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A 500 kyr record of global sea-level oscillations in the Gulf of Lion, Mediterranean Sea: new insights into MIS 3 sea-level variability ArchiMer
Frigola, J.; Canals, M.; Cacho, I.; Moreno, A.; Sierro, F. J.; Flores, J. A.; Berne, Serge; Jouet, Gwenael; Dennielou, Bernard; Herrera, G.; Pasqual, C.; Grimalt, J. O.; Galavazi, M.; Schneider, R..
Borehole PRGL1-4 drilled in the upper slope of the Gulf of Lion provides an exceptional record to investigate the impact of late Pleistocene orbitally-driven glacio-eustatic sea-level oscillations on the sedimentary outbuilding of a river fed continental margin. High-resolution grain-size and geochemical records supported by oxygen isotope chronostratigraphy allow reinterpreting the last 500 ka upper slope seismostratigraphy of the Gulf of Lion. Five main sequences, stacked during the sea-level lowering phases of the last five glacial-interglacial 100-kyr cycles, form the upper stratigraphic outbuilding of the continental margin. The high sensitivity of the grain-size record down the borehole to sea-level oscillations can be explained by the great width of...
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Ano: 2012 URL: http://archimer.ifremer.fr/doc/00088/19944/17599.pdf
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A geomechanical approach for the genesis of sediment undulations on the Adriatic shelf - art. no. Q04R03 ArchiMer
Sultan, Nabil; Cattaneo, Antonio; Urgeles, R; Lee, H; Locat, J; Trincardi, F; Berne, Serge; Canals, M; Lafuerza, S.
This study is among the first to examine the genesis of the seafloor and subsurface undulations on the Adriatic continental shelf by integrating stratigraphic information and in situ and laboratory geotechnical measurements. Interpretation of sediment behavior is based on a 32-m-long borehole crossing ( 1) a possible shear plane and ( 2) a silty clay layer at about 20 m below seafloor (mbsf) on which sediment undulations are rooted and could be interpreted as a potential weak layer succession. Our main results in terms of triggering mechanism for the observed undulations show that under an earthquake, liquefaction and/or failure of the silty-clay sediments ( weak layer) leading to deformation of the upper more cohesive sediments is possible only when such...
Tipo: Text Palavras-chave: Sediment deformation; Shear strength; Earthquake; Adriatic shelf.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4105.pdf
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Analysis of slope failures in submarine canyon heads: An example from the Gulf of Lions ArchiMer
Sultan, Nabil; Gaudin, Mathieu; Berne, Serge; Canals, Miquel; Urgeles, Roger; Lafuerza, Sara.
To improve understanding of evolution of submarine canyons, a three-dimensional slope-stability model is applied to Bourcart Canyon in the western Gulf of Lions in the Mediterranean Sea. The model builds on previous work by Chen and others, and it uses the upper bound theorem of plasticity to calculate the factor of safety of a kinematically admissible failing mass. Examples of three-dimensional failure surfaces documented in the literature were used to test the model formulation. Model application to Bourcart Canyon employed the results of a detailed stratigraphic analyses based on data acquired by swath bathymetry, sub-bottom profiling, high-resolution seismic reflection surveys, and piston coring. The sediment layers were also characterized using...
Tipo: Text Palavras-chave: Cascadia accretionary complex; Upper bound theorem; Stability analysis; Continental slope; Limit equilibrium; Western gulf; Offshore; Margin; Initiation; Sediment.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2410.pdf
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Architecture et dynamique des dunes tidales. Exemples de la marge atlantique française ArchiMer
Berne, Serge.
Ce travail propose une confrontation entre l'analyse des enregistrements contenus dans la structure interne des dunes sous-aquatiques et les facteurs hydrodynamiques contrôlant leur mise en place et leur évolution. Trois secteurs de la marge atlantique française, caractérisés par des conditions hydro-sédimentaires contrastées, sont étudiés en détail. Les techniques mises en œuvre comprennent des reconnaissances de bathymétrie, imagerie acoustique, sismique haute résolution, prises de vue et observations en plongée, ainsi qu'une instrumentation de certains sites pour mesurer l'effet du courant de marée et de la houle sur le transport sédimentaire. Des prélèvements superficiels à la benne et des carottages à l'aide de vibro-carottiers permettent de calibrer...
