R/V Professor Bogorov Cruise report: Cruise 37 POSETIV - Paramushir-Okhotsk Sea Expedition to Investigate Venting, Vladivostok - Vladivostok, September 23 - October 22, 1994.

Gaedicke, Christoph, Baranov, Boris and Lelikov, Evgeniy, eds. (1995) R/V Professor Bogorov Cruise report: Cruise 37 POSETIV - Paramushir-Okhotsk Sea Expedition to Investigate Venting, Vladivostok - Vladivostok, September 23 - October 22, 1994. Open Access . GEOMAR-Report, 042 . GEOMAR Forschungszentrum für marine Geowissenschaften, Kiel, 94 pp. DOI 10.3289/GEOMAR_REP_42_1995.

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Abstract

Since the discovery of fluid venting in the late seventies the processes involved in the marine
geochemical cycle, especially those of fluid and gas flux through the sediment-water interface have
become a new and exciting area of interest and research. Today numerous vent fields have been
discovered and described. Special benthic communities which include molluscs with bacterial
symbiotes and polychaete worms are related to fluid discharge onto the sea-floor. The main
scientific objectives have been to qualify and quantify the amount of water and gas discharge at the
sea-floor in order to estimate the role of these sources to the global biogeochemical cycle of
elements. Thus the mapping of vent fields and the description of related geological structures such
as the bottom-simulating reflector (BSR) were among the first steps of investigation. The BSR is a
acoustically detectable horizon in the sedimentary column. Above this horizon gas hydrates of
methane (and sometimes higher order hydrocarbons) and water occur in varying amounts in an ice
like condition. The depth of the BSR below the sea-floor depends on physico-chemical parameters
such as temperature and pressure, as well as the chemical composition of the fluids. The BSR
occurs widely in the area of investigation. To evaluate fully the nature and origin of vent
phenomena, thought to be related to tectonic processes in the forearc and backarc region of island
arcs, multidisciplinary research is necessary.
From September 23 to October 22, 1994 a joint expedition with scientists from the Pacific Oceanological
Institute (POI), Vladivostok/Russia, the Shirshov Institute of Oceanology, Moscow/ Russia,
the Institute for Marine Geology and Geophysics (IMG&G), Yuzhno-Sakhalinsk/Russia, the
Research Centre for Marine Geoscience (GEOMAR), Kiel/Germany and the Netherlands Institute
for Marine Research (NIOZ), Texel/The Netherlands was carried out on board the Research Vessel
Professor Bogorov during her 37th cruise. The Expedition was the principle part of the INTAS
project 93-1881 - A Joint Russian-European Expedition to Paramushir Island: Reconnaissance
Mapping of a Giant Deep Sea Vent in the Sea of Okhotsk - funded by the European Union. In
order to evaluate the scale and nature of venting, a scientific party including geophysicists,
sedimentologists, geochemists and micropalaeontologists worked closely together.

Document Type: Report (Cruise Report)
Keywords: RV Professor Bogorov ; Cruise report 37 ; POSETIV
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Publisher: GEOMAR Forschungszentrum für marine Geowissenschaften
Date Deposited: 11 Feb 2014 10:05
Last Modified: 11 Feb 2015 14:16
URI: https://oceanrep.geomar.de/id/eprint/23580

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