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Registros recuperados: 44
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A 130,000-year record of Levantine Intermediate Water flow variability in the Corsica Trough, western Mediterranean Sea ArchiMer
Toucanne, Samuel; Jouet, Gwenael; Ducassou, Emmanuelle; Bassetti, Maria-angela; Dennielou, Bernard; Minto'O, Charlie Morelle Angue; Lahmi, Marjolaine; Touyet, Nicolas; Charlier, Karine; Lericolais, Gilles; Mulder, Thierry.
Sortable silt particle-size data and stable isotope analyses from the Corsica Trough, western Mediterranean Sea, provide a continuous palaeoceanographic record of the inflow, ventilation and vertical fluctuations of the Levantine Intermediate Water (LIW) in the northern Tyrrhenian Sea for the last 130,000 years. The results presented herein reveal that climate changes drive the Mediterranean intermediate circulation on Milankovitch to millennial time-scales. Intensified intermediate inflow and ventilation in the Corsica Trough occurred throughout the last glacial interval, with a cold / faster – warm / slower pattern existing between the Dansgaard-Oeschger climatic oscillations (including Heinrich events) and the LIW variability. By contrast, a weak...
Tipo: Text Palavras-chave: Levantine Intermediate Water; Mediterranean Sea; Thermohaline circulation; Palaeoceanography.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00054/16506/14023.pdf
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A post Younger Dryas Black Sea regression identified from sequence stratigraphy correlated to core analysis and dating ArchiMer
Lericolais, Gilles; Guichard, F.; Morigi, C.; Minereau, Amelie; Popescu, Irina; Radan, S..
The north-western Black Sea shelf is the widest continental shelf of the Black Sea, where the Danube delta/prodelta system includes important records on the Black Sea water level fluctuations. This study integrates newly acquired high-resolution single channel seismic reflection profiles and Calypso piston cores recovered along a transect extending from the Danube delta deep into its deep sea fan. The correlated results provide information on the Late Quaternary architecture of the Danube Black Sea shelf and on the role of global glacio-eustatic fluctuations on the building of the Danube delta/prodelta. The sedimentary sequences in the Black Sea are strongly affected by water level changes. For the whole duration of Late Glacial-Holocene period, the level...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00015/12637/9635.pdf
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A revised calendar age for the last reconnection of the Black Sea to the global ocean ArchiMer
Soulet, Guillaume; Menot, G.; Lericolais, Gilles; Bard, E..
During the last decade, a debate arose regarding the timing and pattern of the last reconnection of the Black Sea "Lake" with the global ocean. On a geochemical basis, the radiocarbon age of Black Sea "Lake" surface water, during the time of reconnection, was determined to be similar to 8400 C-14 a. BP. Despite the potential bias induced by the hard water effect in lakes, the reconnection age was calibrated without any reservoir age correction, which led to an estimate of similar to 9400 cal a. BR Since knowledge for the actual calendar age has important hydrologic implications that would provide new insights regarding the mechanism of reconnection, determining the actual calendar age for the last reconnection remains important. Based upon modeling...
Tipo: Text Palavras-chave: Black sea; Reconnection; Reservoir age; Bosphorus sill.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00038/14909/12351.pdf
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Abrupt drainage cycles of the Fennoscandian Ice Sheet ArchiMer
Soulet, Guillaume; Menot, Guillemette; Bayon, Germain; Rostek, Frauke; Ponzevera, Emmanuel; Toucanne, Samuel; Lericolais, Gilles; Bard, Edouard.
Continental ice sheets are a key component of the Earth’s climate system, but their internal dynamics need to be further studied. Since the last deglaciation, the northern Eurasian Fennoscandian Ice Sheet (FIS) has been connected to the Black Sea (BS) watershed, making this basin a suitable location to investigate former ice-sheet dynamics. Here, from a core retrieved in the BS, we combine the use of neodymium isotopes, high-resolution elemental analysis, and biomarkers to trace changes in sediment provenance and river runoff. We reveal cyclic releases of meltwater originating from Lake Disna, a proglacial lake linked to the FIS during Heinrich Stadial 1. Regional interactions within the climate–lake–FIS system, linked to changes in the availability of...
