Carbonate authigenesis and worm tube mineralization [Elektronische Ressource] : biogeochemical and geobiological processes at methane seeps on the Congo deep-sea fan / vorgelegt von Antonie Haas

Antonie Zimmerman

Description

Carbonate authigenesis and worm tube mineralization- biogeochemical and geobiological processes at methane seeps on the Congo deep-sea fan Dissertation zur Erlangung des Doktorgrades der Naturwissenschaften am Fachbereich Geowissenschaften der Universität Bremen vorgelegt von Antonie Haas Bremen, August 2008 Tag des Kolloquiums: 14. Oktober 2008 Gutachter: Prof. G. Bohrmann Prof. J. Peckmann Prüfer: R. Rendle-Bühring Prof. G. Mollenhauer AbstractAbstractThis thesis represents an approach to describe biogeochemical and geobiological processes during carbonate authigenesis at the Kouilou methane seeps on the northern Congo Fan off southwest Africa. The work comprises the analyses of methane derived limestones, the formation of carbonates modified by macroorganisms, and the diagenetic mineralization of vestimentiferan worm tubes. In high agreement with other methane seeps, it could be shown that carbonate formation is initially induced by microbial activity of anaerobic methane oxidizing (AOM) consortia. Aragonite and high-Mg-calcite are the carbonate minerals of these carbonate structures. The principle factors in respect of carbonate formation and mineralogy are i.) methane flux intensity ii.) sulfate concentration and iii.) the aggregation of specific AOM consortia.

Informations

• Publié par: universitat_bremen
• Publié le: 01 janvier 2008
• Nombre de lectures: 41
• Langue: English
• Poids de l'ouvrage: 12 Mo

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