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Bottom processes, morphology, and geotechnical properties of the continental slope south of Baltimore Canyon |
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| Authors: | Bonnie A McGregor Richard H Bennett Douglas N Lambert |
| Institution: | Atlantic Oceanographic and Meteorological Laboratories, National Oceanic and Atmospheric Administration, 15 Rickenbacker Causeway, Miami, Florida 33149, USA |
| Abstract: | The continental slope south of Baltimore Canyon seaward of the coasts of Delaware and Maryland has a different morphology and sedimentary structure than adjacent portions of the continental margin. Ridges of sediment 600 m thick and transverse to the slope contain many unconformities that can be traced from ridge to ridge. The age of the sediment is inferred to be late tertiary to recent with the morphology related to a major drainage system. Physical properties of a suite of sediment cores display a pattern that varies in relationship to the morphology and depositional environment. Sedimentary structures and low shear strengths indicate instability of surficial sediments present on the upper slope and can be correlated with regions where the seismic reflection profiles show slumping has occurred. A veneer of sand overlying the general silty clay of the area is present on the upper slope and on the ridges indicating sand spillover from the shelf with a recent change in deposition pattern. |
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