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AAPG Bulletin, V.
Seismic geomorphology, lithology, and evolution of the late Pleistocene Mars-Ursa turbidite region, Mississippi Canyon area, northern Gulf of Mexico
1Department of Geosciences, Pennsylvania State University, 313 Deike Building, University Park, Pennsylvania 16802; [email protected]
2Department of Geosciences, Pennsylvania State University, 307 Deike Building, University Park, Pennsylvania 16802; [email protected]
3Shell International Exploration and Production, Bellaire Technology Center, 3737 Bellaire Blvd., Houston, Texas 77025; [email protected]
4Shell International Exploration and Production, Bellaire Technology Center, 3737 Bellaire Blvd., Houston, Texas 77025; [email protected]
The interplay between sedimentation and erosion during the late Pleistocene in the Mars-Ursa region, northern Gulf of Mexico, resulted in a complex compartmentalized reservoir. Rapid deposition, directly downdip of the Mississippi River beginning about 70 k.y., quickly filled antecedent topography in the Mars-Ursa region with a thick accumulation of sand and mud called the blue unit. This permeable reservoir was rapidly and asymmetrically buried by thick, mud-rich levees of two channel-levee systems. Both systems plunged from north to south with a steeper gradient than the underlying blue unit. Rotated channel-margin slides present in both channel-levee systems rotated low-permeability, mud-rich levee deposits beneath the sand-rich channel fill. As a result of the channel-levee systems, the east-west hydraulic connectivity of the blue unit decreases progressively from north to south until its eastern and western halves become completely separated.
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