Pagoda Structures in Marine Sediments
Geophysical traverses across flat or nearly flat mud bottom at depths between 2000 and 5500 meters off western Africa permitted the making of extensive shallow-penetration recordings at 3.5 kHz. The recordings reveal the common presence of alternating dark and light triangular features whose internal structure and acoustic properties may be due to local centers of cementation by gas hydrates, or clathrates. Probably the features are widely distributed in the fine-grained sediments of continental rises and abyssal plains of the world ocean, but are not detected by the usual echo sounding at 12 kHz or seismic reflection profiling at 20 to 100 Hz.
KeywordsClay Permeability Methane Dioxide Hydrate
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