Boreas最新文献

{"title":"Identifying the pre-Odra river system with hydroacoustic and seismic reflection imagery offshore Rügen Island, southern Baltic Sea","authors":"Maryse C. Schmidt,&nbsp;Elisabeth Seidel,&nbsp;Christian Hübscher,&nbsp;Benedikt Haimerl,&nbsp;Jonas Preine","doi":"10.1111/bor.70056","DOIUrl":"https://doi.org/10.1111/bor.70056","url":null,"abstract":"<p>Understanding the course and dynamics of ancient river systems, such as the pre-Odra, provides valuable insights into the post-glacial evolution of landscapes and riverine processes. The northwest-trending pre-Odra was an important drainage system of the European mainland into the Baltic Basin during and after the Scandinavian Ice Sheet retreat. However, there are still uncertainties about the course and extent of the pre-Odra river and its evolution. In this study, we combine parametric sediment echo-sounder and high-resolution multi-channel reflection seismic data to identify and map the actual course of the former river and analyse its morphology and stratigraphic infill since the Baltic Ice Lake formed around 15 ka BP. Our integrated analysis reveals that biogenic gas anomalies within the Late Pleistocene and Early Holocene valley infill closely align with the seismically identified pre-Odra valley. In areas where channel morphology is poorly resolved, gas-related seismic signatures provide an additional method to trace the buried river system. In the southern Pomeranian Bay, a dense forking network of narrow channels records the braided phase of the river, with possible connection to the rivers Ryck and Peenestrom near Mönchgut (southeast Rügen Island). The narrow channels merge northwards to a single, wider channel, which can be traced as far as the Tromper Wiek. These results indicate that under suitable conditions, multi-channel marine reflection seismic-based gas mapping can support the reconstruction of buried fluvial systems even where high-resolution parametric sediment echosounder data are limited. These findings reaffirm that the pre-Odra exploited ancient meltwater drainage systems after the last glacial and improve our understanding of the post-glacial landscape evolution in the southern Baltic Sea.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"790-807"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70056","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Taxonomic and functional diversity of benthic foraminifera as a promising proxy for tidewater glacier retreat","authors":"Eleonora Fossile,&nbsp;Mattia Ghilardi,&nbsp;Meryem Mojtahid,&nbsp;Hélène Howa,&nbsp;Agnès Baltzer,&nbsp;Maria Pia Nardelli","doi":"10.1111/bor.70068","DOIUrl":"https://doi.org/10.1111/bor.70068","url":null,"abstract":"<p>Ice sheets and glaciers globally are losing mass at increasing rates, with the strongest changes occurring at tidewater glaciers. These are rapidly retreating and often transitioning to land-terminating with implications for sea level change and ecosystem functioning. However, reconstructions of past tidewater glacier dynamics are currently limited to short time scales (i.e. decades), which affects the accuracy of future predictions. Given the strong response of benthic marine biodiversity to tidewater glacier-induced environmental gradients, small fossilizing organisms such as foraminifera may prove to be a reliable ecological proxy for glacier termini positions on longer time scales. Here, we test living benthic foraminiferal taxonomic and functional diversity along a decreasing gradient of environmental stress off the Kronebreen tidewater glacier front in Kongsfjorden, Svalbard. Additionally, we test four traditional size fractions used for foraminiferal analysis (i.e. &gt;63, &gt;100, &gt;125 and &gt;150 μm) to statistically define the best compromise providing reliable information with minimal analytical time. Both taxonomic and functional diversity increased with increasing distance from the glacier front. The observed diversity patterns were consistent across size fractions, although some were not detected by the largest size fraction (&gt;150 μm). The size fraction &gt;125 μm seems to represent the best compromise to obtain reliable ecological information. We hypothesize that reduced glacier-induced disturbance away from the glacier front increases the availability of ecological niches, which in turn allows the establishment of functionally diverse species. Conversely, only few opportunistic species with reduced functional diversity were associated with the highly unstable environment near the glacier front. The progressive benthic foraminiferal diversity loss observed towards the glacier front is a potential ecological proxy for tidewater glacier dynamics in historical and palaeo-reconstructions. Its effectiveness and robustness to seasonal variability and taphonomic processes should be tested on historical records.