Palaeogeography, Palaeoclimatology, Palaeoecology最新文献

{"title":"Burrows of the giant beach worm (Australonuphis) in a high-energy beach environment in New South Wales, Australia: implications for the palaeoecology of some Phanerozoic Skolithos assemblages","authors":"Koji Seike ,&nbsp;Thomas S.N. Oliver","doi":"10.1016/j.palaeo.2026.113555","DOIUrl":"10.1016/j.palaeo.2026.113555","url":null,"abstract":"<div><div>The trace fossil <em>Skolithos</em> is a simple, sub-vertical, unbranched, cylindrical burrow that characterizes the trace fossil from early Cambrian to recent times. The <em>Skolithos</em> ichnofacies is an indicator of high-energy coastal marine facies, such as the sandy beaches of wave-dominated coasts; however, to date, neoichnological studies have only reported its occurrence in low-energy settings, where it is produced by a variety of annelids, phoronids, and priapulids. In this paper, we describe the burrow produced by the Australian giant beach worm (<em>Australonuphis</em>, family Onuphidae) at Bengello Beach, southeastern Australia, where they occur in a high-energy, wave-dominated sandy coastal setting. The burrows of this omnivorous scavenger show a straight or slightly bent vertical shaft without branching or chambers, and may be regarded as a modern analog of the trace fossil <em>Skolithos.</em> The burrows are distributed only below the lower foreshore, and therefore we infer that the uppermost level of <em>Skolithos</em> occurrences in the Phanerozoic fossil record may be a useful indicator of ancient sea-level in the <em>Skolithos</em> ichnofacies. As such, our findings improve knowledge of the palaeoecology of the <em>Skolithos</em> ichnofacies, including feeding ecology, and enhance its palaeoenvironmental utility.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113555"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981304","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 reconstruction of the destroyed city floods of the Daming Prefecture during Ming Dynasty","authors":"Tianyu Du ,&nbsp;Xueyan Ren ,&nbsp;Junxia Yan ,&nbsp;Yuecong Li ,&nbsp;Yuejie Wu ,&nbsp;Mingxia Xie ,&nbsp;Shaoqing Guo ,&nbsp;Wei Lv ,&nbsp;Nan Yang ,&nbsp;Qinghai Xu ,&nbsp;Bing Li ,&nbsp;Huayong Li","doi":"10.1016/j.palaeo.2026.113546","DOIUrl":"10.1016/j.palaeo.2026.113546","url":null,"abstract":"<div><div>Under global warming, extreme climate events are increasing in frequency.</div><div>Floods remain major disasters due to their frequent occurrence and widespread impacts on human societies. Current observational data inadequately constrain rare high-magnitude flood events, so the reconstruction of paleoflood with long time scale is particularly important. Daming Prefecture was once the capital of seven dynasties and served as the “Beijing” of the Northern Song Dynasty (960–1127 CE), with a significant military status, but the city was destroyed by a flood disaster in Ming Dynasty (about 1400 CE), retains ancient flood deposits, which provide valuable material for reconstructing ancient floods. Through the AMS ¹⁴C and archaeological dating, we established an accurate time frame for the paleoflood. Beyond the field lithology, particularly the brown-red clay, we determined the flood layers in the second and fifth layers using indicators like pollen, grain size, and magnetic susceptibility. Notably, the elevated levels of fine silt (46.1 %), organic matter (4.7 %), tree and shrub pollen (30.8 %), <em>Pinus</em> (27.2 %), and fern spores (46.5 %) are key markers for identifying paleoflood events in the area. The extreme paleoflood depth that destroyed the city was estimated at least 2.1–3.3 m based on end-point elevation method. Furthermore, we found that the paleoflood in the region was primarily influenced by weak El Niño conditions and the northward shift of the Intertropical Convergence Zone. This provides a scientific basis for the future construction of water conservancy facilities, flood control measures, and soil erosion prevention in the region.