Marine Geology最新文献

{"title":"Comment on Investigating the origin and dynamics of Carolina Bays by Mark Lundine and Arthur Trembanis [Marine Geology 480 (2025)]","authors":"Michael Ernest Davias,&nbsp;Thomas H.S. Harris","doi":"10.1016/j.margeo.2025.107556","DOIUrl":"10.1016/j.margeo.2025.107556","url":null,"abstract":"<div><div>The paper entitled Investigating the origin and dynamics of Carolina Bays by Mark Lundine and Arthur Trembanis, published in Marine Geology 480 [(2025) 107449] addresses the geomorphology of a collection of closed ovoid basins located on the Atlantic Coastal Plain of the USA. While we respect the excellent quality of the effort by Lundine and Trembanis on this topic, we offer a comment on their review of the runnable mental model presented in Davias and Harris (2022), and the companion paper Harris (2022). While there are several aspects of their review that we accept as debatable, central tenets of our hypothesis were overlooked. Primarily, Lundine and Trembanis (2025) entirely misrepresents our proposal as one which utilizes a mechanism of excavation of these shallow basins by secondary impacts into preexisting unconsolidated sediment. As clearly noted in the title, abstract and text of Davias and Harris (2022) we relate an interdisciplinary hypothesis that the basins were created within that sedimentary deposit during the catastrophic deposition of that sediment and manifested as cavitation artifacts at the surface. Our paper suggests a straightforward task to falsify: constrain the deposition date, method and source of the expansive conformal blanket we describe. Rather than being “thin ephemeral landforms” these basins should be viewed as robust structures, expressing to the surface and visible in our repository of LiDAR imagery despite having entire cities built across them. The lack of a prominent impact crater within the Great Lakes region of the USA is also addressed briefly here, as Lundine and Trembanis (2025) raised an objection. Among our supporting argument for such an impact is data from suborbital modeling of the Australasian tektites, combined with a tool kit for public use in Harris (2022).</div><div>The extensive runnable mental model of Davias and Harris (2025) address many of the concerns raised in Lundine and Trembanis (2025). We make no attempt here to defend the full interdisciplinary hypothesis as presented in the 30 pages of Davias and Harris (2022).</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107556"},"PeriodicalIF":2.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143843370","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":"Sedimentation dynamics on the Maldives carbonate platform in response to Quaternary monsoonal forcing and sea-level changes","authors":"Andreas Paul ,&nbsp;Gatsby-Emperatriz López-Otálvaro ,&nbsp;John J.G. Reijmer","doi":"10.1016/j.margeo.2025.107561","DOIUrl":"10.1016/j.margeo.2025.107561","url":null,"abstract":"&lt;div&gt;&lt;div&gt;Based on the sedimentological, geochemical and mineralogical analysis of two piston cores recovered from the Maldives, an isolated carbonate platform situated in the northern Indian Ocean, this study aims at unravelling the complex Quaternary glacial-interglacial variability within peri-platform ooze deposited in the Inner Sea sedimentary basin, compare sedimentation dynamics between proximal and distal basin locations, and develop a conceptual model, which characterises the interplay between highstand shedding, early diagenesis, water circulation and oceanic current amplification in response to sea level changes and the monsoon.&lt;/div&gt;&lt;div&gt;The results of this study show that at the proximal location, a pattern of re-sedimentation occurred over the last 280 ky, marked by the development of hiatuses during MIS 7 and partially during MIS4–2. Distally, a continuous sedimentation record was present covering the full glacial – interglacial cyclicity, including sediment production and export, over the same time interval.&lt;/div&gt;&lt;div&gt;The processes that may be associated with the abovementioned sedimentary evidence include strong forcing of monsoonal oceanic currents on sediment production and export, commonly referred to as highstand shedding, and on sediment distribution pathways, during Quaternary glacial and interglacial periods. This sediment distribution process includes forcing by oceanic water masses through narrow inter-atoll channels, also bathing the reef bodies on Ari atoll, and the off-bank transport of shallow-water skeletal and non-skeletal material towards the Inner Sea during interglacial periods.