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"885-902"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148522740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Palaeowinds and depositional conditions from Holocene loess in Sweden and Finland","authors":"Calum J. Edward,&nbsp;Thomas Stevens,&nbsp;Anu Kaakinen,&nbsp;Jukka-Pekka Palmu,&nbsp;Juha-Pekka Lunkka,&nbsp;Ramona Schneider,&nbsp;Bjarne Almqvist","doi":"10.1111/bor.70057","DOIUrl":"https://doi.org/10.1111/bor.70057","url":null,"abstract":"<p>The nature of deglacial and Holocene wind regimes in Fennoscandia is debated, as is the degree to which wind-blown loess deposits exist in the region. Loess deposits in Fennoscandia are often relatively thin, discontinuous and less well-sorted than typical loess, and questions remain over the degree of their post-depositional reworking and the impact on absolute age estimates. <i>In situ</i> loess deposits in the region would have the potential to constrain dust-transporting wind regimes during loess deposition. Here we address this using detailed mapping, grain size and anisotropy of magnetic susceptibility (AMS) analyses. The study introduces the first application of AMS to loess in Fennoscandia, to test (i) the degree of reworking of Fennoscandian loess, (ii) the nature of dust-transporting winds, and (iii) their correspondence to associated source deposits and dune fields. We extend previously known loess distributions and assess the degree to which depositional and post-depositional processes are recorded in the sedimentary fabrics. Our results highlight widespread physical disturbance, pedogenesis, slope and subaqueous deposition in the many loess deposits in the region, which impacts their suitability for reliable age dating. Despite this, we demonstrate that <i>in situ</i> and non-reworked loess also exists in the region. The combination of the loess distribution and its aeolian AMS fabrics, alongside grain size and deposit thickness changes, indicates loess deposition under prevailing N-NE winds. This contrasts with N-NW winds inferred from the form of nearby parabolic dunes. While published luminescence ages from Swedish loess are at times Middle or even Late Holocene in age, we propose that these may be underestimates due to widespread reworking of loess shown in our post-depositional AMS fabrics. We therefore conclude that Swedish-Finnish loess was deposited on hills under a predominant northeasterly, anticyclonic synoptic-scale wind regime occurring in the presence of the decaying Fennoscandian Ice Sheet during deglaciation. By contrast, the form of dunes in nearby valley bottom dune fields is likely affected by aeolian reworking under dominant westerly winds redirected at the surface by valley topography later in the Holocene, while the loess deposits remained in place.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"808-834"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70057","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Droughts and human impact in the ancient Uaymil region of the Maya lowlands inferred from a 2800-year sedimentary archive at Lake Kaná, Mexico","authors":"Haydar B. Martinez-Dyrzo,&nbsp;Priyadarsi D. Roy,&nbsp;Benjamin Gwinneth,&nbsp;Irma G. Vargas-Martinez,&nbsp;Alejandro A. Aragon-Moreno,&nbsp;Roger Medina-Gonzales","doi":"10.1111/bor.70053","DOIUrl":"https://doi.org/10.1111/bor.70053","url":null,"abstract":"<p>The relationship between the climate and societal transformation in Maya lowlands has long been debated, particularly the role of drought in shaping the civilization trajectory during the Classic Period. A high-resolution, multi-proxy, geochemical record from Lake Kaná, located in the underexplored Uaymil region of the Yucatán Peninsula in Mexico, helped to reconstruct the dynamics of detrital input, redox condition, organic productivity, and carbonate precipitation over the past ~2800 cal. years. Principal component analysis (PCA) of selected elements and their ratios integrated the responses to hydroclimate dynamics by yielding two rainfall-sensitive indices, that is a focused Rainfall Index (from Al/Sr, Ti/Sr, and −Sr/Ca) and a broader element-based Rainfall Index, for the effective and meteoric rainfalls, respectively. This new record revealed diminished detrital flux, enhanced redox stratification and low-carbonate precipitation around 1652, 1200–900 and 600–540 cal. a BP, suggesting drought episodes and more water column anoxia. Inorganic carbon content below 5% in most of the sequence, notably, a rare condition in karstic lakes, likely resulted from sustained redox environment, siliciclastic dilution and clay-mediated inhibition of calcite nucleation. Our results also indicated human activities between 1600–1200 cal. a BP, but of low influence. Both the climatic and anthropogenic responses captured here contribute to the growing evidence of complex climate-society interactions across Mesoamerica and highlight the importance of an integrated geochemical approach in neotropical palaeoenvironmental reconstructions.