Abstracts

• 844 A Brief Tectonic and Depositional History of the Northern Gulf of Mexico The Gulf of Mexico (GOM) is the 9th largest body of water on earth, covering an area of approximately 1.6 million km2 with water depths reaching 4,400 m (14,300’). The basin formed as a result of crustal extension during the early Mesozoic breakup of Pangaea. Rifting occurred from the Late Triassic to early Middle Jurassic. Continued extension through the Middle Jurassic combined with counter-clockwise rotation of crustal blocks away from North America produced highly extended continental crust in the subsiding basin center. Subsidence eventually allowed oceanic water to enter from the west leading to thick, widespread, evaporite deposition. Seafloor spreading initiated in the Late Jurassic eventually splitting the evaporite deposits into northern (USA) and southern (Mexican) basins. Recent work suggests that this may have been accomplished by asymmetric extension, crustal delamination, and exposure of the lower crust or upper mantle rather than true sea floor spreading (or it could be some combination of the two). A Brief Tectonic and Depositional History of the Northern Gulf of Mexico
  A Brief Tectonic and Depositional History of the Northern Gulf of Mexico
• 846 Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico Seismic correlations and well data confirm that deep-water carbonate beds of Mesozoic age have been found above the shallow allochthonous salt canopy in the northern Gulf of Mexico. These rafts of carbonate strata often overlie equivalent age Mesozoic carbonates in their correct stratigraphic position below the salt canopy. The origin of keel structures is presently not well understood. As deformation occurs after shallow canopy emplacement, the keels are fairly recent developments geologically. Volumetrically few but intriguing observations suggest possible basement involvement in keel formation. Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico
  Mesozoic Carbonate Rafts Above and Keel Structures at the Base of Shallow Salt Canopies: Exotic Processes at work in the Deep-water Northern Gulf of Mexico