Quaternary Science Reviews最新文献

{"title":"Early Pleistocene invasion of Pontocaspian Fauna into the Denizli Basin (SW Anatolia): New stratigraphic constraints and implications for Aegean–Pontocaspian hydrological exchange","authors":"Sergei Lazarev ,&nbsp;Mehmet Cihat Alçiçek ,&nbsp;Lea Rausch ,&nbsp;Marius Stoica ,&nbsp;Klaudia Kuiper ,&nbsp;Thomas A. Neubauer ,&nbsp;Hemmo A. Abels ,&nbsp;Thomas M. Hoyle ,&nbsp;Christiaan G.C. van Baak ,&nbsp;Anneleen Foubert ,&nbsp;Diksha Bista ,&nbsp;Francesca Sangiorgi ,&nbsp;Frank P. Wesselingh ,&nbsp;Wout Krijgsman","doi":"10.1016/j.quascirev.2024.109050","DOIUrl":"10.1016/j.quascirev.2024.109050","url":null,"abstract":"<div><div>Aquatic biodiversity hotspots often emerge in regions with active tectonism, diverse climate conditions and complex basin configurations enabling episodic biotic isolation and exchange. The Anatolian microcontinent, located between the Mediterranean and Pontocaspian regions, has been considered a cradle of biodiversity for continental aquatic organisms. The Denizli Basin succession of SW Anatolia contains a “<em>Didacna</em>” mollusc fauna that could be the precursor of the modern Pontocaspian mollusc faunas of the Black Sea-Caspian Sea regions. However, the appearance of Pontocaspian faunas in the Denizli Basin and constraints upon their ages and dispersal pathways remain enigmatic. Moreover, the emergence of the Pontocaspian biota far into the Anatolian continental interior raises questions regarding the connectivity history and tectonic evolution of the Anatolian, Aegean and Pontocaspian realms. Here, we present an integrated stratigraphy of the ∼1 km thick succession of the Kolankaya Formation of the Denizli Basin, previously assigned to the Late Miocene. To date the first occurrence of Pontocaspian fauna in the Denizli Basin and to characterise accompanying palaeoenvironmental/palaeohydrological changes, we focus on three sets of approaches: dating (magnetostratigraphy and ⁴⁰Ar/³⁹Ar), biotic record (molluscs, ostracods and dinoflagellates) and hydrological connectivity (O- and C-isotopes and ⁸⁷Sr/⁸⁶Sr). We date the studied section as Early Pleistocene, spanning a time range of 2.6 Ma to 0.7 Ma. During that time, the Denizli Basin hosted an isolated to partially hydrologically open oligo-to mesohaline lake. The biotic record shows a drastic turnover of mollusc fauna from endemic Aegean-Anatolian and Pannonian/Paratethyan to Pontocaspian affinity at ∼1.8 Ma. The palaeogeographic evolution of the region, along with the geographically limited appearance of the Pontocaspian faunas, suggests a dispersal pathway from the Black Sea Basin via the Aegean Basin. Subsequently, a short incursion into the Denizli Basin may have occurred via a series of graben-type basins: either via the Söke-Milet Basin – Büyük Menderes Graben or via Izmir Bay – Gediz Graben. Our study shows that the Denizli Basin was not a cradle but rather a sink of the Pontocaspian biota during the Early Pleistocene. The new Early Pleistocene age assignment for the Pontocaspian fauna and the Kolankaya Formation in Denizli calls for a major reappraisal of models for the tectonic and stratigraphic evolution of SW Anatolia, including the regional interbasinal connectivity history.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109050"},"PeriodicalIF":3.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660607","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":"Revealing continuity and sustainability through isotope analysis on the A14 project, Cambridgeshire, UK","authors":"M. Wallace ,&nbsp;J. Montgomery ,&nbsp;B. Rogers ,&nbsp;J. Moore ,&nbsp;G. Nowell ,&nbsp;D. Bowsher ,&nbsp;A. Smith","doi":"10.1016/j.quascirev.2024.109059","DOIUrl":"10.1016/j.quascirev.2024.109059","url":null,"abstract":"<div><div>The A14 archaeological project was the largest commercial archaeological programme in the UK - spanning a 25 km stretch of rural Cambridgeshire, which included a pioneering and ambitious multi-isotope programme to examine crop, livestock and human remains. The resulting dataset spans the Bronze Age to medieval period, incorporating settlements spread across multiple landscape blocks. Our focus on the Iron Age, Roman and Anglo-Saxon periods reveals a remarkable continuity in agricultural practices, diet and provenance. This isotopic homogeneity suggests a persistence of local traditions despite macro-economic and socio-political shifts. Subtle variations within this pattern, however, offer unique insights into individuals who deviated from the norm, hinting at the growing influence of external connections and market economies on these past communities. This study underscores the value of integrating multi-isotope analysis in large-scale commercial archaeological projects, and the rich narrative that emerges from collaborative efforts between commercial and academic researchers.