record of drought for the region. This record provides compelling evidence for the occurrence of several major drought events at ∼5100–4200, 3600–2700, 1900–1700 and ∼990 cal yr BP. The timing of these distinctive events exhibits striking correspondence with the ENSO proxy sedimentary record from Laguna Pallcacocha, Ecuador. We propose that El Niño, impacting moisture convergence over the subtropical eastern region of South Africa, was the primary driver of drought in the region over the mid-to-late Holocene. This hypothesis is further supported by stalagmite records from northwest Madagascar that reveal pronounced shifts towards wetter conditions coincident with major drought events in our study area, consistent with the modern rainfall anomaly pattern associated with ENSO. Our findings suggest that major aridity phases observed in records from the east coast of South Africa likely reflect large-scale shifts in regional moisture transport across subtropical southeastern Africa, driven by fluctuations in ENSO conditions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108992"},"PeriodicalIF":3.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"From a coastal plain to an anthropized fluvial valley (NW Brittany, France): 7.3 kyr of paleoenvironmental evolution from sedimentological, palynological and paleogenomic perspectives","authors":"Ophélie David ,&nbsp;Muriel Vidal ,&nbsp;Aneta Gorczyńska ,&nbsp;Aurélie Penaud ,&nbsp;Yvan Pailler ,&nbsp;Clément Nicolas ,&nbsp;Evelyne Goubert ,&nbsp;Pierre Stéphan ,&nbsp;Morgane Ollivier ,&nbsp;Frédérique Barloy-Hubler","doi":"10.1016/j.quascirev.2024.108983","DOIUrl":"10.1016/j.quascirev.2024.108983","url":null,"abstract":"<div><div>Over the Holocene (last 11.7 kyr), the Brittany coastal region has undergone major changes in response to rising sea level, climatic fluctuations and increasing anthropogenic influence. This study aims to i) accurately reconstruct the paleoenvironmental evolution of a site located on the north Brittany coast (NW France), a sector that has not been previously investigated thoroughly, and ii) improve the detection of the anthropogenic signature in paleoenvironmental records by using a multidisciplinary approach. To achieve these goals, we made the first cross-correlated study in coastal Brittany region, integrating sedimentological (grain-size, X-ray fluorescence), palynological (pollen grains), and paleogenomic (on plant and mammal sedimentary ancient DNA or sedaDNA) data, which we based two 7.3 kyr-long sedimentary sequences recovered from the Kerallé valley (Plouescat, NW Brittany).</div><div>First, sedimentary and vegetation trajectories allowed us to reconstruct the evolution of past depositional environments in the inner part of the Kerallé valley. The data show a progressive sedimentary infilling of the former alluvial plain, subjected to marine incursion between 7.3 and 6 cal ka BP, up to a continental area, totally disconnected from tidal influence since 5.4 cal ka BP. Second, the analysis of plant and mammal sedaDNA provided a complementary tool to the pollen analysis, enhancing our ability to accurately detect past land-use practices. In the upstream part of the Kerallé system, anthropogenic influence remained scarce until the late Neolithic and seemed to be restricted to the coast, as also indicated by archaeological remains. The first significant human-driven changes in plant community composition likely date back to 4.5 cal ka BP (i.e., late Neolithic), as also shown by the presence of domesticated mammal sedaDNA, both being in agreement with the documented settlement by the first metal-working societies (Bell Beaker culture) in the Plouescat area. From then until 4 cal ka BP (i.e., early Bronze Age), human pressure became more obvious, with the steadily increase in anthropogenic pollen indicators, while sedaDNA of plants and mammals were affected by preservation biases. At 2.7 cal ka BP (i.e., Iron Age), a new anthropic threshold was characterized by maximal forest clearing leading to significant human-induced soil erosion across the Kerallé watershed. Since then, at the local scale of our study, both vegetation dynamics and the presence of domesticated mammals observed by sedaDNA attest to the development of pastoralism.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108983"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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":"Divergent responses of peatland development and carbon accumulation to volcanic eruptions on the Changbai Mountain, Northeast China","authors":"Qiulei Yan ,&nbsp;Zicheng Yu","doi":"10.1016/j.quascirev.2024.108987","DOIUrl":"10.1016/j.quascirev.2024.108987","url":null,"abstract":"<div><div>Peatlands are an important carbon reservoir of terrestrial ecosystems and play a key role in the global carbon cycle. Many peatlands exist in volcanic terrains, but we still lack a systematic understanding of the effects of volcanic ash deposition on peatland development and carbon dynamics. Here we used multi-proxy records from multiple cores at a high-elevation (1570 m a.s.l.) peatland complex on the southern slope of the Changbai Mountain—only 13 km from the crater lake Tianchi—to understand the peatland initiation and carbon accumulation processes under the influence of volcanic eruption. We quantified volcanic glass shards abundance in the peat core under a microscope to show the 5-cm-thick major Millennium Eruption (ME) in 946 CE, along with multiple cryptotephra layers identifiable above a constant background of low abundant shards. Plant macrofossil data show that the major ME volcanic ash deposition caused a large decrease in plant taxon richness, while three out of eight cryptotephra layers induced a brief increase in <em>Sphagnum</em> abundance after each ash deposition but had little impact on plant taxon richness. The divergence in response of species composition to different magnitudes of volcanic ash depositions indicates both beneficial and detrimental effects, perhaps depending on the degree of modifying the nutrient or hydrological status of the peatland. Our results also show that the 5-cm thick ME volcanic ash layer acted as an impermeable layer, increasing surface moisture conditions and promoting the formation of new peatlands on the landscape. Moreover, the ME ash deposition caused a significant decrease in the carbon accumulation rate that lasted for &gt;200 years. Our study indicates that volcanic ash depositions have very different impacts on peatlands by promoting new peatland initiation but impeding carbon accumulation of existing peatlands, implying that the balance of these processes would determine the carbon sink capacity of peatlands in a region as a whole.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108987"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Brine exploitation at Cacica (Romania): An application of radial model of salt supplying","authors":"Marius Alexianu ,&nbsp;Andrei Asăndulesei ,&nbsp;Felix-Adrian Tencariu ,&nbsp;Mihaela Asăndulesei ,&nbsp;Roxana-Gabriela Curcă","doi":"10.1016/j.quascirev.2024.108974","DOIUrl":"10.1016/j.quascirev.2024.108974","url":null,"abstract":"<div><div>Drawing on ethnoarchaeological field research conducted in Romania's Outer Carpathian region between 2007 and 2015, an ethnographic radial model for the supply of brine, recrystallized salt, and rock salt was developed. This paper aims to apply this model to prehistoric contexts, specifically the Neolithic, Chalcolithic, and Bronze Age periods, in relation to the brine sources at Cacica. The selection of this area is grounded in several factors: the presence of multiple brine sources, the use of the <em>briquetage</em> technique (a method for producing salt cakes in ceramic containers) during a specific phase of the Chalcolithic, extensive documentation from ethnographic and ethnohistorical studies, and a rich database on prehistoric settlement patterns.</div><div>At Cacica, two distinct methods of brine exploitation were identified: the production of salt cakes and the direct use of brine without human intervention, primarily for human and animal consumption. The authors utilized the Radial Model of Salt Supply to analyse these two methods of exploitation and suggest that this dual model could offer valuable insights into the understanding of inland <em>briquetage</em> sites across worldwide.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"344 ","pages":"Article 108974"},"PeriodicalIF":3.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142418826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}