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Onshore flow characteristics of the 1755 CE Lisbon tsunami: Linking forward and inverse numerical modeling Mar. Geol. (IF 3.04) Pub Date : 2021-01-22 Ivana Bosnic; Pedro J.M. Costa; Francisco Dourado; SeanPaul La Selle; Guy Gelfenbaum
The 1755 CE Lisbon earthquake triggered the largest historical tsunami ever impacting the Atlantic coasts of Europe. Despite recent efforts to better understand this event, there are still unanswered questions about the location of its epicenter and whether physical and historical evidences are in agreement. Inverse modeling using tsunami sediments can be applied to quantify onshore flow characteristics
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Extreme floods of the Changjiang River over the past two millennia: Contributions of climate change and human activity Mar. Geol. (IF 3.04) Pub Date : 2021-01-05 Liang Zhou; Yong Shi; Yaqing Zhao; Yang Yang; Jianjun Jia; Jianhua Gao; Ya Ping Wang; Zhanhai Li; Yuzhu Zhang; Yongqiang Guo; Benwei Shi; Shu Gao
Climate change and human activity have exerted significant influences on the sediment load and channel morphology of the Changjiang River system, China. However, our knowledge of their influence on flood regime on the centennial to millennial timescales remains limited, and this is mainly because of the difficulty in directly determining the long-term hydrological variability of the Changjiang River
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Fault-controlled contourite drifts in the southern South China Sea: Tectonic, oceanographic, and conceptual implications Mar. Geol. (IF 3.04) Pub Date : 2021-01-10 Shan Liu; F. Javier Hernández-Molina; Zhenyu Lei; Débora Duarte; Hui Chen; Ce Wang; Yaping Lei; Haiteng Zhuo; Shuqin Huang; Li Zhang; Ming Su
Over the past decades, contourite drifts have been widely identified in the deep ocean with their classification constantly being improved. Some contourite drift types, however, are not yet well constrained. The present study investigates contourite drifts in the southern South China Sea for the first time based on high-resolution reflection seismic profiles and bathymetric data, thereby determining
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Sedimentary evolution of a delta-margin mangrove in Can Gio, northeastern Mekong River delta, Vietnam Mar. Geol. (IF 3.04) Pub Date : 2021-01-04 D.S. Collins; V.L. Nguyen; T.K.O. Ta; L. Mao; Y. Ishii; H. Kitagawa; R. Nakashima; T.H.Q. Vo; T. Tamura
Mangroves can deliver important socio-economic benefits and store significant volumes of carbon along tropical to temperate coastlines, but the distribution is controlled by complex geomorphologic, hydrodynamic and salinity conditions, as well as human-related pressures. In the Mekong delta, the interaction of tide, wave and riverine hydrodynamic processes clearly impacts sedimentation and mangrove
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Noble gases in sediment pore water yield insights into hydrothermal fluid transport in the northern Guaymas Basin Mar. Geol. (IF 3.04) Pub Date : 2021-01-15 E. Horstmann; Y. Tomonaga; M.S. Brennwald; M. Schmidt; V. Liebetrau; R. Kipfer
We present noble gas concentrations determined in pore water of deep-sea sediments close to a recently discovered hydrothermal vent site, consisting of a mound structure and several black smokers, located in the northern Guaymas Basin, Gulf of California. Noble gases were used as tracers to identify the origin of fluids within the sediment pore space and to gain insight into transport dynamics of hydrothermal
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Seismic record of a cyclic turbidite-contourite system in the Northern Campos Basin, SE Brazil Mar. Geol. (IF 3.04) Pub Date : 2021-01-13 Bruna Teixeira Pandolpho; Antonio Henrique da Fontoura Klein; Isadora Dutra; Michel M. Mahiques; Adriano R. Viana; Gilmar Vital Bueno; Arthur Antonio Machado; Yuri L. Camargo; Cízia M. Hercos; Yhaohannah Lima; Antonio Fernando H.F. Filho; Carlos E. Theodoro
A new mixed turbidite-contourite system is described in the northern Campos Basin, southeastern Brazilian margin. Depositional cycles were differentiated based on diagnostic seismic features. Seismic attributes, seismic facies, and isochron maps were used to identify alternating cycles of downslope and alongslope processes in the study area. Seismic units were then associated with the dominant type
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Latest Pleistocene to Holocene stratigraphic record and evolution of the Paleo-Mekong incised valley, Vietnam Mar. Geol. (IF 3.04) Pub Date : 2020-12-24 Thi Kim Oanh Ta; Van Lap Nguyen; Yoshiki Saito; Marcello Gugliotta; Toru Tamura; Thi Mong Lan Nguyen; Minh Hoang Truong; Thi Luan Bui
Recent 200+ km progradation of the Mekong River delta over the last 6000 years has provided a sequence of incised-valley fills with insights into the sedimentary response of a large river system to sea-level changes since the Last Glacial Maximum (LGM). This study provides an analysis of comprehensive synthesis of the incised-valley and successive progradational deposits of the paleo-Mekong River across
