Quaternary Science Reviews最新文献

{"title":"Isotopic composition and growth rate of microbialites in Laguna Turquesa, a high-altitude lake in the Central Andes","authors":"M. Della Vedova ,&nbsp;G.E. Alonso ,&nbsp;P.G. Villafañe ,&nbsp;L.R. Horta ,&nbsp;L.F. Cury","doi":"10.1016/j.quascirev.2025.109386","DOIUrl":"10.1016/j.quascirev.2025.109386","url":null,"abstract":"<div><div>This study investigates the isotopic characterization of microbialites from Turquesa Lake located in the arid, high-altitude region of the Central Andes (3752 m.a.s.l.). Stable isotope analyses (δ¹³C and δ¹⁸O) were conducted on three microbialite levels (M1, M2, and M3), with complementary radiocarbon dating revealing ages of 11,830 ± 170 years BP for the outer layer of M1 and 13,140 ± 120 years BP for its core. Findings indicate variable microbial growth rates, peaking in the core (0.12 mm/year) and decreasing towards the outer layers (0.027 mm/year), with internal structures reflecting reticulate intervals in central zones and laminated patterns in outer layers. δ¹³C values ranged from 11.86 to 9.93 ‰ and δ¹⁸O from 10.60 to 6.22 ‰. The results suggest that M1 and M2 formed when Turquesa and Peinado lakes were connected, displaying complex isotopic fractionation influenced by evaporation and photosynthesis, while M3 formed under evaporative conditions associated with the separation of the lakes due to evaporation. Nevertheless, M3 appears to be less evaporative than M1 and M2, as indicated by its lower δ¹⁸O values. This research provides new insights into how extreme environmental conditions in the Puna have influenced the isotopic evolution and formation of microbialites.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"361 ","pages":"Article 109386"},"PeriodicalIF":3.2,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937250","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":"Unravelling the formation processes and depositional histories of the Middle Palaeolithic Ararat-1 Cave, Armenia: A multiscalar and multiproxy geoarchaeological approach","authors":"Ioannis A.K. Oikonomou ,&nbsp;Theodoros Karampaglidis ,&nbsp;Kaja Fenn ,&nbsp;Shira Gur-Arieh ,&nbsp;David Nora ,&nbsp;Laura Sánchez-Romero ,&nbsp;Dominik L. Rogall ,&nbsp;Delphine Vettese ,&nbsp;Boris Gasparyan ,&nbsp;Artur Petrosyan ,&nbsp;Ariel Malinsky-Buller","doi":"10.1016/j.quascirev.2025.109405","DOIUrl":"10.1016/j.quascirev.2025.109405","url":null,"abstract":"<div><div>The sedimentary sequence of Ararat-1 Cave encapsulates an intricate depositional archive (Marine Isotope Stage 3), crucial for our understanding of the Middle Palaeolithic in the Armenian Highlands and beyond. The study of this record is accomplished through the use of a multi-proxy geoarchaeological framework of analysis, incorporating stratigraphical, micromorphological, sedimentological, mineralogical, chemical, magnetic, micro-archaeological and geochronological methods. These analyses demonstrate the predominance of geogenic processes, including rockfalls, grain and debris flows, interbedded with aeolian sedimentation, as well as localised pyroclastic material in-wash events. Post-depositional alterations are primarily linked to intense bioturbation, as well as minimal karst-induced cementation and minor phosphate diagenesis. The study of the anthropogenic and biogenic records indicates dynamic human-animal habitation histories. Human visits, associated with combustion and consumption activities, were infrequent and short-lived, representing brief occupation episodes in a cave habitually visited by carnivores and herbivores. This high-resolution reconstruction of Ararat-1 Cave formation histories improves our understanding of regional settlement and mobility patterns, highlighting the presence of Middle Palaeolithic groups that temporarily camped in the Ararat Depression.