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	Provedor de dados ArchiMer (3) Autor Bouillon, S. (1) Chaduteau, Carine (1) Charlou, Jean-luc (1) Dehairs, F. (1) Donval, Jean-pierre (1) Holm, N. G. (1) Konn, Cecile (1) Konn, Cécile (1) Mais... Palavra-chave Serpentinisation (3) Hydrothermal (2) Origin of life (2) Ultramafic (2) Advection (1) Composés organiques (1) Fluid (1) Fluide (1) Geochemistry (1) Géochimie (1) Helium (1) Hydrocarbons (1) Hydrocarbures (1) Hélium (1) Manteau (1) Mantle (1) Marge (1) Margin (1) Methane (1) Mud volcano (1) Mais... Tipo do documento Text (3) Ano 2009 (2) 2008 (1) País France (3) Idioma Inglês (2) Francês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Origin of organic compounds in fluids from ultramafic-hosted hydrothermal vents of the Mid-Atlantic Ridge ArchiMer Konn, Cécile. Natural gas, primarily methane (CH4), is produced in substantial amounts in ultramafic-hosted hydrothermal systems. These systems could also generate oil (heavier hydrocarbons) and the first building blocks of life (prebiotic molecules). In the presence of iron bearing minerals, serpentinisation reactions generate H2. Subsequently, CH4 could be synthesised by Fischer-Tropsch Type (FTT) reaction (4H2 + CO2 -> CH4 + 2H2O) which is an abiotic process. This has lead to the idea of abiotic formation of larger organic molecules. Both thermodynamics and laboratory work support this idea, yet field data have been lacking. This study focuses on determining the organic content of fluids from ultramafic-hosted hydrothermal systems from the Mid-Atlantic Ridge (MAR)... Tipo: Text Palavras-chave: Origin of life; Geochemistry; Hydrothermal; Ultramafic; Organic compounds; Hydrocarbons; Serpentinisation; Origine de la vie; Géochimie; Systèmes hydrothermaux; Ultrabasique; Composés organiques; Hydrocarbures; Serpentinisation. Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-6939.pdf Origine et circulation des fluides dans les sédiments des marges. Contribution de l'hélium et du méthane dans la compréhension des processus. Étude de 2 zones actives ArchiMer Chaduteau, Carine. Fluid migration is a very important process in marine sediments on margins. Studying fluids is fundamental to constrain the energy potential of margins. Methane is the predominant gas in marine sediments, deriving primarily from the degradation of organic matter. However methane could be also generated through the serpentinization of mantle rocks underlying the sedimentary cover in some specific geodynamical settings. One way to test this hypothesis is to use helium isotopes, which are known to be powerful tracers of the fluid-mantle interaction. To this purpose, a new method has been developed for the sampling and the quantitative extraction of dissolved helium from sediment pore-waters. During the Zairov2 and Vicking cruises, samples were collected in... Tipo: Text Palavras-chave: Mantle; Serpentinization; Advection; Mud volcano; Pockmark; Methane; Helium; Fluid; Margin; Manteau; Serpentinisation; Advection; Volcan de boue; Pockmark; Méthane; Hélium; Fluide; Marge. Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-3724.pdf Hydrocarbons and oxidized organic compounds in hydrothermal fluids from Rainbow and Lost City ultramafic-hosted vents ArchiMer Konn, Cecile; Charlou, Jean-luc; Donval, Jean-pierre; Holm, N. G.; Dehairs, F.; Bouillon, S.. The first building blocks of life could be produced in ultramafic-hosted hydrothermal systems considering the large amounts of hydrogen and methane generated by serpentinisation and Fischer-Tropsch-Type synthesis, respectively, in those systems. The purpose of this study was to detect and characterise organic molecules in hydrothermal fluids from ultramafic-hosted hydrothermal systems in the Mid-Atlantic Ridge (MAR) region. During the EXOMAR cruise 2005, fluids from the Rainbow (36°14'N) and the Lost City (30°N) hydrothermal fields were collected and treated by Stir Bar Sorptive Extraction (SBSE) and Solid Phase Extraction (SPE). The extracts were analysed by Thermal Desorption-Gas Chromatography-Mass Spectrometry (TD-GC-MS) and GC-MS, respectively.... Tipo: Text Palavras-chave: Serpentinisation; Organic; Ultramafic; Hydrothermal; Origin of life. Ano: 2009 URL: http://archimer.ifremer.fr/doc/00067/17828/15576.pdf Registros recuperados: 3 Primeira ... 1 ... Última

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