Gas-charged sediments in the Amazon submarine delta |
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| Authors: | Alberto G Figueiredo Jr Charles A Nittrouer Elen de Alencar Costa |
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| Institution: | (1) Depto. de Geologia, Lagemar, Universidade Federal Fluminense, Av. Litoranea, s/n, 24030-340 Gragoata, Niteroi, R.J., Brasil;(2) Marine Sciences Research Center, State University of New York, 11794-5000 Stony Brook, New York, USA |
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| Abstract: | Seismic profiling with 3.5-kHz and GeoPulse in the Amazon submarine delta indicates that gas-charged sediments cover an area greater than 31,000 km2. Gas appears on seismic profiles as gas-brightening reflectors near the river mouth, where mud and sand are well stratified. In fine sediments of the distal portion of the system, gas turbidity zones predominate. Biogenic gas is generated during degradation of terrestrial and marine organic matter by bacteria. The depth of gas in sediment below the seabed depends in part on anaerobic methane oxidation and the base of the sulfate reduction zone and on stratigraphic traps. |
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