Depositional sequences in clastic continental slope deposits,Gulf of Mexico |
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| Authors: | Arnold H Bouma |
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| Institution: | (1) U.S. Geological Survey, 78411 Corpus Christi, TX;(2) Present address: Gulf Research & Development Company, P.O. Drawer 2038, 15230 Pittsburgh, PA |
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| Abstract: | Tertiary and Quaternary sediments, overlying diapiric older Tertiary shales and Louann Salt on the continental slope in the
western Gulf of Mexico, show cyclicity based on seismic-reflection patterns. A set of indistinct parallel reflections or an
acoustically semi-transparent zone, normally onlapping onto diapir flanks, alternates with a set of distinct parallel reflections
that drape the sea bottom. The indistinct reflections represent deposits employed by bottom transport during a lowering of
sea level. Sea level rise and hight stand are characterized by hemipelagic sediments that form blanket-type deposits. Differential
sediment loading causes diapiric activity that may reach maximum upward velocities when sea level rises. |
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