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Pleistocene sediments were cored at nine middle and lower Mississippi Fan sites, in water depths from 2500 to 3300 m. Radiography, thin section, scanning electron microscope, and X-ray diffraction studies provide data to describe the fan's major depositional environments. Sands and minor gravels are concentrated in middle and lower fan channel fills, and in lower fan channel-mouth deposits. Silts and clays occur in overbank deposits, passive channel fills, and interbeds associated with coarser facies. Graded bedding and lamination, both of varying thickness, are the dominant sedimentary structures in all environments. Granule and pebble gravels are composed of well-rounded chert and polycrystalline quartz, with minor metamorphic and igneous rock fragments. Moderately to well sorted sands are mainly fine and very fine feldspathic litharenite, sublitharenite, and subarkose. Sands commonly have thin-section porosities between 20 and 35%; woody organic contents range from 0.7 to 7.9% total organic carbon. Authigenic minerals occur in sands and muds, but are most common in fine-grained silts and clays. Smectite, dolomite, calcite, pyrite, and gypsum are the main authigenic phases. At this stage in their depositional history, the sands are relatively clean, have high porosities, show only minor porereducing diagenetic effects, and thus have excellent hydrocarbon reservoir potential.

Sedimentology and Petrology of Mississippi Fan Depositional Environments, Deep Sea Drilling Project Leg 96