&lt;/div&gt;&lt;div&gt;Contrastingly, during glacial intervals, the major atolls were exposed, and oceanic currents associated with the summer monsoon were forced solely through the inter-atoll channels. As the water masses associated with these currents moved through a channel they were amplified, which in turn increased their capacity for erosion and bedload/suspension transport. This led either to the formation of sedimentary gaps or sedimentary hiatuses, but also of sediment drift bodies that moved large sediment masses back and forth along the channel axis. It is likely that these drift bodies switched direction between the summer and winter monsoon season and/or between periods of stronger summer monsoon and stronger winter monsoon throughout the middle and upper Pleistocene and the Holocene, which lead to the observed variations in sedimentation dynamics between the proximal and distal site.&lt;/div&gt;&lt;div&gt;As part of the study, a custom Dynamic Time Warping (DTW) algorithm was developed. Application of this methodology to a reference core showed that it quickly established an age model for a particular core, picking up glacial-interglacial variability and maximum age ranges very well. However, the methodology falls short of completely deciphering the complex sedimentary records as the proximal core discussed here exhibits a sedimentary sequence whi","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107561"},"PeriodicalIF":2.6,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833597","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":"Hydrodynamic processes and extreme events recognized from the sedimentary records at ancient Port Shuomen in the Oujiang River mouth, Southeast China","authors":"Xin Wei ,&nbsp;Yanhua Liang ,&nbsp;Tuanhui Liu ,&nbsp;Zhihang Ma ,&nbsp;Xiaolin Ma ,&nbsp;Shiyu Ji ,&nbsp;Fangyou Lin ,&nbsp;Hao Xu ,&nbsp;Zhanghua Wang (王张华)","doi":"10.1016/j.margeo.2025.107562","DOIUrl":"10.1016/j.margeo.2025.107562","url":null,"abstract":"<div><div>Identifying extreme events from geological records is fundamental to Paleotempestology. Archaeological excavations at the ancient Port Shuomen on the Southeast Chinese coast have provided high-resolution stratigraphic data for recognizing deposits associated with extreme events. This study examined three profiles from the Port and surficial sediments from modern colluvial and estuarine environments in the lower Oujiang River basin. Analyses including chronology, sedimentology, alkaline earth metal geochemistry, and ancient environmental DNA (eDNA) were performed on the sedimentary records to identify hydrodynamic processes and extreme events during the Song Dynasty (960–1279 CE). Comparisons of alkaline earth metal compositions between the profiles and surficial sediments suggest a reduction in salinity at the Port Shuomen, driven by increased freshwater discharge during the mid- to late-Northern Song Dynasty. High eDNA concentrations and consistent frequency distributions of fragment lengths further suggest rapid channel siltation during a single typhoon season. Following this typhoon season, the Port evolved into tide-dominated regime and experienced five periods of flooding, three of which were characterized by intensified salinity intrusion as evidenced by elevated Sr content. In particular, a mud unit (U10) exhibits the highest Sr content and is interpreted as a depositional record of extreme typhoon events that occurred in the 1160s CE. Furthermore, this study demonstrates that in estuarine environments, the preservation of eDNA is more impacted by sedimentary processes than grain size.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"486 ","pages":"Article 107562"},"PeriodicalIF":2.6,"publicationDate":"2025-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143851841","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":"Coastal hydrodynamics at the sub-Antarctic Possession Island (Crozet archipelago) inferred from bedform structures and sediment properties","authors":"Yann Lelièvre ,&nbsp;Guillaume Lawnizack ,&nbsp;Nadia K. Ayoub ,&nbsp;Francesco d'Ovidio ,&nbsp;Éric Armynot du Châtelet ,&nbsp;Mario Zampolli ,&nbsp;Georgios Haralabus ,&nbsp;Lucie Courcot ,&nbsp;Pierre-Yves Collin ,&nbsp;Thomas Saucède","doi":"10.1016/j.margeo.2025.107559","DOIUrl":"10.1016/j.margeo.2025.107559","url":null,"abstract":"<div><div>Within the Southern Ocean, sub-Antarctic regions are anticipated to face significant impacts related to climate change. The alteration of the circulation and properties of the water masses is expected to have widespread impacts on sub-Antarctic nearshore marine ecosystems. Satellite data provides valuable insights into the global ocean circulation but information on fine-scale, local coastal dynamics remain limited and imprecise for the isolated sub-Antarctic territories. The present study aims to infer coastal hydrodynamic processes from the analysis of bedforms using seafloor imagery and sediment samples at two sites located on the eastern coast of <em>Ile de la Possession</em> (Crozet