Marine Geology最新文献

{"title":"Sea level changes and the Indian Summer Monsoon influence on chemical weathering and sediment deposition on the Ninetyeast Ridge over the past 21 ka","authors":"Md. Sazzad Hossen ,&nbsp;Jianguo Liu ,&nbsp;Yun Huang ,&nbsp;Md Hafijur Rahaman Khan ,&nbsp;Bin Wang","doi":"10.1016/j.margeo.2025.107632","DOIUrl":"10.1016/j.margeo.2025.107632","url":null,"abstract":"<div><div>The sediment core retrieved from the Ninetyeast Ridge (NER) provides valuable insights into the interplay between chemical weathering processes and sediment deposition patterns in the marine environment. This interplay is strongly influenced by fluctuations in sea level and variations in the Indian Summer Monsoon (ISM). In this study, geochemical analyses of elemental compositions suggest that the Last Glacial Maximum (LGM) (∼21–19 ka) was a period of enhanced chemical weathering, likely driven by lowered sea levels and intensified glacial or aeolian activity. Concurrently, high surface productivity and reduction in bottom-water oxygenation favored the accumulation of organic carbon in the sedimentary record. In contrast, the deglacial period (∼17–11 ka) was characterized by rapid sea-level rise and dynamic monsoon evolution. This interval generally exhibited oxic bottom-water conditions, except for the Bølling–Allerød (B/A) interstadial. During the B/A event, increased sedimentation rates coincided with elevated paleoproductivity and suboxic marine conditions. The Holocene epoch reflects a shift, as rising sea levels and intensified ISM activity promoted enhanced chemical weathering in source regions. Notably, the Holocene Climatic Optimum (HCO) stands out as a period when increased solar insolation and strengthened monsoon circulation within the Indo-Pacific Warm Pool contributed to bottom-water deoxygenation and increased marine productivity. These findings highlight the intricate coupling between sea-level fluctuations and monsoonal forcing in modulating chemical weathering regimes and deep-sea sedimentation dynamics in the Indian Ocean basin.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"489 ","pages":"Article 107632"},"PeriodicalIF":2.2,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Dating ‘Zebra’: A subaerial to ultra-shallow marine Lomonosov Ridge at the end of the Oligocene?","authors":"Francesca Sangiorgi ,&nbsp;Evi Wubben ,&nbsp;Suning Hou ,&nbsp;Henk Brinkhuis","doi":"10.1016/j.margeo.2025.107618","DOIUrl":"10.1016/j.margeo.2025.107618","url":null,"abstract":"<div><div>Twenty years after the pioneering IODP Expedition 302 (ACEX) to the Lomonosov Ridge, central Arctic Ocean, a robust age model was still lacking. This was foremost due to the overall poor core recovery, and frequent lack of age diagnostic features including (micro)fossils, notably in the likely Neogene succession. Interestingly, one of the few intervals that were relatively well-recovered was interpreted to span the Paleogene-Neogene transition. On board and follow up marine palynological studies indicated that within this interval, a potential ∼26 Myr long hiatus separated the local top of the Paleogene (∼44 Ma) from the Neogene (∼18 Ma), occurring between local lithological subunits 1/6 and 1/5. The latter was informally also referred to as the ‘<em>Zebra</em>’ interval, owing to its characteristic black/white alternations in the colour of the sediments. This hiatus would possibly imply a subaerial or ultra-shallow marine Lomonosov Ridge during late Oligocene to early Miocene times. A Neogene, (late) Early Miocene age for the base of ‘<em>Zebra’</em> subunit 1/5 was tentatively provided by the finding of a new, later formally described, organic walled dinoflagellate cyst (dinocyst) genus we named <em>Arcticacysta</em>, which included two species, <em>A. backmanii</em> and <em>A. moraniae</em>. Subsequent work challenged the presence of a hiatus and the age of the ‘<em>Zebra’</em> subunit.</div><div>Here we present recent palynological (dinocyst) findings from Miocene sediments retrieved from the Pennell Basin during IODP Expedition 374 (Ross Sea, Antarctica) that contain the first appearance at 17.7 Ma of specimens of the same dinocyst genus, <em>Arcticacysta</em>, and species, and a more continuous presence between 17.0 and 15.9 Ma. Providing that the (first) occurrence of this dinocyst genus is synchronous in both (polar) records, these findings confirm the assignment of the Arctic Ocean ‘<em>Zebra</em>’ interval to the (late) Early Miocene, adding evidence for a large hiatus characterizing the Paleogene/Neogene transition on the Lomonosov Ridge.