Depositional Record最新文献

{"title":"Holocene evolution of the Banni Plain at the north-east margin of the Arabian Sea: Constraints from a ca 50 m long sediment core","authors":"Abhishek Kumar,&nbsp;Deepak M. Maurya,&nbsp;Binita Phartiyal,&nbsp;Mohammad Arif,&nbsp;Niteshkumar Khonde,&nbsp;Ravi Bhushan,&nbsp;Partha Sarathi Jena,&nbsp;Ankur Dabhi,&nbsp;L. S. Chamyal","doi":"10.1002/dep2.241","DOIUrl":"10.1002/dep2.241","url":null,"abstract":"<p>Holocene evolutionary history of the Banni Plain in the Great Rann of the Kachchh Basin is reconstructed from a subsurface sediment core of <i>ca</i> 50 m. Detailed data on textural and lithofacies variations, grain-size analysis, environmental magnetism and accelerator mass spectrometry ¹⁴C dates on seven samples were generated on the sediment core retrieved from the Banni Plain near Berada. A high-resolution record extending back to 10 ka has been reconstructed from the top <i>ca</i> 40 m of the core section comprising shallow marine sediments. The core is divisible into five depositional units. The basal part is a fluvial depositional unit followed upward by estuarine, sub-tidal, intertidal and supra-tidal environments. The sediment accumulation rate is highest in the sub-tidal to intertidal facies (1.9 cm year⁻¹) and decreases towards the supra-tidal facies to 0.09 cm year⁻¹. Environmental magnetic analysis, χlf coupled with the S-ratio, indicates high magnetic mineral concentrations during the Early Holocene, suggesting a wet period accompanied by high monsoon precipitation. This is followed by the onset of semi-arid conditions in the Great Rann of the Kachchh Basin as indicated by the low values of the χlf and S-ratios. A westward and northward shift in the shoreline towards the deeper part of the basin is suggested during the Late Holocene, which is coupled with aridity and reduced monsoonal conditions. The change in depositional pattern from the retrogradational deposit of fluvial (Unit 1) to estuarine sediment (Unit 2), progressing to sub-tidal (Unit 3), is attributed to sea-level transgression followed by regressive intertidal (Unit 4) to supra-tidal deposition (Unit 5), culminating in complete withdrawal of the sea, aided by tectonic uplift, during the Late Holocene. The results reveal that the sediment accumulation rates and depositional environments changed over time in response to changes in sea level from minima to maxima and then eventually to the present level.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"895-920"},"PeriodicalIF":2.4,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45686960","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":"Reef island evolution in a turbid-water coral reef province of the Indo-Pacific","authors":"Joshua L. Bonesso,&nbsp;Michael V. W. Cuttler,&nbsp;Nicola K. Browne,&nbsp;Caroline C. Mather,&nbsp;Victorien Paumard,&nbsp;William T. Hiscock,&nbsp;John N. Callow,&nbsp;Michael O'Leary","doi":"10.1002/dep2.242","DOIUrl":"10.1002/dep2.242","url":null,"abstract":"<p>Coral reef islands are vulnerable landforms to environmental change. Constructed of largely unconsolidated reef-derived sediments, they are highly sensitive to variations in metocean boundary conditions, raising global concern about their future resilience and stability in the face of increased natural hazards, sea-level rise and anthropogenic climate change. This study examines the evolution of an inshore turbid reef island from the southern Pilbara region of Western Australia (Indo-Pacific) using detailed analyses of island chronostratigraphy (composition, texture) and geochronology (21 <i>in-situ</i> radiometric dates) from Eva Island. Downcore, composition of island-grade (reef-derived) sediments were homogenous, dominated by molluscan (37%–42%) and coral (32%–37%) constituents. The ¹⁴C radiometric dating of island sediments, beachrock and coral microatolls identified five stages of island formation across changing sea-level regimes over the mid to late Holocene: (1) limestone platform accretion at <i>ca</i> 6,000 cal yr BP, coinciding with reef decline or ‘give-up’ on neighbouring Exmouth Gulf reefs; (2) sand cay (i.e. core) initiation and vertical aggregation at <i>ca</i> 5,000 cal yr BP during the point of sea-level regression to current levels; (3) major accretion and lateral progradation of the island between 3,500 cal yr BP and 2,500 cal yr BP including the modification of island shorelines through alongshore reworking of sediment; (4) lateral accretion and minor expansion to the north and formation of beachrock pavement between 2,500 and 650 cal yr BP; and (5) planform adjustment (erosion of the north-west island) and backstepping under stabilised sea levels over the past 650 years. While this model is comparative to studies on island formation following incremental sea-level fall following the mid-Holocene highstand, it demonstrates active landform readjustment under stabilised sea levels over the past 2,000 years, probably the influence of local-scale metocean boundary conditions within climate windows across the mid to late Holocene period (i.e. independent of sea-level fluctuations). Importantly, while sediment production rates are predicted to be lower in turbid-water reef systems than clear water, Eva Island shows no change in carbonate producers (i.e. proportion of mollusc and coral) over the course of island building, indicating the carbonate factory has not experienced significant adjustments in reef ecology, but has remained stable despite low water quality.