Tipo: Text Palavras-chave: Ice dynamics; Meltwater routing; European hydrographic network.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00134/24489/22516.pdf
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Black Sea "Lake" reservoir age evolution since the Last Glacial - Hydrologic and climatic implications ArchiMer
Soulet, Guillaume; Menot, Guillemette; Garreta, Vincent; Rostek, Frauke; Zaragosi, Sebastien; Lericolais, Gilles; Bard, Edouard.
Chronologies of sediments that document the last glacial history of the Black Sea "Lake" are hampered by issues relating to reservoir age. Regulated by basin hydrology, reservoir ages represent a tool that could potentially be used to better understand the response of Black Sea "Lake" hydrology to climate change. Therefore, deciphering reservoir age evolution is crucial both for better constraining the basin chronological framework and for providing new insights into our understanding of Black Sea "Lake" hydrology. By tuning a meaningful new high-resolution geochemical dataset (obtained from core MD04-2790) to a climate reference record, here, we propose a reliable chronology spanning the last 32 kyr BP. The chronology is compared to a large AMS...
Tipo: Text Palavras-chave: Black Sea; Reservoir age; Radiocarbon; Last Glacial; Last Deglaciation; Paleoclimate.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15379/12817.pdf
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Coastal sand dunes at 100m under sea level as proof of a post Younger-Dryas Black Sea lowstand ArchiMer
Lericolais, Gilles; Bulois, C; Gillet, H.
A 3D geometric interpretation of very high-resolution seismic Chirp profiles acquired on the Romanian shelf demonstrates that the last climate change known during Holocene times was well recorded in the Black Sea basin and particularly provides a good record of its water level fluctuations.
Tipo: Text Palavras-chave: Pseudo 3D; Seismic sequences; Rapid transgression; Forced regression.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/acte-4936.pdf
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Cold seeps along the main Marmara Fault in the Sea of Marmara (Turkey) ArchiMer
Zitter, T; Henry, P; Aloisi, G; Delaygue, G; Cagatay, M; De Lepinay, B; Al Samir, M; Fornacciari, F; Tesmer, M; Pekdeger, A; Wallmann, K; Lericolais, Gilles.
The main Marmara Fault exhibits numerous sites of fluid venting, observed during previous cruises and in particular with R.O.V. VICTOR during the MARMARASCARPS cruise (2002). Long CALYPSO cores were recovered near active vents and at reference sites during the MARMARA-VT cruise (2004), together with echosounder sub-bottom profiles (frequency of 3.5kHz). We compiled R.O.V. video observations from MARMARASCARPS cruise and show that all known seeps occur in relationship with strike-slip faults, providing pathways for fluid migration. Among the main active sites, a distinction is made between gas seeps and water seeps. At gas seeps, bubble emissions at the seafloor or disturbed echofacies on sounder profiles demonstrate the presence of free methane gas at a...
Tipo: Text Palavras-chave: High permeability pathways; Fault scarp; Seafloor observations; Cold seeps; Sea of Marmara.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4065.pdf
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Comments to Westaway and Bridgland - 'Causes, consequences and chronology of large-magnitude palaeoflows in Middle and Late Pleistocene river systems of northwest Europe' ArchiMer
Toucanne, Samuel; Zaragosi, S.; Eynaud, F.; Bourillet, Jean-francois; Lericolais, Gilles; Gibbard, P. L..
Westaway and Bridgland (Earth Surface Processes and Landforms 35: 1071–1094, 2010) discuss the causes, the consequences and the chronology of large-magnitude palaeoflows in Pleistocene river systems of northwest Europe. Based on their calculations, these authors suggest that the combined effects of meltwater from Alpine glaciers, rainfall, snowmelt and melting of permafrost during Heinrich Events (HEs) explain the large-magnitude discharges of the Fleuve Manche palaeoriver which punctuated the last glacial period. This comment identifies some approximations and inconsistencies regarding (i) the timing of the last massive Fleuve Manche palaeoriver discharge and its relation to the de-glacial pattern of the British-Irish Ice Sheet (Point 1); (ii) the...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00041/15205/12532.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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Constraints on Black Sea outflow to the Sea of Marmara during the last glacial-interglacial transition ArchiMer
Major, Candace; Ryan, William; Lericolais, Gilles; Hajdas, Irka.