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113546"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941348","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":"A mid-Cretaceous (late Albian–early Turonian) stable isotope record from southern Tibet – Pristine or diagenetically altered?","authors":"Meiling Han ,&nbsp;Gang Li ,&nbsp;Alexander Wheeler ,&nbsp;Ulrich Heimhofer ,&nbsp;Jörg Mutterlose","doi":"10.1016/j.palaeo.2026.113552","DOIUrl":"10.1016/j.palaeo.2026.113552","url":null,"abstract":"<div><div>The late Albian to early Turonian interval was characterized by a pronounced greenhouse climate, marked by major perturbations of the global carbon cycle and the development of several Oceanic Anoxic Events (OAEs). These events are recognized by the widespread deposition of organic-rich black shales, typically associated with distinctive carbon isotope excursions (CIEs). While high-resolution carbon isotope records of the late Albian OAE (OAE 1d, ∼103 to 99.5 Ma) are well-documented in the western Tethys and North Atlantic, detailed studies across this event from the eastern Tethys remain limited. Here, we present new data from the Qiangdong section (Gamba area, southern Tibet), including stable carbon and oxygen isotope curves, mineralogy, Rock-Eval pyrolysis and palynofacies analysis. Our continuous δ¹³C_carb record provides detailed geochemical documentation for the upper Albian to lower Turonian, enabling robust chemostratigraphic correlation with global OAE 1d records. Negative δ¹⁸O_carb values (as low as −11.9‰) and mineralogical evidence (dominated by illite, &gt; 50%) indicate strong diagenetic overprint. Both T_max values (432–560 °C) and highly degraded, dark-colored palynomorphs suggest that the sedimentary sequence of the Qiangdong section has undergone significant thermal alteration, with organic matter reaching mature to overmature stages. This is further supported by the dominance of <em>Watznaueria barnesiae</em>, consistent with previous findings indicative of significant diagenetic overprint. While the δ¹³C_carb record robustly captures the OAE 1d excursion, the characteristic CIE associated with the late Cenomanian to early Turonian OAE 2 is not well expressed. This attenuation is likely due to diagenetic overprinting and decrease in carbonate content, which may have altered or obscured primary palaeoenvironmental signals in the upper part of the Qiangdong section.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113552"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941351","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":"Quantitative histological analysis of dental variability in Anchitherium: insights into growth dynamics and dental development","authors":"Teresa Calderón ,&nbsp;Andrea Cuccu ,&nbsp;Jorge Morales ,&nbsp;Beatriz Azanza ,&nbsp;Daniel DeMiguel","doi":"10.1016/j.palaeo.2026.113557","DOIUrl":"10.1016/j.palaeo.2026.113557","url":null,"abstract":"<div><div>The correlation between enamel microstructure and life history has allowed researchers to gather important information on the dental growth and development of both extant and fossil taxa. The approach has been especially developed on primates but also applied to ungulates. Among them, equids have received particular attention, since the enamel microstructure has been examined in several species of hipparionines and <em>Equus</em>. However, this aspect has been completely unexplored in more basal equid taxa. In this work, we analyse the dental microstructure of upper and lower dental elements and calculate for the first time the dental parameters of <em>Anchitherium</em>, a three-toed equid that inhabited the Palaearctic region from the Early to Late Miocene<em>.</em> Results revealed significantly higher secretion rates in the first lower molar and similar extension rates in all the dental elements analysed. In addition, the study of both upper and lower elements in this work seems to indicate that the method of analysing only the lower dentition, as employed in many studies, may not provide the complete framework to make inferences (at least in <em>Anchitherium</em>) and hence, should be taken with caution. Comparing <em>Anchitherium</em> enamel parameters with more derived members of the family Equidae has allowed us to observe a clear correlation between enamel secretion rate and hypsodonty index, which increases over time, coinciding with the acquisition of hypsodont teeth. In parallel, a trend towards a faster pace of growth was identified over time, which could be related to the Miocene environmental changes. The present work deepens our understanding of equid dental development and the evolution of this iconic group of ungulates.