Gas hydrates in shallow deposits of the Amsterdam mud volcano, Anaximander Mountains, Northeastern Mediterranean Sea

We investigated gas hydrate in situ inventories as well as the composition and principal transport mechanisms of fluids expelled at the Amsterdam mud volcano (AMV; 2,025 m water depth) in the Eastern Mediterranean Sea. Pressure coring (the only technique preventing hydrates from decomposition during...

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Bibliographic Details
Published in:Geo-marine letters 2010-06, Vol.30 (3-4), p.187-206
Main Authors: Pape, Thomas, Kasten, Sabine, Zabel, Matthias, Bahr, André, Abegg, Friedrich, Hohnberg, Hans-Jürgen, Bohrmann, Gerhard
Format: Article
Language:English
Subjects:
Cores
Crystallization
Earth and Environmental Science
Earth Sciences
Ethane
Gas hydrates
Geology
Hydrates
Hydrocarbons
Hydrostatic pressure
Marine sediments
Methane
Mountains
Mud
Ocean floor
Original
Salinity
Sulfate reduction
Sulfates
Volcanoes
Water chemistry
Water depth
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Summary:We investigated gas hydrate in situ inventories as well as the composition and principal transport mechanisms of fluids expelled at the Amsterdam mud volcano (AMV; 2,025 m water depth) in the Eastern Mediterranean Sea. Pressure coring (the only technique preventing hydrates from decomposition during recovery) was used for the quantification of light hydrocarbons in near-surface deposits. The cores (up to 2.5 m in length) were retrieved with an autoclave piston corer, and served for analyses of gas quantities and compositions, and pore-water chemistry. For comparison, gravity cores from sites at the summit and beyond the AMV were analyzed. A prevalence of thermogenic light hydrocarbons was inferred from average C 1 /C 2+ ratios
ISSN:0276-0460
1432-1157
DOI:10.1007/s00367-010-0197-8