Marine Geology最新文献

{"title":"Recent mass transport deposits in the Gulf of Cagliari","authors":"Maria Cristina Caradonna ,&nbsp;Anna Del Ben ,&nbsp;Gian Andrea Pini ,&nbsp;Riccardo Geletti ,&nbsp;Veronica Frisicchio","doi":"10.1016/j.margeo.2025.107515","DOIUrl":"10.1016/j.margeo.2025.107515","url":null,"abstract":"<div><div>Sedimentary deposits due to slope failures and submarine landslides are common on continental margins. The availability of five new high resolution 2D multi-channel seismic profiles, integrated by Multibeam data, provides unprecedented insight into the shallow submarine geomorphology of the Gulf of Cagliari. The study area, located in the southern Sardinia offshore, exhibits several Mass Transport Deposits (MTDs) during the Upper Quaternary. They move from the continental slope and the north-east flank of the Banghittu High.</div><div>We identified the recent 26 km long MTD-CG1, of which we interpreted the translational domain, characterized by weak deformation, and the toe domain, with a predominantly compressional and erosional regime. This erosion is produced locally by the basal shear zone (bsz) which represents the detachment surface of the slide. Both MTD domains are crossed by vertical conduits and fluid migration that produce buried pockmarks. In the translational domain an underlying carbonate buildup offered greater strength to sliding, resulting in an undisturbed sector. The MTD-CG1 is composed of Middle-Upper Pleistocene sediments which, during the Holocene, assumed an initial direction towards SE, to become towards the SW in the Carbonara Valley. After the gliding, the MTD was cut by the last incision phase of the canyon system which markedly characterizes the physiography of the gulf.</div><div>The MTD-CG1 is primarily predisposed to instability by its steep slope gradient and fluid presence, while possible triggers include eustatic sea level changes and seismic activity.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"483 ","pages":"Article 107515"},"PeriodicalIF":2.6,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474744","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":"Fluxes and processes responsible for elevated Ba in pore-water of the south-eastern Mediterranean shelf","authors":"Mohd Danish ,&nbsp;Uri Ryb ,&nbsp;Gilli Edvardson ,&nbsp;Daniel Freedberg ,&nbsp;Eyal Wurgaft","doi":"10.1016/j.margeo.2025.107511","DOIUrl":"10.1016/j.margeo.2025.107511","url":null,"abstract":"<div><div>Diffusive chemical fluxes from shelf sediments, termed as benthic fluxes, play a key role in the oceanic inventory of chemical elements. However, there are still major gaps in our knowledge of such fluxes for some elements, which leads to increased uncertainty in their modern-day marine budget. Ba is an important tracer for various oceanic processes, but the role of benthic fluxes in its marine budget is poorly constrained. Here, we focus on understanding the processes responsible for elevated Ba in the pore-water of south-eastern Mediterranean shelf sediments; and quantifying the benthic fluxes in this region. We cored shallow sediments from two sites (SG1 and PC3), extracted pore-water samples along depth-profiles, and analysed their composition (Ba, Ca, Mg, Sr, Fe, Mn, Cl, SO₄ and Total Alkalinity (TA)). The concentration of Cl remains conservative in both profiles. At site SG1, dissolved Ca, Sr, and SO₄ concentrations decrease with depth, while those of Ba, Fe, and Mn are enriched relative to seawater. At site PC3, dissolved concentrations of Ca, Sr, and SO₄ show limited variations with depth relative to bottom seawater, but elevated concentrations of Ba, Fe, and Mn. At both sites, Mg shows removal and gain in the pore-water profile. Saturation index calculations indicate that pore-water supersaturated with respect to barite and calcite, while aragonite is undersaturated, suggesting that aragonite dissolution is a potential source of Ba in the pore-water. Additional potential source of Ba includes organic matter remineralization and dissolution of Fe<img>Mn (oxyhydr)oxides. We use Fick's first law to calculate the benthic Ba fluxes at both sites SG1 and PC3 and estimate them at 693 μmol m⁻² yr⁻¹ and 792 μmol m⁻² yr⁻¹, respectively. Integrating the average of these fluxes over the entire basin of the eastern Mediterranean Sea, results in a benthic Ba flux of 2.4 ± 0.2 × 10⁸ mol yr⁻¹. Considering this result together with estimations of riverine, submarine groundwater discharge (SGD) and aeolian inputs to the eastern Mediterranean, we calculate a total Ba input to eastern Mediterranean of 3.9 × 10⁸ mol yr⁻¹. This calculated total flux is comparable to the Ba output to the western Mediterranean Sea estimated at the Sicily Strait (3.5 × 10⁸ ± 1.1 × 10⁸ mol yr⁻¹). While further investigations that include additional sites in the eastern Mediterranean basin are necessary to test and improve this assessment, within order of magnitude these results underscore the significance of the benthic Ba fluxes as key-player in regional and global budget of marine Ba.