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- W2019205320 abstract "Pleistocene sediments were cored at nine middle and lower Mississippi fan sites, in water depths from 2,500 to 3,300 m (8,200 to 10,825 ft). Radiography, thin-section, SEM, and XRD studies provided data from which the fan's major depositional environments can be described. 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 of varying thickness is the dominant sedimentary structure 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 abundant in silts and clays. Smectite, illite, dolomite, calcite, pyrite, and gypsum are the main authigenic phases. At this stage in their depositional history, the sands are clean, have high porosities and permeabilities, show only minor pore-reducing diagenetic effects, and thus have excellent hydrocarbon reservoir potential. End_of_Article - Last_Page 1430------------" @default.
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- W2019205320 modified "2023-09-28" @default.
- W2019205320 title "Petrology and Sedimentology of Mississippi Fan Cores, DSDP Leg 96: ABSTRACT" @default.
- W2019205320 doi "https://doi.org/10.1306/948852c3-1704-11d7-8645000102c1865d" @default.
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