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Sediments in this area are representative of two types of depositional processes, a slow and continuous particle-by-particle accumulation as shown by pelagic red clays, and a more rapid turbidity type deposition as indicated by graded silt layers. An increase in quantity of these interbedded layers to the south indicates both an apparent source for these materials as well as an increase in deposition rate in the direction. Distribution of these silt layers is primarily influenced by the northwest trending seaknolls in the southern portion of the area. Shear strength values show an increase to the north. This increase coincides with an increase in the moisture content, carbonate content, and clay-size fraction. The cause for this relationship is attributed to the lower rate of sediment accumulation which provides the necessary time required for the clays to consolidate. The slightest increase in carbonate content suggests that a portion of this increased strength may be the result of authigenic cementation. (Author).
A preliminary investigation of the surficial sediments at the SEALAB III Test Site shows the textural, compositional, and engineering properties to be uniform in both makeup and distribution. Sands and silty sands are the dominant textural grade. Mean diameters range from 0.09 to 0.25 mm. Carbonate content ranges from 55 to 78 percent. The carbonate in the form of biogenic calcite. Detrital silicates (feldspars, quartz, illite, and chlorite) and minor amounts of organic matter are the remaining constituents present. Wet unit weights and water contents (percent dry weight) on individual samples range from 1.56 to 1.71 g/cucm and from 45 to 77 percent, respectively. Direct shear tests were performed on a prepared sediment sample to determine the range of angles of internal friction. (Author).