New cores from the upper continental slope off Romania in the western Black Sea provide a continuous, high-resolution record of sedimentation rates, clay mineralogy, calcium carbonate content, and stable isotopes of oxygen and carbon over the last 20000 yr in the western Black Sea. These records all indicate major changes occurring at 15 000, 12 800, 8400, and 7 100 yr before present. These results are interpreted to reflect an evolving balance between water supplied by melting glacial ice and other river runoff and water removed by evaporation and outflow. The marked retreat of the Fennoscandian and Alpine ice between 15 000 and 14 000 yr is recorded by an increase in clays indicative of northern provenance in Black Sea sediments. A short return toward...
Tipo: Text Palavras-chave: Clay mineralogy; Stable isotopes; Sapropel; Younger Dryas; Deglaciation.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-473.pdf
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Environmental significance of microbialites in reef environments during the last deglaciation ArchiMer
Camoin, G; Cabioch, G; Eisenhauer, A; Braga, J; Hamelin, B; Lericolais, Gilles.
In situ microbialites occurring in reef rocks dredged between 80 and 130 in water depth on the modern fore-reef slopes of Tahiti and the Marquesas islands yield ages ranging from 17,100 2900 to 4410 2250 years BP, suggesting that they played a prominent role during the last deglacial sea level rise. Microbialites developed in both shallow and deep water depositional environments where they characterize various zones of the reef tracts (reef crests, upper reef slopes, deep fore-reef slopes), reflecting contrasting scenarios of microbialite development involving ''reefal microbialites'' in shallow-water settings and ''slope microbialites'' that formed in environments deeper than 1020 in and extending down to more than 100 m. Reefal microbialites...
Tipo: Text Palavras-chave: Sea level changes; Nutrients; French polynesia; Holocene; Last deglaciation; Microbialites; Coral reefs.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-4204.pdf
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Evolution du fleuve Manche depuis l'oligocène : stratigraphie et géomorphologie d'une plateforme continentale en régime périglaciaire ArchiMer
Lericolais, Gilles.
Ce travail propose un scénario de reconstruction de l'histoire du fleuve Manche depuis son origine supposée oligocène, basé sur l'interprétation de données numériques de géophysique très haute résolution (sismique sparker, et multifaisceaux EM100) acquises par l'IFREMER au cours d'une série de campagnes qui ont été réalisées dans le cadre du programme SEDIMANCHE. Les techniques de traitement utilisées (sismique, imagerie et cartographique) apportent des éléments nouveaux témoins de l'existence et du passé du fleuve qui a drainé au cours des périodes de bas niveau marin plio-quaternaires, une grande partie de l'Europe du Nord-Ouest.
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Ano: 1997 URL: http://archimer.ifremer.fr/doc/00034/14504/11848.pdf
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Evolution of the Danube Deep-Sea Fan since the Last Glacial Maximum: insights into water level fluctuations in the Black Sea ArchiMer
Constantinescu, Adriana; Toucanne, Samuel; Dennielou, Bernard; Jorry, Stephan; Panin, Nicolae; Lericolais, Gilles.
The Danube deep-sea fan is one of the most extensive deep-sea sedimentary systems in Europe. It lies in the base of slope of the north-western margin of the Black Sea, in front of Viteaz Canyon. Since the work of Popescu (2002) the detailed morphology and architecture of the fan is well known. During lowstand periods, the fan was fed by the Viteaz Canyon, which was directly connected to the Danube River. The fan has developed an impressive channel-levees network which is characterized by seven major channel avulsions (Popescu, 2002, Lericolais et al., 2013). Despite the numerous sedimentary cores retrieved during the Blason (1998, 2002) and Assemblage (2004) oceanographic cruises, the details of the factors controlling the turbiditic activity of the Danube...