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"768-789"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70053","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Flow-pattern evolution of the Scandinavian Ice Sheet indicated by the subglacial lineation record over Norway, Sweden and Finland","authors":"Frances E. G. Butcher,&nbsp;Anna L. C. Hughes,&nbsp;Helen E. Dulfer,&nbsp;Christopher D. Clark,&nbsp;Jeremy C. Ely,&nbsp;Emma L. M. Lewington,&nbsp;Benjamin M. Boyes,&nbsp;Alex C. Scoffield,&nbsp;Stephen Howcutt,&nbsp;Christiaan R. Diemont","doi":"10.1111/bor.70050","DOIUrl":"https://doi.org/10.1111/bor.70050","url":null,"abstract":"<p>Streamlined subglacial bedforms, including drumlins, mega-scale glacial lineations, crag-and-tails and roche moutonnées, provide evidence for the past flow of large mid-latitude ice sheets during the late Quaternary. Empirical reconstructions of palaeo-ice sheet flow, based on such landforms, provide valuable insights into how ice sheets evolve over time and adjust their internal dynamics in response to climate change. We present a new 25-stage reconstruction of changing flow directions of the Scandinavian Ice Sheet (SIS) based on systematic mapping of ~240 000 subglacial bedforms across Norway, Sweden, Finland and parts of NW Russia. Of these, 23 stages depict the ice flow evolution during advance and retreat of the SIS through Marine Isotope Stage (MIS) 2. Two additional stages likely represent flow patterns of an earlier ice sheet (potentially MIS 4 or older). Our reconstruction was enabled by the recent revolution in the availability of high-resolution (1–2 m) digital terrain models. It is based on 611 flowsets, which summarise discrete ice-flow patterns recorded by subglacial lineations and are individually categorised by their glaciodynamic contexts. The reconstruction honours the relative-age chronology of flowsets indicated by cross-cutting relationships of the subglacial lineations. We reconstruct, and provide maps of, changing ice-sheet flow patterns and the migration of ice divides starting with ice-sheet inception, through advance and subsequent deglaciation, and ultimately the fragmentation into independent ice masses. The primary ice divide migrated up to 500 km and developed a branched configuration during deglaciation. The reconstruction of SIS flow patterns we present is the most detailed and comprehensive to date, and the fact that we independently verify many properties of the ice sheet invoked by earlier workers is testament to the quality, rigour and enduring legacies of those studies. We release flowsets, relative chronology and flow-pattern data along with a dataset of ~58 000 lineation linkages which summarise our detailed landform mapping and were invaluable for reconstructing ice-flow patterns at the ice-sheet-scale. In releasing these data, we intend for them to serve as useful inputs or comparative data for future studies in palaeoglaciology. This includes, for example, approaches combining flow pattern information with numerical ice sheet modelling to improve representations of ice sheet behaviour. Such improvements should yield increased robustness of information on time-varying glacio-isostatic loading by the ice sheet, relevant for sea-level forecasting. Our datasets also have wide utility for applications beyond palaeoglaciology, such as for mineral exploration.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"612-669"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Revised classification of glaciofluvial landforms in the Finnish sector of the Fennoscandian Ice Sheet","authors":"Jussi Hovikoski,&nbsp;Jukka-Pekka Palmu,&nbsp;Tapio Väänänen,&nbsp;Markus Valkama,&nbsp;Antti E. K. Ojala,&nbsp;Satu Putkinen,&nbsp;Reijo Pitkäranta","doi":"10.1111/bor.70060","DOIUrl":"https://doi.org/10.1111/bor.70060","url":null,"abstract":"<p>Effective and sustainable land use, conservation, and the use of geological resources (incl. raw materials, aggregates and groundwater) require a clear classification system of sedimentary units, with well-defined vocabulary and unified mapping practices. To ensure harmonization of the GTK's (Geological Survey of Finland) map database of Finnish Quaternary surficial features, classification criteria for glaciofluvial landforms have been updated. The work is based on earlier geological field mapping of surficial Quaternary deposits as well as previous and ongoing LiDAR DEM-based mapping of glaciofluvial landforms in Finland. In this paper, we present the updated classification and terminology, discuss the defining criteria of glaciofluvial map unit types and show their representative examples. Inherent challenges and limitations of this remote sensing-based mapping approach are also discussed.