Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin
Brothers, Daniel S.
Ruppel, Carolyn D.
Kluesner, J. W.
ten Brink, Uri S.
Chaytor, Jason D.
Hill, Jenna C.
Andrews, Brian D.
Flores, Claudia H.
MetadataShow full item record
KeywordSeismic stratigraphy; Pockmark; Gas hydrate; Fluid expulsion; Submarine landslide; Attribute analysis
Identifying the spatial distribution of seabed fluid expulsion features is crucial for understanding the substrate plumbing system of any continental margin. A 1100 km stretch of the U.S. Atlantic margin contains more than 5000 pockmarks at water depths of 120 m (shelf edge) to 700 m (upper slope), mostly updip of the contemporary gas hydrate stability zone (GHSZ). Advanced attribute analyses of high-resolution multichannel seismic reflection data reveal gas-charged sediment and probable fluid chimneys beneath pockmark fields. A series of enhanced reflectors, inferred to represent hydrate-bearing sediments, occur within the GHSZ. Differential sediment loading at the shelf edge and warming-induced gas hydrate dissociation along the upper slope are the proposed mechanisms that led to transient changes in substrate pore fluid overpressure, vertical fluid/gas migration, and pockmark formation.
Author Posting. © American Geophysical Union, 2014. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 41 (2014): 96-101, doi:10.1002/2013GL058048.
Showing items related by title, author, creator and subject.
Geophysical fluid dynamics : notes on the 1960 Summer Study Program in Geophysical Fluid Dynamics at the Woods Hole Oceanographic Institution Spiegel, E. A. (Woods Hole Oceanographic Institution, 1960)
Fluid-induced breakdown of white mica controls nitrogen transfer during fluid–rock interaction in subduction zones Halama, Ralf; Bebout, Gray; Marschall, Horst R.; John, Timm (2016-09)In order to determine the effects of fluid–rock interaction on nitrogen elemental and isotopic systematics in high-pressure metamorphic rocks, we investigated three different profiles representing three distinct scenarios ...
Salmon, Rick; DeRemer, Barbara Ewing (Woods Hole Oceanographic Institution, 1990-10)The 1990 program in Geophysical Fluid Dynamics had as its special topic "Stellar Fluid Dynamics". Introductory lectures by Edward Spiegel and Jean-Paul Zahn paved the way for more specialized seminars on solar oscillations, ...