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	Provedor de dados ArchiMer (2) Autor Cannat, Mathilde (1) Charlou, Jean-luc (1) Donval, Jean-pierre (1) Fouquet, Yves (1) Holm, Nils G. (1) Konn, Cecile (1) Normand, Alain (1) Ondreas, Helene (1) Mais... Palavra-chave Ultramafic rocks (2) Ashadze (1) Extraction (1) Hydrothermal activity (1) Hydrothermal explosion crater (1) Hydrothermal fluids (1) Mid-Atlantic Ridge (1) Organic compounds (1) Sample preparation (1) Mais... Tipo do documento Text (2) Ano 2012 (2) País France (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Characterisation of dissolved organic compounds in hydrothermal fluids by stir bar sorptive extraction - gas chomatography - mass spectrometry. Case study: the Rainbow field (36 degrees N, Mid-Atlantic Ridge) ArchiMer Konn, Cecile; Charlou, Jean-luc; Donval, Jean-pierre; Holm, Nils G.. The analysis of the dissolved organic fraction of hydrothermal fluids has been considered a real challenge due to sampling difficulties, complexity of the matrix, numerous interferences and the assumed ppb concentration levels. The present study shows, in a qualitative approach, that Stir Bar Sorptive Extraction (SBSE) followed by Thermal Desorption - Gas Chromatography - Mass Spectrometry (TD-GC-MS) is suitable for extraction of small sample volumes and detection of a wide range of volatile and semivolatile organic compounds dissolved in hydrothermal fluids. In a case study, the technique was successfully applied to fluids from the Rainbow ultramafic-hosted hydrothermal field located at 36 degrees 14'N on the Mid-Atlantic Ridge (MAR). We show that... Tipo: Text Palavras-chave: Sample preparation; Extraction; Organic compounds; Hydrothermal fluids; Ultramafic rocks. Ano: 2012 URL: http://archimer.ifremer.fr/doc/00114/22514/20196.pdf Geological context and vents morphology of the ultramafic-hosted Ashadze hydrothermal areas (Mid-Atlantic Ridge 13 degrees N) ArchiMer Ondreas, Helene; Cannat, Mathilde; Fouquet, Yves; Normand, Alain. Recent ROV dives and high-resolution bathymetric data acquired over the Ashadze fields on the Mid-Atlantic Ridge (13 degrees N) allow us to derive constraints on the regional and local geological setting of ultramafic-hosted hydrothermal fields. The active vent fields of Ashadze hydrothermal fields are located in the western axial valley wall, downslope from the termination of a prominent corrugated surface and in a transitional domain with respect to ridge segmentation. The study of the shipboard and ROV bathymetry shows that decameter (100 m by 60 m) to kilometer-scaled rockslides shape the axial valley wall slopes in this region. The Ashadze 1 vent field occurs on a coherent granular landslide rock mass that is elongated in an E-W direction. The Ashadze... Tipo: Text Palavras-chave: Ashadze; Mid-Atlantic Ridge; Hydrothermal activity; Hydrothermal explosion crater; Ultramafic rocks. Ano: 2012 URL: http://archimer.ifremer.fr/doc/00111/22223/19895.pdf Registros recuperados: 2 Primeira ... 1 ... Última

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