Gérard Blanc

Research Field

ABSTRACT The chemical analysis by EMPEDS of 140 samples in cores from six Red Sea troughs and basins has led to the discovery in the Nereus Deep of high vanadium concentrations (up to 1.3% V 2 O 3 ) in several bulk samples, and to the isolation of a major magnetite phase. This vanado‐magnetite, remarkable for its high content of vanadium (mean = 1.45% V 2 O 3 ) and its lack of titanium, is frequently zoned, the V‐content decreasing toward the outer zones. Oxides with up to 42% V 2 O 3 , have also been found. Since the origin of the magnetite is clearly authigenic, its high vanadium and low titanium concentrations are traced back to the differential hydrothermal leaching of Fe—Ti‐oxides which occur profusely in basic eruptive rock clasts, actually present in some of the overlying seams.

Authigenic

10.1111/j.1365-3121.1989.tb00351.x

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Citations (16)

Deconvolution of trace element (As, Cr, Mo, Th, U) sources and pathways to surface waters of a gold mining-influenced watershed

The Science of The Total Environment (2009)

Cécile Grosbois Jörg Schäfer Hubert Bril Gérard Blanc A. Bossy

Trace element

Bedrock

Dilution

10.1016/j.scitotenv.2008.11.012

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Citations (28)

Hydrothermal activity in Atlantis II Deep (Red Sea) : Chemical and isotopic constraints from May 1985 water sampling. / Activité hydrothermale dans la fosse Atlantis II (Mer Rouge) : composition isotopique et chimique des eaux prélevées en mai 1985

Sciences Géologiques Bulletin (1994)

Gérard Blanc Jacques Boulègue Annie Michard

Activité hydrothermale dans la fosse Atlantis II (mer Rouge) : composition isotopique et chimique des eaux prélevées en mai 1985 L'activité hydrothermale est enregistrée isotopiquement et chimiquement dans l'eau profonde de la mer Rouge, au-dessus de la saumure supérieure de la fosse Atlantis II. Contrairement aux travaux antérieurs, les signatures chimiques isotopiques obtenues suggèrent que la résurgence des fluides hydrothermaux était probablement située sur le flanc du bassin SW en mai 1985, au-dessus de la limite supérieure des saumures. La comparaison des compositions isotopiques en hydrogène, oxygène et strontium avec celles des autres fluides de la mer Rouge et de ses marges suggère que l'eau de la fosse Atlantis II correspond à un mélange avec des paléo-eaux de mer du dernier optimum climatique, des eaux interstitielles des sédiments évaporitiques miocènes et des fluides hydrothermaux.

10.3406/sgeol.1994.1912

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Citations (1)

Metal mobilization in the Gironde Estuary (France): the role of the soft mud layer in the maximum turbidity zone

Marine Chemistry (2004)

Sébastien Robert Gérard Blanc Jörg Schäfer Gilbert Lavaux Gwénaël Abril

Turbidity

Trace metal

10.1016/s0304-4203(03)00088-4

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Citations (74)

Characterisation of the physico-chemical conditions during the settling of metalliferous sediments in the Atlantis-II Deep (Red Sea)

Chemical Geology (1990)

Pierre Anschutz Gérard Blanc Bertrand Fritz Jacques Boulègue

Halite

Anhydrite

Saturation (graph theory)

10.1016/0009-2541(90)90209-p

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Citations (0)

Effect of estuarine sediment resuspension on early diagenesis, sulfide oxidation and dissolved molybdenum and uranium distribution in the Gironde estuary, France

Chemical Geology (2007)

Stéphane Audry Gérard Blanc Jörg Schäfer Sébastien Robert

Authigenic

10.1016/j.chemgeo.2006.11.006

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Citations (53)

Short-term variations of platinum concentrations in contrasting coastal environments: The role of primary producers

Marine Chemistry (2020)

Mélina Abdou Teba Gil-Díaz Jörg Schäfer Charlotte Catrouillet Cécile Bossy

Diel vertical migration

10.1016/j.marchem.2020.103782

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Citations (20)

Dopaminergic Terminals in the Rat Cortex

Science (1973)

A.M. Thierry Gérard Blanc A Sobel L. Stinus J. Głowiński

The destruction of ascending noradrenergic pathways by bilateral microinjections of 6-hydroxydopamine made laterally to the pedunculus cerebellaris superior completely abolished the in vitro synthesis of [ 3 H]norepinephrine from L-[ 3 H]tyrosine in slices and in synaptosomes of the rat cortex. However, normal [ 3 H]dopamine synthesis could still be observed in both cortical preparations from animals with lesions. These results provide the first biochemical support for the existence of dopaminergic terminals independent of noradrenergic terminals in the rat cortex.

10.1126/science.182.4111.499

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Citations (503)

Mercury methylation in the sediments of a macrotidal estuary (Gironde Estuary, south-west France)

Estuarine Coastal and Shelf Science (2010)

Jörg Schäfer Sabine Castelle Gérard Blanc Aymeric Dabrin Matthieu Masson

Mercury

Sediment–water interface

Methylmercury

Biogeochemical Cycle

10.1016/j.ecss.2010.07.007

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