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109059"},"PeriodicalIF":3.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660608","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":"Reconstructing the late Quaternary soil erosion and dust deposition dynamics in the southern Loess Plateau: Insights from Lake Luyanghu sedimentary records","authors":"Hongfei Zhao ,&nbsp;Xin Zhou ,&nbsp;Linhai Yang ,&nbsp;Hao Long ,&nbsp;Liangqing Cheng ,&nbsp;Yonghao Yan ,&nbsp;Jie Zhou ,&nbsp;Qianli Sun ,&nbsp;Claudio O. Delang ,&nbsp;Hongming He","doi":"10.1016/j.quascirev.2024.109000","DOIUrl":"10.1016/j.quascirev.2024.109000","url":null,"abstract":"<div><div>Investigating the history of wind-dust deposition and soil erosion is crucial for understanding the relationship between geomorphologic formation, monsoon evolution and the current state of soil erosion on the Loess Plateau. This study utilizes a 50-m sedimentary record from Lake Luyanghu (LYH) in the southern Loess Plateau. We developed a chronological framework using optically stimulated luminescence (OSL) dating and stratigraphic comparisons. By applying end-member modeling of grain size, we identified various sediment sources and quantitatively reconstructed the dust deposition fluxes and soil erosion modulus during the late Quaternary. Additionally, we examined the patterns of sediment source evolution with environmental changes at LYH. Our findings reveal that dust constitutes an average of 32.3% of the lake sediments, with an average deposition rate of 40.2 g/cm²/ka. Notably, after the Last Glacial period, dust deposition became the dominant component of the lake sediment. During the Marine Isotope Stages (MIS) 5b, 5d, 4 and 2, enhanced dry climatic conditions, decreased vegetation cover and composition, leading to significant soil erosion. Based on the results of this research, future studies should aim to reconstruct the watershed's erosion and deposition processes throughout geological periods by integrating aspects of lake evolution, such as water levels and developmental stages.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109000"},"PeriodicalIF":3.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660708","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 East Asian monsoon variability in the Nihewan Basin, northern China, during the Early Pleistocene: A grain size end-member modelling analysis","authors":"Ahmed H. Moghazi ,&nbsp;Hailong Zhao ,&nbsp;Chengjun Zhang ,&nbsp;Hamdi Omar ,&nbsp;Abdelrhim Eltijani ,&nbsp;Steffen Mischke","doi":"10.1016/j.quascirev.2024.109022","DOIUrl":"10.1016/j.quascirev.2024.109022","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The Pleistocene sediments of the Nihewan Basin in northern China preserve a detailed terrestrial sediment archive for reconstructing the palaeoenvironment and palaeoclimate changes during early times of hominin occupation in E Asia, following the earliest locations outside of Africa. In this study, we investigate the composite 86.2-m long NH-T section of Dachangliang which was formed with an astronomically tuned age between ca. 1.66 and 0.78 Ma. Parameterized grain size end-member modelling analysis is applied for the first time in the Nihewan Basin to unravel the characteristics of sediment sources, transportation dynamics, and climatic signals in the region. The grain-size distributions of the NH-T sediment samples are attributed to a mixture of four distinct end members (EMs 1-4). EM 1 represents a global atmospheric fine silt component (mode at 7.9 μm) which probably resulted from high-altitude westerly transport from distal sources. EM 2, a medium silt component (mode at 27.6 μm) was probably transported by the low-level westerly winds during the spring from a relatively proximal source in comparison to EM 1. EM 3, a coarse silt component (mode at 59.9 μm), represents short distance suspended materials that were blown out by N or NW winds of the East Asian winter monsoon (EAWM). EM 4 is a fine sand component (mode at 221.1 μm), probably representing fluvial deposits carried by overland flow. Therefore, the temporal fluctuations in the abundances of EMs 1-3 are used to infer the history of the East Asian summer monsoon (EASM) (EM 1), of dust-storm outbreaks during springtime (EM 2), and of the EAWM (EM 3). The NH-T climate record shows an overall increase in EM 3 peaks, accompanied by a decrease in EM 1 minima from ca. 1.45 to 0.82 Ma, indicating a long-term aridification and cooling trend in the Nihewan Basin. At ca. 1.25 Ma, the EM patterns transition from short-frequency to longer fluctuations, apparently coinciding with the onset of the Mid-Pleistocene transition (MPT). Periods of stronger EASM with more frequently warm and wet conditions probably occurred in