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"702-716"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70060","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148522784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Drilling the Marathousa palaeo-lake in Greece (Peloponnese): inferring the environmental context of a Middle Pleistocene archaeological site","authors":"Ines J. E. Bludau,&nbsp;Bernd Wagner,&nbsp;Uwe Kirscher,&nbsp;Maria Schindler,&nbsp;Charlotte Zachow,&nbsp;Johannes Schmidt,&nbsp;Niklas Leicher,&nbsp;Giovanni Muttoni,&nbsp;Serena Perini,&nbsp;Vangelis Tourloukis,&nbsp;Eleni Panagopoulou,&nbsp;Panagiotis Karkanas,&nbsp;Katerina Harvati,&nbsp;Annett Junginger","doi":"10.1111/bor.70061","DOIUrl":"https://doi.org/10.1111/bor.70061","url":null,"abstract":"<p>The Megalopolis Basin is located in the central Peloponnese (Greece), a region that is situated along one of the primary Pleistocene biogeographical corridors for intracontinental hominin migration. The basin comprises several hundred metres of Plio-Pleistocene sediments alternating between clastics and lignites. Of these sediments, a 6 m thick succession deposited during the cold Marine Isotope Stage (MIS) 12 (~480–420 ka) was intensely studied after the discovery of evidence for hominin presence in these strata at the Marathousa 1 Lower Palaeolithic site. The local environmental conditions prior to and after this period, however, are still unknown. Here, we present the results of sedimentological analyses of two &gt;100 m long drill cores (MAR18-1A and MAR18-2A) and two outcrops (MAR19-2AP, Choremi-6) in order to provide palaeoenvironmental constraints on the Megalopolis Basin between ~780 and 340 ka. Our age control is based on palaeomagnetic analysis conducted on the drill core MAR18-1A and the Choremi-6 outcrop, as well as correlations to formerly studied cores and outcrops. The geochemical and lithological proxies and their statistical processing reveal that the basin was characterized by a periodically changing environment influenced by a deltaic river during dry and/or cold intervals (clastic layer deposition) and lacustrine environments that were fringed by lush, limno-telmatic vegetation during humid and/or warm periods (lignite seam formation). Our results provide high-resolution insights into climatic changes in the immediate surrounding of the archaeological sites in the Megalopolis Basin during the Early to Middle Pleistocene, disclosing further investigation opportunities on palaeoclimate, palaeoenvironment and human activity in the region.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"866-884"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70061","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Late Holocene moisture variability in Arctic Alaska from chitin δ18O","authors":"Briana A. Edgerton,&nbsp;Melissa L. Chipman","doi":"10.1111/bor.70052","DOIUrl":"https://doi.org/10.1111/bor.70052","url":null,"abstract":"<p>Amplified warming in the Arctic has resulted in reduced sea-ice extent, which can impact regional climate dynamics. Elucidating past moisture variability in response to changing temperatures and sea-ice conditions can offer insight into how anthropogenic climate change may impact Arctic areas such as the Alaskan North Slope in the future. We contribute a new high-resolution record of precipitation variability from Lake GTH90 located on the Alaskan North Slope. This new record is based on the isotopic composition of chitin from lake sediments and adds to a growing suite of Late Holocene climate records in northern Alaska. An overall decrease in δ¹⁸O values from 3.5 cal. ka BP to present at Lake GTH90 is coincident with Neoglacial cooling associated with a millennial-scale decrease in summer insolation. The highest and most variable δ¹⁸O values occur between 3.5 and 2.6 cal. ka BP and the lowest values are centred around 0.5 cal. ka BP, indicating isotopically depleted precipitation during the Little Ice Age. Isotopic variability in our record on centennial timescales is consistent with temporal variability in sea-ice extent in the Arctic Ocean in the Late Holocene, suggesting that periods of high sea-ice extent inhibited Arctic moisture sources and long-distance moisture transport from the North Pacific became dominant. In addition, we compare regional records to evaluate how shifts in the strength and position of the Aleutian Low may have also contributed to Late Holocene precipitation in this region.