Marine Geology最新文献_第9页

Chicxulub impact tsunami megaripples, imaged in 3D seismic data: Distribution and characteristics on the northern Gulf of Mexico shelf and slope 希克苏鲁伯撞击海啸巨涟漪，三维地震数据成像：墨西哥湾北部大陆架和斜坡的分布和特征

IF 2.6 3区地球科学

Marine Geology Pub Date : 2025-01-19 DOI: 10.1016/j.margeo.2024.107466

Gary L. Kinsland , Rui Zhang , Rika Burr , Stephen Klug

{"title":"Chicxulub impact tsunami megaripples, imaged in 3D seismic data: Distribution and characteristics on the northern Gulf of Mexico shelf and slope","authors":"Gary L. Kinsland , Rui Zhang , Rika Burr , Stephen Klug","doi":"10.1016/j.margeo.2024.107466","DOIUrl":"10.1016/j.margeo.2024.107466","url":null,"abstract":"<div><div>Kinsland et al. (2021) presented images of megaripples derived from 200 sq. km (77 sq. mi) of petroleum industry 3D seismic data from the paleoshelf of central Louisiana, United States of America. The megaripples are interpreted to be the result of the Chicxulub Impact about 66 million years ago, the Cretaceous/Paleogene boundary. To investigate the presence and morphology of megaripples both farther up the paleoshelf and down over the paleoshelf edge onto the paleoslope we have obtained access to and have interpreted over 2400 sq. km (900 sq. mi) of additional 3D seismic data. Megaripples exist everywhere in the data investigated upon/within the, once, fluidized marl muds of a mass transport deposit which was mobilized by Rayleigh waves from the Chicxulub Impact, about an hour before the tsunami reached the northern Gulf of Mexico (Louisiana). We propose that the megaripples were formed in these thixotropic muds by fluid traction of the tsunami in much the same way that water waves are formed by the traction of wind and the forms persisted in the muds as the tsunami waned. We outline how studies similar to ours might lead to better understanding of tsunami effects and dangers in general and in those from tsunami resulting from oceanic impacts.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107466"},"PeriodicalIF":2.6,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177758","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}

引用次数: 0

Study on the morphodynamic response of reef flat with moveable bed to monochromatic waves 可动床礁滩对单色波浪的形态动力学响应研究

IF 2.6 3区地球科学

Marine Geology Pub Date : 2025-01-17 DOI: 10.1016/j.margeo.2025.107479

Yu Yao , Zhangyan Li , Zhongwei Zhao , Long Chen , Baobao Zhou , Xiuqi Han

{"title":"Study on the morphodynamic response of reef flat with moveable bed to monochromatic waves","authors":"Yu Yao , Zhangyan Li , Zhongwei Zhao , Long Chen , Baobao Zhou , Xiuqi Han","doi":"10.1016/j.margeo.2025.107479","DOIUrl":"10.1016/j.margeo.2025.107479","url":null,"abstract":"<div><div>While carbonate sediment transport processes over coral reefs have been extensively investigated in the past decade，very few studies have focused on the morphodynamic response of sandy reef flats to wave action. In this study, a set of innovative wave-flume laboratory experiments was conducted for the first time to investigate the evolution of reef flat based on a barrier reef profile. Various monochromatic wave conditions (incident wave height, incident wave period and initial reef-flat water level) and sediment layer thicknesses were tested. A sand layer was paved on the reef flat to simulate a moveable bed and the reef surface roughness was replicated using an array of cylinders. Subsequently, a phase-resolving non-hydrostatic model (XBeach-NH) was adopted to simulate both the hydrodynamic and morphodynamic processes in the reef environment. A vegetation module was incorporated into Xbeach-NH to represent the rough reef surface. The adopted model was validated against the laboratory dataset for the first time as reported in this study. It was then used to examine the impacts of varying fore-reef slopes, sediment grain sizes and reef surface roughness on the morphodynamic response of sandy reef flats to monochromatic wave action. Model outputs suggested that projected sea-level rise, reduced reef surface roughness and increased storminess due to climate change have profound impacts on the morphodynamic processes on the reef flat thus may eventually contribute the geomorphological sustainability of reef islands.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107479"},"PeriodicalIF":2.6,"publicationDate":"2025-01-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177305","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}

引用次数: 0

Rapid, complex back barrier pedestal formation preconditions washover deposition on the southeast Indian coast 快速、复杂的后屏障台地形成是东南印度海岸冲蚀沉积的先决条件