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Ano: 2014 URL: http://archimer.ifremer.fr/doc/00202/31277/29684.pdf
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Evolution of the danube deep-sea fan since the last glacial maximum: New insights into Black Sea water-level fluctuations ArchiMer
Constantinescu, Adriana; Toucanne, Samuel; Dennielou, Bernard; Jorry, Stephan; Mulder, T.; Lericolais, Gilles.
The Danube Deep-Sea Fan (NW Black Sea) is one of the most developed deep-sea sediment depositional systems in Europe. Although the morphology and the architecture have been widely described in the past years, little is known about the stratigraphy of this depositional system. For the late Quaternary, this results from the lack of significant stratigraphic markers, the scarcity of radiocarbon ages and the difficulty in constraining reservoir ages. Recent robust quantification of reservoir ages has allowed the construction of a new stratigraphic framework for the Black Sea from the end of the last glacial period to the Holocene, thus giving the opportunity to correlate sedimentological and geochemical features previously described on the NW Black Sea margin...
Tipo: Text Palavras-chave: Danube deep-sea fan; Turbidites; Stratigraphy; Last glacial maximum; Termination 1; Water-level fluctuations.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00271/38236/64238.pdf
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Glacial hydrologic conditions in the Black Sea reconstructed using geochemical pore water profiles ArchiMer
Soulet, Guillaume; Delaygue, G.; Vallet-coulomb, C.; Boettcher, M. E.; Sonzogni, C.; Lericolais, Gilles; Bard, E..
Chloride and delta O-18 compositions of interstitial water extracted from a long sediment core retrieved from the NW coast of the Black Sea allowed us to constrain the main hydrologic changes of the Back Sea during the Late Pleistocene and Holocene. Prior to its reconnection with the Mediterranean Sea (through the Marmara Sea) at approximately 9000 calendar yr before present (9 ka cal BP), the Black Sea has evolved as a fresh to brackish water lake. At the time of reconnection, hydrologic changes were drastic. Bottom water salinities changed from a few psu (practical salinity unit) to similar to 22 psu. Since solutes in the interstitial water column within sediments are advected and diffused the measured concentrations do not reflect those of past bottom...
Tipo: Text Palavras-chave: Black Sea; Interstitial water; Salinity; Water isotopes; Advection/diffusion modelling; Deglaciation.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12239/9798.pdf
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High frequency sea level fluctuations recorded in the Black Sea since the LGM ArchiMer
Lericolais, Gilles; Bulois, C.; Gillet, Herve; Guichard, F..
This paper presents a 3D geometric interpretation of very high resolution seismic Chirp profiles acquired on the Romanian shelf during ASSEMBLAGE European Project. The results provide a solid record of the Black Sea Last Glacial Maximum (LGM) water level fluctuations. This pseudo-3D seismic interpretation shows that the Black Sea lacustrine shelf deposits form a significant basinward-prograding wedge system. on top of these prograding sequences is a set of sand dunes that delineates a wave cut-terrace like feature around the isobath -100 m. Landward of this dune field are small depressions containing barkhan-like bodies. The upper part of the last prograding sequence is incised by anastomosed channels which end in the Danube (Viteaz) canyon which are also...
Tipo: Text Palavras-chave: Black Sea; Enclosed basin; Forced regression; Rapid transgression; Sea level changes.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6587.pdf
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Holocene biostratigraphy and paleoenvironmental changes in the Black Sea based on calcareous nannoplankton ArchiMer
Giunta, Simona; Morigi, Caterina; Negri, Alessandra; Guichard, Francois; Lericolais, Gilles.
In this study, detailed micropaleontological analyses were carried out on 270 samples from eight piston cores collected in the Black Sea. The primary goal was to elucidate the Late Quaternary evolution of the Black Sea, specifically to refine its biostratigraphy and to explore the Holocene paleoenvironmental changes. Three intervals were recognized in all the cores studied, irrespective of whether they were from the basin or the shelf. These intervals are characterized, from old to young, by the spotty occurrence, the presence and the local acme of Emiliania huxleyi respectively. Moreover, the species Braarudosphaera bigelowii is, in contrast to the younger units, absent in the oldest unit. The co-occurrence of the two marine species E. huxleyi and B....