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"751-767"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148533131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"An overview of Mass Accumulation Rates in key Polish loess–palaeosol sequences derived from luminescence chronologies","authors":"Maksymilian Jędrzejowski,&nbsp;Zoran M. Perić,&nbsp;Zdzisław Jary,&nbsp;Slobodan Marković,&nbsp;Piotr Moska,&nbsp;Grzegorz Poręba,&nbsp;Agnieszka Szymak,&nbsp;Andrzej Wojtalak","doi":"10.1111/bor.70067","DOIUrl":"https://doi.org/10.1111/bor.70067","url":null,"abstract":"<p>Loess–palaeosol sequences (LPS) represent one of the most important continental archives of late Quaternary environmental change in Europe. Establishing reliable chronologies is essential for reconstructing dust dynamics and for correlating regional loess stratigraphies. In this study, we present the first systematically derived mass accumulation rate (MAR) dataset for six key Polish LPS, based on high-resolution Optically Stimulated Luminescence dating of the 45–63 μm quartz fraction. Bayesian age–depth models were constructed using the Bacon software. The results demonstrate pronounced temporal and spatial variability in loess accumulation across southern Poland. All profiles show maximum MARs during MIS 2, with exceptionally high values exceeding 1000 g m⁻² a⁻¹ at Trzebnica, Tyszowce and Strzyżów sites. In contrast, Zaprężyn site exhibits lower MARs with only localized peaks. The results highlight the utility of luminescence-derived MARs for investigating regional aeolian dynamics, while also emphasizing the methodological limitations imposed by chronological uncertainties and sampling resolution.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"835-845"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148534228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Luminescence dating of coastal deposits from the Chanthaburi Plain, Thailand","authors":"Margarita Nuss,&nbsp;Sakonvan Chawchai,&nbsp;Savanna Kager,&nbsp;Smith Leknettip,&nbsp;Yunyi Li,&nbsp;Kannika Wangritthikraikul,&nbsp;Frank Preusser","doi":"10.1111/bor.70063","DOIUrl":"https://doi.org/10.1111/bor.70063","url":null,"abstract":"<p>The ongoing global sea-level rise urges us to better understand the dynamics of coastal processes for predicting future changes. Sedimentary deposits reflect past coastal environments but require precise chronological data to place evidence into a temporal context. While radiocarbon dating is widely employed, it is associated with several methodological challenges and frequently there is an absence of datable material in coastal deposits. Luminescence dating provides an important advantage over radiocarbon by directly determining the time of sediment deposition. However, this method is affected by problematic issues such as partial bleaching, bioturbation and dose rate assessment, which can lead to inaccurate age determinations. As a case study demonstrating good scientific practice in luminescence dating, we investigated deposits from the Chanthaburi Plain, Thailand, for reconstructing past coastal dynamics. Luminescence screening is used to identify potential signal disturbances and select appropriate sample positions in the drill cores. Luminescence dating was performed on 13 samples accompanied by detailed analysis regarding dose rate with a focus on water content and radioactive disequilibrium. The dated samples indicate depositional ages ranging between 7.2 and 4.6 ka. Comparison with radiocarbon ages (18 samples) reveals that plant material often represents modern roots and that molluscs tend to systematically underestimate the sedimentation age, likely due to partial recrystallisation. Our data suggest at <i>c</i>. 6.5 ka, a location of the coastline ~8.1 km inland from the present position. At around 4.6 ka, the coastline was about 7.2 km from the present shore. Together with previously published data, this indicates a sea-level regression from the Middle Holocene highstand towards the Late Holocene.</p>","PeriodicalId":9184,"journal":{"name":"Boreas","volume":"55 3","pages":"846-865"},"PeriodicalIF":2.3,"publicationDate":"2026-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bor.70063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}