IF 2.6 3区地球科学

Marine Geology Pub Date : 2025-01-16 DOI: 10.1016/j.margeo.2025.107477

Chris Gouramanis , Seshachalam Srinivasalu , Andasabari Karthik , Dat T. Pham , Stephen Carson , Adam D. Switzer

{"title":"Rapid, complex back barrier pedestal formation preconditions washover deposition on the southeast Indian coast","authors":"Chris Gouramanis , Seshachalam Srinivasalu , Andasabari Karthik , Dat T. Pham , Stephen Carson , Adam D. Switzer","doi":"10.1016/j.margeo.2025.107477","DOIUrl":"10.1016/j.margeo.2025.107477","url":null,"abstract":"<div><div>Washover deposits formed by overwash are important deposits for evaluating the stratigraphy and evolution of coastal environments. Examination of preserved washover fans can provide a palaeotempestological record that inform past and recent coastal risk with a view to predicting future coastal risk. The recognition of past washover deposits in coastal systems requires detailed knowledge of the internal structure of recent deposits including washover fans. We used very high frequency Ground Penetrating Radar and satellite imagery to examine the internal architecture of the 31st December 2011 Cyclone Thane surge-generated washover deposit on the beach that blocked the Thenpennai River at Thazhamkuda, near Cuddalore in Tamil Nadu Province, southeastern India. Cyclone Thane overwash overtopped the beach and deposited sediments on the contemporary beach and behind the beach within the former channel of the blocked river. The modern washover fan thus contains sediments that are preserved subaqueously and subaerially. We demonstrate that the internal architecture of the fan at Thazhamkuda is largely controlled by the pre-existing topography, and erosional and depositional processes as the cyclone washed sediment inland. At the landward margin of the fan, terminal foreset bedding is preserved and is likely to be one of the only features that can discriminate storm over tsunami deposits.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107477"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177754","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}

引用次数: 0

Surfzone-beach-dune interactions on the Chinese coasts 中国海岸的冲浪带-海滩-沙丘相互作用

IF 2.6 3区地球科学

Marine Geology Pub Date : 2025-01-16 DOI: 10.1016/j.margeo.2025.107480

Wei Tian , Yuxiang Dong , Shuyi Fu , Shaoyun Zhang , Dequan Huang , Lin Yang

{"title":"Surfzone-beach-dune interactions on the Chinese coasts","authors":"Wei Tian , Yuxiang Dong , Shuyi Fu , Shaoyun Zhang , Dequan Huang , Lin Yang","doi":"10.1016/j.margeo.2025.107480","DOIUrl":"10.1016/j.margeo.2025.107480","url":null,"abstract":"<div><div>Wave-beach-dune interactions are essential in investigating coastal aeolian landforms and have attracted decades of research effort. As the conceptual models were proposed and improved, case studies have been explored in-depth, indicating that beach and dune interactions exhibit significant spatial heterogeneity across tidal and wave environments. In this study, sixty-five coastal dune systems along China's coasts are investigated to explore the variability of surfzone-beach-dune interactions along the Chinese coasts and the underpinning mechanisms. A dataset comprising wave height, tidal range, Drift Potential, and beach-dune morphology is established based on interpretations of historical topographical and bathymetric maps, field survey investigations, and monitoring data for waves, tides, and winds. Classifications of surfzone/beach morphodynamics and dune morphology relationships at macro-, meso-, and micro-tide levels are presented, with mechanisms clarified through linear regression analysis between dune height and various environmental variables. Our results show that modal surfzone-beach states in the studied sites are correlated with dune sizes. Spring tidal range influences surfzone-beach state by providing a potentially greater storage space for aeolian sediment transport as tidal range increases. Wave energy acts as a clear driver of onshore sediment transport, with higher wave energy and more dissipative surfzone states correlated with greater sediment supply. Additionally, shoreline orientation and exposure to onshore winds control the occurrences of foredunes. The outcomes of this work provide an overview on the relationships between surfzone/beach and dune systems across the different tidal regimes along Chinese coast. Our dataset and results will provide a scientific basis for evaluating the vulnerability of dune system to hazards impacting the coasts.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107480"},"PeriodicalIF":2.6,"publicationDate":"2025-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177306","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}

引用次数: 0

Development shifts on the emerging Järve coast (Estonia) in Late Holocene 晚全新世新兴Järve海岸（爱沙尼亚）的发展转变

IF 2.6 3区地球科学

Marine Geology Pub Date : 2025-01-15 DOI: 10.1016/j.margeo.2025.107478

Katre Luik , Hannes Tõnisson , Reimo Rivis , Kadri Vilumaa , Tiit Vaasma , Egert Vandel , Toru Tamura , Ülo Suursaar