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"361 ","pages":"Article 109405"},"PeriodicalIF":3.2,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143941998","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":"Heliomagnetic and geomagnetic activity cycles on millennial timescales","authors":"Juerg Beer ,&nbsp;Ken G. McCracken ,&nbsp;Florian Adolphi ,&nbsp;Marcus Christl ,&nbsp;Hubertus Fischer ,&nbsp;Heinrich Miller ,&nbsp;Raimund Muscheler ,&nbsp;Hans A. Synal ,&nbsp;Frank Wilhelms","doi":"10.1016/j.quascirev.2025.109364","DOIUrl":"10.1016/j.quascirev.2025.109364","url":null,"abstract":"<div><div>We report 17 new solar activity cycles with periodicities ranging from 1,700 to 18,000 years. Using Bayesian spectral analysis we determined for each cycle period, amplitude and phase for the past 145,000 years. These results were obtained by analyzing ¹⁰Be in the 2775 m long EDML ice core from Dronning Maud Land, Antarctica. In addition, we have augmented the ¹⁰Be data with synchronous ice accumulation and δ¹⁸O data obtained from the same ice core; with paleomagnetic dipole moment data derived mainly from ocean sediments; and with calculated global insolation data. There is a close agreement between the ¹⁰Be periodicities in the first and the last 70 kyr intervals. We have developed a new analytical technique we call the “frequency domain differentiation technique” (FDDT) that distinguishes between the periodicities due to (a) variations in the cosmic ray intensity and (b) climate effects related to the accumulation rate. In a first step we have calculated the ¹⁰Be flux and then selected all periodicities which are common within 1 % in at least 2 of the investigated parameters (¹⁰Be concentration, ¹⁰Be flux, accumulation rate, δ¹⁸O, and insolation). Using these data we identified a total of 42 statistically significant periodicities. 20 of them are found in the ¹⁰Be concentration which we separated into 3 groups of origins: Four due to ¹⁰Be production only (group 1: 18012, 6508, 5782, 3833 yr), thirteen being a combination of production and accumulation related (system) effects with the production components being generally larger than the system components (group 2: 15503, 13837, 8441, 7722, 7136, 4695, 4556, 4110, 3961, 3292, 3104, 2025, 1680 y), and three being related to system effects only (group 3: 23971, 21101, 11637 y). In a second step we used independent paleomagnetic information to distinguish between heliomagnetic and geomagnetic periodicities in the ¹⁰Be production. We find an overall good agreement between the ¹⁰Be flux and the dipole moment in the time domain. In the frequency domain there is evidence for system effects in the geomagnetic data. Due to inconsistencies between the paleomagnetic records we do not draw conclusions regarding a potential geomagnetic origin of the ¹⁰Be cycles found in the EDML ice core.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"361 ","pages":"Article 109364"},"PeriodicalIF":3.2,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927732","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":"Neolithic land use and forest dynamics on the Swiss Plateau (southwestern Central Europe)","authors":"Fabian Rey ,&nbsp;Oliver Heiri ,&nbsp;Lucia Wick ,&nbsp;Erika Gobet ,&nbsp;Sönke Szidat ,&nbsp;Urs Leuzinger ,&nbsp;Renate Ebersbach ,&nbsp;Albert Hafner ,&nbsp;Willy Tinner","doi":"10.1016/j.quascirev.2025.109372","DOIUrl":"10.1016/j.quascirev.2025.109372","url":null,"abstract":"<div><div>The successional patterns and vegetational processes associated with the Neolithization period remain poorly understood, particularly at high temporal resolution. To address this knowledge gap, decadal-scale, well-dated palaeoecological studies are essential to illuminate this prehistoric tipping point, when economy shifted from collection to production and pristine landscapes were increasingly shaped by human activity.</div><div>We analyzed lake sediments from four small lowland lakes on the Swiss Plateau (southwestern Central Europe): Moossee (521 m a.s.l.), Burgäschisee (465 m a.s.l.), Lützelsee (500 m a.s.l.), and Hüttwilersee (435 m a.s.l.). Two of these lakes (Moossee and Burgäschisee) contain annually laminated (varved) sediments, enabling a precise chronological framework. High-resolution palaeoecological analyses, including pollen and microscopic charcoal, were supported by extensive radiocarbon dating. This approach allowed us to investigate the timing and spatial extent of land use phases and plant successional patterns, revealing complex interactions between human activities and climate at an unprecedented temporal resolution.