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"482 ","pages":"Article 107511"},"PeriodicalIF":2.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455056","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":"Signature of off-axis hydrothermal sulfide mineralization at 23.19°S of Central Indian Ridge: Insights from mineralogy, geochemistry, geochronology and near-seabed AUV survey","authors":"Koushick Sen ,&nbsp;P. John Kurian ,&nbsp;Parijat Roy ,&nbsp;Sunil Vadakkepuliyambatta ,&nbsp;Georgy Cherkashov ,&nbsp;L. Surya Prakash ,&nbsp;Katherine Kuksa ,&nbsp;Vladislav Kuznetsov ,&nbsp;Anna Firstova ,&nbsp;Abhishek Tyagi ,&nbsp;Deepak K. Agarwal ,&nbsp;Fedor Maksimov","doi":"10.1016/j.margeo.2025.107500","DOIUrl":"10.1016/j.margeo.2025.107500","url":null,"abstract":"<div><div>Seafloor hydrothermal systems and associated sulfide mineralization have been reported along all types of mid-oceanic spreading ridges, island arcs, and back-arc settings. This study reports the occurrence of a distal ridge (∼35 km off-axis) hydrothermal mineralization zone from the slow-spreading Central Indian Ridge (23.19°S) of the Indian Ocean. The hydrothermal precipitates were recovered during dredging operations and mainly comprised of massive sulfides, sulfide breccias, and their secondary oxidized alteration products. The mineralogical quantification of pyrites (significant Cu enrichment, a strong negative correlation with Fe), and bulk sulfide geochemistry (concentrations and ratio of Ba, Co, and Pb) hint at a possible mixed type of mafic-ultramafic host-rock influence in the formation of sulfides. The ²³⁰Th/U chronological estimations of pyrites from massive sulfide and sulfide breccia suggest a wide range of hydrothermal activity from 144 ± 11 to 52 ± 7 ka. The AUV-assisted near sea floor sub-bottom profiling (SBP) and High-resolution Interferometric Synthetic Aperture Sonar (HISAS) images suggest that the study area is covered by thin layers of sediments with occasional exposure of hard rock outcrops. The reporting mineralization site stands out to be the most distant and one of the chronologically oldest hydrothermal mineralization zones within the Indian Ocean. The study provides insights into the broader geological processes at off-axis locations concerning the hydrothermal mineralization at slow-spreading ridges and indicates the possibility that such undiscovered buried hydrothermal fields may exist located far from the present-day ridge axis.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"482 ","pages":"Article 107500"},"PeriodicalIF":2.6,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143429607","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":"Paleoceanographic evolution of the Chukchi Sea over the past 7600 years inferred from diatom assemblages","authors":"Tong Li ,&nbsp;Yanguang Liu ,&nbsp;Longbin Sha ,&nbsp;Tengfei Song ,&nbsp;Xinyi Wang ,&nbsp;Bin Wu ,&nbsp;Jianghu Lan ,&nbsp;Dongling Li","doi":"10.1016/j.margeo.2025.107502","DOIUrl":"10.1016/j.margeo.2025.107502","url":null,"abstract":"<div><div>The Chukchi Sea plays a critical role in Arctic–Pacific interactions and is currently undergoing a significant retreat of sea ice due to ongoing warming. We present records of diatom assemblages and biogenic silica from a sediment core collected in the central Chukchi Sea, which provides insights into the long-term dynamics of sea ice and Pacific water inflow (PWI) during the middle to late Holocene. Our diatom-based reconstruction of sea ice conditions reveals a long-term declining trend at 7.6–1.3 cal ka BP, coinciding with fluctuating increases in productivity. These changes were likely driven by variations in the warm, nutrient-rich PWI, which is modulated by sea level and atmospheric circulation. Following the establishment of stable sea levels in the middle Holocene, PWI variability appears to have been influenced primarily by the Pacific Decadal Oscillation (PDO) pattern and the strength and position of the Aleutian Low (AL). Notably, the sea-ice records from the central Chukchi Sea align with those from the eastern region, but they contrast with records from northern areas during the late Holocene. This asynchronous pattern of sea-ice development across regions may reflect differences in circulation patterns, such as variations in the strength of PWI branches and significant shifts in Pacific Ocean-atmosphere dynamics. Our findings contribute to a better understanding the links between atmospheric and oceanic processes in the Arctic-Pacific region during the middle to late Holocene.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"482 ","pages":"Article 107502"},"PeriodicalIF":2.6,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419091","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":"Intact Pacific oceanic crust captured as mafic xenoliths in a petit-spot volcano","authors":"Kazuto Mikuni ,&nbsp;Naoto Hirano ,&nbsp;Shiki Machida ,&nbsp;Norikatsu Akizawa ,&nbsp;Shigekazu Yoneda ,&nbsp;Akihiro Tamura ,&nbsp;Tomoyuki Mizukami ,&nbsp;Yasuhiro Kato ,&nbsp;Tomoaki Morishita","doi":"10.1016/j.margeo.2025.107497","DOIUrl":"10.1016/j.margeo.2025.107497","url":null,"abstract":"<div><div>Researchers have gained insights into the lithology and geochemistry of oceanic crust through the investigation of mid-ocean ridge basalts (MORBs), rocks exposed along the spreading ridges (e.g., East Pacific Rise), ophiolites, and samples retrieval through seafloor drilling. However, obtaining samples of old and deep oceanic crust, particularly formed at fast spreading ridges, remains challenging in ocean basins. Much of what we know about the matured oceanic crust comes from studies of ophiolite sequences, whose origins are often uncertain.</div><div>This study investigates the whole-rock and mineral chemistry, Sr–Nd–Pb isotopic ratios, and petrography of basaltic, doleritic, and gabbroic xenoliths in a petit-spot volcano on the northwestern Pacific Plate in order to characterize the deeper lithologies of in situ old oceanic crust which have not been confirmed. The major-element compositions of mafic xenoliths were non alkaline and generally align with the global MORBs. Their entirely N-MORB-like trace-element-patterns and the radiogenic isotopic ratios, aligning with the Pacific MORB and drilled uppermost basaltic crusts in the vicinity of the study area, indicate that these mafic xenoliths are fragments of oceanic crust formed at the fast-spreading Izanagi–Pacific Ridge at 130–140 Ma unrelated to petit-spot volcanism. The apparent correlation between grain size and chemical composition may reflect the lithological variation within oceanic crust owing to crystal fractionation and replenishment at the MOR. The presence of “granoblastic” dolerite supports that the contact metamorphism of lower sheeted dikes due to melt lenses is a ubiquitous phenomenon beneath the fast-spreading ridge axis. While quantitative extraction of the original depth information for these mafic xenoliths is challenging, these results substantiate the hypothesis on the Penrose-type lithostratigraphy of the oceanic crust formed at fast-spreading ridge and its relationship with chemical composition, established through studies in limited areas, even in old oceanic crust that had never been examined before.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"483 ","pages":"Article 107497"},"PeriodicalIF":2.6,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479362","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":"Clinoform architecture influenced by salt tectonics and Quaternary Sea level changes: The Acheloos delta complex, Gulf of Patras, Greece","authors":"Aikaterini Stathopoulou ,&nbsp;George Papatheodorou ,&nbsp;Efthymios Tripsanas ,&nbsp;Aurelia Ferrari ,&nbsp;Romain Rubi ,&nbsp;Maria Geraga ,&nbsp;Sotirios Kokkalas ,&nbsp;Aristofanis Stefatos","doi":"10.1016/j.margeo.2025.107494","DOIUrl":"10.1016/j.margeo.2025.107494","url":null,"abstract":"<div><div>This study focuses on the evolution of the Acheloos river-dominated delta in western Greece. It is an area with limited published data, that serves as a link between the well-studied rift basin of the Gulf of Corinth and the active Kephalonia Transform Fault. The examination of a newly acquired 3D seismic cube and vintage well data in this area offers a rare opportunity to: i) develop a stratigraphic scheme for the evolution of river-dominated deltas in restricted basins influenced by salt tectonics, which can be applied as an analogue to similar deltas worldwide, and ii) re-evaluate the deformation style of the study area and challenge the widely accepted concept of its tectonic behavior as a rigid block.</div><div>Detailed 3D seismic stratigraphy and well data revealed eleven progradational packages. These are attributed to the Acheloos activity during Pleistocene and exhibit distinctive spatial variation. Thickness distribution and trajectory analysis show that the delta developed in three stages: (i) poorly developed progradational units in a weakly subsiding basin, (ii) retrogradational delta units in a strongly subsiding basin and (iii) stabilization of the accommodation space and gradual basin infill through progradational units.</div><div>Although the study area has been considered a rigid block, stratigraphic analysis revealed multiple subsidence events linked to the structural history of the basin. Additionally, seismic data reveal that salt tectonics have a significant impact on its evolution, affecting the locus of the depocenters and the subsidence rates. The deformation of the underlying strata shows that the salt diapiric activity intensified from 435 ka to present. This can either be attributed to the differential loading due to the continuous deltaic sedimentation and/or to the structural activity within the study area. Notably, the paroxysmal phase of salt tectonics occurs right after a large subsidence of the area of interest between 860 and 550 ka.