the basin between ca. 1.66-1.62, 1.52-1.25 and after 0.82 Ma. Intensified EAWM conditions probably prevailed in the basin during the intervening periods from ca. 1.62-1.52 and the MPT 1.25-0.82 Ma. The inferred warmer and wetter conditions likely supported hominin activities in the Nihewan Basin, in contrast to mostly colder and drier conditions. Nevertheless, the higher number of discovered Palaeolithic sites and recorded lithic artifacts from the first half of the MPT apparently reflects the successful adaptability of hominins to the prevailing cold climate. The relatively consistent patterns observed between the variations of a median grain-size stack of the Chinese Loess Plateau (CLP MD) and EM 3, and of the magnetic susceptibility stack of the CLP (CLP MS) and EM 1, indicate the climatic sensitivity of these EMs in response to the long-term glacial/interglacial oscilla","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109022"},"PeriodicalIF":3.2,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660710","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":"Transitions between Chinese dynasties influenced by spatial-patterned precipitation","authors":"Haowen Fan ,&nbsp;Chaoyong Hu ,&nbsp;Zunyu Hu ,&nbsp;Zherui Lin ,&nbsp;Yuhui Liu ,&nbsp;Lianlian Li ,&nbsp;Rongbei Qin ,&nbsp;Jingyun Zheng ,&nbsp;Xuejia Wang ,&nbsp;Deliang Chen","doi":"10.1016/j.quascirev.2024.109069","DOIUrl":"10.1016/j.quascirev.2024.109069","url":null,"abstract":"<div><div>Past studies have often associated the transitions of Chinese dynasties with nationwide climate change, overlooking significant spatial heterogeneity in precipitation anomalies across China. Historical changes in spatial precipitation patterns in response to Asian monsoon variability and their societal impact have not been fully explored. In this study, we present a new extended annual laminated speleothem record from central China covering the last 2000 years. By integrating paleoclimatic data from northern and southern China, we reconstructed the history of spatial precipitation patterns dominated by tripole and dipole patterns over the Common Era. Our analysis revealed that although the relationship between the monsoon and precipitation patterns was non-stationary, the positive phases of both patterns occurred more frequently during periods of monsoon weakening on multidecadal to multicentennial timescales. Moreover, the phase and intensity of these precipitation patterns varied across different intervals during the Chinese dynasties. Notably, transitions of unified dynasties often coincide with the simultaneous occurrence of the positive phases of both patterns on multidecadal timescales. This phase configuration of the patterns aligns with prolonged droughts in Eastern China, coinciding with historical records of reduced grain harvests and economic decline. Our findings highlight that historical changes in spatial configuration, rather than the nationwide synchronicity of precipitation anomalies, play a crucial role in Chinese dynastic transitions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109069"},"PeriodicalIF":3.2,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660705","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":"Interhemispheric synchrony of Mid-Late Holocene SST in the Indo-Pacific warm pool linked to upper water column dynamics","authors":"Xuefei Chen ,&nbsp;Wenfeng Deng ,&nbsp;Jian-xin Zhao ,&nbsp;Gangjian Wei","doi":"10.1016/j.quascirev.2024.109064","DOIUrl":"10.1016/j.quascirev.2024.109064","url":null,"abstract":"<div><div>The sea surface temperature (SST) of the Indo-Pacific warm pool (IPWP) plays a crucial role in global climate system. Despite its importance, knowledge of its SST changes over century to millennial timescales remains limited and controversial, hindering our comprehensive understanding of climate change mechanisms. Our study bridges this gap with a novel SST reconstruction spanning approximately 7000 years, derived by aggregating 75 coral Sr/Ca-SST records from the South China Sea. These records reveal a notable synchronization in SST variations with foraminiferal reconstructions across the IPWP, reflecting a prevalent pattern of interhemispheric cooling and multi-century variability in the IPWP during the Mid-Late Holocene. Further analysis reveals that these (sub)millennial SST variations are closely linked to subsurface water temperature and ocean heat content (OHC) changes, supporting the theory that the release of deeper OHC acted as a heat source for low-latitude processes during the Holocene.