</div><div>For millennia, mixed forests dominated by <em>Fagus sylvatica</em> characterized the southwestern Central European lowland vegetation. Our findings indicate that between 6500 and 4200 cal yr BP (4550‒2250 cal yr BCE), three major synchronous forest disruptions occurred. These disruptions coincided with increased fire and agricultural activities around 6400‒6000 cal yr BP (4450‒4050 cal yr BCE), 5800‒5600 cal yr BP (3850‒3650 cal yr BCE), and 5100‒4850 cal yr BP (3150‒2900 cal yr BCE). Land use phases created open areas, typically enhancing plant diversity, and often aligned with the presence of local lake shore settlements. Each phase lasted several decades to centuries. Subsequently, arboreal vegetation recovered, with early successional species such as <em>Corylus avellana</em> and <em>Betula</em> giving way within 100–150 years to late successional mixed beech forests. <em>Abies alba</em> was co-dominant near the Jura and Napf Mountains (Moossee, Burgäschisee) and close to the pre-Alps (Lützelsee) but remained rare in the Lake Constance region (Hüttwilersee).</div><div>The palaeoclimatic context suggests that early agrarian societies were highly sensitive to climatic fluctuations. Climate-driven expansions or contractions in agricultural activities, mainly caused by production success or failure, respectively, likely contributed to large-scale, spatially synchronous successional patterns during this transformative period.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109372"},"PeriodicalIF":3.2,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928341","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":"Holocene trends in Nile Delta fire regimes driven by cropland expansion and reduced precipitation","authors":"Xiaoshuang Zhao ,&nbsp;David Kaniewski ,&nbsp;Yanna Wang ,&nbsp;Nick Marriner ,&nbsp;Alaa Salem ,&nbsp;Yan Liu ,&nbsp;Jing Chen ,&nbsp;Qianli Sun ,&nbsp;Brian Finlayson ,&nbsp;Thierry Otto ,&nbsp;Frédéric Luce ,&nbsp;Zhongyuan Chen","doi":"10.1016/j.quascirev.2025.109412","DOIUrl":"10.1016/j.quascirev.2025.109412","url":null,"abstract":"<div><div>Fire played a pivotal role in promoting early agricultural development in ancient Egyptian societies. In the Nile Delta, since the Predynastic period, fires have predominantly been initiated by human activity. However, the long-term alterations in precipitation patterns and Nile floods might also have significantly influenced the evolution of the human-induced fire regime. Here we investigate 8000 years (10,000 to 2000 BP) of fire activity in the Nile Delta using a composite sequence based on cores taken from the Predynastic sites of Buto, Sais and Kom El-Khilgan. We compared and contrasted the long-term evolution of fire activity with precipitation data, Nile flow dynamics and the emergence/development of agriculture to disentangle the factors that modulated the occurrence and intensification of fires during the Holocene. Until 6100 ± 70 BP, sustained precipitation, in tandem with significant flooding of the Nile, was the foremost factor inhibiting human settlement and the use of fire in the delta. During the period spanning from 6100 ± 70 to 4700 ± 70 BP, weakening Nile discharge and increasing human-induced fire significantly promoted agriculture. Since 4700 ± 70 BP, cropland expansion, driven by declining intensity in Nile flow and reduced precipitation, has contributed substantially to the upward trend in fire activity over the delta. This increase in burned areas likely resulted from the need for sustained agricultural production to cope with rapid population growth in Egypt and the socio-economic changes that occurred during the Dynastic period. The Nile Delta data are consistent with those of the eastern Mediterranean, suggesting that the entire region underwent significant transformation between 5500 and 4500 BP.