GAS CHARGED SEDIMENTS IN THE AMAZON SUBMARINE DELTA

Authors
FIGUEIREDO AG NITTROUER CA DEALENCARCOSTA E
Citation
Ag. Figueiredo et al., GAS CHARGED SEDIMENTS IN THE AMAZON SUBMARINE DELTA, Geo-marine letters, 16(1), 1996, pp. 31-35
Citations number
17
Categorie Soggetti
Geosciences, Interdisciplinary",Oceanografhy
Journal title
Geo-marine letters
ISSN journal
02760460 → ACNP
Volume
16
Issue
1
Year of publication
1996
Pages
31 - 35
Database
ISI
SICI code
0276-0460(1996)16:1<31:GCSITA>2.0.ZU;2-5
Abstract
Seismic profiling with 3.5-kHz and GeoPulse in the Amazon submarine de lta indicates that gas-charged sediments cover an area greater than 31 ,000 km(2). Gas appears on seismic profiles as gas-brightening reflect ors near the river mouth, where mud and sand are well stratified. In f ine sediments of the distal portion of the system, gas turbidity zones predominate. Biogenic gas is generated during degradation of terrestr ial and marine organic matter by bacteria. The depth of gas in sedimen t below the seabed depends in part on anaerobic methane oxidation and the base of the sulfate reduction zone and on stratigraphic traps.