HR: 12:05h
AN: OS32A-08    [Abstracts]
TI: Isotope Studies on Cariaco Basin Methane
AU: * Kessler, J D
EM: jkessler@uci.edu
AF: University of California Irvine, Department of Earth System Science, Irvine, CA 92697-3100 United States
AU: Reeburgh, W S
EM: reeburgh@uci.edu
AF: University of California Irvine, Department of Earth System Science, Irvine, CA 92697-3100 United States
AU: Varela, R
EM: rvarela@edimar.edu
AF: Fundacion La Salle de Ciencias Naturales, Estacion de Investigaciones Marinas de Margarita, Porlamar, 6301 Venezuela
AB: We report the first measurements of d2H-CH4, d13C-CH4, and 14C-CH4 on water column and sediment samples from the Cariaco Basin. Previous studies on Cariaco Basin methane geochemistry consider release of diagenetic methane from sediments as the source of water column methane. Our observations indicate that a sediment diagenetic source is present, but that the water column methane inventory is dominated by an unexpected and previously unknown fossil methane source.
DE: 4805 Biogeochemical cycles (1615)
DE: 4820 Gases
DE: 4802 Anoxic environments
DE: 0322 Constituent sources and sinks
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting