Marine Geology最新文献

{"title":"Falkland/Malvinas Trough: Indications for Cenozoic tectonic and oceanographic evolution in the southwestern South Atlantic","authors":"B. Najjarifarizhendi,&nbsp;G. Uenzelmann-Neben,&nbsp;J. Gruetzner","doi":"10.1016/j.margeo.2025.107595","DOIUrl":"10.1016/j.margeo.2025.107595","url":null,"abstract":"<div><div>The Falkland/Malvinas Trough (F/MT) bounds the southern extremity of the Falkland/Malvinas Plateau. This Cenozoic bathymetric depression developed as the orogenic foreland basin of the North Scotia Ridge. The sedimentary infill of the F/MT carries a history of development in a transpressional setting along the South American-Scotian Plate boundary, in association with the evolution of the Drake Passage-Scotia Sea zone. Since the F/MT is located on the pathway of the Antarctic Circumpolar Current, the current-controlled depositional and erosional features within its sedimentary infill provide valuable information on the palaeoceanographic modifications in the southwestern South Atlantic. Via a set of 2D high-resolution seismic reflection data, the structural and morphological features of these strata are investigated and discussed with respect to the tectonic evolution of the Drake Passage-Scotia Sea zone. Evidence of fold structures and normal faulting during Oligocene to mid-Miocene times in the study area argue for a transpressional regime linked with the development of the Drake Passage-Scotia Sea zone. The current-related depositional and erosional processes in the F/MT started between Oligocene to early Miocene times. With the full opening of the Drake Passage, the evolution of the Scotia Sea and the demise of the Ancestral South Sandwich Arc by the mid-Miocene, an oceanographic setting analogous to the present would have established. Evidences suggests that since then, with the enhancement of the abyssal circulation subsequent to the perennial Antarctic glaciation, a precursor of the Weddell Sea Deep Water has been circulating the F/MT, shaping a confined sediment drift deposit.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107595"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280056","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 utility of mangrove foraminifera, diatoms, and stable carbon isotope and C/N geochemistry in relative sea-level reconstruction in the Pearl River Delta, China","authors":"Howard K.Y. Yu ,&nbsp;Nicole S. Khan ,&nbsp;Nina Desianti ,&nbsp;Ed Garrett ,&nbsp;Noah J. Planavsky ,&nbsp;Ayesha Ahmed","doi":"10.1016/j.margeo.2025.107610","DOIUrl":"10.1016/j.margeo.2025.107610","url":null,"abstract":"<div><div>We investigated the utility of foraminifera, diatoms, and δ¹³C and C/N geochemistry as proxies for generating late Holocene relative sea-level (RSL) records from Deep Bay on the eastern side of the Pearl River Delta. We described the contemporary distribution of these proxies from 66 samples across subtidal, intertidal (mudflat and mangrove), and upland environments from three transects. Using Partitioning Around Medoids (PAM) cluster analysis, we identified ten distinct, vertically-zoned groups of foraminifera and two groups of diatoms. Canonical Correspondence Analysis (CCA) revealed that tidal elevation was the primary environmental variable controlling foraminiferal assemblages, while salinity, which covaried with elevation, primarily influenced diatom assemblages. We also identified 6 vertically-zoned, environmental zones on the basis of δ¹³C and C/N geochemistry using linear discriminant analysis (LDA). Bayesian transfer functions (BTFs) were developed from modern foraminifera and diatom training sets incorporating priors from geochemically-defined environmental zones and BTF predictions derived from the other microfossil group. These BTFs were applied to a sediment core collected from contemporary mangroves, which began accumulating around 1960 CE. Comparison of our RSL reconstructions with local tide gauge records demonstrated that incorporating informative priors improved the accuracy and precision of RSL reconstructions. Among the approaches tested, microfossil BTF-derived priors yielded greater improvement, producing lower prediction uncertainties compared to those based on geochemical priors. The foraminifera BTF captured all tide gauge observations within its 1σ uncertainty bounds regardless of whether informed by priors, while using diatom BTF priors led to a reduction in Mean Squared Error (MSE) by 121 % (MSE: 0.014 m²), and average 1σ uncertainty by 36 %. The incorporation of foraminifera BTF priors in the diatom BTF did not result in substantial improvements in accuracy but reduced its average 1σ uncertainty by 43 %. Our results demonstrate that foraminifera, diatoms, and δ¹³C and C/N geochemistry together offer robust tools for reconstructing late Holocene RSL in the Pearl River Delta, although their utility in isolation is limited by poor preservation of foraminiferal tests and the influence of planktonic diatom taxa in sediment archives.