Margin Tectonics of Northern Gulf of Mexico Coastal Plain, Shelf, and Slope Proposed to Impact Basement and Mantle
Principal constant force input is gravity. Downslope motion causes earthquakes (brittle fracture) and slow/silent earthquakes (plastic deformation). Earthquakes generate instantaneous energy that accelerates ongoing geologic processes. Slow/silent earthquakes move sediment volumes, reorienting mass location and further movements/dynamics. Instantaneous pressure waves from meteor impacts and great earthquakes act as margin-wide energy inputs. Catastrophic glacial lake collapse deposition creates events that last less than a year and deposition rate changes of 3 to 4-5 orders of magnitude. These low-frequency, pressure-generating events create pressure waves. Margin evolutionary processes generate energies that drive tectonic growth.
Within margin progradation, there is aggradation and progradation with sea-level oscillation. The maximum deposition loci oscillates across the margin, changing compression onto the basement. Following isostacy basement depression, given the changing sedimentary cover, thicknesses could vary 60-90% of sediment cover. With successive sediment accumulation, the basement continues to be depressed. These basement-depth-related changes vary basement impact onto overlying sediments with heat, geothermal and geochemical fluids.