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Can I read Pockmarks in the Northern Congo Fan area, SW Africa: Complex seafloor features shaped by fluid flow on EtoBox?
Pockmarks in the Northern Congo Fan area, SW Africa: Complex seafloor features shaped by fluid flow by Heiko Sahling; Gerhard Bohrmann; Volkhard Spiess; Jörg Bialas; Monika Breitzke; Michael Ivanov; Sabine Kasten; Sebastian Krastel; Ralph Schneider is a Earth and Planetary Sciences article available to read on EtoBox.
What is Pockmarks in the Northern Congo Fan area, SW Africa: Complex seafloor features shaped by fluid flow about?
Three pockmarks named "Hydrate Hole", "Black Hole", and "Worm Hole" were studied in the northern Congo Fan area at water depths around 3100 m. The cross-disciplinary investigations include seafloor observations by TV-sled, sampling by TV-guided grab and multicorer as well as gravity coring, in addition to hydroacoustic mapping by a swath system, a parametric sediment echosounder and a deep-towed sidescan sonar. The pockmarks are morphologically complex features consisting of one or more up to 1000 m wide and 10-15 m deep depressions revealed by swath-mapping. High reflection amplitudes in the sediment echosounder records indicate the presence of a 25-30 m thick shallow sediment section with gas hydrates, which have been recovered by gravity corer. Hydrates, chemosynthetic communities, and authigenic carbonates clearly indicate fluid flow from depths, which we propose to be mainly in the form of ascending gas bubbles rather than advection of methane-rich porewater. Evidence for seepage at the seafloor is confined to small areas within the seafloor depressions and was revealed by characteristic backscatter facies. Small meter-scale sized depressions signified as "pits" exist in or cl
Who reads Pockmarks in the Northern Congo Fan area, SW Africa: Complex seafloor features shaped by fluid flow?
It is typically read by researchers, students, and practitioners in Earth and Planetary Sciences.
- Author
- Heiko Sahling; Gerhard Bohrmann; Volkhard Spiess; Jörg Bialas; Monika Breitzke; Michael Ivanov; Sabine Kasten; Sebastian Krastel; Ralph Schneider
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0025-3227)
- Published
- 2008
- Language
- EN
- Field
- Earth and Planetary Sciences (Physical Sciences)