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"489 ","pages":"Article 107618"},"PeriodicalIF":2.2,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144750477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanisms and seasonal variability of sediment transport in a small tropical mountainous estuary-coastal system: Insights from the Selangor River, Malaysia","authors":"Haoshen Liang ,&nbsp;Aijun Wang ,&nbsp;Chui Wei Bong ,&nbsp;Shuqin Tao ,&nbsp;Boyu Liu ,&nbsp;Kar Hoe Loh ,&nbsp;Xiang Ye ,&nbsp;Yi You Wong ,&nbsp;Haiqi Li ,&nbsp;Choon Weng Lee","doi":"10.1016/j.margeo.2025.107619","DOIUrl":"10.1016/j.margeo.2025.107619","url":null,"abstract":"<div><div>Small- and medium-sized mountainous rivers (SMRs) are critical pathways for delivering terrestrial sediment to coastal systems, particularly in the tropical regions where their dynamics are highly sensitive to anthropogenic influences. This study investigates the sediment transport processes and ultimate deposition patterns in the Selangor River estuary, Malaysia - a representative tropical macrotidal estuary characterized by complex nearshore topography and weak Coriolis effects. By combining field measurements (2023–2024) with sediment analysis, this research reveals three key findings. First, approximately 73.5 % of the annual sediment discharge (19.75 × 10⁴ t) accumulates in estuarine tidal flats, with the northern tidal flats receiving twice the deposition of the southern tidal flats. Second, distinct seasonal transport regimes were evident: (i) during the dry season wave-driven sediment resuspension and tidal forces result in northwestward-southeastward transport, (ii) during the wet season stratified flows lead to significant sediment-freshwater decoupling, where river plumes disperse offshore while terrestrial sediments remain trapped near the estuary. Third, the unique sediment trapping mechanism, different from both large river systems and wave-dominated tropical SMRs, resulting from the interaction of strong tidal currents, seasonal river discharge, and offshore water intrusion form the Strait of Malacca. These findings provide a new conceptual framework for understanding sediment retention in tropical macrotidal estuaries, with implications for coastal management under climate change and intensifying anthropogenic pressures.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107619"},"PeriodicalIF":2.6,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144678898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reconstructing Holocene seismic and tsunami history along the Rio Grande coast, Oaxaca, Mexico","authors":"Oswaldo Coca ,&nbsp;María Teresa Ramírez-Herrera ,&nbsp;Krzysztof Gaidzik ,&nbsp;Steven L. Forman ,&nbsp;Víctor Vargas-Espinosa ,&nbsp;Luis Ramón Velázquez-Maldonado ,&nbsp;Néstor Corona ,&nbsp;Ana Carolina Ruiz-Fernández","doi":"10.1016/j.margeo.2025.107617","DOIUrl":"10.1016/j.margeo.2025.107617","url":null,"abstract":"<div><div>This study aims to identify past earthquakes and tsunamis in the Oaxaca region of Mexico, a segment of the subduction zone between the Cocos and North American plates. We reconstructed paleoelevations from the sedimentary record using diatom-based transfer functions to identify co-seismic, post-seismic, inter-seismic, and permanent deformation associated with land-level changes. To achieve this, we developed a paleoelevation model using modern diatoms. Up to four allochthonous sand layers were identified as tsunami deposits and their triggering earthquakes, associated coseismic uplift and subsidence. Unit 1 (1769 ± 74 CE) records co-seismic uplift of 0.065 ± 1.04 m and is associated with the 1787 M8.6 earthquake and tsunami. Unite 2 (1085 ± 40 CE) records a co-seismic uplift of 0.082 ± 0.93 m. Unite 3 (830 ± 45 CE) shows a co-seismic subsidence of −0.091 ± 1.08 m. Unite 4, dated between 811 and 751 cal BC and 766–465 cal BC, records a co-seismic uplift of 0.513 ± 0.37 m, likely caused by a &gt; M7.5 tsunamigenic earthquake. The reconstructed magnitudes, inferred from land-level changes, reveal a variable seismic history. Finally, we identified a cumulative permanent uplift deformation of 0.76 m over the last 2800 years.