| Autor: |
D. S. Brothers, C. Ruppel, J. W. Kluesner, U. S. ten Brink, J. D. Chaytor, J. C. Hill, B. D. Andrews, C. Flores |
| Rok vydání: |
2014 |
| Předmět: |
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| Zdroj: |
Geophysical Research Letters. 41:96-101 |
| ISSN: |
0094-8276 |
| DOI: |
10.1002/2013gl058048 |
| Popis: |
[1] 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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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