--> ABSTRACT: Geologic Evolution of the Late Jurassic-Recent Bogart Basin, Northeastern Gulf of Mexico: an Integrated Study of Depositional Architecture and Salt Tectonics in a Continental Slope Setting, by Cindy A. Yielding, Chris J. Travis, Dennis M. Urban, Eric J. Ekstrand; #91020 (1995).

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Geologic Evolution of the Late Jurassic-Recent Bogart Basin, Northeastern Gulf of Mexico: an Integrated Study of Depositional Architecture and Salt Tectonics in a Continental Slope Setting

Cindy A. Yielding, Chris J. Travis, Dennis M. Urban, Eric J. Ekstrand

The Bogart Basin is a salt-bounded Jurassic to Recent age depositional trough located in the continental slope in northern Mississippi Canyon and southwestern Viosca Knoll. The basin is covered by a large (800 sq. ml.) 3-D survey, which has allowed detailed interpretation of structure, sequence geometry and seismic facies. Integrated with high-resolution biostratigraphy and well log analysis, these data have allowed a confident and comprehensive evaluation of the basin's development. The observed pattern of stratal architecture, evolution of basin fill, and the linkage of salt tectonics to depositional processes have predictive value in interpreting other Gulf of Mexico slope basins.

Late Jurassic-Cretaceous age withdrawal basins separated by salt walls occur throughout the northeastern Gulf of Mexico. In latest Cretaceous-Early Miocene times, some of these salt walls in the Bogart basin area began to collapse, generating turtle geometries which were onlapped by largely hemipelagic deposits. By the mid-Miocene, a major delta had become established to the north and the basin accommodated slope depositional systems dominated by large-scale aggradational leveed channel complexes and smaller-scale erosional complexes. Little structural influence is observed during this time. The Late Miocene age stratigraphy of the area was dominated by large-scale erosional cut and fill channel complexes. At this time, renewed salt withdrawal and emplacement of allochthonous salt she ts began to affect subsidence patterns and depositional pathways. In the Pliocene, the locus of sediment input shifted westward and into the updip shelf margin and this interval is dominated, by deposition of hemipelagic sediments, salt withdrawal, widespread faulting, intermittent slumping and rapid growth of allochthonous salt.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995