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113557"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981307","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":"Recurrent catastrophic outburst floods in the Yarlung Tsangpo Gorge system: Chronology, magnitude, and climatic drivers","authors":"Jiantao Xie ,&nbsp;Na Yang ,&nbsp;Jingran Zhang ,&nbsp;Mengying He ,&nbsp;Chaogang Zheng ,&nbsp;Zhigang Zhang ,&nbsp;Xinggong Kong ,&nbsp;Zhijun Zhao ,&nbsp;Xilin Cao","doi":"10.1016/j.palaeo.2026.113553","DOIUrl":"10.1016/j.palaeo.2026.113553","url":null,"abstract":"<div><div>Catastrophic outburst floods from natural-dam failures are among Earth's most powerful landscape-sculpting agents, yet their long-term frequency and relationship with orbital-scale climate cycles remain poorly constrained. The Yarlung Tsangpo River in the eastern Himalaya provides an unparalleled setting to resolve this, but research has largely focused on Holocene events. Here, we extend this record into the deep past, presenting a comprehensive geomorphological and geochronological reconstruction of outburst floods extending back to ∼259 ka. We identify at least six distinct, high-magnitude outburst flood episodes based on field evidence of giant bars. Hydraulic modeling shows these events had colossal peak discharges ranging from 0.2 to 2.1 × 10⁶ m³/s. Robust single-grain post-infrared infrared stimulated luminescence (pIRIR) dating establishes a chronology securely linked to distinct clusters: an early series associated with Marine Isotope Stage (MIS) 8 and its termination (∼259 ka, &lt;242 ka, and ∼ 232 ka), followed by major events at ∼115 ka (MIS 5d), ∼18 ka (MIS 2), and ∼ 11 ka (Latest Pleistocene). Crucially, the stratigraphic tight coupling of flood deposits with immediately overlying paleosols provides physical evidence that these catastrophic failures were synchronous with rapid climatic transitions. This confirms a systematic causal mechanism: the advance of valley glaciers during cold stages (e.g., MIS 8, MIS 6, MIS 2) repeatedly dammed the river at the Gyaca Gorge, with catastrophic failure triggered during subsequent periods of climatic amelioration. Our findings reveal that glacial-interglacial climate cyclicity has exerted a first-order control on the pacing of the most extreme geomorphic events, fundamentally shaping the long-term landscape evolution of the world's highest mountain range.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113553"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145981297","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":"Miocene evolution of the Humboldt Current","authors":"John A. Barron ,&nbsp;Thomas J. DeVries ,&nbsp;Jason J. Coenen","doi":"10.1016/j.palaeo.2026.113558","DOIUrl":"10.1016/j.palaeo.2026.113558","url":null,"abstract":"<div><div>Diatom records from the East Pisco Basin (EPB) of southern Peru and offshore Ocean Drilling Program (ODP) Hole 682 A reveal stepwise increases in the primary productivity of the Humboldt Current during the middle and late Miocene. Although diatoms are present back through the late middle Eocene, successively enhanced diatom production occurs during the Miocene in four steps. The first step between 14.2 and 13.8 Ma marks the onset of diatom deposition in the Pisco-0 sequence. A second step at ∼12.9 Ma coincides with a major drop in global sea level during which diatom deposition ceased in the EPB but continued in ODP 682 A as well as in Chile, Ecuador, and Colombia. Beginning at 10.4 to 10.0 Ma, a major increase in diatom sedimentation rates in both the EPB and in ODP 682 A signals an abrupt intensification of the Humboldt Current productivity, which may be related to the closure of the Central American Seaway to deeper water circulation. A fourth step coincides with the transgressive deposition of the diatom-rich Pisco-2 sequence at 8.4 Ma and is enhanced by the onset of the global Late Miocene Biogenic Bloom (8.0–4.5 Ma). Between 7 and 6 Ma, common subtropical diatoms in ODP 682 A contrast with high diatom deposition rates in the EPB, suggesting variable El Niño-La Niña conditions. During this time, fossil vegetation evidence from southern Peru supports the presence of seasonal periods of enhanced rainfall typical of El Niño conditions. The Miocene trend of increasing sea mammal diversity in the EPB parallels these steps, further supporting stepwise enhancement of primary productivity in the Humboldt Current during the Miocene.