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109064"},"PeriodicalIF":3.2,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660706","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":"Chronology of late Holocene relative sea-level change in Boston Harbor","authors":"Andrew C. Kemp,&nbsp;Elaine M. Whetstine,&nbsp;John C. Ridge","doi":"10.1016/j.quascirev.2024.109053","DOIUrl":"10.1016/j.quascirev.2024.109053","url":null,"abstract":"<div><div>We use a core of salt-marsh sediment from Boston Harbor (Massachusetts, USA) to evaluate the sensitivity of late Holocene relative sea-level (RSL) reconstructions to the pre-treatment, graphitization, and upcore distribution of radiocarbon dates. The 87 radiocarbon dates from 58 unique depths in the 4.2-m long core show that ages from plant macrofossils (principally rhizomes and stems of <em>Spartina patens</em> and <em>Distichlis spicata</em>) are insensitive to pre-treatment and graphitization regimes. Statistical resampling from the pool of radiocarbon dates generated many plausible chronologies and demonstrates that the precision of age-depth models increases as dates are added, but with diminishing returns. Estimated sample ages are not systematically biased by the density of dates. Identification of periods with slower sedimentation requires a higher density of dates than identifying periods with faster sedimentation. These results suggest that RSL variability reconstructed among sites and regions is unlikely to be the result of choices in the preparation and selection of samples from salt-marsh sediment for radiocarbon dating. We reconstructed paleomarsh elevation using a Bayesian transfer function trained on the observed relationship between salt-marsh foraminifera and tidal elevation in 212 surface-sediment samples. This model utilized informative prior information from bulk-sediment δ¹³C values. During the past ∼4200 years RSL rose by ∼4.2 m in Boston Harbor at a rate of ∼0.9 mm/yr until the early 20th century when the rate increased to ∼3 mm/yr, which is consistent with estimates of glacio-isostatic adjustment and historic tide-gauge measurements in Boston Harbor.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"346 ","pages":"Article 109053"},"PeriodicalIF":3.2,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660707","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 South Caucasus from the Upper Palaeolithic to the Neolithic: Intersection of the genetic and archaeological data","authors":"Christine Chataigner","doi":"10.1016/j.quascirev.2024.109061","DOIUrl":"10.1016/j.quascirev.2024.109061","url":null,"abstract":"<div><div>The genomic characterisation of human remains and the study of archaeological assemblages are complementary keys to understanding the evolution of ancient human groups. This article proposes a dialogue between these two approaches for the South Caucasus between the Upper Palaeolithic and the Neolithic periods.</div><div>In the Upper Palaeolithic before the Last Glacial Maximum (ca. 40.-23. ka cal BP), genetic and archaeological data demonstrate the originality of the populations of the South Caucasus (<em>Caucasus_UP</em> genome) compared with their neighbours in SE Europe and SW Asia and also show the existence of links between these different regions. For the post-LGM phase (ca. 20.9–11.7 ka cal BP), archaeological data suggest a certain continuity with the previous period during the cold phase of the Oldest Dryas, followed by a marked rapprochement with the Zarzian culture in the Zagros starting with the warming of the Bølling-Allerød. Genetic analyses, which are available only for the latter phase, reveal a new genome (<em>Caucasus Hunter-Gatherer</em> or <em>CHG</em>), that is very close to that of the ancestors of the Neolithic populations of the Zagros.</div><div>For the Early Holocene (ca. 11.7–8.2 ka cal BP or 9700-6200 cal BCE), the <em>CHG</em> genome, which still characterises the populations of the South Caucasus, is difficult to distinguish in modelling from that of the Zagros <em>(Iran_N</em>). However, archaeological data suggest that the spread of the <em>Iran_N/CHG</em> gene pool from Iran to Upper Mesopotamia and Central Anatolia was due to populations from the northwest Zagros, and not to those from the South Caucasus, who had only occasional contacts with the Fertile Crescent.</div><div>At the beginning of the Middle Holocene (ca. 8.2–7.2 ka cal BP or 6200-5200 cal BCE), the appearance in the South Caucasus of animals and plants presenting a high level of domestication, as well as the introduction of new techniques (pressure knapping with a lever, pottery), are clearly due to the arrival of populations from the Fertile Crescent, as confirmed by genetic analyses. These analyses also show that there was not a replacement of local Mesolithic communities by Neolithic farmers, which the archaeological evidence confirms.