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Relationships between volcanism and plate tectonics: A case-study from the Canterbury Basin, New Zealand Mar. Geol. (IF 3.04) Pub Date : 2020-12-27 A. Barrier; A. Bischoff; A. Nicol; G.H. Browne; K.N. Bassett
Buried volcanoes and igneous intrusions of Cretaceous to Pleistocene age are widespread in the Canterbury Basin, New Zealand. Interpretation of 2D and 3D seismic reflection lines correlated to petroleum exploration wells reveal over 185 buried volcanic systems formed in association with tectonic activity since the separation of Zealandia from Eastern Gondwana. We characterise these volcanoes according
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A chronology of post-glacial mass-transport deposits on the Canadian Beaufort Slope Mar. Geol. (IF 3.04) Pub Date : 2021-01-10 M. Riedel; E.L. King; G.D.M. Cameron; S. Blasco; K.W. Conway; S.R. Dallimore; K.M.M. Rohr; Y.K. Jin; J.K. Hong
Extent and chronology of 24 buried and seabed-exposed mass transport deposits (MTDs) on the continental slope of the Canadian Beaufort Sea were compiled towards a regional geo-hazard assessment of the Beaufort region. A total of 2220 lines of 3.5 kHz sub-bottom profiler (SBP) data (~40,000-line kilometres) covering an area of 9740 km2 were analyzed to allow a new understanding of slope instability
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Coastal chalk cliff retreat rates during the Holocene, inferred from submarine platform morphology and cosmogenic exposure along the Normandy coast (NW France) Mar. Geol. (IF 3.04) Pub Date : 2020-12-25 Timothée Duguet; Anne Duperret; Stéphane Costa; Vincent Regard; Grégoire Maillet
Submerged marine terraces potentially provide crucial information on past sea-level variations and paleo-coastline locations that may be used to estimate long-term coastal erosion rates. The Normandy coastline has recently been surveyed using a shallow water high-resolution mapping system. We identified a new continuous submarine platform, called the inner platform, limited by a shore parallel edge
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Regime shifts in the Changjiang (Yangtze River) Estuary: The role of concentrated benthic suspensions Mar. Geol. (IF 3.04) Pub Date : 2021-01-02 Jianliang Lin; Bram C. van Prooijen; Leicheng Guo; Chunyan Zhu; Qing He; Zheng Bing Wang
Channel deepening often triggers positive feedback between tidal deformation, sediment import and drag reduction, which leads to the regime shift in estuaries from low-turbid to hyper-turbid state. In this study, a transition in profiles of suspended sediment concentration (SSC) is hypothesised by including a positive feedback loop of vertical mixing and settling. Such a hypothesis is validated by
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Stratigraphic framework and sediment wave fields associated with canyon-levee systems in the Huatung Basin offshore Taiwan Orogen Mar. Geol. (IF 3.04) Pub Date : 2020-12-26 Ho-Han Hsu; Char-Shine Liu; Tzu-Ting Chen; Hau-Ting Hung
Newly compiled bathymetry, sub-bottom profiling and seismic data are used to illustrate seafloor morphology, submarine canyon networks and stratigraphic framework in Huatung Basin (HB) and an adjacent sub-basin, named as East Luzon Arc Basin offshore east Taiwan. Based on seismic facies characteristics and isopach maps, three major stratigraphic sequences are recognized and we suggest that they could
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Half a century of morphological change in the Haringvliet and Grevelingen ebb-tidal deltas (SW Netherlands) - Impacts of large-scale engineering 1964–2015 Mar. Geol. (IF 3.04) Pub Date : 2020-12-21 Ad J.F. van der Spek; Edwin P.L. Elias
The damming of the estuaries Brielse Maas, Haringvliet and Grevelingen in the SW Netherlands, distributaries of the rivers Rhine and Meuse, caused large-scale morphodynamic changes in their respective ebb-tidal deltas that continue until today. The strong reduction of the cross-shore tidal flow triggered erosion of the ebb-delta front, the building of a coast-parallel, linear intertidal sand bar at
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Physical processes controlling mud depocenter development on continental shelves – Geological, oceanographic, and modeling concepts Mar. Geol. (IF 3.04) Pub Date : 2020-12-29 Lucas Porz; Wenyan Zhang; Till J.J. Hanebuth; Corinna Schrum
Mud depocenters (MDCs) represent major proximal-marine sinks for fine-grained terrigenous material, carbon, and contaminants on modern continental shelves. Throughout the past decades, several studies have shed light on the physical processes controlling MDC development at various timescales, ranging from controlled flume experiments and in-situ oceanographic monitoring, to stratigraphic analyses of
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Embayment morphometrics, granulometry and carbonate mineralogy of sandy beaches in the Maltese Islands Mar. Geol. (IF 3.04) Pub Date : 2020-12-11 Peter Gatt
