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Registros recuperados: 6
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Biotracers and geotracers of depositional events in NW Mediterranean margin over the past two centuries ArchiMer
Giresse, P; Buscail, R; Charriere, B; Abassi, A; Masque, P; Sanchez-cabeza, Ja.
A detailed sedimentological and geochemical investigation was performed on slope sediments collected from the Gulf of Lions and Catalonian margins and from the northern Balearic margin. The study was based on cores, about 50 cm long. Various physiographic sites (canyons, open slopes) were selected according to the available sediment accumulation rates obtained with the Pb-210 geochronological method. At a short time scale, various parts of the slope were characterized by muddy hemipelagic sediment. Sedimentological data suggested that deposition was continuous. Total organic carbon and its hydrolysable fraction decreased downcore. Significant increase of C/N ratio downcore resulted from an early diagenetic process in response to the burial effect. However...
Tipo: Text Palavras-chave: Méditerranée nord-occidentale; Vitesse de sédimentation; Processus gravitaires; Carbone organique; 210Pb; North-western Mediterranean; Sedimentation rate; Gravity-induced process; Organic carbon; Pb-210.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43335/42892.pdf
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Échantillons rocheux provenant de « volcans de boue » de Méditerranée orientale ArchiMer
Huguen, Caroline; Benkhelil, J; Giresse, P; Mascle, Jean; Muller, C; Woodside, John; Zitter, T; The Medinaut Scientific Party,.
In the eastern Mediterranean, numerous argilo-kinetic manifestations, commonly named 'mud volcanoes', have been identified and studied in some detail during the last twenty years using several techniques. The Medinaut survey (December 1998) has provided new insights into this phenomenon through twenty deep dives performed with the submersible Nautile within two areas particularly active in terms of mud expulsions: the central Mediterranean ridge south of Crete, and the Anaximander mountains area, south of Turkey. The morphology, petrography, microstructure and biostratigraphy of different clasts sampled in the two areas helped to better understand the mud volcano formation and subsequent evolution. Paleoenvironmental conditions, ranging from deep marine...
Tipo: Text Palavras-chave: Clasts; Eastern Mediterranean; Deep dives; 'mud volcanoes'.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00068/17931/15469.pdf
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Late Holocene multisource material input into the Aegean Sea: depositional and post-depositional processes ArchiMer
Giresse, P; Buscail, R; Charriere, B.
The upper similar to50 cm sediments in the deep-sea Aegean Sea were generally deposited through hemipelagic rain as indicated by paucity of terrigenous sand-sized particles, abundance of clay-sized materials and lack of turbiditic beds. However, quartz sand-sized grains, black debris, higher C org content and ON ratio attest to a significant river-borne supply in the North Aegean Trough. Recurrent gravity-induced transfers from the shelf break are evidenced through various markers of coastal deposition dating back the last low-stand (Characea oogons, Elphidium crispum, Ammonia beccarii, glauconitic grains, evolved organic matter). Especially, this deposition induced significant rise of the C/N ratio of successive layers. The top of ash layers of the Minoan...
Tipo: Text Palavras-chave: Halocène tardif; Dépôt; Mer Egée; Late Holocene; Deposit; Aegean Sea.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00321/43256/42987.pdf
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Organic fluxes of Cameroonian rivers into the Gulf of Guinea: a quantitative approach to biodegradation in estuary and plume ArchiMer
Giresse, P; Cahet, G.
The modern organic carbon flux of the Sanaga River and the rivers around the Bay of Douala is estimated to be 0.62-0.79 x 10(6) t yr(-1). In reality, mean Holocene sedimentation of organic carbon, including a presumed low biological production in the euphotic zone, is only 41-52 % of this-value. Substantial biodegradation in the salty and brackish turbid waters in the estuaries affects the POC and DOC arid corresponds to the highest bacterial densities. Between salinity 6 and 21, the data indicate a non-conservative behaviour of the suspended: and dissolved organic matter (POC and DOG). A breakdown of nearly 50 % of organic carbon is observed both in suspended matter of the open sea and in marine muds of near equal grain-size distribution. Incubation...
Tipo: Text
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20467/18139.pdf
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Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean) ArchiMer
Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf
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Évolution géométrique des supports de glauconitisation ; application à la reconstitution de paléoenvironnement ArchiMer
Giresse, P; Lamboy, M; Odin, Gs.
Tipo: Text
Ano: 1980 URL: http://archimer.ifremer.fr/doc/00121/23268/21097.pdf
Registros recuperados: 6
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