{"title":"Development shifts on the emerging Järve coast (Estonia) in Late Holocene","authors":"Katre Luik , Hannes Tõnisson , Reimo Rivis , Kadri Vilumaa , Tiit Vaasma , Egert Vandel , Toru Tamura , Ülo Suursaar","doi":"10.1016/j.margeo.2025.107478","DOIUrl":"10.1016/j.margeo.2025.107478","url":null,"abstract":"<div><div>This study identifies a sequence of accretional paleospits and beach ridges at the Järve coast, which developed over the past 4000 years (4 ka) mostly through coastal progradation and land emergence driven by glacial isostatic adjustment (GIA). Using optically stimulated luminescence dating, LiDAR elevation data, historical cartography, and recent instrumental metocean forcing data, we analyze the historical developments in relative sea level (RSL) and major shifts in the region's geomorphology from the Mid- to Late-Holocene. From 7.3 to 4 ka, the GIA induced uplift with local rate of about 2.2 mm/a facilitated land emergence and the formation of the Järve shoal which was exposed to storms from west, south and east; from 4 to 3 ka, the shoal evolved into a sandy island with spits; between 3 and 1.5 ka, the barrier island became connected with the Saaremaa mainland while the still emerging paleospits distanced from the sea. From 1.5 ka to 1850 CE, westerly forces were cut off; cooling climate during the Little Ice Age and tree logging facilitated formation of nearshore dune belt. In the mid-20th century, a reversal in RSL occurred, as the global sea level rise exceeded the local uplift. Concurrently to the Baltic Sea winter ice extent decrease, Järve ice days have reduced by 46 % from 1750 to 2023 CE. This reduction has exposed the coast to increased wave energy and storm surges from winter storms, resulting in an approximate 85-m shoreline recession at Järve and sediment accumulation near downdrift Nasva port.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107478"},"PeriodicalIF":2.6,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177304","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}

引用次数: 0

Influence of the density stratification on the vertical distribution of suspended sediment in a partially mixed estuary 密度分层对部分混合河口悬浮物垂直分布的影响

IF 2.6 3区地球科学

Marine Geology Pub Date : 2024-12-22 DOI: 10.1016/j.margeo.2024.107461

Yajun Wang , Chenjuan Jiang , Heqin Cheng , Huayang Cai , Weihua Li , Lizhi Teng

{"title":"Influence of the density stratification on the vertical distribution of suspended sediment in a partially mixed estuary","authors":"Yajun Wang , Chenjuan Jiang , Heqin Cheng , Huayang Cai , Weihua Li , Lizhi Teng","doi":"10.1016/j.margeo.2024.107461","DOIUrl":"10.1016/j.margeo.2024.107461","url":null,"abstract":"<div><div>The North Passage of the Changjiang Estuary, also known as the Yangtze Estuary, is a typical partially mixed estuary exhibiting significant variations in density stratification across different reaches. These stratification-induced variations in the vertical profiles of suspended sediment concentration (SSC) significantly impact sediment transport and the trapping of sediment at the estuarine turbidity maximum. This study analyzes multi-site hydrological and sediment data collected in the North Passage during the wet season of 2016, using mathematical and statistical methods to quantitatively assess how density stratification suppresses turbulence and influences SSC profiles, with the hypothesis that density is controlled by salinity. Results indicate that under non-stratified conditions, SSC profiles generally exhibit a linear distribution pattern with minimal variation in vertical gradients. While under stratified conditions, SSC becomes more concentrated near the bottom, resulting in exponential SSC profiles. Under stratified conditions, models assuming vertically uniform eddy diffusivity, which account for the suppression of turbulence by stratification, yield SSC profiles that agree well with measured SSC profiles in the North Passage, highlighting the critical role of stratification in influencing sediment dynamics in estuarine environments.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"481 ","pages":"Article 107461"},"PeriodicalIF":2.6,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143177759","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}

引用次数: 0

Channel function shift around a recently-colonised estuarine mangrove shoal 在最近被殖民的河口红树林浅滩周围，河道功能发生了变化