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"482 ","pages":"Article 107494"},"PeriodicalIF":2.6,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143419090","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":"Marginal marine spring carbonates defining an emergent rocky shoreline at Cape Freycinet, Western Australia","authors":"Thomas W. Garner ,&nbsp;J. Andrew G. Cooper ,&nbsp;Alan Smith","doi":"10.1016/j.margeo.2025.107496","DOIUrl":"10.1016/j.margeo.2025.107496","url":null,"abstract":"<div><div>Modern and Holocene tufa microbialites have been documented globally on groundwater spring-fed supratidal rock coasts. Here, we document the first emergent facies assemblage and demonstrate its utility as a palaeo-shoreline (and sea-level) indicator. At Cape Freycinet, Western Australia, discrete palaeo-spring-associated deposits comprise five distinct facies that collectively define a Quaternary shoreline on a granitic rock coast similar to the contemporary coast. A palaeosol facies, passes laterally seaward into tufa microbialite on sub-horizontal bedrock, associated with oncoids. The most seaward facies is a microbially-cemented sand representing deposition in the upper-intertidal to supratidal zone of a sandy embayed beach, flanked by prominent headlands. A tufa-lithoclast breccia indicates occasional high-energy events. Facies distributions are controlled by bedrock topography in relation to palaeo-sea-level and the distinct suite of marginal marine, springline-associated facies define a Quaternary palaeo-shoreline at ca. +13 m above sea-level. The approach demonstrates the utility of marginal marine microbialite and related carbonate deposits as indicators of Quaternary sea-level on rock coasts.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107496"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143262129","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":"Initiation and internal structure of temperate coral reef community over the past 7.3 kyr in Kushimoto, mainland of Japan","authors":"Chuki Hongo ,&nbsp;Ryuji Asami ,&nbsp;Hiroya Yamano","doi":"10.1016/j.margeo.2025.107499","DOIUrl":"10.1016/j.margeo.2025.107499","url":null,"abstract":"<div><div>The initiation timing and formation process of coral community in areas where coral reefs have not developed beyond 30°N are still unclear. We conducted underwater drilling of carbonate rocks to the bedrock in Kushimoto area (33.45°N, 135.75°E), Wakayama Prefecture, located on the Pacific side of mainland of Japan, and first discovered that the initiation of coral community formation in this area dates back to 7.3 ka (7487–7210 cal. yr BP, within 2σ range). This onset could be because of the warming resulting from the Kuroshio warm current approaching the Pacific side of mainland of Japan around 10–7 ka. Interestingly, we found that this period aligns closely with the onset of coral reef formation in subtropical regions of the northwestern Pacific. While Acroporidae is the primary builders of coral reefs in tropical to subtropical regions, the coral communities in Kushimoto area were formed predominantly by domal Merulinidae (<em>Cyphastrea</em>, <em>Favites</em>, and <em>Dipsastraea</em>), representing a single facies formed in low wave energy conditions at depths of approximately 10–20 m. The facies formed by domal corals persisted from 7.3 ka to 3.7 ka, whereas the current dominant coral community is composed of <em>Acropora</em>. However, it remains unclear when this <em>Acropora</em> community began and whether there was a hiatus between 3.7 ka (3849–3525 cal. yr BP, within 2σ range) and the present. The study area has lower SSTs compared to tropical and subtropical regions, which reduces the precipitation of calcium carbonate, hindering the upward growth of corals. Additionally, the relatively smooth rocky substrate of the study area suggests that even if coral communities were to form mounds and reach near the sea surface, they would likely be dislodged by high waves due to the open-ocean environment. As a result, although corals have been inhabiting the area since 7.3 ka, the coral reef remains underdeveloped.