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 109061"},"PeriodicalIF":3.2,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657512","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":"Quaternary and Pliocene sea-level changes at Camarones, central Patagonia, Argentina","authors":"Karla Rubio-Sandoval ,&nbsp;Deirdre D. Ryan ,&nbsp;Sebastian Richiano ,&nbsp;Luciana M. Giachetti ,&nbsp;Andrew Hollyday ,&nbsp;Jordon Bright ,&nbsp;Evan J. Gowan ,&nbsp;Marta Pappalardo ,&nbsp;Jacqueline Austermann ,&nbsp;Darrell S. Kaufman ,&nbsp;Alessio Rovere","doi":"10.1016/j.quascirev.2024.108999","DOIUrl":"10.1016/j.quascirev.2024.108999","url":null,"abstract":"<div><div>Geological indicators of past relative sea level changes are fundamental to reconstruct the extent of former ice sheet during past interglacials, which are considered analogs for future climate conditions. Four interglacials, dating from Holocene to Pliocene, have left sea-level imprints in the proximity of the coastal town of Camarones in Central Patagonia, Argentina. Sea-level index points were preserved as beach ridges deposited by storm waves above modern sea level. We used highly accurate survey techniques to measure the elevation of these deposits. Satellite derived wave measurements and wave runup models were then employed to calculate their indicative meaning (i.e., their elevation with respect to sea level at the time of deposition). The paleo relative sea levels (i.e., uncorrected for post-depositional vertical land motions) associated with the four interglacials (with ±1σ uncertainties) are 6 ± 1.5 m (late Holocene); 8.7 ± 2.1 m (MIS 5e); 14.5 ± 1.5 m (MIS 9 or 11); and 36.2 ± 2.7 m (Early Pliocene). Ages have been obtained using both published (U-series, Electron Spin Resonance, and Radiocarbon) and new (Amino Acid Racemization and Radiocarbon) dating constraints. We compare our results with published glacial isostatic adjustment and mantle dynamic topography predictions, and we highlight that refining these models before calculating the global mean sea level for the interglacials mentioned above is necessary. Our high-resolution sea-level index points serve as an important contribution to the record of paleo relative sea-level in the Southwestern Atlantic.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 108999"},"PeriodicalIF":3.2,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657511","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":"The role of ocean circulation and regolith removal in triggering the Mid-Pleistocene Transition: Insights from authigenic Nd isotopes","authors":"Thomas J. Williams ,&nbsp;Alexander M. Piotrowski ,&nbsp;Jacob N.W. Howe ,&nbsp;Claus-Dieter Hillenbrand ,&nbsp;Claire S. Allen ,&nbsp;Josephine A. Clegg","doi":"10.1016/j.quascirev.2024.109055","DOIUrl":"10.1016/j.quascirev.2024.109055","url":null,"abstract":"<div><div>Approximately 1,250,000 to 700,000 years ago, the pacing of glacial-interglacial cycles changed from 41,000 years to ∼100,000 years, a shift known as the ‘Mid-Pleistocene Transition’ (MPT). The cause – or causes – of this shift remain uncertain. However, changes in ocean circulation and removal of northern hemisphere regolith have both been proposed as potential triggers. Here, we present continuous, orbitally resolved reconstructions of deep ocean neodymium isotopes from three locations in the equatorial Atlantic, Indian and southwest Pacific oceans, spanning 1.7 million years from the Holocene to before the MPT, to test these two hypotheses. We find that global seawater neodymium isotope variability over glacial-interglacial cycles is controlled by changes in both neodymium input to the North Atlantic and deep ocean mixing. Using this neodymium isotope data, we show that enhanced northern hemisphere regolith removal began approximately 1.45 million years ago, ∼200,000 years prior to the onset of the MPT and ∼500,000 years prior to a major expansion in northern hemisphere ice sheets between ∼900,000 and 870,000 years ago. This ice sheet expansion was immediately preceded by an interval of reduced mixing of Atlantic-sourced waters into the deep southwest Pacific Ocean. We hypothesize that this circulation reorganization reflected increased stratification of the deep Southern Ocean interior, possibly in response to cooling and Antarctic sea ice expansion at this time. Taken together, these data suggest an expansion and/or thickening of northern hemisphere ice sheets during the MPT was facilitated by a combination of reduced northern hemisphere regolith cover alongside Southern Ocean circulation changes. Together, these shifts allowed the build up of larger northern hemisphere ice sheets that were more resistant to deglaciation, facilitating the longer glacial cycles of the post-MPT world.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"345 ","pages":"Article 109055"},"PeriodicalIF":3.2,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593062","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}