Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin
Geophysical Research Letters
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Abstract
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.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin |
| Series title | Geophysical Research Letters |
| DOI | 10.1002/2013GL058048 |
| Volume | 41 |
| Issue | 1 |
| Year Published | 2014 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Woods Hole Coastal and Marine Science Center |
| Description | 6 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| First page | 96 |
| Last page | 101 |
| Country | United States |
| Other Geospatial | Atlantic Margin |
| Google Analytic Metrics | Metrics page |