... Abstract Infiltration of shallow soils by naturally occurring hydrocarbons has been documented in several deepwater environments worldwide. The potential for significant soil modification, such as the development of authigenic carbonates and alteration of the generally expected background...

... 818, AC 601, GC 852 and AT 340 had impressive and diverse chemosynthetic communities as well as well-defined fluid-gas expulsion geology. In addition to chemosynthetic communities, GC 852 had abundant hard and soft corals seated on substrates of authigenic carbonate boulders. At AC 601 (WD ~ 2340 m...

... inspection) have the most potential for supporting high-density chemosynthetic communities. Based on the calibration results, inferred hydrocarbon seepage sites that exceed a specific seafloor backscatter intensity level, and contain anomalous seafloor mounds interpreted as authigenic carbonate...

..., and subbottom profiler data from an Autonomous Underwater Vehicle (AUV), an untethered high-resolution seafloor and foundation zone survey platform, are used. authigenic carbonate gradient sulfide reservoir characterization structural geology gulf assessment backscatter mottl pore water...

... through the shallow strata has resulted in the formation of extensive areas of authigenic carbonate at, and immediately below, the seabed interface. Active hydrocarbon seepage continues to feed chemosynthetic fauna across much of the Puma area. However, population densities are sparser than might...

... authigenic carbonate structural geology seafloor hydrate mud volcano flux expulsion Copyright 2002, Offshore Technology Conference This paper was prepared for presentation at the 2002 Offshore Technology Conference held in Houston, Texas U.S.A., 6 9 May 2002. This paper was selected for presentation...

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..., methane oxidation, oil degradation, and authigenic carbonate precipitation have significantly effected the geology, geochemistry, and morphology of the continental slope of the northern Gulf of Mexico. Regional topography is largely controlled by salt diapirism and slumping, and is characterized by pock...

... authigenic carbonate shallow salt diapir structural geology hydrocarbon salt diapir louisiana continental slope carbonate buildup carbonate buildup carbonate mound seafloor diapir continental slope seismic profile diapir crest seafloor feature submersible observation upstream...