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"361 ","pages":"Article 109412"},"PeriodicalIF":3.2,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143927733","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":"Environmental variability of the last 1600 years derived from a multiproxy lake record of the east Andean margin (46.7°S), central west Patagonia, Chile","authors":"Carolina Franco ,&nbsp;Antonio Maldonado ,&nbsp;Christian Ohlendorf ,&nbsp;A. Catalina Gebhardt ,&nbsp;M. Eugenia de Porras ,&nbsp;Amalia Nuevo-Delaunay ,&nbsp;César Méndez ,&nbsp;Christoph Vogt ,&nbsp;Bernd Zolitschka","doi":"10.1016/j.quascirev.2025.109392","DOIUrl":"10.1016/j.quascirev.2025.109392","url":null,"abstract":"<div><div>Central west Patagonia is directly exposed to influence of the Southern Westerly Winds (SWW). Its position relative to the core of this major wind system makes this region highly susceptible to magnitude and latitudinal changes of the SWW. Moreover, the pronounced topography defines a strong west-east moisture gradient. We present an environmental reconstruction derived from sediments of Laguna Vogt, a lake located in one of the easternmost valleys of central west Patagonia.</div><div>Our reconstruction shows that increased runoff triggered the remobilization of basaltic material, while lacustrine production remained low between 1600-1300 and 1000-750 cal yr BP. Between 1300-1000 and 750-250 cal yr BP, these conditions changed to decreased surface runoff, with less clastic input favoring high autochthonous sedimentation, while several episodes of flooding occurred.</div><div>Our findings indicate that intervals of enhanced runoff at Laguna Vogt correlate with a regional period of increased precipitation, which started to decline around 800 cal yr BP. Climate reconstructions suggest that increased precipitation was a direct result of intensified SWW. Thus, periods of high lacustrine productivity interspersed with episodes of intense flooding are interpreted as shifts between wet-cold and dry-warm conditions occurring on decadal to multidecadal timescales.</div><div>Around 250 cal yr BP, fluvial detrital input into the lake became dominant, suggesting the establishment of wetter conditions. This increase in precipitation, also documented by other sediment records from central west Patagonia, is associated with intensified SWW. Such a timing compares well with multiple regional glacial advances, indicating an environmental shift likely associated to the last glacial stage of the Holocene.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109392"},"PeriodicalIF":3.2,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928342","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":"Paleohydrological changes in the eastern Baltic Sea during the Middle/Late Pleistocene transition and the Last Interglacial","authors":"Maksim V. Ruchkin ,&nbsp;Mikhail V. Sheetov ,&nbsp;Ekaterina E. Taldenkova ,&nbsp;Zinaida V. Pushina ,&nbsp;Varvara I. Dudanova ,&nbsp;Yaroslav S. Ovsepyan ,&nbsp;Evgeny A. Konstantinov ,&nbsp;Ekaterina S. Nosevich ,&nbsp;Mark A. Mustafin","doi":"10.1016/j.quascirev.2025.109244","DOIUrl":"10.1016/j.quascirev.2025.109244","url":null,"abstract":"<div><div>The Mga Sea existed from the latest Middle Pleistocene to the latest Last Interglacial (LIG) within the Gulf of Finland, Lake Ladoga, Lake Onega basins and the connecting straits. Paleohydrological changes in the Mga Sea evolution are traced with a multiproxy approach using X-ray fluorescence, carbon and nitrogen (CN), grain size, X-ray diffraction (XRD) analyses, along with microfossil data (diatoms and benthic foraminifers) for Mikulino (Eemian) and Upper Moscow (Upper Saalian) marine sediments in the Sverdlov Factory section of the Neva Lowland (St. Petersburg region, Russia). In addition, varve chronology is applied to the Upper Moscow glaciomarine/glaciolacustrine deposits as time constraints on paleogeographic changes in the Mga basin during the Middle/Late Pleistocene transition. The results indicate that saline waters entered the glacial lake in the periphery of the Scandinavian Ice Sheet at least 1100 years before the onset of the Mikulino Interglacial. During the period between ∼1050 and 550 years before the LIG, the basin was freshened and became again connected with the