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Ano: 1991 URL: http://archimer.ifremer.fr/doc/00034/14538/11817.pdf
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Axial incision: The key to understand submarine canyon evolution (in the western Gulf of Lion) ArchiMer
Baztan, Juan; Berne, Serge; Olivet, Jean-louis; Rabineau, Marina; Aslanian, Daniel; Gaudin, Mathieu; Rehault, Jean Pierre; Canals, M.
A detailed morphological analysis of the outer shelf and continental slope of the Western Gulf of Lion is presented, based on swath bathymetry data together with sub-bottom profiles and high resolution seismic reflection profiles. These data reveal two main erosive features, of very different dimensions: the axial incision and the canyon's major valley. The height of axial incisions' flanks with respect to the canyon deepest point (the thalweg) ranges from 40 to 150 m. It creates a small axial erosive path within the canyon's major valley, which is typically bounded by flanks of more than 700 m in height. We interpret the axial incision observed in the sea floor as the imprint of turbidity currents that eroded the floor of canyons during phases of...
Tipo: Text Palavras-chave: Submarine canyon; Axial incision; Gulf of Lion.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-353.pdf
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Chronology and sources of trace elements accumulation in the Rhône pro-delta sediments (Northwestern Mediterranean) during the last 400years ArchiMer
Cossa, Daniel; Fanget, Anne-sophie; Chiffoleau, Jean-francois; Bassetti, M-a; Buscail, R.; Dennielou, Bernard; Briggs, K.; Arnaud, M; Guedron, S.; Berne, Serge.
The Rhône pro-delta sediments receive the particulate inputs from the Rhône River, the largest freshwater discharge of the Western Mediterranean Sea. Trace element (TEs: Ag, Cd, Co, Cr, Cu, Ni, Pb, and Zn) concentrations and stable Pb isotope ratios were determined along a 7.7-meter-long sediment core collected from the Rhône prodeltaic lobe, archiving the deposits of the last 400 years. Trace element mean concentrations during the pre-industrialized era (before 1850 AD) were no different from the average composition of Earth’s upper crust, except for Cr. Principal component analysis, performed on TEs and tracers, suggests three origins for TEs that we identified as (i) marine biogenic material (Ag, Cd), (ii) ultramafic rocks (Li, Cr, Ni), and (iii) other...
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Ano: 2018 URL: http://archimer.ifremer.fr/doc/00371/48209/48323.pdf
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Clay mineral evolution in the central Okinawa Trough since 28 ka: Implications for sediment provenance and paleoenvironmental change ArchiMer
Dou, Yanguang; Yang, Shouye; Liu, Zhenxia; Clift, Peter D.; Yu, Hua; Berne, Serge; Shi, Xuefa.
The Okinawa Trough is a natural laboratory for the study of later Quaternary land-ocean interaction and paleoenvironmental changes. In this study we reconstruct the evolution of clay mineral assemblages in Core DGKS9604 retrieved from the central Okinawa Trough. Illite dominates the clay mineral compositions, with average contents above 60%. Clay mineral evolution since 28 ka is closely related to changes in sediment provenance and paleoenvironment. Sea level rise and the strength of the Kuroshio Current control the dispersal and deposition of clays on the East China Sea shelf and in the Okinawa Trough, and thus, determine the clay mineral compositions in the core sediments. During the late last glacial period (28.0-14.0 ka), the paleo-Changjiang River...
Tipo: Text Palavras-chave: Clay mineral; Sediment; Provenance; East China Sea; Okinawa Trough.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00002/11367/7977.pdf
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Climatic and environmental variations during 130 ka : investigations from sedimentary record on the Rhône deltaic margin (Gulf of Lions, NW Mediterranean) ArchiMer
Jouet, Gwenael; Gaudin, Mathieu; Bassetti, Maria-angela; Berne, Serge; Rabineau, Marina; Dennielou, Bernard; Sierro, F; Flores, J; Taviani, M.