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107617"},"PeriodicalIF":2.6,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144633331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the response and recovery of beach sediments under the impact of Typhoon “Chaba” (no. 2203) and high-elevation aquaculture pond effluent discharge","authors":"Mingming Yuan ,&nbsp;Liping Huang ,&nbsp;Yuehua Qi ,&nbsp;Dezhi Chen ,&nbsp;Longbo Deng ,&nbsp;Lintao Zhao ,&nbsp;Gaocong LI","doi":"10.1016/j.margeo.2025.107616","DOIUrl":"10.1016/j.margeo.2025.107616","url":null,"abstract":"<div><div>Under the combined influences of climate change and human activities, coastal sediments dynamic and recovery mechanisms following extreme storm events have become central issues in coastal research and management. This study investigates beach sediment dynamics and recovery processes under the joint effects of Typhoon No. 2203 “Chaba” and high-elevation aquaculture pond (HEAP) effluent discharge. The key findings are as follows: Typhoon forcing conditions: During the event, wind direction shifted from ES to N and wind speed rose from 6.46 m/s to 14.43 m/s, superimposed on a 4.18 m storm surge. The mean wave period and significant wave height rose to 7.34 s and 1.38 m, respectively, while the shear-stress due to waves surged from 0.20 to 4.20 N/m²—far exceeding the threshold shear-stress of 0.60 N/m². On the normal beach, typhoon events led to finer sediment deposition on the upper beach and coarser sediment on the lower beach. These changes rapidly returned to the pre-typhoon state within one week. On the impacted beach, typhoon events and aquaculture effluent significantly altered sediment distribution. Combined effects of effluent-driven morphology and hydrodynamics caused complex patterns and limited recovery. Effluent discharge, tidal action, and wave dynamics collectively establish a high-energy conduit system that extends the landward reach of tidal inundation and intensifies erosion at the beach berm and coastal dune front. This synergistic forcing underlies the rapid evolution of scour-trench and grain-size distributions during extreme events. Therefore, it is recommended to implement coordinated strategies in terms of drainage outlet placement, ecological protection measures, and management practices. These measures aim to promote harmony between aquaculture and the beach environment, ensuring sustainable ecological and economic development.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107616"},"PeriodicalIF":2.6,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605928","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Floc size asymmetry modulated by tidal dynamics drives net landward sediment transport in a man-made tidal channel","authors":"Wenjian Li ,&nbsp;Guan-hong Lee ,&nbsp;Jongwi Chang ,&nbsp;Ojudoo Darius Ajama ,&nbsp;Zhenyan Wang","doi":"10.1016/j.margeo.2025.107615","DOIUrl":"10.1016/j.margeo.2025.107615","url":null,"abstract":"<div><div>In natural aquatic systems, flocculation affects sediment transport by altering particle size and settling velocity. However, the asymmetry in floc size over tidal cycles and its influence on sediment transport, especially in turbid coastal regions affected by human activities, remains understudied. This study uses comprehensive observations from ADV, HR-ADCP, Signature ADCP, LISST, and CTD within a man-made tidal channel located on the west coast of the Korean Peninsula to elucidate the size-dependent sediment transport process. Our findings reveal a tidal asymmetry in bottom shear velocity and particle size distribution (PSD). During ebb tide, the bottom shear velocity was higher, but suspended sediment concentration (SSC), Total Volume Concentration (TVC), and mean size (<span><math><msub><mi>M</mi><mi>z</mi></msub></math></span>) were lower compared to flood tide. This suggests that advection transport, in addition to resuspension, is a significant source of particles during flood tide. These particles increased SSC, TVC, and landward sediment flux, while