Acoustic evidences of gas in the continental slope sediments of the Gulf of Cadiz (E Atlantic)
| Autor: | David Casas, Jesús Baraza, Gemma Ercilla |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
geography
geography.geographical_feature_category Continental shelf Clathrate hydrate Geochemistry Environmental Science (miscellaneous) Diapir Geotechnical Engineering and Engineering Geology Oceanography Pore water pressure Water column Volcano Earth and Planetary Sciences (miscellaneous) Turbidity Geomorphology Geology |
| Zdroj: | Geo-Marine Letters. 23:300-310 |
| ISSN: | 1432-1157 0276-0460 |
| DOI: | 10.1007/s00367-003-0160-z |
| Popis: | Detailed reviews of high-resolution acoustic studies in the continental slope of the Gulf of Cadiz has revealed the following gas-related features: acoustic turbidity and blanking, bright spots, ancient and modern pockmarks, high-amplitude diffractions, acoustic plumes and turbidity in the water column, and BSRs. The origin of the gas is believed to be biogenic and thermogenic. The BSR-like acoustic anomalies occur intermittently in some areas of the upper slope and tend to occur in the volcanoes/diapirs. The pressure–temperature conditions deduced for the location of those acoustic anomalies do not correspond to the conditions of stability of gas hydrates. It is suggested that these volcanoes/diapirs intrusions may locally induce anomalously higher pore pressure conditions on the immediately surrounding sediments, affecting the stability field of the gas hydrates. |
| Databáze: | OpenAIRE |
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