The Rhône deltaic margin (NW Mediterranean) was under the influence of a very high sedimentation flux during the last climatic cycle, because of the vicinity of major fluvial systems that fed the outer shelf during the glacial period and the inner shelf during the deglacial period. The two areas provide a complete sedimentary record of depositional events from 130 cal. kyr BP to present. This sequence represents the sedimentary expression of the glacial/interglacial cycle (100 kyr cyclicity) within the Late Quaternary succession [1]. [Extract]
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Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-6152.pdf
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Comments on "Shallow gas off the Rhone prodelta, Gulf of Lions" by Garcia-Garcia et al. (2006) Marine Geology 234 (215-231) - Reply ArchiMer
Garcia Garcia, A; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T; Miserocchi, S; Berne, Serge; Friend, P; Nittrouer, C; Normand, Alain.
We really appreciate the interest and comments regarding our manuscript. We hope we address all the lingering issues in this reply. This also gives us the opportunity of publishing an update on our dataset that will complete the original manuscript (see Table 1). We have followed the author pattern in our answers: I-Gas sampling procedure, 2-Reported gas concentrations results, 3-General remarks, 4-Conclusions. (c) 2007 Elsevier B.V. All rights reserved.
Tipo: Text Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3846.pdf
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Compte-rendu et premiers dépouillements de la mission ECOSIG ArchiMer
Berne, Serge; Boelle, Jl; Lericolais, Gilles; Guillemot, P; Herveou, J.
Les objectifs affichés de cette mission qui s'est déroulée les 25 et 26 août 1985 à bord du CYROS étaient les suivants : - effectuer la recette d'une source sismique de type sparker (SIG 1580) - réaliser des enregistrements sismiques analogiques en vue d'une numérisation à terre pour effectuer des traitements - entreprendre une reconnaissance sismique préliminaire sur le site retenu pour l'implantation du phare d'Ouessant (Aide Majeure à la Navigation), ceci pour préparer la mission DERO-GM de 1986. Ce dernier objectif qui était lié aux conditions météorologiques n'a pu être réalisé, compte-tenu du peu de temps imparti pour cette mission
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Ano: 1986 URL: https://archimer.ifremer.fr/doc/00419/53062/54006.pdf
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Control of Quaternary sea-level changes on gas seeps ArchiMer
Riboulot, Vincent; Thomas, Yannick; Berne, Serge; Jouet, Gwenael; Cattaneo, Antonio.
Gas seeping to the seafloor through structures such as pockmarks may contribute significantly to the enrichment of atmospheric greenhouse gases and global warming. Gas seeps in the Gulf of Lions, Western Mediterranean, are cyclical and pockmark “life” is governed both by sediment accumulation on the continental margin and Quaternary climate changes. 3D seismic data, correlated to multi-proxy analysis of a deep borehole, have shown that these pockmarks are associated with oblique chimneys. The prograding chimney geometry demonstrates the syn-sedimentary and long-lasting functioning of the gas seeps. Gas chimneys have reworked chronologically constrained stratigraphic units and have functioned episodically, with maximum activity around sea-level lowstands....
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00199/31063/29476.pdf
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Dynamique, architecture et préservation des corps sableux de plate-forme ArchiMer
Berne, Serge.
Ce mémoire synthétise les travaux récents sur différents corps sableux de plate-forme. Il est basé sur l'analyse de données géophysiques et sédimentologiques provenant essentiellement des marges françaises (Manche, Atlantique, Méditerranée) et de la Mer de Chine de l'Est.
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Ano: 1999 URL: http://archimer.ifremer.fr/doc/00034/14552/11801.pdf
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Epi-bathyal ostracod assemblage in Holocene Rhone deltaic sediments (Gulf of Lions, NW Mediterranean) and their palaeoecological implications ArchiMer
Fanget, Anne-sophie; Bassetti, Maria Angela; Berne, Serge; Arnaud, Mireille.
Since the Last Glacial Maximum, the Rhone River, which is the most important source of freshwater and sediment to the western Mediterranean Sea, migrated in a north-westward direction during the rapid Deglacial and Early Holocene sea-level rise. During the phase of global high sea-level (Middle and Late Holocene), an overall eastward migration of the Rhone outlet, under natural and/or human influence, is recorded through several sediment accumulations confined along the inner shelf in the form of deltaic lobes. These lobes that make up the whole Rhone subaqueous delta represent very expanded sedimentary archives of the Rhone Holocene history. In this paper, using three long piston cores retrieved from the most recent Bras de Fer (RHS-KS55) and Roustan...