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107499"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143379160","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":"Carbonate sediment dynamics in oceanic atoll lagoons of Lakshadweep Archipelago","authors":"Shradha Menon,&nbsp;Pankaj Khanna,&nbsp;Saikat Kumar Misra","doi":"10.1016/j.margeo.2025.107498","DOIUrl":"10.1016/j.margeo.2025.107498","url":null,"abstract":"<div><div>Atoll lagoons grow by constant sediment supply and are increasingly being affected by climate change. The impacts are non-uniform; thus, understanding the mechanisms governing the sediment dynamics is crucial to assessing atoll island stability. Satellite geomorphological and sedimentological studies have been conducted on Agatti and Kavaratti atolls in the Lakshadweep Archipelago (Northern Indian Ocean) to discern factors governing sediment dynamics. These lagoons, with maximum depths of 4 m, are grainstone-dominated (79 % - Agatti &amp; 96 % - Kavaratti). Sand-sized fractions (2–0.125 mm) constitute approx. 87 % and 90 % of the Agatti and Kavaratti lagoon, respectively. The major sediment producers include corals (34–57 % - Agatti; 37–58 % Kavaratti) and molluscs (31–34 % - Agatti; 32–39 % - Kavaratti) followed by forams (8–20 % - Agatti; 2–13 % - Kavaratti), algae (2–7 % - Agatti; 2–10 % - Kavaratti) and <em>Halimeda</em> (1–6 % - Agatti; 1–10 % - Kavaratti); within each sample fraction. Coral clasts and molluscs are prevalent near the north, and algae (including <em>Halimeda</em>) is abundant in the south in Agatti. In Kavaratti, molluscs and algae, and <em>Halimeda</em> are prevalent in the north (near the dredging channel) compared to coral clasts. For both atolls, forams are confined to the south and in the lagoon's interior. Generally, for both atolls, coral clasts and algae (including <em>Halimeda</em>) decrease from the reef flat to the island, while molluscs show opposite trends. Reef flats, patch reefs and seagrass patches serve as significant production zones. Anthropogenic factors (dredging) have altered ocean parameters, evidenced by an increase in algae and molluscs and a decrease in coral clasts. The wave-induced currents dictate sediment redistribution, with lighter components such as molluscs and coral clasts transported across the lagoon, while sheltered zones retain particular components such as forams. The small size of the atolls, shallow bathymetry and sand-sized sediments imply potential bucket fill. As climate change progresses, intensified wave-induced currents (linked to stronger monsoons) will result in the retention of coarse-grained sand, with these components dictating future sediment supply. Coupled with rising coral mortality, molluscs would become dominant, affecting sediment production; leading to land loss. The study underscores the importance of local factors such as geomorphic zones and hydrodynamics in discerning island stability in terms of climate change.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107498"},"PeriodicalIF":2.6,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372415","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":"Impact of Storm Pabuk on a Monsoon Coral Beach: Bidong Island, Terengganu (Malaysia)","authors":"Siti Nur Hanani Zainuddin ,&nbsp;Che Din Mohd Safuan ,&nbsp;Junainah Zakaria ,&nbsp;Cherdvong Saengsupavanich ,&nbsp;Muhammad Zahir Ramli ,&nbsp;Azizi Ali ,&nbsp;Zainudin Bachok ,&nbsp;Fatihah Shariful ,&nbsp;Alya Syakirah Tajul Ariffin ,&nbsp;Idham Khalil ,&nbsp;Aidy M. Muslim ,&nbsp;Hasrizal Shaari ,&nbsp;Baharim Mustapa ,&nbsp;Nor Aslinda Awang ,&nbsp;Mohd Fadzil Akhir ,&nbsp;Ikha Magdalena ,&nbsp;Effi Helmy Ariffin","doi":"10.1016/j.margeo.2025.107495","DOIUrl":"10.1016/j.margeo.2025.107495","url":null,"abstract":"<div><div>Monsoon-influenced coasts commonly exhibit a clear seasonal pattern that may be undergoing variability associated with increased storm activity. A notable example is a rare tropical cyclone event in Malaysian waters in January 2019 that affected both marine and terrestrial environments in an exceptional context that diverged from seasonal Monsoon-influenced coastal geomorphic responses to waves. Storm Pabuk made landfall in the South China Sea, with its tail impacting Bidong Island, a coral reef island in Terengganu, Malaysia. Using data on coral coverage cover, aerial imagery obtained from an unmanned aerial vehicle (UAV) and numerical simulations of waves, this study investigates the shoreline changes caused by the cyclone, focusing on coral distribution and wave parameter modeling. The results reveal, unsurprisingly, that the coral reef beach was negatively affected, with a significant reduction in live coral cover. Interestingly, however, the shoreline saw an increase in beach sediment accumulation as well as shoreline length, highlighting both the negative erosion impacts of storms on corals but also their tendency to liberate new beach sediment. The effects of Storm Pabuk illustrate the importance of considering exceptional events in the study of Monsoon-influenced beach dynamics, especially in settings characterized by corals.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107495"},"PeriodicalIF":2.6,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372416","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}