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107610"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144469881","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":"Sedimentary records of mid-Holocene extreme storm events and Neolithic cultural response in the Yaojiang-Ningbo Plain, East China","authors":"Fangyou Lin ,&nbsp;Shuwen Mei ,&nbsp;Hao Xu ,&nbsp;Maojie Yang ,&nbsp;Michael E. Meadows ,&nbsp;Zhanghua Wang (王张华)","doi":"10.1016/j.margeo.2025.107611","DOIUrl":"10.1016/j.margeo.2025.107611","url":null,"abstract":"<div><div>The Yaojiang-Ningbo coastal plain in East China is naturally vulnerable to salinity intrusion. At around 5.3 ka, the study area experienced a period (the 5.3 ka extreme storm period) when extreme storm events and associated salinity intrusions were especially frequent. Sedimentary records are widely distributed in the plain but have thus far not been systematically amalgamated, constraining interpretation of the impacts of these extreme storms on prehistoric coastal communities. Here we present a multi-proxy analysis of the chronology, sedimentology, and geochemistry of a profile containing records of the 5.3 ka extreme storm period from a newly excavated Neolithic site, Hukengji, in the Yaojiang-Ningbo plain. Results of the paleoenvironmental reconstruction evidences a tidal marsh environment at the site at ca. 6.0 ka, which was exposed to salinity intrusions at ca. 5.3 ka and river flooding at ca. 5.1 ka. Through comparison with other sedimentary records in the region, we show that the 5.3 ka extreme storm period in the Yaojiang-Ningbo Plain extended from ca. 5.4 ka to ca. 4.9 ka, with two peaks at around 5.3 ka and 5.1 ka. Communities of the Hemudu Culture Period IV adapted to this phase of coastal flooding, for example, by constructing artificial mounds. However, the effects of the extreme hydroclimatic events during the 5.3 ka extreme storm period led eventually to the Hemudu Culture being replaced across the region by the more complex and socially stratified Liangzhu Culture from around 5.1 ka onwards.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107611"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516952","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":"2025-10-01","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":"Coral reef boulders as recorders of cyclone activity over the last 3500 years (Fakarava Atoll, Tuamotu, French Polynesia)","authors":"Lucien F. Montaggioni ,&nbsp;Bernard Salvat ,&nbsp;Éric Brunaud ,&nbsp;Edwige Pons-Branchu ,&nbsp;Gilbert Poli ,&nbsp;Bertrand Martin-Garin","doi":"10.1016/j.margeo.2025.107605","DOIUrl":"10.1016/j.margeo.2025.107605","url":null,"abstract":"<div><div>Extreme marine hazard events are expected to increase in the next future as a response to global warming. Estimating their frequency and magnitude in the recent past is of prime concern to better project their future impacts. In tropical reef provinces, coral boulders deposited on reef top surfaces can be used as key proxies for defining the occurrence – recurrence time and effects of paleo-storms. The present study defines origin, morphometry, location, orientation, timing and mode of deposition of a number of coral reef boulders present on reef-flats surfaces, along the south-eastern rim areas of Fakarava Atoll, north-west Tuamotu, central South Pacific. These boulders, extracted from the upper forereef spurs, were projected onto the reef-flat zone, at distances of 51 to 235 m from the outer reef edge. Among the 44 described boulders &gt;20 m³, only 19 were revealed to be covered by well-preserved coral colonies in growth position and as such, were submitted to physical analysis and U/Th dating. Upper reef spurs have been built from about 5000 to 3000 cal. yr BP. Dominantly platy in shape, with sharp broken, lateral faces, the 19 investigated boulders range between 3 and 8.5 m long, 4 and 82 m³ in volume, 6.8 to 139.4 tons in weight. The minimum flow velocities to initially move and uplifted these blocks were estimated between about 4 to &gt;13 m/s. Morphometric comparison of the boulder set investigated at Fakarava with those from nearby atolls recognized as cyclone-moved strongly suggests that boulder detachment and deposition at Fakarava have resulted from cyclogenesis than tsunamigenic impacts. Contrary to cyclone-related boulder deposition that appears to have occurred mainly during the last centuries in the nearby atolls, U/Th dating of boulders at Fakarava reveals that cyclogenesis has increased between 3400 and 2300 cal. yr BP (15th–4th centuries BC) and between 2,000 and 1,700 cal. yr BP (1st–4th centuries AD) in the considered region, with an expected mean reccurrence time of around 30 to 50 years. This intensification of cyclone activity is interpreted as related to amplified <span>enso</span> phases in the south Pacific.