HR: 0800h
AN: B31B-0991    [Abstracts]
TI: Possible Reaction Pathways for the Formation of Organic Compounds in Volcanic Hydrothermal Systems
AU: * Dumont, M
EM: marion.dumont@geo.su.se
AF: Stockholm University, Department of Geology and Geochemistry, Stockholm, 106 91 Sweden
AU: Holm, N G
EM: nils.holm@geo.su.se
AF: Stockholm University, Department of Geology and Geochemistry, Stockholm, 106 91 Sweden
AB: Conditions in volcanic hydrothermal systems (high temperature, high pressure and availability of metals for catalysis and redox control) make them perfect reactors for a broad range of organic synthesis reactions. In this study, the organic signatures of high temperature (240°C to 290°C) hydrothermal fluids from two very different environments are presented. The first group of samples is from the Rainbow vent field (36°14'N) on the Mid-Atlantic-Ridge, with low pH and organic-rich fluids resulting from the circulation of seawater through ultramafic rocks. The second group of samples is from Iceland, a basaltic ridge-hotspot system, where the original fluid percolating through the rocks ranges from seawater in the Reykjanes Peninsula to meteoric water in the Nesjavellir area. Tentative reaction pathways, based on organic synthesis literature are suggested to account for the presence of some of the organic compounds commonly found in those fluids.
DE: 0450 Hydrothermal systems (1034, 3017, 3616, 4832, 8135, 8424)
DE: 1032 Mid-oceanic ridge processes (3614, 8416)
DE: 1034 Hydrothermal systems (0450, 3017, 3616, 4832, 8135, 8424)
DE: 1055 Organic and biogenic geochemistry
SC: Biogeosciences [B]
MN: Fall Meeting 2005