low shear velocity facilitated flocculation, resulting in higher <span><math><msub><mi>M</mi><mi>z</mi></msub></math></span>. Consequently, a higher proportion of microflocs and macroflocs occurred, leading to a higher settling flux from flood tide to high slack water. In contrast, weaker advection transport and low SSC during ebb tide led to lower seaward sediment flux, with stronger shear velocity and lower concentration resulting in weak flocculation and lower <span><math><msub><mi>M</mi><mi>z</mi></msub></math></span>. During ebb tide, flocculi (10–20 μm diameter) exceeded microflocs and macroflocs, causing a lesser settling flux. This tidal asymmetry in floc size explains the trapping of larger particles during flood tide and high water levels, ultimately leading to net landward sediment flux in the channel over tidal cycles.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107615"},"PeriodicalIF":2.6,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Bering Sea shelf as a sink for terrigenous organic carbon: Insights from sediment geochemistry","authors":"Song Zhang ,&nbsp;Zhongqiao Li ,&nbsp;Bassem Jalali ,&nbsp;Youcheng Bai ,&nbsp;Zhongqiang Ji ,&nbsp;Hongliang Li ,&nbsp;Haiyan Jin ,&nbsp;Jianfang Chen","doi":"10.1016/j.margeo.2025.107614","DOIUrl":"10.1016/j.margeo.2025.107614","url":null,"abstract":"<div><div>Recent Arctic warming has accelerated permafrost thaw, mobilizing ancient organic carbon (OC) into the ocean. The Bering Sea, connected to major rivers such as the Yukon and Anadyr, receives substantial terrigenous carbon inputs. However, the sources and fate of the terrigenous OC remain poorly characterized. In this study, we aimed to assess the sources and sinks of organic matter on the Bering Sea Shelf by analyzing multi parameters such as TOC, TN, δ¹³C, lignin phenols, grain size and SSA of the surface sediments. OC and TN exhibit similar spatial patterns, with higher concentrations in the western region but lower along the Alaska Coastal Current (ACC). δ¹³C values decreased from east to west, ranging from −24.36 ‰ to −22.03 ‰, suggesting a westward decline in terrigenous OC influence, corroborated by C/N ratios. Lignin content (Λ8) varies from 0.49 to 4.58 mg/100 mg OC, peaking near the Yukon River estuary. Ratios of syringyl to vanillyl (S/V) and cinnamyl to vanillyl (C/V) phenols indicate mixed inputs from angiosperms and gymnosperms. Our findings demonstrate that the distribution of terrigenous OC is primarily governed by hydrodynamic sorting and mineral surface adsorption. We conclude that the Bering Sea shelf functions as a net sink for terrigenous organic carbon, a phenomenon expected to intensify with anticipated Arctic warming.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107614"},"PeriodicalIF":2.6,"publicationDate":"2025-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Two millennia of intense tropical cyclone activity in the western North Pacific: Insights from coastal boulder deposits","authors":"Kenta Minamidate ,&nbsp;Takashi Ishizawa ,&nbsp;Hironobu Kan ,&nbsp;Yusuke Yokoyama ,&nbsp;Naoto Koiwa ,&nbsp;Akifumi Ito ,&nbsp;Kazuhisa Goto","doi":"10.1016/j.margeo.2025.107612","DOIUrl":"10.1016/j.margeo.2025.107612","url":null,"abstract":"<div><div>Tropical cyclones (TCs) are among the most destructive hydrodynamic disturbances, yet our knowledge of their long-term climatology is limited by the short length of observational records. Geological records provide valuable insights into TC activity before modern observation. Although the western North Pacific (WNP) is the most active TC basin, little is known about how intense TCs have responded to long-term climate variability. Here, this study presents a new two-millennia record of intense TC activity from coastal boulder deposits on Amami-Oshima Island in the Ryukyu Islands, Japan. The results indicate reduced TC activity during colder periods, including the Late Antique Little Ice Age (LALIA; 540–660 CE) and the Little Ice Age (LIA; 1400–1700 CE), and increased activity from the end of cold periods to warm periods, including the Medieval Climate Anomaly (MCA; 950–1250 CE) and the Current Warm Period (CWP; 1850 CE–present). Our integration of paleo-TC and paleoclimate records shows that TC activity had been synchronously activated during warm periods at middle latitudes in the WNP; however, it had been enhanced during the LIA at low latitudes. These meridional anti-phase patterns are likely driven by the variability in air and sea surface temperature and associated shifts in the Hadley circulation. Given the unprecedented rise in global mean temperature, ongoing climate change may drive significant changes in TC behavior, potentially mirroring or exceeding past warm-period trends.