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Determination of sediment accumulation and mixing rates in the gulf of lions, mediterranean-sea ArchiMer
Zuo, Zz; Eisma, D; Berger, Gw.
Sediment mixing and accumulation rates in the Gulf of Lions were determined, applying the Pb-210 and Cs-137 dating methods to a total of 20 boxcores taken in 1987, 1988 and 1989. The distribution of excess Pb-210 profiles indicated the presence of surface mixed layers in the nearshore sediment cores which ranged from 3 to 15 cm. The apparent Pb-210 accumulation rates varied from 0.02 to 0.63 cm.yr-1 in this study area. Rates were highest near the river mouth of the Rhone and decreased with increasing water depth and increasing distance from the river mouth. Observed depths of Cs-137 penetration within the sediments were compared with depths predicted from the surface mixed layer thickness and the Pb-210 accumulation rate. These showed a general agreement...
Tipo: Text Palavras-chave: GULF OF LIONS; 210PB; 137CS; BIOLOGICAL MIXING; ACCUMULATION RATE.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21255/18868.pdf
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Lead and zinc as indicators for atmospheric and riverine particle-transport to sediments in the gulf of lions ArchiMer
Nolting, Rf; Helder, W.
Profiles of 0.1 N HCl leachable Pb and Zn in the sediments of the Gulf of Lions (North West Mediterranean) indicate that the concentrations of these metals are, especially in the vicinity of the triple-overdot Rhone outflow and in the Rhone plume, determined by input from the river. Solid phase Pb and Zn are more than three times higher than their pre-industrial background. At the offshore, deep ( > 2 000 m) stations in the Gulf of Lions, the surface concentration of solid phase Pb and Zn are about twofold enriched compared to background values. The profiles from these deep stations preserve, due to the restricted mobility of Pb and Zn and the lack of bioturbation in the sediment, a historical record of the increased atmospheric deposition of these...
Tipo: Text Palavras-chave: LEAD; ZINC; CONCENTRATION; SEDIMENTS; GULF OF LIONS.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/00101/21264/18875.pdf
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The use of mineral magnetic measurements to study the transport and sedimentation of particles in the Gulf of Lions (NW mediterranean) ArchiMer
Scoullos, Mj; Zeri, C.
Mineral magnetic and chemical studies indicate the impact and great importance of atmospheric versus riverine input of particles in the sediments of the Gulf of Lions and provide some strong indications about the presence of anthropogenic particles in offshore deep sediments of this region. The data indicate that Saharan dust and anthropogenic particles coexist at several depth intervals in the sediment, supporting the hypothesis that Saharan dust episodes could play an important role in facilitating deposition and coprecipitation of anthropogenic particles from the atmosphere and the water column.
Tipo: Text Palavras-chave: MAGNETIC PARAMETERS; SEDIMENTS; ANTHROPOGENIC; GULF OF LIONS; SAHARAN DUST.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00099/21074/18699.pdf
Registros recuperados: 3
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