Tipo: Text Palavras-chave: Ostracodes; Delta sous-marin; Paléoécologie; Holocène; Méditerranée occidentale; Ostracoda; Subaqueous delta; Palaeoecology; Holocene; Western Mediterranean..
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00217/32810/31253.pdf
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Erosional processes and paleo-environmental changes in the Western Gulf of Lions (SW France) during the Messinian Salinity Crisis ArchiMer
Lofi, Johanna; Gorini, Christian; Berne, Serge; Clauzon, Georges; Dos Reis, A.tadeu; Ryan, William; Steckler, Michael.
Current interpretation of the Messinian Salinity Crisis (MSC) involves partial "clesiccation" of the Mediterranean Sea coupled with the deposition of thick evaporites in the deep basins. New sets of seismic reflection profiles in the western part of the Gulf of Lions confirm the basinward extension of the Messinian erosion and enable the mapping of distinctive seismic markers indicating the Messinian Erosional Surface (or Messinian unconformity), the basin-margin detrital deposits, and the deep evaporite sequence. The geometrical relationship between these three elements and their relationship to the paleogeography of the margin during the MSC provide new information about the evolution of the study area during the Messinian. The Messinian Erosional...
Tipo: Text Palavras-chave: Fluvial erosion; Eustasy; Tectonism; Detrital deposits; Erosional surface; Messinian Salinity Crisis; Gulf of Lions.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-782.pdf
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Evidence for pre-Messinian submarine canyons on the Gulf of Lions slope (Western Mediterranean) ArchiMer
Lofi, J; Berne, Serge.
On the Gulf of Lions margin, the Messinian Salinity Crisis (MSC) event led to a significant and widespread erosion of the Miocene shelf and slope. It is thus difficult nowadays to restore the morphology of the margin at the beginning of the crisis, and to study the Middle-Upper Miocene series rarely preserved from erosion. In this study, thanks to the use of multichannel seismic reflection data from the Gulf of Lions western slope, it has been possible to image the Miocene slope deposits. Interpretation of the data reveals several diachronic sediment bodies just beneath the Miocene/Pliocene boundary. These bodies are related to slope erosional-depositional complexes, underlain by erosional unconformities outlined by seismic reflector truncations. They are...
Tipo: Text Palavras-chave: Messinian salinity crisis; Passive margin; Miocene/Pliocene; Submarine canyon.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4779.pdf
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Evidence for the 8,200 a BP cooling event in the middle Okinawa Trough ArchiMer
Yu, H; Xiong, Y; Liu, Z; Berne, Serge; Huang, C; Jia, G.
Based on new and existing data on oxygen isotopes, alkenone-surface seawater temperature trends, planktonic foraminifers, lithology, and clay mineral composition of piston cores, a distinct cooling event has been identified around 8,200 cal a B.P. in the middle Okinawa Trough, northwest Pacific. This corresponds to the 8,200 a B.P. cooling event recorded in many places of the Northern Hemisphere. During this event, the local temperature decreased by 1 degrees C, and the delta O-18 value increased by 0.6%omicron. A strengthened Asian winter monsoon is the most probable cause for this event, which thus adds further credibility to the contention that we are dealing here with a global phenomenon.
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Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4207.pdf
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Impact of relative sea level and rapid climate changes on the architecture and lithofacies of the Holocene Rhone subaqueous delta (Western Mediterranean Sea) ArchiMer
Fanget, Anne-sophie; Berne, Serge; Jouet, Gwenael; Bassetti, Maria-angela; Dennielou, Bernard; Maillet, Gregoire M.; Tondut, Mathieu.
