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Seabed fluid expulsion along the upper slope and outer shelf of the U.S. Atlantic continental margin

Geophysical Research Letters

By:
, , , , , , ,
DOI: 10.1002/2013GL058048

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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.

Geospatial Extents

Additional Publication Details

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
First page:
96
Last page:
101
Number of Pages:
6
Country:
United States
Other Geospatial:
Atlantic Margin