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113558"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038987","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":"Holocene precipitation change in an East Asian sandy land: Perspectives from the grain size records of multi-sections","authors":"Zhuo Yang ,&nbsp;Dongmei Jie ,&nbsp;Guizai Gao ,&nbsp;Yutong Qian","doi":"10.1016/j.palaeo.2026.113545","DOIUrl":"10.1016/j.palaeo.2026.113545","url":null,"abstract":"<div><div>Integrating multiple climate proxies is vital for advancing regional climate reconstruction. This study minimizes uncertainty among records by analyzing four aeolian-paleosol profiles (ADQ, HTGL, MJ, FX) within China's Horqin Sandy Land, using grain size as the primary climate proxy. Initially, end-member analysis was employed to separate the end-member components from the different profiles. By combining topsoil particle size data and modern meteorological monitoring data, the relationship between coarse-grained components and climate factors was established, providing strong evidence for the coarse-grained end-members in the sections that represent regional climate change. Based on this, we employed the regional averaging method to extract regional climate signals represented by coarse-grained end-member components from various profiles. Simultaneously, by integrating the locations of each profile with records of human activities, we investigated whether these climate signals were influenced by local signals. The results indicate that the regional climate signals derived from multiple profiles (grain size range: 77.77–566.88 μm) accurately reflect a precipitation trend in the region during the Holocene, which initially increased and then decreased. Furthermore, the end-member components representing regional climate signals in profiles from different locations may be affected by human activities and natural environmental factors, leading to the contamination of these signals with their respective local environmental signals.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113545"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038982","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 Ailao Shan drainage divide is migrating northeastwards in response to the late Cenozoic kinematic reversal of the Red River Fault, southeastern margin of the Tibetan Plateau","authors":"Feng Shi ,&nbsp;Xibin Tan ,&nbsp;Yijia Ye ,&nbsp;Qiaoqiao Guo ,&nbsp;Shuang Bian","doi":"10.1016/j.palaeo.2026.113572","DOIUrl":"10.1016/j.palaeo.2026.113572","url":null,"abstract":"<div><div>The Red River Fault (RRF), an important block-boundary fault at the southeastern margin of the Tibetan Plateau, experienced a reversal in strike-slip direction in the late Cenozoic. The Ailao Shan is a mountain belt located parallel to the RRF on its southwestern side. The topographic analysis at the Ailao Shan may provide constraints for the kinematic reversal of the RRF and associated landform evolution. In this study, we analyze the drainage-divide stability at the Ailao Shan using χ-plot method. The results show that most segments of the Ailao Shan drainage divide are moving northeastwards (towards the RRF). This drainage-divide migration could be driven by differential uplift, dextral strike-slip faulting on the RRF, and/or the loss of drainage area of the Red River. To further constrain the vertical tectonic activity of the RRF, we analyzed channel steepness of rivers at the Ailao Shan based on the DEM. The results imply that the western segment of the RRF has normal fault activity, while the eastern segment does not. Overall, the results of topographic analysis at the Ailao Shan, including drainage-divide stability and the channel steepness index, jointly support that the RRF is a dextral strike-slip fault, with normal faulting component at its western segment. This study reveals that the landform of the Ailao Shan has not yet reached a steady state after the kinematic reversal of the RRF, and implies that the kinematic reversal might be a relatively young event.