HR: 17:30h
AN: OS42C-07    [PDF]
TI: Mud volcanoes and gas Hydrates in the Black Sea - new Data From Dvurechenskii mud Volcano
AU: * Bohrmann, G
EM: gbohrmann@uni-bremen.de
AF: Department of Geosciences, University of Bremen, Klagenfurter Str., Bremen, 28359 Germany
AU: Ivanov, M
EM:
AF: UNESCO Center for Marine Geosciences, Moskow State University, Vorobjevi, Moskow, 119899 Russian Federation
AU: Foucher, J
EM:
AF: IFREMER, Geosciences Marines, BP 70, Plouzane, 29280 France
AU: Spiess, V
EM:
AF: Department of Geosciences, University of Bremen, Klagenfurter Str., Bremen, 28359 Germany
AU: Abegg, F
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AU: Aloisi, G
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AU: Blinova, V
EM:
AF: UNESCO Center for Marine Geosciences, Moskow State University, Vorobjevi, Moskow, 119899 Russian Federation
AU: Drews, M
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AU: Greinert, J
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AU: Krastel, S
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AU: Wallmann, K
EM:
AF: GEOMAR Research Center, University Kiel, Wischhofstr.1-3, Kiel, 24148 Germany
AB: METEOR cruise M52/1 revealed the presence of gas hydrates in sediments of mud volcanoes in the Sorokin Trough of the Black Sea. Methane Hydrates were sampled from Dvurechenskii MV, Odessa MV, Yalta MV, and an unnamed mud volcano. Dvurechenskii mud volcano (DMV), a flat topped "mud pie"-type structure, seems to be presently active. Pore water in the sediments of DMV is enriched in several constituents such as ammonium and chloride. These elements can only have come from deeper sediments. High sediment temperatures of up to 16.5$\deg$C in close contact to the ambient bottom water of 9$\deg$C also suggest a strong activity. Steep gradients in temperature indicate a high fluid and/or mud flux in DMV which is independently deduced by the shape of pore water profiles. Active fluid expulsion sites are also evidenced by TV-sled observation, and a potential methane flux from the sediment to the bottom water was traced by measurements.
DE: 1099 General or miscellaneous
DE: 3015 Heat flow (benthic) and hydrothermal processes
DE: 4299 General or miscellaneous
SC: Ocean Sciences [OS]
MN: 2003 Fall Meeting