The beach and shoreface sediments in the Maltese Islands have accumulated in under-filled accommodation space conditions like many temperate and tropical island carbonate beach and shelf environments. Nevertheless, Maltese beach sediments show anomalously low biogenic carbonate content compared to other carbonate beaches. Fourteen carbonate sandy beaches in the Maltese Islands were sampled to examine
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Inter-comparison of optically stimulated luminescence (OSL) ages between different fractions of Holocene deposits from the Yangtze delta and its environmental implications Mar. Geol. (IF 3.04) Pub Date : 2020-12-19 Xiaomei Nian; Weiguo Zhang; Zhanghua Wang; Qianli Sun; Zhongyuan Chen
In fluvial and deltaic environments, different grain-size fractions experience varying degrees of bleaching of OSL signals due to variations in hydrodynamics and depositional processes. This has led to ambiguity for selection of grain-size fraction suitable for OSL dating. Comparison of OSL results from multiple grain-size fractions is one approach to ensure the reliability of OSL ages. We determined
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A diatom-based Holocene record of sedimentary and oceanographic environmental changes within the Beibu Gulf, NW South China Sea Mar. Geol. (IF 3.04) Pub Date : 2020-12-08 Jinpeng Zhang; Michal Tomczak; Andrzej Witkowski; Kai Liang; Jan Harff; Chao Li; Bing Wang
A sediment core from a nearshore setting (10.8 m in water depth) of the inner Beibu Gulf, northwestern South China Sea, was analyzed in terms of diatom assemblage composition, grain size distribution and radiocarbon dating, with aim to describe sedimentary and oceanographic environmental changes during the Holocene. The fossil diatom record and changes in granulometry reveal that sea-level fluctuations
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Paleoenvironmental implications of Sr and Nd isotopes variability over the past 48 ka from the southern Sea of Japan Mar. Geol. (IF 3.04) Pub Date : 2020-12-02 Jianjun Zou; Xuefa Shi; Aimei Zhu; Lianhua He; Selvaraj Kandasamy; Ralf Tiedemann; Lester Lembke-Jene; Fengdeng Shi; Xun Gong; Yanguang Liu; Minoru Ikehara; Pai-Sen Yu
Millennial scale variations of terrigenous provenance in marine realm are closely related to regional environment and climate changes. Therefore, a wealth of information of past environment and climate can be constrained via fingerprinting sediment provenance. The Sea of Japan is a unique marginal sea in the North Pacific due to its high sill and distinct thermohaline circulation. The modern hydrography
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Submarine morphology of the Comoros volcanic archipelago Mar. Geol. (IF 3.04) Pub Date : 2020-12-04 A. Tzevahirtzian; S. Zaragosi; P. Bachèlery; L. Biscara; E. Marchès
A detailed morpho-bathymetric study of the Comoros archipelago, based on mostly unpublished bathymetric data, provides a first glimpse into the submarine section of these islands. It offers a complete view of the distribution of volcanic structures around the archipelago, allowing to discuss the origin and evolution of this volcanism. Numerous volcanic cones and erosional-depositional features have
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Deep learning model for seabed sediment classification based on fuzzy ranking feature optimization Mar. Geol. (IF 3.04) Pub Date : 2020-12-03 Xiaodong Cui; Fanlin Yang; Xin Wang; Bo Ai; Yu Luo; Dan Ma
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High-resolution depositional records of lead isotopes and polycyclic aromatic hydrocarbons in the Bohai Sea, China: Implications for a sediment footprint of anthropogenic impact Mar. Geol. (IF 3.04) Pub Date : 2020-12-14 Bin Chen; Limin Hu; Jihua Liu; Yazhi Bai; Hui Zhang; Bin Wu; Jian Liu; Zhigang Guo
Mercury (Hg), Lead (Pb) and its stable isotopes and polycyclic aromatic hydrocarbons (PAHs) were analyzed in a sediment box core obtained from the central Bohai Sea (BS) of northern China to trace anthropogenic input for the past century. The records of Hg, PAHs and Pb isotopic ratios revealed that the BS was clearly impacted by human activities from the early 1930s to the middle 1940s, possibly related
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Influence of antecedent geology on the Holocene formation and evolution of Horn Island, Mississippi, USA Mar. Geol. (IF 3.04) Pub Date : 2020-10-29 Nina S. Gal; Davin J. Wallace; Michael D. Miner; Robert J. Hollis; Clayton Dike; James G. Flocks
Horn Island, one of the two most stable barriers along the Mississippi-Alabama chain (Cat, East and West Ship, Horn, West Petit Bois, Petit Bois, and Dauphin), provides critical habitat, helps regulate estuarine conditions in the Mississippi Sound, and reduces wave energy and storm surge before they reach the mainland shore. However, important details of the formation and evolution of the island in
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Morphodynamics of intertidal dune field in a mixed wave-tide environment: Case of Baie de Somme in Eastern English Channel Mar. Geol. (IF 3.04) Pub Date : 2020-11-18 Imen Turki; Sophie L.E. Bot; Nicolas Lecoq; Hassan Shafiei; Charlotte Michel; Julien Deloffre; Arnaud Héquette; Vincent Sipka; Robert Lafite