archipelago), <em>Baie du Marin</em> and <em>Crique du Sphinx</em>. Sedimentological and mineralogical analyses conducted on samples have revealed a typical volcanic nature of sediments, with a high proportion of pyroxenes, olivines and large plagioclases. Sediments were characterized by low carbonate and nitrogen contents, suggesting that organic matter is either rapidly depleted by microbial degradation, consumed by benthic detritus feeders, or the lithogenic material transported away from the coastal production area by local currents. Sedimentary structures analyses suggested that ocean circulation at <em>Baie du Marin</em> and <em>Crique du Sphinx</em> is influenced by residual flows that are likely driven by wind and ocean circulation at regional scales and that may result as well from tidal rectification by topography between <em>Ile de la Possession</em> and <em>Ile de l'Est</em>. This study provides a first attempt to analyze local, fine-scale hydrodynamic processes occurring along the eastern coast of <em>Ile de la Possession</em> and link these field observations to large-scale, regional processes formerly studied in the region.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107559"},"PeriodicalIF":2.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143825440","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 morphology and geochemistry of authigenic pyrite formed under methane seepage: Insights from the Laptev Sea","authors":"Alexey Ruban ,&nbsp;Anastasia Nikolaeva ,&nbsp;Vera Abramova ,&nbsp;Alexander Ignatiev ,&nbsp;Oleg Dudarev ,&nbsp;Igor Semiletov ,&nbsp;Maxim Rudmin","doi":"10.1016/j.margeo.2025.107558","DOIUrl":"10.1016/j.margeo.2025.107558","url":null,"abstract":"<div><div>In cold seep environments, intense sulfate-driven anaerobic oxidation of methane (SD-AOM) generates significant amounts of hydrogen sulfide, facilitating pyrite precipitation in the sulfate-methane transition zone (SMTZ). To enhance the understanding of pyrite formation processes within the SMTZ, we analyzed the morphology, size distribution, trace element content, and sulfur isotopic composition of framboidal pyrite hosted in methane-derived authigenic carbonate crusts. These crusts were collected from two active cold seep sites in the Laptev Sea: the outer shelf and the continental slope. The main textural forms of authigenic pyrite were found to include spherical and polygonal framboids and their clusters, sunflowers, and rod-like aggregates. The diameter of most measured framboids does not exceed 20 μm, but some reach up to 74 μm. Despite the small size, their association with methane-derived authigenic carbonates indicates that SD-AOM plays a dominant role in pyrite precipitation. Specific pyrite textures, such as rod-like aggregates, and the large size of certain framboids further support that pyrite formation occurred within the SMTZ. Different textural relationships between pyrite aggregates and carbonate cement reflect both pre‑carbonate and post‑carbonate pyrite precipitation. Their coexistence within a single carbonate crust sample suggests multiple episodes of pyrite formation. The obtained δ³⁴S values for pyrite (ranging from −35.6 ‰ to −28.1 ‰ V-CDT) reveal a depletion of heavy sulfur isotopes at both sites, which is uncharacteristic of SD-AOM-associated pyrite. This phenomenon is likely attributed to the open-system conditions of pyrite formation, which result from the shallow SMTZ. The content of some trace elements in pyrite from the outer shelf is significantly lower than that in pyrite from the continental slope. This difference in trace element composition may reflect varying conditions under which pyrite precipitated, highlighting the influence of fluid migration regimes on mineral-forming processes. Lower Co/Ni ratios in pyrite from the continental slope indicate its formation under more sulfidic conditions. Our findings suggest that the depth of the SMTZ relative to the seawater-sediment interface is a critical factor controlling the morphological, isotopic, and trace element characteristics of pyrite, which should be taken into account when identifying paleo-seepage.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107558"},"PeriodicalIF":2.6,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143820656","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":"Comment on investigating the origin and dynamics of Carolina Bays by Mark Lundine and Arthur Trembanis [Marine Geology 480 (2025)] Reply","authors":"Mark Lundine,&nbsp;Arthur Trembanis","doi":"10.1016/j.margeo.2025.107557","DOIUrl":"10.1016/j.margeo.2025.107557","url":null,"abstract":"<div><div>We thank the authors for their interest in our recent study as well as encourage continued scientific discourse and debate. However, the geological evidence, of which was thoroughly presented in the original paper, remains in support of a gradualistic, terrestrial formation mechanism for Carolina Bays. Further investigations into tangible, empirical evidence related to Carolina Bays and other similar geomorphic features are encouraged, while entertaining alternative hypotheses not grounded in geologic principles and techniques, nor based upon available data remains as speculation. Again, we welcome recognition, criticism, discussion, and further thought upon the evidence presented in our original paper, but we find continued speculation on hypotheses that remain incompatible with the available empirical evidence to be unproductive.