. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 18 Clay Fabric and Geotechnical Properties of Sediment Cores Geologic Setting and Sampling This study of clay fabric and geotechnical properties of submarine sediment is confined to a selected area of the Mississippi Birdfoot prodelta depositional environment (fig. 24). The sediment cores investigated were recovered from water depths ranging from 67 to 73 m with a lateral sepa- ration of approximately 610 m. The cores are referred to as B—1, B—2, an
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 18 Clay Fabric and Geotechnical Properties of Sediment Cores Geologic Setting and Sampling This study of clay fabric and geotechnical properties of submarine sediment is confined to a selected area of the Mississippi Birdfoot prodelta depositional environment (fig. 24). The sediment cores investigated were recovered from water depths ranging from 67 to 73 m with a lateral sepa- ration of approximately 610 m. The cores are referred to as B—1, B—2, and B-3 in this study. Detailed analyses were restricted to cores B-1 and B—2; core B—3 was used for supplemental mass physical properties data. The Birdfoot Delta is the most modern depositional area of the Mississippi Delta complex. Sediments are prograding seaward deposit- ing clays and silty clays in the prodelta environment. General Geology Sediments of the Mississippi Delta, particularly the pro- delta and adjacent shelf area sediments, are dominantly clay. The Mississippi River discharges approximately X 10" kg of sediment annually into the Gulf of Mexico with a contribution of about 30% sand, 30% silt, and 40% clay size material (Coleman and Wright 1974). Sand that reaches the Mississippi Birdfoot Delta consists of fine to very fine material which is deposited largely on the dis- tributary-mouth bars. Silts and clays are deposited largely in the prodelta and deeper Gulf floor environments. The Mis- 30' 20' 29*» 10* 29** 00' 28« 50'. 89*»30' 89*»20' 89*»I0' 89*»00' 88*»50' Figure 24.—General study area—Mississippi Birdfoot Delta. (From Shepard 1956). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atlantic Oceanographic and Meteorological Laboratories; Pacific Oceanographic
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