ocean afterwards. In the early LIG, the Mga Sea experienced brackish conditions with predominantly oxygenated near-bottom waters indicated by an impoverished benthic foraminiferal assemblage with <em>Elphidium clavatum</em> as dominant species, as well as by geochemical and lithological proxies. Diatom and geochemical data reveal a steep rise in water salinity and depth in the middle of the <em>Quercus</em> regional pollen assemblage zone (RPAZ M₄). The highstand phase lasted until regression began in the <em>Carpinus-Picea</em> zone (RPAZ M_6-7). The increase in water salinity and depth led to the spread of marine molluscs at the base of RPAZ M₅, though limited to a few species due to the onset of hypoxia in near-bottom waters. Fully anoxic conditions were established at the end of RPAZ M₅ and persisted till the end of the Mikulino Interglacial, with a brief oxygenation excursion in the first half of the <em>Pinus</em> zone (RPAZ M₈). At the end of RPAZ M₈ or at the beginning of the Early Valdai (Early Weichselian), the Mga basin became freshwater. The Mga Sea shared much similarity with the Late Glacial/Holocene Baltic Sea in evolution patterns.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109244"},"PeriodicalIF":3.2,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921881","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":"The last interglacial transgression in Italy: the breath of the Italian coasts documented by 461 sites","authors":"F. Antonioli ,&nbsp;L. Ferranti ,&nbsp;M. Agate ,&nbsp;A. Ascione ,&nbsp;C. Cerrone ,&nbsp;V. De Santis ,&nbsp;G. Deiana ,&nbsp;A. Fontana ,&nbsp;S. Furlani ,&nbsp;G. Leoni ,&nbsp;V. Lo Presti ,&nbsp;L. Guerrieri ,&nbsp;G. Mastronuzzi ,&nbsp;C. Monaco ,&nbsp;P. Orru ,&nbsp;P. Pieruccini ,&nbsp;A. Sulli","doi":"10.1016/j.quascirev.2025.109376","DOIUrl":"10.1016/j.quascirev.2025.109376","url":null,"abstract":"<div><div>In 2023, the Italian community of Quaternary scientists produced, under the umbrella of METIQ (Modello Evolutivo del Territorio Italiano nel Quaternario (Evolutive Model of the Italian Territory during the Quaternary) coordinated by the Geological Survey of Italy (ISPRA), a Quaternary Map of Italy at 1:500.000 scale that included a database of the last interglacial (LIG) marine highstand's markers along the Italian coasts. The LIG geodatabase lists several well-preserved outcrops and cores, rich in marine fossil features and deposits, straddling the whole Italian coastal areas. This geodatabase relies on three already existing databases, integrated with data from recently published works. In addition, for each site, a re-evaluation of the main chronological and geomorphological data (elevation, age, measurement error, relationship with original sea level and isostatic adjustment correction, GIA) has been made. Coastal areas with the most important LIG inner margins are highlighted. Finally, the long term geological vertical displacement rate is calculated for each site according to the requirements of the METIQ database.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109376"},"PeriodicalIF":3.2,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921880","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":"Changes in the deep-water masses of the Eastern Mediterranean Sea during the last interglacial maximum - New constraints from neodymium isotopes in foraminifera","authors":"Guohui Gao ,&nbsp;Christophe Colin ,&nbsp;Giuseppe Siani ,&nbsp;Sophie Sepulcre ,&nbsp;Zhifei Liu ,&nbsp;Jiawang Wu ,&nbsp;Arnaud Dapoigny ,&nbsp;Elisabeth Michel ,&nbsp;Rosella Pinna ,&nbsp;Amélie Plautre ,&nbsp;Nejib Kallel ,&nbsp;Paolo Montagna","doi":"10.1016/j.quascirev.2025.109391","DOIUrl":"10.1016/j.quascirev.2025.109391","url":null,"abstract":"<div><div>The thermohaline circulation of the Mediterranean Sea was a key factor in the development of sapropel layers in the Eastern Mediterranean Sea (EMS). Sapropel formation is linked to stagnant deep-water conditions and/or increased sea surface productivity during boreal summer insolation maximum. However, debates persist regarding the complex interplay between high and low latitude climatic processes, circulation