Basin Research最新文献

{"title":"Anatomy of Rift-Segmenting Transfer Zones: New Insights From the 3D Integrated Interpretation of the Southeastern Sector of the Basque-Cantabrian Basin and the Pamplona Fault (Pyrenees, N Spain)","authors":"Cristina Bravo,&nbsp;Juan C. Larrasoaña,&nbsp;Juan I. Baceta","doi":"10.1111/bre.70084","DOIUrl":"10.1111/bre.70084","url":null,"abstract":"<p>The Pamplona Fault at the SE Basque-Cantabrian Basin is one of the most notable and controversial transverse faults of the Pyrenees. Previous studies of this structure have been based on the analysis of single geological and geophysical datasets, which has resulted in a variety of interpretations regarding its origin and role during the Mesozoic rifting and Cenozoic inversion of the Pyrenean orogen. In this study, a 3D model integrating all the geological and geophysical information available for the transition between the Basque-Cantabrian, Jaca-Pamplona and Ebro foreland basins has been built to provide an updated, comprehensive view of the Pamplona Fault. We have found strong conclusive evidence for its presence in the Palaeozoic basement, as part of a widespread NNE-SSW fault network that extends across the study area. Further evidence for the activity of the fault during the Mesozoic rifting derives from the geometry and sedimentary evolution of the overlying, allochthonous Cretaceous sedimentary units. Overall, our results indicate that the Pamplona Fault represented the easternmost boundary of the Basque-Cantabrian basin during Hauterivian-Barremian times, was active during the beginning of the hyperextension process that led to the eastward propagation of the basin across the fault during the Aptian-early Albian and acted as an accommodation structure during the rest of the Cretaceous. By the integration of these results with those from surrounding areas, we identify this fault not as a single structure but as a ~65 km-wide strip labelled Pamplona Transfer Zone that includes the neighbouring Hendaya and Oroz-Betelu faults and represented a diffuse transfer linkage between the Basque-Cantabrian and Mauléon segments of the Pyrenean rift. This wide transfer zone also exerted a clear role during the Cenozoic inversion of the rift, for it had an impact on the style of deformation and the local configuration of the Pyrenean thrust front.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145897811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Thermal History of the Ediacaran/Cambrian Sediments on the East European Craton Inferred From Low-Temperature Thermochronology","authors":"Aneta Agnieszka Anczkiewicz,&nbsp;Jan Środoń,&nbsp;István Dunkl","doi":"10.1111/bre.70081","DOIUrl":"10.1111/bre.70081","url":null,"abstract":"<div>\u0000 \u0000 <p>Organic maturation and clay mineral-based estimates of the maximum paleotemperatures experienced by the Precambrian/Cambrian sediments on the East European Craton (EEC) are in disagreement. To resolve this conflict and reconstruct thermal histories of these sedimentary rocks we used three low-temperature thermochronometers: zircon and apatite (U–Th)/He (ZHe, AHe) and apatite fission track (AFT) methods, complemented by AFT modelling of thermal histories. At the cratonic edge (Podillya), the ZHe ages are partially reset, implying that the AFT ages are fully reset, and that the maximum paleotemperatures were in the range of 160°C–200°C, similar to earlier estimates based on the degree of illitization of smectite. Comparison with analogous data for the overlying Silurian bentonites identifies the edge zone of the former Devonian/Carboniferous Variscan foreland basin. In the Podillya region the modelling of thermal history of the Cambrian/Ediacaran strata indicated exhumation in Carboniferous time. In the cratonic interior (Volyn, Belarus, and Lithuania), the AFT ages are totally or partially reset, implying the maximum paleotemperatures close to 120°C, which confirm earlier estimates based on the degree of illitization of smectite, but are higher than the estimates based on the organic geochemistry. The relatively short mean confined tracks lengths (13.6 ± 0.4 to 10.8 ± 0.4 μm), and their varied standard deviation values (2.1–0.9) indicate slow exhumation within the partial annealing zone.