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Registros recuperados: 7
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Constraints on the dynamic of gas hydrates in Niger Delta sediments from U/Th dating of cold-seep carbonates ArchiMer
Henderson, Gm; Bayon, Germain; Pierre, C; Caprais, Jean-claude; Voisset, Michel.
Tipo: Text
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3587.pdf
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Enhanced rainfall in the Mediterranean region during the last sapropel event ArchiMer
Kallel, N; Paterne, M; Duplessy, Jc; Vergnaudgrazzini, C; Pujol, C; Labeyrie, L; Arnold, M; Fontugne, M; Pierre, C.
Sea-surface temperature (SST) estimates for the last 10,000 years have been derived from foraminiferal fauna variations in ten cores from the Mediterranean Sea. For the eastern cores, modern analogs of fossil assemblages are found in the eastern Mediterranean Sea. In the Alboran and Tyrrhenian Seas, the bet analogs originate from modern fauna located either in the western Mediterranean Sea or in the North Atlantic Ocean. During the last sapropel event, centred at about 8,000 years B.P., SSTs were similar to present in the eastern basin, whereas they were colder than today by about 1.5 degrees C in the Alboran Sea and 2.5 degrees C in the Tyrrhenian Sea. Oxygen isotope measurements agree with ecological studies to show that Globigerina bulloides and...
Tipo: Text
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00093/20427/18094.pdf
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Paleo-environment of northeast atlantic during cenozoic - oxygen and carbon isotope analyses at dsdp sites-398, site-400-a and site-401 ArchiMer
Vergnaudgrazzini, C; Pierre, C; Letolle, R.
Tipo: Text
Ano: 1978 URL: http://archimer.ifremer.fr/doc/00123/23394/21221.pdf
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Seafloor geological studies above active gas chimneys off Egypt (Central nile deep sea fan) ArchiMer
Dupre, Stephanie; Woodside, J; Foucher, Jean-paul; De Lange, G; Mascle, J; Boetius, A; Mastalerz, V; Stadnitskaia, A; Ondreas, Helene; Huguen, C; Harmegnies, Francois; Gontharet, Swanne; Loncke, L; Deville, E; Niemann, H; Omoregie, E; Olu, Karine; Fiala Medioni, A; Dahlmann, A; Caprais, Jean-claude; Prinzhofer, A; Sibuet, Myriam; Pierre, C; Damste, J.
Four mud volcanoes of several kilometres diameter named Amon, Osiris, Isis, and North Alex and located above gas chimneys on the Central Nile Deep Sea Fan, were investigated for the first time with the submersible Nautile. One of the objectives was to characterize the seafloor morphology and the seepage activity across the mud volcanoes. The seepage activity was dominated by emissions of methane and heavier hydrocarbons associated with a major thermal contribution. The most active parts of the mud volcanoes were highly gas-saturated (methane concentrations in the water and in the sediments, respectively, of several hundreds of nmol/L and several mmol/L of wet sediment) and associated with significantly high thermal gradients (at 10 m below the seafloor,...
Tipo: Text Palavras-chave: Seafloor morphology; Methane; Authigenic carbonate precipitation; Gas chimneys; Mud breccia; Mud volcanoes; Fluid seepage; Nile fan.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-4455.pdf
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Sr/Ca and Mg/Ca ratios in Niger Delta sediments: Implications for authigenic carbonate genesis in cold seep environments ArchiMer
Bayon, Germain; Pierre, C; Etoubleau, Joel; Voisset, Michel; Cauquil, E; Marsset, Tania; Sultan, Nabil; Le Drezen, Eliane; Fouquet, Yves.
We report on a reconnaissance analysis of the geochemical composition of authigenic carbonates and sediment samples collected from various seepage sites on the Niger deep-sea fan. Our aim has been to investigate whether evidence for the presence of authigenic carbonates and gas hydrates within sediments is discernible from solid-phase sediment geochemistry. We show that sedimentary Sr/Ca and Mg/Ca ratios can be used to infer the presence of authigenic aragonite (Sr-rich) and Mg-rich carbonate phases (high-Mg calcite, dolomite) in cold seep settings. Using Sr/Ca and Mg/Ca ratios, the proportion (wt.%) of authigenic carbonates in Niger Fan sediments can be calculated from a mixing model between sediment fractions of terrigenous material, biogenic calcite,...
Tipo: Text Palavras-chave: Niger Delta; Gas hydrates; Cold seeps; Mg/Ca; Sr/Ca; Authigenic carbonates.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2696.pdf
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The influence of Congo River discharges in the surface and deep layers of the Gulf of Guinea ArchiMer
Vangriesheim, Annick; Pierre, C; Aminot, Alain; Metzl, N; Baurand, F; Caprais, Jean-claude.
The main feature of the Congo-Angola margin in the Gulf of Guinea is the Congo (ex-Zaire) deep-sea fan composed of a submarine canyon directly connected to the Congo River, a channel and a [sediment] lobe area. During the multi-disciplinary programme called BIOZAIRE conducted by Ifremer from 2000 to 2005, two CTD-O2 sections with discrete water column samples were performed (BIOZAIRE3 cruise: 2003-2004) to study the influence of the Congo River discharges, both in the surface layer and in the deep and near-bottom layers. The surface layer water is greatly diluted with river water that has a heavy particle load. The deep layer is affected by episodic turbidity currents that flow in the deep Congo channel and reach deep areas far from the coast. Previous...
Tipo: Text Palavras-chave: DIC; Stable isotopes; Nutrient anomaly; Oxygen anomaly; Congo canyon; Gulf of Guinea.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6737.pdf
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Variability of delta-c-13 of sigma-co2 in ocean waters of the equatorial pacific ArchiMer
Laubelenfant, E; Pierre, C.
The transect from East to West Pacific realized along the equator during the Alize 2 cruise (January-March 1991) offers a unique opportunity to evaluate the effect of the equatorial upwelling on the partial derivative(13)C values of Sigma CO2 in oceanic waters. The surface partial derivative(13)C distribution from 95 degrees W to 165 degrees E is characterized by a general increase from 0.90 to 1.54 parts per thousand which parallels the temperature rise from 23 to 30 degrees C, both giving a signature of the upwelling and of the westward advection of superficial waters: the C-13 depletion in the Sigma CO2 marks the progressive influence of upwelled waters which are rich in C-13-depleted CO2 generated by organic matter remineralization. The vertical...
Tipo: Text
Ano: 1994 URL: http://archimer.ifremer.fr/doc/00099/21016/18642.pdf
Registros recuperados: 7
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