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113572"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038986","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":"Evolution of staggered Oligocene-Miocene transgressions and molluskan faunas in eastern Patagonian basins","authors":"Eduardo S. Bellosi ,&nbsp;Claudia del Río ,&nbsp;John McArthur ,&nbsp;Ian L. Millar","doi":"10.1016/j.palaeo.2026.113575","DOIUrl":"10.1016/j.palaeo.2026.113575","url":null,"abstract":"<div><div>Among the Cenozoic marine incursions in southern South America, the Chattian-Langhian <em>Patagoniense</em> episode is particularly significant due to its extensive spatial distribution, abundant fossil record, and comprehensive research history. It flooded several Atlantic basins, between S 40^o - 53^o, each with different tectonic context and infill history. In this work we present new geochronologic, stratigraphic, sedimentologic and paleontological data of the <em>Patagoniense</em> successions to evaluate basin evolution, sedimentation and their molluskan faunas; and to establish the regional architecture based on new correlations. The results confirm that the <em>Patagoniense</em> consisted of three separated transgressive episodes: <em>Juliense</em>, <em>Leonense</em> and <em>Superpatagoniense</em>, whose ages are here determined using Sr-isotope stratigraphy. Although largely overlooked before now as a separate transgression, we demonstrate that the <em>Superpatagoniense</em> interval is clearly distinguishable as a unique transgression, with an extensive record in basins of central and northern Patagonia between 15.9 and 15.0 Ma. The biostratigraphic reappraisal of the <em>Patagoniense</em> Molluskan Assemblages indicates that the youngest (NVG) fauna is preserved in the uppermost <em>Leonense</em> and <em>Superpatagoniense</em> beds, and can be calibrated between 17.0 and 15.0 Ma. This fauna was dominated by tropical genera, and ranged up to S 47^o during the Miocene Climatic Optimum, whilst also showing latitudinal changes in composition that are related to temperature. The three transgressions and the subsequent regressions exhibit a staggered pattern, being younger northwards. Such large-scale, orderly architecture would have responded to the independent or combined effects of several geological and climatic factors, but to date, none of them can be clearly established. They were not uniform or instantaneous, but rather propagated over ten million years across the marginal southeastern Atlantic basins. This tiered pattern suggests a common link between processes that controlled the transgressions, which must be considered in future works.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113575"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038984","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":"Redox-driven diagenetic impacts on sedimentary and magnetic records during late Pleistocene oceanographic evolution on the Ross Sea continental margin","authors":"Ji Young Shin ,&nbsp;Min Kyung Lee ,&nbsp;Yongjae Yu ,&nbsp;Sun Ki Choi ,&nbsp;Jong Kuk Hong ,&nbsp;Moon Son ,&nbsp;Young Ji Joo","doi":"10.1016/j.palaeo.2026.113576","DOIUrl":"10.1016/j.palaeo.2026.113576","url":null,"abstract":"<div><div>Sedimentary archives along the Ross Sea margin provide key insights into the interactions among Antarctic ice dynamics, bottom water formation, and depositional processes near the marine-based ice sheet. Here, we integrate sedimentological, geochemical, and magnetic records from a continental rise sediment core to reveal the late Pleistocene redox evolution and develop a refined age framework. A distinct redox transition is identified across the mid- to late Brunhes period, from reducing conditions—indicated by debilitated paleomagnetic signals, magnetite dissolution, and manganese depletion—to a more oxic interval enriched in maghemite and manganese-bearing phases. Sedimentary features straddling this boundary capture a shift from an ice-proximal deposition with reworked shelf materials to an ice-distal regime characterized by enhanced marine organic matter degradation and improved bottom water oxygenation. Combined relative paleointensity and lithostratigraphic alignments provide feasible chronological constraints for the last 400 kyr, although the iron reducing interval warrants careful consideration. The resulting chronology places the major stratigraphic and redox reorganization at ∼250 ka, coincident with the extensive Ross Sea ice retreat. These multi-proxy observations demonstrate that reductive magnetite loss during ice sheet expansions can substantially modify magnetic records near the Antarctic ice margin. Nevertheless, integrated sedimentary magnetic proxies remain effective tools for both developing age models and reconstructing past redox and cryosphere–ocean variability.</div></div>","PeriodicalId":19928,"journal":{"name":"Palaeogeography, Palaeoclimatology, Palaeoecology","volume":"686 ","pages":"Article 113576"},"PeriodicalIF":2.7,"publicationDate":"2026-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146038980","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}