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107557"},"PeriodicalIF":2.6,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143833598","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":"Utilizing optical backscatter sensor and sediment traps for measuring sediment dynamics in low-energy marine environment","authors":"Chin Yik Lin ,&nbsp;Su Shiung Lam ,&nbsp;Jenn Wei Er ,&nbsp;Wah Sze Lee ,&nbsp;Jia Hui Ang","doi":"10.1016/j.margeo.2025.107555","DOIUrl":"10.1016/j.margeo.2025.107555","url":null,"abstract":"<div><div>This study investigates the application of the SediMeter (SM) for assessing sedimentation and erosion in a low-energy basin, in conjunction with conventional sediment traps (STs) to characterize the vertical sediment profile in a marina at Port Dickson. Despite the widespread use of STs, a significant knowledge gap exists regarding their ability to capture dynamic sediment processes – such as rapid resuspension and short-term fluxes – which the SM is designed to monitor with high temporal resolution. Our results indicate that sediment fluxes in the water column do not directly correlate with water turbidity due to rapidly changing physical forcing conditions. Notably, the SM detected a pronounced layer of high-water-content sediment – attributed to a storm event followed by steady deposition of resuspended material after the event subsided. While the SM data revealed a clear relationship between semi-diurnal tides and variations in both turbidity and sediment flux, the ST recorded a consistent particle settling rate of 16.9 mg cm⁻² day ⁻¹, underscoring a weak correlation between these two measurement techniques. This discrepancy suggests that the SM, which captures both sediment influx and resuspension in real time, cannot serve as a direct surrogate for the ST, which only quantifies net sediment accumulation. Instead, the SM provides high temporal resolution necessary for resolving transient sediment dynamics, whereas the ST offers an integrated assessment of overall sedimentation. Thus, the complementary use of both instruments is essential for addressing the current limitations in sediment monitoring and for achieving a comprehensive understanding of sediment transport processes in dynamic marine environments.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107555"},"PeriodicalIF":2.6,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808133","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":"Deep Secrets: Discovery of a giant mega-slide in the North Sea Fan, offshore Norway","authors":"Rachel Barrett ,&nbsp;Benjamin Bellwald ,&nbsp;Peter J. Talling ,&nbsp;Elisaveta Sokolkova ,&nbsp;Henrik Grob ,&nbsp;Kai-Frederik Lenz ,&nbsp;Arne Lohrberg ,&nbsp;Jens Schneider von Deimling ,&nbsp;Felix Gross ,&nbsp;Sebastian Krastel","doi":"10.1016/j.margeo.2025.107554","DOIUrl":"10.1016/j.margeo.2025.107554","url":null,"abstract":"<div><div>The Mid-Norwegian continental margin is home to multiple submarine landslides of prodigious volume (mega-slides), thought to have occurred once each glacial cycle over the last ∼500 kyr. Here, we present new 2D seismic reflection data that image the headwall of a previously unknown mega-slide buried beneath Quaternary sediment in the North Sea Fan. The deposits linked to this mega-slide, named the Solsikke Slide, have a volume exceeding 15,000 km³. This is five times greater than the neighboring tsunamigenic Holocene Storegga Slide's volume, and makes the Solsikke Slide one of the largest landslides yet discovered on our planet. The Solsikke Slide remobilized deposits from the previous three mega-slides within the North Sea Fan, including the Tampen Slide that is thought to have occurred ca. 120 kyr BP. Together with the overlying deposits, this constrains the timing of the Solsikke Slide to between 120 and 57 kyr BP (MIS 5–3), which indicates that mega-slides may happen more frequently than previously thought along this margin. Furthermore, we identify a network of faults that extend up from the acoustic basement to the base of the Solsikke headwall, and seismic evidence of lateral fluid migration within the underlying unit. These observations suggest seismic shaking and fluid migration, together with sediment loading, likely played an important role in pre-conditioning and/or triggering failure. Our findings thus have significant implications for understanding the hazard posed by mega-slides in the Northern Atlantic, in terms of their frequency, potential magnitude, and pre-conditioning factors.