</p>\u0000 </div>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear Localisation and Its Impact on Mass-Transport Complexes Seal Potential: Insights From Geophysical Datasets","authors":"Zhenghao Han,&nbsp;Nan Wu,&nbsp;Jinfeng Ren,&nbsp;Zenggui Kuang","doi":"10.1111/bre.70082","DOIUrl":"10.1111/bre.70082","url":null,"abstract":"<div>\u0000 \u0000 <p>Mass-transport complexes (MTCs), the deposits of submarine slope failures and common features of sedimentary basins worldwide, can act as effective seals for hydrocarbons and carbon sequestration due to shear-induced overcompaction. However, seal failure is occasionally observed in specific parts of MTCs, leading to hydrocarbon and carbon dioxide leakage and posing potential threats to seabed stability. In this study, we combine 3D seismic and well log data from Qiongdongnan Basin, northern South China Sea, to investigate the mechanisms that influence and control the seal potential of MTCs. We identified three vertically stacked MTCs overlying a gas hydrate bearing interval. Seismic interpretation reveals that MTCs seal tends to fail in intervals where MTCs overlies the frontal ramp or remnant block, whereas the remaining intervals effectively seal the underlying gas hydrate. Petrophysical analyses show that MTCs intervals overlying frontal ramps or remnant blocks exhibit significantly lower density and velocity, higher porosity and permeability, indicating reduced compaction in these intervals. Numerical simulations indicate that during MTCs emplacement, shear localisation normally develops in the lowermost part, forming a narrow (10%–20% MTCs total thickness), highly deformed basal shear zone. However, shear localisation is disrupted by the remnant block or frontal ramp, leading to low shear strain and thus low seal potential in MTCs intervals overlying the remnant block or frontal ramp. Therefore, we propose that shear localisation is a key mechanism controlling the seal potential of MTCs. Disruption of this process during emplacement can significantly compromise MTCs seal potential, with important implications for understanding hydrocarbon distribution and for assessing the feasibility of submarine carbon sequestration using MTCs as natural seals.</p>\u0000 </div>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"38 1","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836286","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Modelling Radiolytic Natural Hydrogen From a Fractured Basement: Generation, Migration, and Sequestration Potential (Taranaki Basin–New Zealand)","authors":"Muhammed Abdullahi,&nbsp;Aurelien Gay,&nbsp;Nicolas Saspiturry,&nbsp;Juan Carlos Hidalgo,&nbsp;Marguerite Godard","doi":"10.1111/bre.70078","DOIUrl":"10.1111/bre.70078","url":null,"abstract":"<p>The search for natural hydrogen (H₂) in sedimentary basins is gaining increasing recognition due to its environmental friendliness. Therefore, as an alternative energy source, natural hydrogen could address the issue of environmental challenges and participate in the energy mix necessary for the energy transition. Despite ongoing research, many uncertainties remain in H₂ exploration, which is still at an early stage. In this work, we provide, for the first time, a numerical model of radiolytic natural H₂ generation from the fractured basement based on the Taranaki Basin example (New Zealand). This approach uses conventional hydrocarbon exploration techniques, with some adjustments to properly reproduce the subsurface natural H₂ behaviour. We calculated the potential radiolytic H₂ generation rate to be approximately 10.3 mg/g/Ma. This value was used as a constant rate input in the model. Potential reservoirs within the possible optimal H₂ preservation window (80°C–200°C) include the Tane formation sandstone, as well as the Taimana and Tikorangi carbonate formations. The model highlights that H₂ mass concentration in water is higher along the faults and in interbedded sand facies of the Rakopi and Wainui formations, implying that hydrogen in solution could migrate both by diffusion and advection along these paths. The density inversion of the seal and the underlying reservoirs began at 9.4 Ma and 6.8 Ma in the Witiora and Taranga boreholes respectively, due to the northwestward progradation of the Mohakatino Formation. This inversion indicates a period during which hydrogen-saturated water could be trapped or experience delayed flow, potentially leading to the exsolution of supersaturated hydrogen into a gaseous phase. The Tane formation gas anomaly reported during the drilling could be due to the conversion of CO₂ into abiotic CH₄ via the Sabatier reaction at higher temperatures (&gt; 200°C). Consequently, abiotic CH₄ could be an accurate proxy for depicting natural H₂ generation.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145753051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Dating Two Successive Rifts of the Equatorial Atlantic From the Sediments of the Buteur Ridge, Demerara Plateau (French Guiana)","authors":"Charline Coudun,&nbsp;Christophe Basile,&nbsp;Matthias Bernet,&nbsp;Mélanie Balvay,&nbsp;Julien Léger,&nbsp;Bruno Lanson,&nbsp;Martin Patriat,&nbsp;Jérémie Gaillot,&nbsp;Lies Loncke","doi":"10.1111/bre.70076","DOIUrl":"10.1111/bre.70076","url":null,"abstract":"<div>\u0000 \u0000 <p>The permanent oceanic connection between the Jurassic Central Atlantic and the Cretaceous South Atlantic was only established with the late opening of the Equatorial Atlantic, but the timing of this event remained unclear due to a lack of geological dating. In 2023, the DIADEM oceanographic cruise conducted sampling of the Buteur Ridge, offshore French Guiana, by dredging and during a manned deep submersible (<i>Nautile</i>) dive. The Buteur Ridge belongs to the eastern rifted margin of the Demerara Plateau, formed during the Lower Cretaceous Equatorial Atlantic rift. It is a 7 km-long and 6 km-wide tilted block, located at a depth of 3750 m, where sedimentary records of the Equatorial Atlantic are outcropping, making it an ideal location for investigating the timing of this rift.