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Fluid Seepage in Relation to Seabed Deformation on the Central Nile Deep-Sea Fan, Part 1: Evidence from Sidescan Sonar Data
UNS UPMC CNRS OCA, France.
OGS Ist Nazl Oceanog Geofis Sperimentale, Italy.
UNS UPMC CNRS OCA, France.
IFREMER, France.
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2014 (English)In: Submarine Mass Movements and their Consequences: 6th International Symposium / [ed] Krastel, S Behrmann, JH Völker, D Stipp, M Berndt, C Urgeles, R Chaytor, J Huhn, K Strasser, M Harbitz, CB, Springer, 2014, p. 129-139Conference paper, Published paper (Refereed)
Abstract [en]

The central Nile Deep-Sea Fan contains a broad area of seabed destabilisation in association with fluid seepage: slope-parallel sediment undulations are associated with multibeam high-backscatter patches (HBPs) related to authigenic carbonates. During the 2011 APINIL campaign, a deep-towed sidescan and profiling system (SAR) was used to acquire high-resolution data along three transects across water depths of 1,700-2,650 m. Three seabed domains are distinguished, all developed within stratified sediments overlying mass-transport deposits (MTDs). Upslope of the undulations (<1,950 m), sidescan HBPs record focused fluid seepage via seabed cracks. In the western area of undulations, sidescan HBPs are distinct from intermediate-backscatter patches (IBPs) that extend up to 850 m parallel to the undulations, mainly along their downslope flanks; some contain sub-circular HBPs up to 300 m wide, three associated with smaller (<10 m) hydroacoustic gas flares. Focused fluid seeps are inferred to have shifted over time to form elongate carbonate pavements, preferentially along the footwalls of faults beneath the undulations that provide pathways for fluid flow. In contrast, in the eastern area of undulations, sidescan imagery reveal only slope-transverse furrows formed by turbulent flows, interpreted to indicate that fossil carbonates sampled during submersible operations have been exhumed by erosion.

Place, publisher, year, edition, pages
Springer, 2014. p. 129-139
Series
Advances in Natural and Technological Hazards Research ; 37
Keywords [en]
Fluid seepage, Sediment deformation, Backscatter, Gas flares
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-75667DOI: 10.1007/978-3-319-00972-8_12ISI: 000339716900012ISBN: 978-3-319-00972-8 (print)ISBN: 978-3-319-00971-1 (print)OAI: oai:DiVA.org:lnu-75667DiVA, id: diva2:1216994
Conference
6th International Symposium on Submarine Mass Movements and Their Consequences,Kiel, GERMANY, SEP, 2013
Available from: 2018-06-12 Created: 2018-06-12 Last updated: 2019-02-22Bibliographically approved

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Ketzer, João Marcelo

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