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"921-934"},"PeriodicalIF":2.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.242","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46121034","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":"Occurrence and Genesis of Cold-Seep Authigenic Carbonates from the South-Eastern Mediterranean Sea","authors":"R. Weidlich,&nbsp;O. M. Bialik,&nbsp;A. Rüggeberg,&nbsp;B. Grobéty,&nbsp;T. Vennemann,&nbsp;A. Neuman,&nbsp;Y. Makovsky,&nbsp;A. Foubert","doi":"10.1002/dep2.239","DOIUrl":"10.1002/dep2.239","url":null,"abstract":"<p>Methane-derived authigenic seep carbonates occur globally along continental margins. These carbonates are important archives to identify seep dynamics, the source of the ascending methane-enriched fluids together with their timing, and are an important carbon sequestration mechanism. Recently, seep carbonates were discovered in the Levant Basin in the south-eastern Mediterranean Sea. To elucidate past seepage activity and dynamics across the basin, different seep carbonate morphologies (chimneys, crusts and pavements) retrieved from the Levant Basin were mapped based on remotely operating vehicle data and analysed using standard sediment petrographic techniques, X-ray diffraction and stable carbon and oxygen isotope analyses. Carbonate chimneys consist of micrite (δ¹³C_VPDB of −10‰ to +5‰) with dispersed baryte and dolomite crystals, fan-shaped aragonite (δ¹³C_VPDB of −52‰ to −30‰) and high-magnesium calcite cements, with the latter often growing from low-magnesium calcite spherules. Botryoidal low-magnesium calcite cements are forming in small cavities. Carbonate crusts consist of micrite with low-magnesium calcite breccias, high-magnesium calcite nodules (δ¹³C_VPDB of −35‰ to −20‰) and cements, and partially replaced fan-shaped aragonite cements. Carbonate pavements consist of low-magnesium calcite microsparite, micritic dolomite and high-magnesium calcite. Fan-shaped aragonite is locally present as pore-lining cement. Iron oxides are often seen coating the low-magnesium calcite, high-magnesium calcite and dolomite cements. Chimneys and crusts, characterised by high amounts of high-magnesium calcite and aragonite, are interpreted to have formed through advective methane fluxes. Pavements, with high quantities of dolomite, are explained as the product of diffusive methane flux. Sediment petrographic and geochemical analysis of the different carbonate morphologies and cement phases therein witness distinct modes of ascending fluid fluxes and their mixing with marine pore water and/or sea water during precipitation of the individual phases.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"844-870"},"PeriodicalIF":2.4,"publicationDate":"2023-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.239","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51503244","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":"Interactions between distal epiclastic and bio-chemogenic sedimentation at the foothills of a mafic alkaline volcano: The case of the Oligocene Doupovské Hory Volcanic Complex (Czech Republic)","authors":"Vladislav Rapprich,&nbsp;Pavel Čáp,&nbsp;Yulia V. Erban Kochergina,&nbsp;Eva Kadlecová,&nbsp;Zsolt Benkó,&nbsp;Jakub Sakala,&nbsp;Zuzana Rodovská,&nbsp;Jan Matějů,&nbsp;Daniel A. Petrash","doi":"10.1002/dep2.240","DOIUrl":"10.1002/dep2.240","url":null,"abstract":"<p>Late Oligocene (<i>ca</i> 25 Ma) volcano-sedimentary successions exposed on the western periphery of the Doupovské Hory Volcanic Complex reveal a complex sedimentation history influenced in various ways by decay of the alkali basalt volcanic edifice. Weathering of the volcanic rocks supplied abundant reactants that promoted carbonate precipitation in the peripheral palaeolakes—as evidenced by strongly non-radiogenic ⁸⁷Sr/⁸⁶Sr values (0.7038–0.7041). On the other hand, the sediments of the initial shallow lake became deformed by the bulldozing effect of a debris avalanche. The debris flow and avalanche deposits filled up the original depression, modified the basin morphology and shifted the peripheral lacustrine setting further away from the volcano. At this stage, surface water influx from the surrounding granites conferred a more radiogenic character (⁸⁷Sr/⁸⁶Sr values 0.7046–0.7049) to the calcrete deposits. Fossil assemblages as well as limestone textures suggest significant seasonal water-level fluctuations, possibly reflecting the alternating rainy and dry-seasons of a prevalently humid Central-European Late