</p>\u0000 <p>We integrate petrological observations, biostratigraphy, fission-track analyses of detrital apatites and zircons, and LA-ICP-MS U–Pb dating of authigenic apatites to reconstruct the sedimentary, diagenetic and thermal history of the sediments sampled on the Buteur Ridge.</p>\u0000 <p>Our results constrain the tectono-sedimentary evolution of the divergent margin of the Demerara Plateau, revealing a complex rifting history of the Equatorial Atlantic involving two distinct rifts. The onset of the first rift occurred between 130 and 125 Ma (Hauterivian), which is earlier than the previously proposed Aptian age. A second rifting then occurred during the Cenomanian, likely during the kinematic reorganisation between Africa and South America in the Equatorial Atlantic. This later rifting is evidenced on the Buteur Ridge by terrigenous sedimentation followed by telodiagenesis during basin inversion, likely related to normal fault reactivation and ridge uplift. We interpret the crystallisation of authigenic apatites, dated 93 ± 12 Ma, as a record of the subsequent onset of marine transgression at the end of this second rifting, likely not occurring after the Late Cenomanian (circa 93 Ma).</p>\u0000 </div>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Depositional Characteristics of a Tectonically Controlled Washover Fan Succession in a Semi-Enclosed Seaway: A Case Study in the Xihu Depression, East China Sea Shelf Basin","authors":"Xiaobo Zheng,&nbsp;Hongtao Zhu,&nbsp;James A. MacEachern,&nbsp;Wei Zou,&nbsp;Yinshan Chang,&nbsp;Jianbin Liu,&nbsp;Tonglei Zhang,&nbsp;Qianghu Liu,&nbsp;Zhiwei Zeng,&nbsp;Haijin Wang","doi":"10.1111/bre.70080","DOIUrl":"10.1111/bre.70080","url":null,"abstract":"<div>\u0000 \u0000 <p>Washover fans form during intense storms through barrier breaching and coastal inundation. Despite their importance for understanding coastal response to storms and their potential as stratigraphic traps, ancient washover fans remain poorly documented and underrepresented in subsurface studies, resulting in limited criteria for their recognition. This study investigates the depositional characteristics, controls, and dispersal patterns of a tectonically controlled washover fan succession within the late Eocene Pinghu Formation, Xihu Depression, using 3D seismic, geological and geophysical logs, and petrology. Based on palaeogeography, heavy mineral analysis, seismic-based provenance analysis, and paleocurrent studies suggest that the Pinghu Formation records a barrier island system. Successions of washover fan deposits are tens of meters thick and comprise stacked 0.5–2.0 m (locally up to 6.6 m) thick, medium- to fine-grained sandstone beds. Individual sandstone beds are generally poorly sorted, normally graded, contain gravel lags, and exhibit parallel stratification. Grain-size distributions and spatial trends from different wells support a marine-to-landward transport process. Petrology shows abundant dolomite crystals and bioclasts. The washover fan deposits are interbedded with thoroughly bioturbated mudstone intervals, which are interpreted as back-barrier bay deposits. These successions are significantly different from those of river-dominated deltas and flood-tidal deltas present in the study area. Washover fan development and preservation are controlled by sea-level fluctuations, sediment supply, and antithetic faults with associated paleo-uplifts. The fan dispersal pattern was confined to the syn-rift period and coincided with rapid sea-level rise. This study provides criteria for the identification of ancient washover fans and enhances our understanding of their development. Additionally, owing to the succession's significant stratigraphic trap potential, this study is a useful reference for petroleum exploration in the East China Sea Shelf Basin and analogous basins.