IF 2.6 3区地球科学

Marine Geology Pub Date : 2024-11-26 DOI: 10.1016/j.margeo.2024.107440

Amin Rahdarian , Karin R. Bryan , Mick Van Der Wegen

{"title":"Channel function shift around a recently-colonised estuarine mangrove shoal","authors":"Amin Rahdarian , Karin R. Bryan , Mick Van Der Wegen","doi":"10.1016/j.margeo.2024.107440","DOIUrl":"10.1016/j.margeo.2024.107440","url":null,"abstract":"<div><div>Large sediment loading to the coast can accelerate estuarine infilling, which promotes the establishment of salt marsh or mangroves. Bio-geomorphic feedback ensues where channels and shoals gradually evolve in tandem as the vegetation gains a foothold. The aim of this work is to explore the governing dynamics of a recently evolving estuarine, mangrove-covered channel-shoal system in Whitianga Estuary, Aotearoa New Zealand. Observations of water level, flow velocity, suspended sediment concentration (SSC) and bed sediment characteristics were used to infer flow asymmetry and sediment transport pathways around the shoal. Historical images were combined with the measurements to qualitatively link the observed, short-term processes to the influence of expanding vegetation on multi-decadal evolution. Comparisons of flow asymmetry in two contrasting drainage channels (in close proximity) on the shoal show that rapid colonisation by mangroves can quickly change the flow asymmetry from flood to ebb dominant. Mangroves opportunistically colonise the higher ground at the centre of the shoal. Meanwhile they become eco-engineers creating their own environment as evidenced by the abrupt change in the sediment textural environment, even outside the immediate area of new vegetation. Although many studies have focused on spatial flow patterns associated with mangrove vegetation, our observations show evidence of the speed at which colonisation fuels geomorphologic change.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"479 ","pages":"Article 107440"},"PeriodicalIF":2.6,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747096","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}

引用次数: 0

The eastward intrusion of the Lena River into the East Siberian Sea since the early Holocene 全新世早期以来的勒拿河东侵东西伯利亚海

IF 2.6 3区地球科学

Marine Geology Pub Date : 2024-11-26 DOI: 10.1016/j.margeo.2024.107436

Kunshan Wang , Xuefa Shi , Zhengquan Yao , Aleksandr A. Bosin , Qiuling Li , Shuqing Qiao , Anatolii S. Astakhov , Jiang Dong

{"title":"The eastward intrusion of the Lena River into the East Siberian Sea since the early Holocene","authors":"Kunshan Wang , Xuefa Shi , Zhengquan Yao , Aleksandr A. Bosin , Qiuling Li , Shuqing Qiao , Anatolii S. Astakhov , Jiang Dong","doi":"10.1016/j.margeo.2024.107436","DOIUrl":"10.1016/j.margeo.2024.107436","url":null,"abstract":"<div><div>The sedimentary environments and material sources of the eastern and northeastern Lena Delta differ in coarse-grained components and garnet geochemistry, particularly in the Buor-Khaya Bay, where the material composition is primarily influenced by the Lena River, while the Yana Bay sediment is controlled by the Yana River. Analysis of detrital minerals in core LV83–32-3, located in northern Yana Bay, indicates dominant primarily fluvial input from the Yana River, with secondary contributions from the Lena River and minor inputs from coastal permafrost erosion since the early Holocene. During the sea-level rise period from 8.5 to 5 ka, four significant fluvial discharge events from the Yana River were identified, marked by high mica contents, associated with multiple climate warming events. From ∼5 to 1.6 ka, an increasing Lena River runoff transported coastal permafrost material via river flow or river ice, evident in a gradual rise in plagioclase content. After 1.6 ka, a sharp decrease in hypersthene and garnet contents suggests reduced Lena River discharge, coinciding with a similar decline in hypersthene content in the core of the East Siberian Sea since 1.8 ka. Two prominent Lena River fluvial events, dated to 7.1 and 3.7 ka, are identified by the event layers containing minerals typical of the Lena River, rich in hypersthene, garnet and zircon, along with substantial coarse-grained debris such as quartz, plagioclase, siderite and clayey tubes. These two events are also recorded in the East Siberian Sea. The 7.1 ka discharge event may coincide with the separation of the New Siberian Islands from the mainland, while the 3.7 ka event represents a widely distributed Lena River floodplain event.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"479 ","pages":"Article 107436"},"PeriodicalIF":2.6,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747097","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}

引用次数: 0

Reduced bottom water oxygenation in the northern Indian Ocean during the Last Glacial Maximum 末次冰川极盛期印度洋北部底层水含氧量降低