Oligocene climate. The seasonal drying out of the ponds resulted in significant ¹⁸O enrichments. Although the <i>ca</i> 0‰ δ¹³C values might suggest mixing of atmospheric and volcanic CO₂ during carbonate precipitation, no active volcanic conduits of relevant age are known in the close vicinity. The lower δ¹³C values are likely a result of mantle degassing through rift faults, a phenomenon observed in the magmatically extinct Ohře Rift until present. This paper demonstrates that limestones derived from weathered alkaline basalts are characterised by highly non-radiogenic Sr isotopic ratios (⁸⁷Sr/⁸⁶Sr <i>ca</i> 0.704), suggesting a magmatic origin for the Ca within these carbonates. Contrary to the notion of carbonatites being present when highly non-radiogenic Sr isotopes are found, these results show that Sr isotopes in carbonates formed in alkali basalt-sourced environments only reveal the source of the Sr (and Ca) ions, not necessarily the presence of carbonatite.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"871-894"},"PeriodicalIF":2.4,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.240","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41704883","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":"Storm-flood-dominated delta succession in the Pleistocene Taiwan Strait","authors":"Romain Vaucher,&nbsp;Antoine Dillinger,&nbsp;Amy I. Hsieh,&nbsp;Wen-Rong Chi,&nbsp;Ludvig Löwemark,&nbsp;Shahin E. Dashtgard","doi":"10.1002/dep2.231","DOIUrl":"10.1002/dep2.231","url":null,"abstract":"<p>Storm-flood-dominated deltas are sedimentary systems in which a complex interplay of hydrodynamic processes occurs during storms (e.g. tropical cyclones) due to the coeval action of continental and oceanic processes. This paper reports on a superbly exposed, 135.5 m thick stratigraphic succession of the Pleistocene Cholan Formation exposed along the Da'an River, Taiwan. The sedimentary succession comprises alternating mudstone and sandstone, is mostly fine-grained, and exhibits multiple event beds that record deposition during tropical cyclones and post-depositional deformation features produced during earthquakes. Detailed facies analyses reveal that deposition towards the base of the succession occurred in the palaeo-Taiwan Strait in storm-flood-dominated prodelta and delta-front environments passing upwards into delta-plain environments. Tropical cyclone beds are encountered throughout the subaqueous storm-flood delta successions, and are identified by (i) trough cross-stratified sandstone bedsets with erosive bases that contain both mud clasts and mudstone beds, (ii) sandstone with aggrading wave ripples and (iii) hummocky cross-stratified sandstone with rare gutter casts filled with coal fragments and shell remains. Tropical cyclone deposits are either top-down burrowed or capped by massive or laminated mudstone. Seismites are rare and are mainly recognised through soft-sediment deformation of beds; they do not show evidence of slope failure. Compared to storm-flood delta successions described elsewhere, the Cholan Formation shows significantly fewer oscillatory-generated sedimentary structures and gutter casts. This difference is attributed to the Cholan Formation being deposited in and along the margin of a strait characterised by strong shore-parallel currents and relatively small storm waves due to its position between Taiwan and mainland China. This study refines depositional process interpretations of the Cholan Formation, provides criteria for recognising storm-flood delta deposits in tectonically active straits with multiple sediment sources fed by steep drainages and short river catchments, and provides additional criteria for recognising tropical cyclone deposits in shallow-marine settings.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"820-843"},"PeriodicalIF":2.4,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.231","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43165545","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":"The effect of sea-level rise on estuary filling in scaled landscape experiments","authors":"Steven A. H. Weisscher,&nbsp;Pelle H. Adema,&nbsp;Jan-Eike Rossius,&nbsp;Maarten G. Kleinhans","doi":"10.1002/dep2.233","DOIUrl":"10.1002/dep2.233","url":null,"abstract":"<p>When sea-level rise slowed down in the middle Holocene, fluvial and coastal sediments filled the newly created accommodation, whilst others remained largely unfilled because of limited sediment supply. In view of current and future rapid sea-level rise, the question arises how estuarine systems will adapt and whether the land-level rise may keep up. Besides geological data and conceptual models of large-scale and long-term estuary filling, little is known about the filling process during sea-level rise on the decadal-to-centennial time scale that is relevant for society. This study focusses on how sea-level rise affects the morphological and hydrodynamic development of filling estuaries. To this end, scaled laboratory experiments were