</p>\u0000 </div>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145731863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 Spatial and Temporal Evolution of Mixed Carbonate-Clastic Mud-Dominated Basin Fill Successions: The Middle to Late Devonian Shelf Margin, Western Canada","authors":"Rene Jonk,&nbsp;Kevin Bohacs,&nbsp;Ken Potma","doi":"10.1111/bre.70079","DOIUrl":"10.1111/bre.70079","url":null,"abstract":"<p>Middle to Upper Devonian strata preserved in the Mackenzie Mountains and adjacent basins in the Northwest Territories, Canada, record a transgressive sequence set of shelfal marine deposits in a low latitude basin margin transitioning from drift to convergence basin phase. The interplay between shallow-water carbonate and clastic depositional systems and offshore organic-matter-rich mudstone deposits is described within a chronostratigraphic and sequence stratigraphic framework. Relative rise of sealevel resulted in backstepping and flooding of a carbonate ramp by biosiliceous and organic-matter-rich mudstones. Steep isolated stromatoporoid carbonate platforms show rapid lateral facies transitions associated with these transgressions. At times of tectonically induced relative falls in sea level and exposure of updip carbonate deposits, clastic sediment was transported across the basin margin, resulting in the deposition of mud-rich subaqueous clinothems. Transgression of these clinothems led to the deposition of onlapping wedges of organic-matter-rich mudstones. Three main sequences are developed within this overall transgressive sequence set, and these three sequences can be correlated from outcrop to subsurface, both in the adjacent Peel and Mackenzie Valley Basins as well as into the subsurface strata of the Horn River and Liard Basins, which are prolific hydrocarbon basins to the south. Each depositional system develops distinct seismic geomorphologies and allows for the mapping of favourable lithofacies belts with regard to identifying carbonate deposits (aquifers and petroleum reservoirs) and organic-matter-rich mudstones (source rocks and unconventional reservoirs). The workflows and regional chronostratigraphic framework may be applied to coeval deposits along the divergent and convergent margins of Laurentian and Gondwanan cratons preserved across the globe.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70079","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145718444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Oligocene—Miocene Tectono-Stratigraphic Development of the Southern Levant Basin, Eastern Mediterranean Sea","authors":"Amir Joffe,&nbsp;Rebecca E. Bell,&nbsp;Josh Steinberg,&nbsp;Christopher A.-L. Jackson,&nbsp;Yizhaq Makovsky","doi":"10.1111/bre.70075","DOIUrl":"10.1111/bre.70075","url":null,"abstract":"<p>The southern Levant Basin, Eastern Mediterranean, has a complex geological history. The separation of Africa from Arabia, and the collision of the latter with Eurasia during the Oligocene–Miocene had significant implications for the tectono-stratigraphy of the region, as recorded in the thick, siliciclastic-dominated sequence preserved in the southern Levant Basin. Previous studies mostly focused on either onshore or relatively local offshore areas, with a synthesis of the interplay between plate motions and sedimentation still lacking. Using multiple high-resolution, 3D seismic reflection surveys, we generated sediment thickness maps, spectral decomposition, and ISO-proportional slices that document the structural and sedimentological elements shaping the basin during the Oligocene–Miocene. More specifically, our results show that during the Early Oligocene, sedimentation was dominated by an easterly (Arabian) source, whereas the Late Oligocene to Aquitanian witnessed a shift to a southerly (African) source through the evolution of the Nile River. The Burdigalian period marked a significant tectono-stratigraphic transition period during which large-scale folding, regional faulting and renewed incision had occurred. The Langhian–Serravallian was followed by widespread carbonate deposition. The Early Tortonian is marked by a thick, extensive, seismically chaotic interval that underlies deposits associated with the Messinian Salinity Crisis. This interval is identified across the basin, being associated with the collision of Cyprus and Eratosthenes, a major tectonic event that affected the entire Southern Levant Basin. The Late Tortonian–Messinian was largely characterised by widespread submarine incision across the southern Levant Basin. Our study reveals how sedimentary systems record important clues as to complex tectonic reorganisations involving rifting, subduction and strike-slip motion.