Understanding the response of the intertidal dunes to the varying hydrodynamic conditions in mixed wave-tide environments is of high complexity. Field measurement is one of the most useful approaches to investigate the dune dynamics at different time (semi-diurnal and lunar cycles) and spatial (dunes and associated superimposed bedforms) scales. High-resolution laser scanner data for five successive
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Shallow gas and gas hydrate occurrences on the Northwest Greenland shelf margin Mar. Geol. (IF 3.04) Pub Date : 2020-11-23 David R. Cox; Mads Huuse; Andrew M.W. Newton; Arka D. Sarkar; Paul C. Knutz
Industrial 3D seismic data are used to investigate the contemporary hydrocarbon distribution and historical fluid migration in Melville Bay offshore northwest Greenland. Gas-related amplitude anomalies and an extensive bottom simulating reflector (BSR) were mapped within the uppermost 1–2 km of stratigraphy to define the first inventory of shallow gas and gas hydrate along this part of the Greenland
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Sediment budget and morphological change in the Red River Delta under increasing human interferences Mar. Geol. (IF 3.04) Pub Date : 2020-11-06 Nguyen Dac Ve; Daidu Fan; Bui Van Vuong; Tran Dinh Lan
The Red River sediment dispersal system has been increasingly altered by human activities, but the resultant morphodynamic change and sediment budget in the Red River Delta (RRD) has been little studied in a holistic perspective. In this study, time-series analysis of river water and sediment discharges from 1960 to 2010 was carried out to trace human interferences on sediment routing processes, and
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Evidence of recent flood deposits within a distal shelf depocenter and implications for terrestrial carbon preservation in non-deltaic shelf settings Mar. Geol. (IF 3.04) Pub Date : 2020-11-02 Joseph A. Carlin; Kathryn M. Schreiner; Timothy M. Dellapenna; Andrew McGuffin; Richard W. Smith
Extreme episodic events have the capacity to transport large amounts of terrestrial material to the coastal ocean. While estuaries and deltas are typically thought to trap most of this material, some escapes these coastal features and is transported to distal depocenters along the continental shelf. Distal shelf depocenters can act as the ultimate sink for event deposits, yet event sedimentation and
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Late Quaternary tectono-sedimentary processes on an isolated offshore high marginal platform (NW Iberian Continental Margin) Mar. Geol. (IF 3.04) Pub Date : 2020-10-28 A.E. López-Pérez; B. Rubio; D. Rey; M. Plaza-Morlote; L.M. Pinheiro
Studies of the most surficial sedimentary record from passive continental margins provide crucial knowledge about sedimentary dynamics and its changes through recent geological times. These studies allow understanding in detail the influence of both tectonic activity and long-term bottom-current circulation over the Late Quaternary sedimentary dynamics. Using a large dataset of multibeam bathymetry
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Sedimentary records of mid-Holocene coastal flooding at a Neolithic site on the southeast plain of Hangzhou Bay, east China Mar. Geol. (IF 3.04) Pub Date : 2020-11-09 Jing Huang; Yongning Li; Fengya Ding; Tongtong Zheng; Michael E. Meadows; Zhanghua Wang
The history and underlying mechanisms of extreme typhoon events during the Holocene on the east China coast are poorly resolved. This study presents an analysis of the chronology, sedimentology, and organic and alkaline-earth metal geochemistry of a profile (T0103W) collected from the Neolithic Xiawangdu site on the Ningbo Plain, east China coast. Through comparison with the chronology and palaeontology
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Syn-eruptive soft-sediment deformation structures in a deep submarine caldera: Havre, 2012 Mar. Geol. (IF 3.04) Pub Date : 2020-10-21 Jocelyn McPhie; Martin Jutzeler; Fumihiko Ikegami; Rebecca Carey
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Winding down the Chicxulub impact: The transition between impact and normal marine sedimentation near ground zero Mar. Geol. (IF 3.04) Pub Date : 2020-10-17 Michael T. Whalen; Sean P.S. Gulick; Christopher M. Lowery; Timothy J. Bralower; Joanna V. Morgan; Kliti Grice; Bettina Schaefer; Jan Smit; Jens Ormö; Axel Wittmann; David A. Kring; Shelby Lyons; Steven Goderis
The Chicxulub impact led to the formation of a ~ 200-km wide by ~1-km deep crater on México's Yucatán Peninsula. Over a period of hours after the impact the ocean re-entered and covered the impact basin beneath several hundred meters of water. A suite of impactites were deposited across the crater during crater formation, and by the resurge, tsunami and seiche events that followed. International Ocean
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Relative Sea-level stability and the radiocarbon marine reservoir correction at Natuna Island, Indonesia, since 6400 yr BP Mar. Geol. (IF 3.04) Pub Date : 2020-09-22 Jeannette Xiu Wen Wan; Aron J. Meltzner; Adam D. Switzer; Ke Lin; Xianfeng Wang; Sarah L. Bradley; Danny H. Natawidjaja; Bambang W. Suwargadi; Benjamin P. Horton
A high-precision relative sea level (RSL) record over the past 6400 years, reconstructed from fossil coral microatoll colonies, is reported for Natuna Island, Indonesia. The timing of 11 fossil microatolls from four sites on Natuna Island is constrained by replicate 14C and 230Th dates. We investigate the local marine reservoir correction (∆R) using the replicate dates. The two sets of dates become
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Origin of the rhythmic reddish-brown and greenish-gray sediments in the abyssal South China Sea: Implications for oceanic circulation in the late Miocene Mar. Geol. (IF 3.04) Pub Date : 2020-11-02 Xiaobo Jin; Juan Xu; Hui Li; Yanli Li; Peijun Qiao; Li Wu; Chen Ling; Baohua Li; Chuanlian Liu
During International Ocean Discovery Program (IODP) Expedition 368, a series of drillings were conducted in the northern South China Sea (SCS). At the abyssal drilling Site 1502 Hole A (3764 m below sea level), successive core sections were recovered from 442 to 497 m below sea floor. These cores were placed into the late Miocene period, and the most remarkable feature of these ~50-m-long cores were
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Mid-to-late Holocene upper slope contourite deposits off Capo Vaticano (Mediterranean Sea): High-resolution record of contourite cyclicity, bottom current variability and sandy facies Mar. Geol. (IF 3.04) Pub Date : 2020-11-06 Eleonora Martorelli; Alessandro Bosman; Daniele Casalbore; Francesco Chiocci; Aida Maria Conte; Letizia Di Bella; Gemma Ercilla; Federico Falcini; Pierpaolo Falco; Virgilio Frezza; Giovanni Gaglianone; Biagio Giaccio; Marco Mancini
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Depositional and erosional signatures in sedimentary successions on the continental slope and rise off Prydz Bay, East Antarctica– implications for Pliocene paleoclimate Mar. Geol. (IF 3.04) Pub Date : 2020-10-01 Xiaoxia Huang; Anne Bernhardt; Laura De Santis; Shiguo Wu; German Leitchenkov; Peter Harris; Philip O'Brien
The Prydz Bay region of Antarctica is the immediate recipient of ice and sediments transported by the Lambert Glacier, the single largest outflow from the East Antarctic Ice Sheet. The continental slope and rise provide records covering multiple glacial cycles and containing paleoclimatic information. Marine geological and geophysical data collected from the continental shelf and adjacent slope of
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The sines contourite depositional system along the SW Portuguese margin: Onset, evolution and conceptual implications Mar. Geol. (IF 3.04) Pub Date : 2020-11-02 S. Rodrigues; C. Roque; F.J. Hernández-Molina; E. Llave; P. Terrinha
The Sines Contourite Depositional System, located in the Southwest Portuguese Margin, is a central segment of the Iberian Contourite Depositional Complex, built under the influence of the Mediterranean Outflow Water (MOW). This work presents the onset and evolution of this system using multibeam bathymetry, multichannel seismic reflection lines, sediment cores and well data. Six seismic units of Late
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Pollen records of orbitally modulated variation in East Asian winter monsoon intensity and freshwater inflow to the Ulleung Basin of East Sea, South Korea, during the last glacial period Mar. Geol. (IF 3.04) Pub Date : 2020-10-15 Chang-Pyo Jun; Sangheon Yi; Chang-Hwan Kim; Chan Hong Park; Seong-Joo Lee
Most pollen analysis in Korea has focused on the Holocene Epoch, because pre-last glacial maximum terrestrial archives suitable for palynological study in the Korean Peninsula are limited. Thus, to verify the responses of vegetation to climate changes over the orbital timescales, analysis of pollen in marine sediments is needed. Here, we present the pollen record of hemipelagic sediments of core DD09-ST21
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Holocene evolution of the Ninety Mile Beach sand barrier, Victoria, Australia: The role of sea level, sediment supply and climate. Mar. Geol. (IF 3.04) Pub Date : 2020-10-13 David M. Kennedy; Thomas S.N. Oliver; Toru Tamura; Colin V. Murray-Wallace; Bruce G. Thom; Neville J. Rosengren; Daniel Ierodiaconou; Paul Augustinus; Chloe Leach; Jinjuan Gao; Sarah L. McSweeney; Teresa Konlechner; Colin D. Woodroffe
The Ninety-Mile Beach (NMB) barrier system in southeastern Australia is the largest active barrier island system in Australia. The response of a sandy barrier system to a warming climate is dependent on the boundary conditions of sediment supply and sea level. Deposition during the Holocene can therefore provide an indication of how these barriers may change in the future. In this study airborne LiDAR
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Morphodynamic evolution of the macrotidal Sittaung River estuary, Myanmar: Tidal versus seasonal controls Mar. Geol. (IF 3.04) Pub Date : 2020-10-16 Kyungsik Choi; Dohyeong Kim; Joohee Jo