dynamics, and sapropel formation. Analyses of major and trace elements by XRF, δ¹⁸O of planktonic foraminifera, and neodymium isotopes (εNd) of foraminifera have been carried out on two cores collected in the southeastern Aegean Sea of the EMS and in the Sardinia Channel of the Western Mediterranean Sea (WMS), in order to constrain deep-water mass circulation during the last glacial-interglacial cycle (i.e. the past ∼150 ka), focusing on the last interglacial maximum. When combined with previous εNd records from the EMS, we identified two regional patterns of the εNd variations during the sapropel S5 interval (∼128-120 ka), suggesting that the initial freshwater influx from North Africa led to marked water stratification, limited deep-water formation, and shifted foraminiferal εNd towards a local signature due to an extended period of Nd exchange between seawater and marginal sediments. Cores strongly influenced from the Nile River discharge display radiogenic εNd values (−3.7), whereas those from the northern EMS exhibit more unradiogenic εNd values (−5.1). As S5 progressed, εNd records of all cores from the Levantine basin indicate a slight mixing of deep-water masses accompanied by a decrease in the εNd gradient between the northern and southern EMS. This was associated with the global decrease in temperature and reduced Nile River water input, which supported a slight deep-water recirculation from the Aegean Sea. This active circulation conveyed radiogenic εNd from the southern EMS to the north and the Western Mediterranean Sea. Overall, our new results suggest that hydrological conditions in Mediterranean Sea fluctuated during the S5 deposition, with a slight recirculation of Aegean deep-water in a pre-stage before the complete recovery of circulation in the EMS at the end of the sapropel S5 deposition.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109391"},"PeriodicalIF":3.2,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917807","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":"Palaeoceanographic evolution of the Gulf of Corinth (Greece) during Quaternary glacial-interglacial cycles","authors":"Eugenia Fatourou ,&nbsp;Aikaterini Kafetzidou ,&nbsp;Fabienne Marret ,&nbsp;Konstantinos Panagiotopoulos ,&nbsp;Katerina Kouli","doi":"10.1016/j.quascirev.2025.109393","DOIUrl":"10.1016/j.quascirev.2025.109393","url":null,"abstract":"<div><div>The Gulf of Corinth (GoC), derived from a geologically young active rift, offers a unique opportunity to study changes in environmental conditions during the Quaternary period in a region where long sequences are few. Due to periods of isolation during Quaternary lowstands, the water conditions were not favorable for the occurrence of conventional palaeoceanographical proxies such as planktonic foraminifera. We present here the first almost continuous record of phytoplankton proxies (dinoflagellate cysts) and freshwater palynomorphs (green algae) for the past 1.1 Myr aiming to provide a comprehensive insight into palaeoceanographic variability between glacial and interglacials cycles. Core M0078A retrieved during the IODP expedition 381 contains a rich and diverse dinoflagellate cyst assemblage, sorted into two major ecogroups, representing alternations between marine and brackish conditions. Our results allow for the first time the reconstruction of the Gulf environmental history of connection and disconnection from marine conditions from late Pleistocene to Holocene (1.1Ma – present). Dinocysts and other palynomorphs (NPPs) suggest that the GoC was repeatedly isolated and reconnected to the Mediterranean Sea during global sea-level lowstands associated with glacial intervals. These combined proxies suggest that marine water flowed into the GoC during the eustatic highstands associated with interglacial intervals. The dinocyst assemblages show a close affinity to modern assemblages from the Black, Caspian, and Marmara Seas.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"360 ","pages":"Article 109393"},"PeriodicalIF":3.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143917806","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}