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145651126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Structural Control on the Complex Platform to Basin Transition of a Mississippian Carbonate Platform in the Southern East Irish Sea Basin, UK","authors":"Maulana Rizki Aditama,&nbsp;Mads Huuse,&nbsp;David Healy,&nbsp;Darren Jones,&nbsp;Cathy Hollis","doi":"10.1111/bre.70072","DOIUrl":"10.1111/bre.70072","url":null,"abstract":"<p>Mississippian-aged (Lower Carboniferous) syn-rift carbonate platforms in the UK have been extensively studied in outcrop. They have been interpreted to grow principally on the footwall of faults, with deeper marine sedimentation in the adjacent hanging wall basins. However, the transition from the shelf margin to the basin is often poorly constrained due to a lack of exposure and the scarcity of high-quality seismic data. With renewed interest in Mississippian carbonate strata as potential geothermal reservoirs in northern Europe, a better understanding of the detailed geometry of these carbonate platforms, and the controls on their growth and demise, is crucial as it provides insights into their occurrence, size and thickness and burial/exposure history. This study uses high-resolution 3D seismic data from the southern part of the offshore East Irish Sea Basin (EISB), western UK, to identify, characterise and map the platform to basin transition of the North Wales carbonate platform, exposed on the North Wales coastline. The results indicate that there is not a simple platform to basin transition, as has previously been mapped, but that the North Wales platform gives way offshore to numerous small carbonate platforms, the presence of which is predominantly controlled by N-S-oriented extensional faults. The fault orientation is not consistent with the regionally interpreted N-S stress direction during the Mississippian, but fault growth analysis suggests that their orientation most likely reflects the precursor structural grain. These faults facilitated the development of horst-graben structures, promoting carbonate growth on footwalls within the EISB. Six areas of potential carbonate platform development (A1–A6) were mapped and evaluated. Thicknesses range from ~1 to 2 km. The platforms prograded during the Tournaisian, characterised by low-angle slopes, followed by a backstepping phase in the Visean, marked by steeper slopes. The platforms significantly shrank in size from the early Tournaisian to the Visean, resulting in the formation of complex, patchy carbonate platforms with diverse shapes and sizes. The results demonstrate that numerous small carbonate platforms grew in the EISB on structural highs but were susceptible to environmental change at the end of the Mississippian, causing them to become increasingly isolated and to eventually drown.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145613534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Megabeds in the Marsili Basin, Tyrrhenian Sea","authors":"Faye Higgins,&nbsp;Derek E. Sawyer,&nbsp;Roger Urgeles","doi":"10.1111/bre.70074","DOIUrl":"10.1111/bre.70074","url":null,"abstract":"<p>Megabeds, also known as ‘megaturbidites,’ are exceptionally large submarine sediment deposits likely formed by catastrophic geohazard events. These deposits are increasingly being identified with modern high-resolution geophysical data, yet their origins and characteristics remain debated. Five megabeds have been identified in the Marsili Basin of the Tyrrhenian Sea within the upper 70 m of sediment. These deposits are hypothesized to have been triggered by explosive volcanic eruptions of the Campanian Volcanic Province, including the ~39.8 ka Campanian Ignimbrite (CI) super-eruption, which is among the largest known eruptions, having a volcanic explosivity index (VEI) of 7. These megabeds were intersected by Ocean Drilling Program (ODP) Leg 107 Site 650, where sediment cores were collected in 1986. However, their presence was not recognized at the time due to lack of appropriate geophysical data. To better understand the properties and origins of the Marsili Megabeds, we identified the megabeds within the ODP cores and conducted detailed sedimentological and elemental analyses, along with age dating, to determine their possible sediment provenance, depositional mechanisms, and potential triggering events. Elemental analysis and age dating suggest a potential link between these megabeds and known eruptions from the Campanian Volcanic Province, including the Neapolitan Yellow Tuffs eruption (14.9 ka), the Masseria del Monte Tuff eruption (29.3 ka), and the Campanian Ignimbrite super-eruption (39.8 ka). A new megabed discovered below the Y-7 tephra is older than 60,300 years but its triggering event is unknown. The re-examination of ODP cores reveals that not all megabeds conform to a megaturbidite morphology. In the Marsili Basin, the variety of sedimentological structures differs within and between megabeds, suggesting varying and complex depositional mechanisms. The findings reveal that the megabeds are more internally complex than previously thought, with variations in their depositional processes even in one basin.</p>","PeriodicalId":8712,"journal":{"name":"Basin Research","volume":"37 6","pages":""},"PeriodicalIF":2.6,"publicationDate":"2025-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/bre.70074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145609513","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}