The inner part of a tide-dominated estuary is often typified by a tight meander bend, where bedload transport from both upstream by river flows and downstream by flood tidal currents merges to establish a bedload convergence (BLC) with the weakest energy condition in the estuary. Despite the potential significance in evaluating relative importance between tidal and river processes, the morphodynamics
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Sediment budget of the Yellow River delta during 1959–2012, estimated from morphological changes and accumulation rates Mar. Geol. (IF 3.04) Pub Date : 2020-10-03 Liangyong Zhou; Jian Liu; Yoshiki Saito; Shaobo Diao; Maosheng Gao; Jiandong Qiu; Congliang Xu; Lelong He; Siyuan Ye
The Yellow River (Huanghe) is a major sediment source of sediment to the Bohai Sea and Yellow Sea, resulting in the formation of a large and dynamic delta complex. However, the river sediment discharge reaching the delta has decreased dramatically since the middle 1960s. This study examines the sediment accumulation and morphological changes of the delta complex during 1959–2012 using a repeated bathymetry
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Environmental controls on particle fluxes in the Gulf of Valencia, NW Mediterranean. Mar. Geol. (IF 3.04) Pub Date : 2020-10-28 E. Isla; M. Ribó; P. Puig
Three instrumented lines were installed on the continental slope and the basin of the Gulf of Valencia for thirteen months (May 2010 to June 2011) aiming to study particle fluxes and their relationship with environmental parameters. Total mass flux varied between 52 mg m−2 d−1 in the central part of the basin and 7199 mg m−2 d−1 in the northern slope sector. The main biogenic constituent was calcium
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Internal tides as a major process in Amazon continental shelf fine sediment transport Mar. Geol. (IF 3.04) Pub Date : 2020-10-04 Ernesto Molinas; Juliane Castro Carneiro; Susana Vinzon
The description of hydrodynamics associated with the extensive reef system on the shelf break adjacent to the Amazon River is still a challenge for ocean sciences. Despite the discharge of more than one billion tons of cohesive sediment per year, the outer continental shelf of the world's largest river presents very low concentrations of suspended sediment near the bottom and an absence of modern fine
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The magma-poor Somalian continental margin: Lower crustal boudinage and mantle exhumation Mar. Geol. (IF 3.04) Pub Date : 2020-09-30 Mohamed A. Haji Hassan; Peter Klitzke; Dieter Franke
Combined interpretation of 2D reflection seismic data and 2D gravity modelling reveals an Iberian-type magma-poor margin across the Obbia Basin in offshore central Somalia. The configuration of the syn-rift and post-rift sediments as well as the upper crust, the lower crust and the Moho delineates four distinct marginal domains. The proximal domain is characterized by thickest crust and narrow underfilled
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Sediment transport mechanisms in altered depositional environments of the Anthropocene Nakdong Estuary: A numerical modeling study Mar. Geol. (IF 3.04) Pub Date : 2020-10-07 Jongwi Chang; Guan-hong Lee; Courtney K. Harris; Yongsik Song; Steven M. Figueroa; Nathalie W. Schieder; Kenneth D. Lagamayo
The Nakdong Estuary, Korea, is a dramatic example of an Anthropocene estuary. Over the last century, the construction of two dams has divided the estuary into two discharge energy regimes with the East Nakdong Estuary receiving discharge and the West Nakdong Estuary receiving no discharge. The mean-flow sediment flux gradient during high discharge was the main mechanism for deposition in the East Nakdong
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Modelling flocculation: Towards an integration in large-scale sediment transport models Mar. Geol. (IF 3.04) Pub Date : 2020-10-01 C. Chassagne; Z. Safar
Despite recent advancement in the field of sediment transport, the integration of cohesive sediment properties in large-scale transport models remain a challenging task. In order to model adequately the change in particle size that occurs in different environmental conditions, flocculation models based on the so-called Population Balance Equations (PBE) are often used. These models have to be efficient
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Intermediate and deep ocean current circulation in the Mozambique Channel: New insights from ferromanganese crust Nd isotopes Mar. Geol. (IF 3.04) Pub Date : 2020-09-28 Claire Charles; Ewan Pelleter; Sidonie Révillon; Philippe Nonnotte; Stephan J. Jorry; Jean-Michel Kluska
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Holocene sedimentary evolution and hypoxia development in the subaqueous Yangtze (Changjiang) Delta, China Mar. Geol. (IF 3.04) Pub Date : 2020-10-02 Taoyu Xu; Xuefa Shi; Guoqing Wang; Yanguang Liu; Shengfa Liu; Shuqing Qiao; Zhengquan Yao; Xin Wang; Xisheng Fang; Xiaoyan Li; Peng Cao; Jianxing Liu
This study investigates Holocene sedimentary evolution and hypoxia development using borehole cores CJK06 and CJK09, in combination with other published core data. Based on lithology and microfossil (benthic foraminifera) characteristics, seven types of sedimentary facies were identified from the base upward: river, tidal flat, tide-influenced river, transgressive lag, estuary, inner-shelf, and prodelta