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107605"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296967","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":"2025-10-01","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":"Quantitative structural geology in the deep ocean using photogrammetry: Implications for the polyphased tectonic evolution of the Buteur Ridge, French Guiana","authors":"Charline Coudun ,&nbsp;Paul Brichard ,&nbsp;Christophe Basile ,&nbsp;Sébastien Zaragosi ,&nbsp;Vincent Marieu ,&nbsp;Martin Patriat ,&nbsp;Lies Loncke","doi":"10.1016/j.margeo.2025.107609","DOIUrl":"10.1016/j.margeo.2025.107609","url":null,"abstract":"<div><div>The Buteur Ridge is a 7 km-long and 6 km-wide relief on the eastern rifted margin of the Demerara Plateau, offshore French Guiana. This margin was formed during the Lower Cretaceous. In early 2023, the oceanographic cruise DIADEM used a manned deep submersible (<em>Nautile</em>) to sample and directly observe the eastern flank of this 3750 m-deep ridge.</div><div>This study presents a new underwater photogrammetric method developed from the <em>Nautile</em> video records. This method incorporates both camera and submarine movements to produce photogrammetric 3D models of the seafloor below decimetre scale. The presented underwater photogrammetric method can be used for both past and future video records, as long as both underwater device and camera movements are recorded.</div><div>The data obtained from the 3D reconstructions allow to reconstruct detailed stratigraphic and structural framework of the Buteur Ridge. The eastern flank of the Buteur Ridge is entirely composed of sedimentary layers. Structural analysis at bed scale suggests prograding structures likely associated with a N-S-directed paleocurrent. At ridge scale, structural analysis combined with seismic observations suggests that the Buteur Ridge is the result of a polyphased tectonic evolution. We highlight that Cretaceous tilted blocks, bounded by east-dipping faults, are overlapped by a post-rift unit. The syn-rift units are in contact with the east-dipping post-rift unit by a post-rift unconformity. Subsequent tilt and fault reactivation offset both the post-rift unconformity and the post-rift unit, resulting in the present relief of the Buteur Ridge.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107609"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144502505","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":"2025-10-01","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":"Morphologically adaptive modelling of sea level rise induced coastal erosion impacts for south-east Australia","authors":"Robert Jak McCarroll ,&nbsp;David M. Kennedy ,&nbsp;Daniel Ierodiaconou","doi":"10.1016/j.margeo.2025.107602","DOIUrl":"10.1016/j.margeo.2025.107602","url":null,"abstract":"<div><div>Sea level rise induced coastal erosion represents an impending threat to the world's coastlines. A critical control on coastal recession is the onshore accommodation space available for a receding beach to occupy. Despite the importance of morphologic controls, coastal change models applied at regional-scale over ∼100-year time-frames typically address a limited range of coastal morphologies.</div><div>ShoreTrans is a shoreface translation model that kinematically projects profile change, based on inputs of sea level rise and sediment budget imbalances. This work presents updates to enable broad-scale model application (1000's km), automating classification and adapting to the morphology of individual profiles, including: (1) dunes; (2) cliffs; (3) bluffs and ridges; (4) inter-subtidal rock outcrops; (5) protection structures; (6) low-energy environments; and (7) short-term dune erosion. The model was applied to Victoria, Australia (2000 km coastline, 30 m spaced transects), for a scenario of 1 m sea level rise from 2010 to 2100, using a single time step and simplified treatment of uncertainty and sediment budget. Shoreline trends and variability were determined from satellite extracted shorelines.</div><div>Mean projected shoreline recession of 43 m is 20 % lower than for a simple parameterization (uncertainty range 58 % lower to 8 % higher), due to sediment transfer from the backshore to the active shoreface (e.g., dune encroachment) and hard backshores restricting shoreline movements (e.g., cliffs, seawalls). Low dunes exhibited the highest recession rates, due to rollover (68 m long-term recession). Total setback extent, including short-term variability, is projected to exceed 182 m in 5 % of low dune areas. High rates of beach loss were associated with beaches fronting hard cliffs (55 % beach loss) and seawalls (80 %). The worst impacts are expected for rocky, sediment poor coastlines, such as the Great Ocean Road Surf Coast, where a loss of 30 % to 50 % of beaches is projected, not accounting for infrastructure and potential management interventions.</div><div>Automated morphological adaptation represents a step-change for regional scale coastal change assessment. The method also allows for coupling of future erosion to inundation hazards, by interpolating a 3D surface of future morphology. At local-scale, ShoreTrans is suitable to add to hybrid models, providing a means to improve future coastal change projections.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"488 ","pages":"Article 107602"},"PeriodicalIF":2.6,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144535433","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":"2025-10-01","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}