The thermal structure of the Dvurechenskii mud volcano and its implications for gas hydrate stability and eruption dynamics

Feseker, Tomas, Pape, T., Wallmann, Klaus, Klapp, S. A., Schmidt-Schierhorn, F. and Bohrmann, Gerhard (2009) The thermal structure of the Dvurechenskii mud volcano and its implications for gas hydrate stability and eruption dynamics Marine and Petroleum Geology, 26 . pp. 1812-1823. DOI 10.1016/j.marpetgeo.2009.01.021.

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Abstract

The sediment temperature distribution at mud volcanoes provides insights into their activity and into the occurrence of gas hydrates. If ambient pressure and temperature conditions are close to the limits of the gas hydrate stability field, the sediment temperature distribution not only limits the occurrence of gas hydrates, but is itself influenced by heat production and consumption related to the formation and dissociation of gas hydrates. Located in the Sorokin Trough in the northern Black Sea, the Dvurechenskii mud volcano (DMV) was in the focus of detailed investigations during the M72/2 and M73/3a cruises of the German R/V Meteor and the ROV Quest 4000 m in February and March 2007. A large number of in-situ sediment temperature measurements were conducted from the ROV and with a sensor-equipped gravity corer. Gas hydrates were sampled in pressurized cores using a dynamic autoclave piston corer (DAPC). The thermal structure of the DMV suggests a regime of fluid flow at rates decreasing from the summit towards the edges of the mud volcano, accompanied by intermittent mud expulsion at the summit. Modeled gas hydrate dissociation temperatures reveal that the gas hydrates at the DMV are very close to the stability limits. Changes in heat flow due to variable seepage rates probably do not result in changes in sediment temperature but are compensated by gas hydrate dissociation and formation. (C) 2009 Elsevier Ltd. All rights reserved.

Document Type: Article
Keywords: Black Sea; Mud volcano; Temperature measurements; Gas hydrates
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1016/j.marpetgeo.2009.01.021
ISSN: 0264-8172
Projects: Future Ocean, GEOTECHNOLOGIEN
Expeditions/Models:
Date Deposited: 07 Jan 2010 09:08
Last Modified: 21 Jul 2017 12:59
URI: http://eprints.uni-kiel.de/id/eprint/2204

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