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Magnetic fabric of Bengal fan sediments: Holocene record of sedimentary processes and turbidite activity from the Ganges-Brahmaputra river system Mar. Geol. (IF 3.04) Pub Date : 2020-09-22 Eva Moreno; Fabien Caroir; Lea Fournier; Kelly Fauquembergue; Sébastien Zaragosi; Ronan Joussain; Christophe Colin; Marie-Madeleine Blanc-Valleron; François Baudin; Thibault de Garidel-Thoron; Jean Pierre Valet; Franck Bassinot
We present here a study based on the Anisotropy of Magnetic Susceptibility (AMS) and magnetic mineralogy carried out on the composite core MD17&18taken from the eastern levee of the active channel of the middle Bengal Fan in the Indian Ocean. Based on C-14 dating, the sedimentary sequence covers 9.8 ka in 39 m of sediment. It therefore records at very high resolution the variations in continental material
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Geomorphic and temporal evolution of a Mississippi delta flanking barrier island: Grand Isle, LA Mar. Geol. (IF 3.04) Pub Date : 2020-09-22 Julie Torres; Mark Kulp; Duncan FitzGerald; Ioannis Georgiou; Kenneth Lepper
Barrier islands throughout the world are increasingly stressed due to accelerating sea-level rise (SLR), increasing storminess, and diminishing sediment supplies. This condition is particularly evident along the Louisiana coast because it has one of the highest rates of relative SLR in the world and very limited sand sources. One of the keys in predicting how barrier islands will change in the future
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Tectonic, volcanic and hydrothermal features of a nascent rift graben in the southern Okinawa Trough Mar. Geol. (IF 3.04) Pub Date : 2020-09-19 Hiroki Minami; Yasuhiko Ohara
High-resolution geophysical mapping using an autonomous underwater vehicle (AUV) and surface vessel revealed tectonic, volcanic and hydrothermal features of a nascent rift graben in the southern Okinawa Trough. Ship-based bathymetry identified ENE–WSW trending lineaments at a water depth of 1900–2000 m that form a rift graben, the Ishigaki Rift, which is ~50 km long, ~7 km wide and has relief of ~100 m
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Post-rift submarine volcanic complexes and fault activities in the Baiyun Sag, Pearl River Mouth Basin: New insights into the breakup sequence of the northern South China Sea Mar. Geol. (IF 3.04) Pub Date : 2020-09-08 Wei Zhou; Haiteng Zhuo; Yingmin Wang; Qiang Xu; Dong Li
Post-rift volcanisms and fault activities are significant for understanding the tectonic-sedimentary evolution of rifted continental margins and associated hydrocarbon entrapments. In this study, a series of post-rift fault-associated volcanic activities have been found in the northern continental margin of the South China Sea (SCS). However, their episodes and relationships with the progressive continental
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Volcanic ash inputs enhance the deep-sea seabed metal-biogeochemical cycle: A case study in the Yap Trench, western Pacific Ocean Mar. Geol. (IF 3.04) Pub Date : 2020-09-17 Ling Li; Shijie Bai; Jiwei Li; Shiming Wang; Limei Tang; Shamik Dasgupta; Yongjie Tang; Xiaotong Peng
Although volcanic ash deposition into oceans has been a frequent phenomenon for much of geologic history, the potential effects on deep-sea seabed metal-biogeochemical cycles remain enigmatic. In this study, we analyzed mineral compositions, microbial communities, and metal-related functional genes in a sediment core with volcanic ash layers from the Yap Trench in the western Pacific Ocean. The mineralogical
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Detecting shifts of submarine sediment boundaries using side-scan mosaics and GIS analyses Mar. Geol. (IF 3.04) Pub Date : 2020-09-19 Daphnie S. Galvez; Svenja Papenmeier; H. Christian Hass; Alexander Bartholomae; Vera Fofonova; Karen Helen Wiltshire
Detecting changes of sediment boundaries on the seafloor is important for a better understanding of sediment dynamics and related impacts to benthic habitats. Side-scan sonars (SSS) perform more cost-effectively in shallow waters than other acoustic systems because of their larger swath widths, and the resolution of its images does not change with varying water depth. However, as they are generally
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Quantitative reconstruction of Holocene sediment source variations in the Yellow and northern East China Seas and their forcings Mar. Geol. (IF 3.04) Pub Date : 2020-09-19 Dhongil Lim; Jihun Kim; Zhaokai Xu; Hoisoo Jung; Dong-Geun Yoo; Mansik Choi; So-Young Kim
Sediment provenance in the Yellow Sea and northern East China Seas (YECSs) has long been a subject of interest, but its quantification is still inconclusive. Here, we present an improved AlMg regression analysis by refining its methodological approach to strengthen quantification of sediment source-to-sink transports in the YECSs, with focus on its forcing mechanisms during the Holocene. Our quantitative