conducted in a tilting flume facility that creates bidirectional tidal currents and develops entire estuaries. A net importing estuary with sand, mud and vegetation was formed that was subjected to linear sea-level rise. Findings show less of the imported sand was deposited landward following sea-level rise than in an experiment without sea-level rise. The bay-head delta and the flood-tidal delta retained nearly enough sediment to keep up with sea-level rise, whilst the tidal embayment in between drowned except for the highest vegetated bars. Sea-level rise also reduced vegetation survival and sprouting potential, as prolonged inundation increased mortality, negating the potential eco-engineering effect. This resulted in lower vegetation coverage with sea-level rise than under constant sea level. These findings suggest that sea-level rise may cause natural systems to drown even if nearly sufficient sediment is available to fill the newly created accommodation, particularly in areas further away from the fluvial and marine sediment sources. Finally, depending on the sea-level rise rate, the flood-tidal delta may show back-stepping like fluvial deltas, but in the reverse direction towards the sea.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 2","pages":"363-379"},"PeriodicalIF":2.4,"publicationDate":"2023-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.233","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45766532","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":"Dolomitisation of carbonate platform margins by fault-controlled geothermal convection: Insights from coupling stratigraphic and reactive transport models","authors":"Miles Frazer,&nbsp;Cathy Hollis,&nbsp;Fiona Whitaker","doi":"10.1002/dep2.234","DOIUrl":"10.1002/dep2.234","url":null,"abstract":"<p>Reactive transport modelling is increasingly deployed to quantitatively evaluate conceptual models of diagenetic processes. However, construction of models of complex systems involves trade-offs between accuracy and simplification. This tension is explored for models of fault-associated dolomitisation by sea water convection in a syn-rift carbonate platform, evaluating the contribution of incorporating stratigraphic growth and fault propagation. Simulations of the high heat flux southern margin of the Derbyshire Platform (Northern England), with heterogeneous matrix permeability that reflects the evolving stratal architecture and burial compaction focusses dolomitisation in more permeable units at all depths. A permeable platform margin fault zone enhances dolomitisation in a broad area on the upper slope and margin, and to a lesser but significant extent, across the interior as platform top waters are entrained and discharge via the fault. Stepwise simulation of flow and reactions during stratigraphic growth suggests that static models over-predict dolomite abundance in younger sediments and show how regions optimally supplied with reactants and heat to drive dolomite formation migrate vertically and laterally during platform growth. Dolomitisation intensity increases with depth due to greater time for reactions and kinetically favourable temperatures. Adding the fault zone to this model focusses and accelerates flow, giving a more spatially restricted dolostone body and reducing dolomitisation temperature. Changes in fault connectivity with the surface of the evolving platform shift fluid flow pathways and change the rate and temperature of dolomite formation. Results concur with petrographic, isotopic and geochemical observations of the early dolomite on the Derbyshire Platform. This work demonstrates the importance of understanding diagenesis as the product of an evolving set of processes that respond to geological and palaeoenvironmental changes rather than as a sequence of individual diagenetic events. This is particularly critical for reactions, such as dolomitisation by geothermal convection of sea water, which occur over timescales synchronous with platform development.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 3","pages":"714-733"},"PeriodicalIF":2.4,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.234","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43815100","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":"Surface textures of detrital pyroxenes in coastal dune sands (western Gulf of Mexico, Mexico): Implications for their preservation and geoenvironmental processes","authors":"Juan J. Kasper-Zubillaga,&nbsp;Raymundo Gerardo Martínez-Serrano,&nbsp;David M. Buchs,&nbsp;Mauricio Mendieta-Lora,&nbsp;Elsa Arellano-Torres,&nbsp;León Felipe Álvarez-Sánchez","doi":"10.1002/dep2.228","DOIUrl":"10.1002/dep2.228","url":null,"abstract":"<p>This work investigates how the surface textures and morphology of pyroxene grains evolve during their source-to-sink history. This study applies to detrital clinopyroxenes concentrated in coastal dune sands of the Gulf of Mexico which were sourced in the Trans Mexican Volcanic Belt then transported and deposited in environments subject to limited chemical weathering. The composition and morphology of the pyroxenes was characterised using single-grain geochemical analysis and surface texture imagery with a novel approach based on the compactness property to assess the shape of minerals. This reveals heterogenous diopside-augite populations, displaying mineral morphologies dominantly controlled by impact breakage along cleavages, little physical abrasion along their edges and with limited evidence for chemical weathering. Mechanical surface textures dominate over mechanical/chemical and chemical surface textures. These mechanical surface textures are preserved primarily as flat cleavage surfaces and rounded edges inherited from fluvial-intertidal and aeolian transport, respectively. Mechanically/chemically induced surface textures are preserved as elongated depressions. Chemical surface textures are sparse and mostly represented by mammillated textures that suggest local dissolution under subaqueous conditions. The scarcity of chemical surface textures is attributed to frequent fragmentation of the clinopyroxenes along cleavages and limited chemical weathering during transport of the observed populations. Clinopyroxene grains in the coastal dune sands primarily retain surface characteristics from fluvial transport. Although the breakage of minerals along cleavages can obscure their original morphology under a weathering-limited erosion regime, this study shows how surface textures and morphology of pyroxene grains is used to determine episodes of transport and deposition close to volcanic environments. The use of the compactness property as a shape descriptor measurement of particles provides an alternative approach to observe how clinopyroxene remains unaltered despite the high energy conditions of the coastal area.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 4","pages":"789-809"},"PeriodicalIF":2.4,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.228","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42733971","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":"Carbonate diagenesis: A celebration of the work of John Anthony Dawson (Tony) Dickson","authors":"V. P. Wright,&nbsp;A. Saller,&nbsp;R. Wood","doi":"10.1002/dep2.226","DOIUrl":"10.1002/dep2.226","url":null,"abstract":"<p>Magnesian Limestone zoned dolomite (red and non-luminescent zones) now partly dedolomitized), calcite (yellow luminescence), blue luminescent albite has non-luminescent overgrowths) Mansfield Quarry, Nottinghamshire. Photo credit: J.A.D. Dickson. \u0000 <figure>\u0000 <div><picture>\u0000 <source></source></picture><p></p>\u0000 </div>\u0000 </figure></p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"9 3","pages":"406-412"},"PeriodicalIF":2.4,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.226","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42452721","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":"Lateral variations in the signature of earthquake-generated deposits in Lake Iznik, NW Turkey","authors":"R. Gastineau,&nbsp;P. Sabatier,&nbsp;S. C. Fabbri,&nbsp;F. S. Anselmetti,&nbsp;P. Roeser,&nbsp;N. Findling,&nbsp;M. Şahin,&nbsp;S. Gündüz,&nbsp;F. Arnaud,&nbsp;S. O. Franz,&nbsp;N. D. Ünsal,&nbsp;J. de Sigoyer","doi":"10.1002/dep2.232","DOIUrl":"10.1002/dep2.232","url":null,"abstract":"<p>Using lake-sediment cores to document past seismicity requires a comprehensive understanding of possible lateral variations in depositional processes. This study aims to reveal the lateral variations in earthquake-induced event deposits throughout Lake Iznik, a large lake located on the middle strand of the North Anatolian Fault. Based on stratigraphic, sedimentological and geochemical analyses of 14 sediment cores from two subbasins across the lake, five different types of event deposits (T1–T5) were identified and characterised. One event deposit type (T5) is restricted to a delta mouth, characterised by the occurrence of authigenic Fe-Mn carbonates and interpreted to result from flood events. The four other types of event deposits are characterised by their synchronicity between cores and their age consistency with historical earthquakes and are interpreted to be likely generated by earthquakes. The locally prominent 1065 CE historical earthquake that ruptured the sub-lacustrine Iznik Fault produced at least three different types of event deposits. One deposit type (T2) is only observed for this very local earthquake, implying that the type of event deposit might also depend on ground-motion parameters. At the lake scale, the occurrence of various event deposits depends on the flow distance from the source of sediment destabilisations to the coring site.</p>","PeriodicalId":54144,"journal":{"name":"Depositional Record","volume":"10 5","pages":"470-495"},"PeriodicalIF":1.9,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/dep2.232","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47959490","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}