The modern Rhone delta in the Gulf of Lions (NW Mediterranean) is a typical wave-dominated delta that developed after the stabilization of relative sea level following the last deglacial sea-level rise. Similar to most other deltas worldwide, it displays several stacked parasequences and lobes that reflect the complex interaction between accommodation, sediment supply and autogenic processes on the architecture of a wave-dominated delta. The interpretation of a large set of newly acquired very high-resolution seismic and sedimentological data, well constrained by 14C dates, provides a refined three-dimensional image of the detailed architecture (seismic bounding surfaces, sedimentary facies) of the Rhone subaqueous delta, and allows us to propose a...
Tipo: Text Palavras-chave: Delta; Holocene; Maximum Flooding Surface; Sea level; Tempestites; Western Mediterranean.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00179/29017/27445.pdf
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Impact of river channel shifts on tetraether lipids in the Rhône prodelta (NW Mediterranean): Implication for the BIT index as an indicator of palaeoflood events ArchiMer
Kim, Jung-hyun; Buscail, Roselyne; Fanget, Anne-sophie; Eyrolle-boyer, Frederique; Bassetti, Maria-angela; Dorhout, Denise; Baas, Marianne; Berne, Serge; Damste, Jaap S. Sinninghe.
We tested the applicability of the BIT (branched and isoprenoid tetraether) index as a proxy for palaeoflood events in the river-dominated continental margin of the Gulf of Lions (NW Mediterranean). We compared the concentrations of branched glycerol dialkyl glycerol tetraethers (br GDGTs) and crenarchaeol in suspended particulate matter (SPM) collected downstream in the Rhône River, as well as in surface sediments and a ca. 8m piston core from the Rhône prodelta. The core covered the last 400 yr, with four distinct intervals recording the river influence under natural and man-induced shifts in four main channels of the river mouth (Bras de Fer, Grand Rhône, Pégoulier,and Roustan). The results indicate that there are mixed sources of br GDGTs and...
Tipo: Text Palavras-chave: Palaeoflood; BIT index; GDGTs; Rhone prodelta.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00198/30969/29345.pdf
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Influence of storms on tidal dune mobility in the Strait of Dover ArchiMer
Le Bot, Sophie; Trentesaux, Alain; Garlan, Thierry; Berne, Serge; Chamley, Hervé.
The present paper deals with dune dynamics in a zone of the Strait of Dover located in the sea lane running into the North Sea. The dunes, widespread in this 35-m depth area, are mobile sedimentary structures (up to 40 m.yr(-1)) that culminate at a maximum of 22 m depth and endanger navigation as well as submarine man-made structures (cables, pipelines). Single- and multibeam bathymetric data, coupled with seismic data, allow us to follow dune displacements over different time scales. A net bedload parting zone has been displayed and divides the area into two parts, SE and NW. However, according to the considered time-scale, dune movements present Variations in intensity and direction. Over a long-term period (decades), sedimentary dynamics fit the...
Tipo: Text Palavras-chave: Tempêtes; Dunes tidales; Dynamique sédimentaire; Détroit du Pas de Calais; Storms; Tidal dunes; Sedimentary dynamics; Strait of Dover.
Ano: 2000 URL: https://archimer.ifremer.fr/doc/2000/publication-519.pdf
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Internal architecture and mobility of tidal sand ridges in the East China Sea ArchiMer
Liu, Zhenxia; Berne, Serge; Saito, Yoshiki; Yu, Hua; Trentesaux, Alain; Uehara, Katsuto; Yin, Ping; Liu, J. Paul; Li, Chaoxing; Hu, Guanghai; Wang, Xiangqin.
On the basis of bathymetric and seismic data and data from piston cores collected by the Chinese-French marine geology and geophysics investigation of 1996, we discuss the internal architecture and mobility of tidal sand ridges in the East China Sea (ECS). We characterized the sand ridges on the middle to outer shelf of the ECS as tide-dominated sand ridges with southwest dipping beds, indicating that the regional net sediment transport is toward the southwest. As the sand ridges gradually migrate toward the southwest, new sand ridges are continually replacing old ones, and several generations of sand ridges have developed in the study area. High-resolution seismic data, acoustic Doppler current profiler data, and two C-14-dated piston cores, DGKS9614...
Tipo: Text Palavras-chave: Transgression; Ridge evolution; East China Sea; Mobility; Internal architecture; Tidal sand ridge.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3309.pdf
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