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Transport mechanism and fate of terrestrial materials delivered by a small tropical mountainous river: A case study of the Kelantan River, Malaysia Mar. Geol. (IF 3.04) Pub Date : 2020-09-18 Wang Ai-jun; Bong Chui Wei; Ye Xiang; Li Yun-hai; Meor Hakif Amir Hassan; Loh Kar Hoe; Xu Yong-hang; Wang Liang; Xu Xiao-hui; Wang Feng; Li Dong-yi; Lai Zhi-kun
Tropical mountain river systems that drain rainforests and experience tropical monsoons typically demonstrate high runoff and discharge a disproportionate amount of particulate load to the world’'s oceans compared with other more temperate river systems. As a typical tropical small mountainous river with an broad continental shelf system and wave dominated environment, the Kelantan River is one of
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Sediment export and impacts associated with river delta channelization compound estuary vulnerability to sea-level rise, Skagit River Delta, Washington, USA Mar. Geol. (IF 3.04) Pub Date : 2020-09-06 E.E. Grossman; A.W. Stevens; P. Dartnell; D. George; D. Finlayson
Improved understanding of the budget and retention of sediment in river deltas is becoming increasingly important to mitigate and plan for impacts expected with sea level rise. In this study, analyses of historical bathymetric change, sediment core stratigraphy, and modeling are used to evaluate the sediment budget and environmental response of the largest river delta in the U.S. Pacific Northwest
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Aleutian island arc magma production rates and primary controlling factors Mar. Geol. (IF 3.04) Pub Date : 2020-09-20 Yongliang Bai; Diya Zhang; Dongdong Dong; Shiguo Wu; Zhenjie Wang
Island arc magmatism is considered a major mechanism of continental crustal growth; hence, the variation in island arc magma production rates and its influencing factors are of great importance. The along-arc strike variation in the island arc magma production rate is important for elucidating whether the subduction zone temperature is a controlling factor on arc magmatism. No back-arc spreading or
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A single-stage megaflood at the termination of the Messinian salinity crisis: Geophysical and modelling evidence from the eastern Mediterranean Basin Mar. Geol. (IF 3.04) Pub Date : 2020-09-06 Daniele Spatola, José David del Moral-Erencia, Aaron Micallef, Angelo Camerlenghi, Daniel Garcia-Castellanos, Sanjeev Gupta, Patricio Bohorquez, Marc-André Gutscher, Claudia Bertoni
The Messinian salinity crisis was an extraordinary event that resulted in the deposition of kilometre-thick evaporite sequences in the Mediterranean Sea after the latter became disconnected from the world's oceans. The return to fully and stable marine conditions at the end of the crisis is still subject to debate. Three main hypotheses, based on geophysical and borehole data, onshore outcrops and
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Response of trophic structure and isotopic niches of the food web to flow regime in the Yellow River estuary Mar. Geol. (IF 3.04) Pub Date : 2020-09-02 Qi Liu, Yujun Yi, Chuanying Hou, Xuefei Wu, Jie Song
Variations in the flow regime lead to changes in the spatial and temporal distributions of nutrients entering the estuary area from the river, which causes corresponding changes in the trophic structure of the estuarine food web and ultimately affects the entire ecosystem. Therefore, studying the responses of estuarine food webs to changes in upstream water and sediment conditions is of great significance
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Enhanced hydrothermal activity on an ultraslow-spreading supersegment with a seismically detected melting anomaly Mar. Geol. (IF 3.04) Pub Date : 2020-09-01 Huaiming Li, Chunhui Tao, Xihe Yue, Edward T. Baker, Xianming Deng, Jianping Zhou, Yuan Wang, Guoyin Zhang, Jie Chen, Shihui Lü, Xin Su
Seafloor hydrothermal venting fields occur on all ocean spreading ridges (OSRs) regardless of spreading rates. However, the distribution of seafloor hydrothermal activity such as frequency and spacing on ultraslow-spreading OSRs are poorly known. Chinese Dayang cruises from 2015 to 2016 conducted detailed water column surveys for seafloor hydrothermal activity using a towed system, with an array of
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4D forward stratigraphic modelling of the Late Quaternary Congo deep-sea fan: Role of climate/vegetation coupling in architectural evolution Mar. Geol. (IF 3.04) Pub Date : 2020-08-31 Dimitri Laurent, Tania Marsset, Laurence Droz, Didier Granjeon, Stéphane Molliex, Marie Picot, Marina Rabineau
The relative impacts of autogenic and allogenic controls on the architectural evolution of deep-sea fans are not well constrained, mainly because of the difficulty in evaluating the role of each control on any specific stratigraphic pattern. This study presents four-dimensional (4D) forward stratigraphic modelling of the Late Quaternary Congo Axial Fan, which provides new insights on forcing factors
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