Acoustic evidences of gas in the continental slope sediments of the Gulf of Cadiz (E Atlantic)

被引：33

作者：

Casas, D ^{[1
]}

Ercilla, G ^{[1
]}

Baraza, J ^{[1
]}

机构：

[1] CSIC, Inst Ciencias Mar, E-08003 Barcelona, Spain

来源：

GEO-MARINE LETTERS | 2003年 / 23卷 / 3-4期

关键词：

D O I：

10.1007/s00367-003-0160-z

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

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.

引用

页码：300 / 310

页数：11

共 51 条

[1] SEISMIC STUDIES OF A BOTTOM SIMULATING REFLECTION RELATED TO GAS HYDRATE BENEATH THE CONTINENTAL-MARGIN OF THE BEAUFORT SEA [J].