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107554"},"PeriodicalIF":2.6,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808134","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":"In-situ geotechnical properties of abyssal sediments and implications for environmental impacts of polymetallic nodule mining","authors":"Zhenggang Li ,&nbsp;Zhou Li ,&nbsp;James R. Hein ,&nbsp;Yangrui Cheng ,&nbsp;Yuwei Liu ,&nbsp;Shiquan Lin ,&nbsp;Hao Wang ,&nbsp;Xibin Han ,&nbsp;Yanhui Dong ,&nbsp;Fengyou Chu ,&nbsp;Xiaohu Li","doi":"10.1016/j.margeo.2025.107546","DOIUrl":"10.1016/j.margeo.2025.107546","url":null,"abstract":"<div><div>Polymetallic nodules on the global seabed are an enormous resource for critical metals, while environmental impacts caused by mining activities such as sediment disturbance and plume diffusion are under evaluation. Geotechnical properties of surface sediments hosting nodules will critically impact mining operations. However, the spatial variation in geotechnical properties and sediment transport and deposition dynamics are poorly known. We carried out in-situ penetration strength tests at 11 stations in the China Minmetals Contract Area, western Clarion-Clipperton Fracture zone. By establishing a quantitative relationship between sediment penetration strength (indicative of substrate hardness) and the bathymetric position index (BPI, a measure of topographic relief) and sediment grain size, we observed that topographic highs (highlands) exhibit coarser sediments and harder substrates compared to topographic lows (depressions). This observation aligns well with a lateral sediment redistribution model, where sediment is eroded from elevated areas and redeposited in depressions. Our findings suggest that a harder substrate on highlands would lead to reduced mining vehicle subsidence and sediment disturbance, thereby mitigating sediment plumes. Consequently, preferential nodule mining on highlands is likely to yield lower environmental impact and faster ecosystem recovery compared to mining in depressions.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"484 ","pages":"Article 107546"},"PeriodicalIF":2.6,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143706350","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":"Response of phosphorus burial and post-depositional diagenesis to postglacial climate change in the coastal system","authors":"Shuya Huang ,&nbsp;Xia Zhang ,&nbsp;Yanyan Zhao ,&nbsp;Chunming Lin","doi":"10.1016/j.margeo.2025.107545","DOIUrl":"10.1016/j.margeo.2025.107545","url":null,"abstract":"<div><div>The phosphorus (P) burial and diagenesis in coastal systems determine the reactive P flux to the ocean, influencing primary productivity and nutrient element cycles. To understand the fate of P in coastal areas and its association with postglacial climate change, we determined P species, Fe-(oxyhydr)oxides (Fe-oxides), major elements, nutrient elements (C and N), and vivianite minerals characteristics in sediment cores from the Qiantang River (QR) estuary in eastern China. Our findings reveal that the P cycle was predominantly controlled by postglacial sea-level changes in the QR estuarine system. Fe-bound P (P_Fe) dominates in fluvial and paleo-estuarine sediments, comprising ∼79 % of total P pool, which mainly exists in the form of vivianite, particularly enriched below the estuarine-marine transition. This enrichment is linked to increased bottom-water sulfate concentrations and reduced sedimentation rates in response to marine transgression around 8.5 ka BP, promoting the sustained anaerobic oxidation of methane and reductive dissolution of Fe-oxides. In contrast, Ca-associated P (mostly carbonate fluorapatite) formed at the expense of P_Fe and organic P in shallow marine and modern estuarine deposits, acting as a major P sink during high sea-level episodes. The high P_Fe deposition event is linked to a paleo-flood event at the Younger Dryas-Holocene transition. Flood-driven surface sediments oxygenation facilitated the coprecipitation of Fe-oxides and P, notably lowering Fe/P ratio in P_Fe speciation. Our work highlights the long-term impact of postglacial climate change on the coastal P cycle through sea-level fluctuation, environmental perturbation, and abrupt climate events.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"485 ","pages":"Article 107545"},"PeriodicalIF":2.6,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143735124","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}