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107612"},"PeriodicalIF":2.6,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144556701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Supra-subduction lithospheric metasomatism and water outflux beyond island-arc volcanism","authors":"Mengming Yu ,&nbsp;Chi-Yue Huang ,&nbsp;Graciano P. Yumul Jr. ,&nbsp;Jonny Wu ,&nbsp;Guangfa Zhong ,&nbsp;Minghui Zhao ,&nbsp;Yi Yan","doi":"10.1016/j.margeo.2025.107613","DOIUrl":"10.1016/j.margeo.2025.107613","url":null,"abstract":"<div><div>Understanding the global water balance between subduction influx and outflux requires exploring for unrecognized sources of water outflux beyond island-arc volcanism. Here we investigate the petrogenesis of the principal high-temperature hydrous mineral (i.e.<em>,</em> amphiboles) in oceanic gabbros of the Huatung Basin, an Early Cretaceous oceanic relict sandwiched between the Gagua Ridge Arc and the Taiwan-Luzon Arc in the northwesternmost corner of the Philippine Sea Plate. The amphiboles show low TiO₂ (&lt;1.5 wt%) and Nb/Yb (≤0.3) and ∼550–800 °C equilibration temperatures using amphibole-plagioclase thermometry, indicating high-temperature metamorphic origins. The low whole-rock ⁸⁷Sr/⁸⁶Sr (703216–0.703294) indicates the fluids involved in the formation of these amphiboles were hydrous island-arc melts. Viewed in conjunction with the large variations of the existed radioisotopic ages (∼130, ∼123–116, ∼105, and ∼70 Ma), the reported seismic velocity structure of the Huatung Basin that implies younger ocean lithosphere ages (20–50 Ma) is likely related to pervasive supra-subduction lithospheric metasomatism of the oceanic lithosphere. This metasomatism was probably hosted by intrusions of Gagua Ridge and Taiwan-Luzon island-arc magmatism. We suggest that such metasomatism of supra-subduction lithosphere by hydrous island-arc melts could be important for water outflux beyond island-arc volcanism globally.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107613"},"PeriodicalIF":2.6,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"14C dating of tsunami deposits in arid environments: How challenging can it be? The example of La Graciosa, Canary Islands","authors":"Raphaël Paris ,&nbsp;Franck Lavigne ,&nbsp;Christine Hatté ,&nbsp;Juan Francisco Betancort ,&nbsp;Jean-Pierre Flandrois ,&nbsp;Arnauld Vinçon-Laugier ,&nbsp;Eve Poulallion ,&nbsp;Simon Falvard ,&nbsp;Bachtiar W. Mutaqin ,&nbsp;Christophe Lécuyer","doi":"10.1016/j.margeo.2025.107607","DOIUrl":"10.1016/j.margeo.2025.107607","url":null,"abstract":"<div><div>¹⁴C dating of tsunami deposits in arid environments is often challenging, especially when there is no organic material available. The marine bioclasts found in the tsunami deposits thus become the main dating possibility. Apart from the reservoir effect, the main source of uncertainty is the age difference between the shells and the tsunami that transported them. Taking as an example a tsunami deposit on the island of La Graciosa (Canary Islands), we demonstrate that the marine shells (<em>Patella</em>) come from different sources, with ¹⁴C ages ranging from &gt;45 kBP to 200 BP, the main source being an ancient marine terrace probably of MIS5e age. In addition, we propose a landslide source for this tsunami, the scar of which can be observed on the Famara cliff to the northeast of Lanzarote, just opposite the tsunami deposit outcrops at La Graciosa. In addition to the methodological aspects of shell dating, this study also serves as a reminder that local tsunamis generated by coastal cliff collapses are not a hazard to be neglected.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107607"},"PeriodicalIF":2.6,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144490026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}