IF 2.6 3区地球科学

Marine Geology Pub Date : 2024-11-19 DOI: 10.1016/j.margeo.2024.107437

Kumari Nisha , Sushant Suresh Naik

{"title":"Reduced bottom water oxygenation in the northern Indian Ocean during the Last Glacial Maximum","authors":"Kumari Nisha , Sushant Suresh Naik","doi":"10.1016/j.margeo.2024.107437","DOIUrl":"10.1016/j.margeo.2024.107437","url":null,"abstract":"<div><div>Reconstructing variations in the past bottom water oxygenation of the oceans is crucial for understanding the current global ocean deoxygenation and increased respired carbon storage. Changes in the deep water circulation have significantly influenced the oxygenation conditions of bottom water in the past. This study tracks the changes in bottom water oxygenation and carbonate dissolution in the northern Indian Ocean for the past 25 kyr BP using a multi-proxy record of surface porosity of epifaunal benthic foraminifera <em>Cibicidoides wuellerstorfi</em>, foraminiferal fragmentation percentage, CaCO<sub>3</sub> content, size index, and authigenic uranium concentration in sediments, from a gravity core SSD-044/GC-01 recovered from a water depth of 3160 m. Results suggest that during the Last Glacial Maximum (LGM) and the Heinrich Stadial 1 (HS1), low-O<sub>2</sub> and CO<sub>2</sub>-rich deep water mass existed in the northern Indian Ocean, probably due to an increased proportion of southern sourced Antarctic Bottom Water (AABW) at the core location, which indicates increased respired carbon storage in the deep water of the northern Indian Ocean, suggesting it was part of a large carbon reservoir. At the onset of the Bølling-Allerød (at around ∼14.5 kyr BP), there was an incursion of O<sub>2</sub>-rich and CO<sub>2</sub>-poor NADW at the core site. Furthermore, a well‑oxygenated deep water mass prevailed in the northern Indian Ocean during the Holocene.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"479 ","pages":"Article 107437"},"PeriodicalIF":2.6,"publicationDate":"2024-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719745","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}

引用次数: 0

Origin and critical metals enrichment of ferromanganese precipitates from Jiawang Seamount (Hook Ridge) Antarctica: Geochemistry and isotope evidence 南极贾汪海山（虎克海脊）铁锰沉淀物的起源和临界金属富集：地球化学和同位素证据

IF 2.6 3区地球科学

Marine Geology Pub Date : 2024-11-17 DOI: 10.1016/j.margeo.2024.107435

Hao Zhang , Yingchun Cui , Shi Zong , Shaocong Chen , Lijie Ma , Weixuan Wang , Xuejiao Wang , Shenggui Li , Chenguang Liu

{"title":"Origin and critical metals enrichment of ferromanganese precipitates from Jiawang Seamount (Hook Ridge) Antarctica: Geochemistry and isotope evidence","authors":"Hao Zhang , Yingchun Cui , Shi Zong , Shaocong Chen , Lijie Ma , Weixuan Wang , Xuejiao Wang , Shenggui Li , Chenguang Liu","doi":"10.1016/j.margeo.2024.107435","DOIUrl":"10.1016/j.margeo.2024.107435","url":null,"abstract":"<div><div>Marine ferromanganese precipitates are globally recognized as significant minerals resources within the world's oceans. Our study presents an analysis of isotopic geochemistry of ferromanganese precipitates from the Jiawang Seamount in Antarctica, comparing them with typical low-temperature hydrothermal ferromanganese precipitates found in oceanic settings. We discuss the genesis of ferromanganese precipitates and the characteristics of critical metals' enrichment. The chemical compositions imply that the ferromanganese precipitates from Jiawang Seamount are of hydrothermal origin. However, the enrichment characteristics of critical metals such as Co, Ni, Cu, Zn, Mo, Pb, REE, aside from Fe and Mn, are not conspicuous and possess relatively inferior potential compared with typical hydrothermal ferromanganese precipitates in the oceans. These critical metals originate from hydrothermal fluid, and their enrichment is positively correlated with the precipitation process of Mn oxides. The Sr isotope results reveal that the formation of ferromanganese precipitates underwent at least two distinct periods of hydrothermal activity, respectively at 9.5 Ma and 15–16 Ma. The chemical composition and Nd - Pb isotopic characteristics of ferromanganese precipitates suggest that the hydrothermal fluid composition is substantially similar during different periods. The formation of ferromanganese precipitates from Jiawang Seamount is closely related to regional hydrothermal activities that accompany basin development. Based on the Sr isotope estimation of hydrothermal activity, the Bransfield Strait basin is at least older than 16 Ma.</div></div>","PeriodicalId":18229,"journal":{"name":"Marine Geology","volume":"479 ","pages":"Article 107435"},"PeriodicalIF":2.6,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142719744","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}

引用次数: 0