Table of Contents
Journal of Geological Research
Volume 2011, Article ID 247983, 11 pages
http://dx.doi.org/10.1155/2011/247983
Research Article

Thessaloniki Mud Volcano, the Shallowest Gas Hydrate-Bearing Mud Volcano in the Anaximander Mountains, Eastern Mediterranean

1Institute of Geology and Mineral Exploration, Entrance C, Spyrou Louis 1, Olympic Village, Acharne, 13677 Athens, Greece
2Hellenic Centre for Marine Research, 46th km Athens-Sounion BP712, 19013 Anavyssos, Greece
3Department of Sedimentary and Marine Geology, Vrije Universiteit Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands
4Department of Geochemistry, Faculty of Earth Sciences, Utrecht University, 80021 Budapestla-an 4, 3508 TA Utrecht, The Netherlands
5Institut de Sciences del Mar, Paseo Maritimo de la Barceloneta 37-49, 08003 Barcelona, Spain
6Bundesanstalt für Geowissenschaften und Rohstoffe Geozentrum Hannover, Stilleweg 2, D-30655 Hannover, Germany
7Technische Universität Berlin, Mullerv Bresslau Strasse, 10623 Berlin, Germany

Received 2 June 2011; Revised 16 August 2011; Accepted 12 September 2011

Academic Editor: Michela Giustiniani

Copyright © 2011 C. Perissoratis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A detailed multibeam survey and the subsequent gravity coring carried out in the Anaximander Mountains, Eastern Mediterranean, detected a new active gas hydrate-bearing mud volcano (MV) that was named Thessaloniki. It is outlined by the 1315 m bathymetric contour, is 1.67 km2 in area, and has a summit depth of 1260 m. The sea bottom water temperature is 13.7C. The gas hydrate crystals generally have the form of flakes or rice, some larger aggregates of them are up to 2 cm across. A pressure core taken at the site contained 3.1 lt. of hydrocarbon gases composed of methane, nearly devoid of propane and butane. The sediment had a gas hydrate occupancy of 0.7% of the core volume. These characteristics place the gas hydrate field at Thessaloniki MV at the upper boundary of the gas hydrate stability zone, prone to dissociation with the slightest increase in sea water temperature, decrease in hydrostatic pressure, or change in the temperature of the advecting fluids.