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GAS SEEPS IN THE NORTH WESTERN PART OF THE BLACK SEA PRELIMINARY RESULTS
Abstract
The NW part of the Black Sea is under the strong influence of the Danube River that discharges into the basin. Danube, through the input of sediment and water, has a double function in controlling the gas presence in NW Black Sea shallow sediments. The first function is to deliver into the sea the terrestrial organic matter that it is added to the marine in origin one. The second function is to provide a sustained sedimentation rate, needed to bury older organic matter, conducting to biogenic generation of methane in shallow sediments. Some previous works showed that in this part of the sea there are also thermogenic pools of methane (some of them exploitable) that could be microbiologically reprocessed and reach the shallow part of the sediment pile, mainly via tectonics or some preferential pathways. The gas seeps are important features for the marine habitat but also in case of submarine infrastructure works, when they could be seen as natural hazards. The most effective technique in mapping and characterizing submarine gas seeps is by using the multibeam echosounder – water column recording. We conducted several sea campaigns of multibeam echosounding – MBES, employing a NORBIT iWMBSh equipment and we have been able to map and classify the gas seeps. The method produces a huge amount of data that usually is replayed offline, searching for specific acoustic facies that indicates when gas streams are present in the water column. We mapped on the sea bottom the x, y and z coordinates of each seep location. According with the acoustic facies of the gas stream in the water column, the detected seeps have been also classified function of their intensity.
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References1
Novikova et al. (2015) - A metane-derived carbonate build-up at a cold seep on the Crimean slope, north-western Black Sea;
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