Tipo: Text Palavras-chave: Stratigraphy; Late Quaternary; Black Sea; Calcareous nannoplankton.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2674.pdf
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Importations et remaniements de thanatofaunes dans les sables de la plate-forme profonde des approches occidentales de la Manche ArchiMer
Reynaud, Jean-yves; Lauriat-rage, Agnès; Tessier, Bernadette; Neraudeau, Didier; Braccini, Eric; Carriol, René-pierre; Clet-pellerin, Martine; Moullade, Michel; Lericolais, Gilles.
Macro- and micro-faunas are reported from six gravity cores collected at a mean depth of 150 m in the surficial deposits of the Kaiser sand bank in the Southern Western Channel Approaches. These are bivalves (mainly), gastropods, echinids, crustaceans and foraminifers. These fauna present a very rich association of numerous, well preserved species from various ecological settings. Such an association is commonly reported from the continental shelf of the last transgressive cycle. In addition, the sediment comprises two imported faunal associations. The first one corresponds to thanatocaenoses of Pliocene/lowermost Pleistocene and Weichselian age, reworked respectively from the underlying celtic incised valley fills and the Celtic Sand Banks. The absence of...
Tipo: Text Palavras-chave: Continental shelf; Thanatofauna; Sea level; Reworking; Transport.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00146/25682/23843.pdf
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Inferring denudation variations from the sediment record; an example of the last glacial cycle record of the Golo Basin and watershed, East Corsica, western Mediterranean sea ArchiMer
Calves, Gerome; Toucanne, Samuel; Jouet, Gwenael; Charrier, Simon; Thereau, Estelle; Etoubleau, Joel; Marsset, Tania; Droz, Laurence; Bez, M.; Abreu, V.; Jorry, Stephan; Mulder, T.; Lericolais, Gilles.
Geophysical data and sampling of the Golo Basin (East Corsica margin) provide the opportunity to study mass balance in a single drainage system over the last 130 kyr, by comparing deposited sediments in the sink and the maximum eroded volume in the source using total denudation proxies. Evaluation of the solid sediments deposited offshore and careful integration of uncertainties from the age model and physical properties allow us to constrain three periods of sedimentation during the last climatic cycle. The peak of sedimentation initiated during Marine Isotopic Stage (MIS) 3 (ca. 45 ka) and lasted until late in MIS 2 (ca. 18 ka). This correlates with Mediterranean Sea palaeoclimatic records and the glaciation in high altitude Corsica. The yield of solid...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00087/19779/17480.pdf
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Internal architecture of an incised valley-fill on a wave- and tide-dominated coast (the Leyre incised valley, Bay of Biscay, France). ArchiMer
Fenies, Hugues; Lericolais, Gilles.
internal architecture of an incised valley-fill on a wave- and tide-dominated coast (the Leyre incised valley, Bay of Biscay, France). The Leyre incised valley shows a specific strata architecture related to its wave- and tide-dominated depositional environment. The low-stand systems tract has been totally eroded by the tidal ravinement surface and the valley is entirely filled by the transgressive systems tract. The Leyre and the Gironde incised valleys have been formed within the same depositional environment and the same stratigraphic framework. Consequently, the description of the internal architecture of the Leyre incised valley enables to complete the stratigraphic model of the wave- and tide-dominated incised valleys set up by Allen et Posamentier...
Tipo: Text Palavras-chave: France; Bay of Biscay continental shelf; Arcachon Basin lagoon; Leyre estuary; High resolution seismic; Sequence stratigraphy; Incised valley; France; Plateau continental aquitain; Lagune du bassin d'Arcachon; Estuaire de la Leyre; Sismique haute résolution; Stratigraphie séquentielle; Vallée incisée.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-793.pdf
Registros recuperados: 44
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