Title: EXTENDED ABSTRACT: Sequence Stratigraphy of Miocene to Pleistocene Sediments of East-Central Mississippi Canyon, Northern Gulf of Mexico
Abstract: This study documents the sequence stratigraphic evolution of east-central Mississippi Can-yon and northern Atwater Valley protraction areas, northern Gulf of Mexico, through the integration of 2-D multifold seismic, well log, and biostratigraphic data. Turbidite systems, sourced from the Mississippi Delta System, were deposited on allochthonous salt creating a series of intraslope basins. These mini-basins are the depositional centers of the study area. Neogene turbidite successions are the major deposits throughout the study area. The main depositional elements that characterize the depositional setting are amalgamated and layered sheet sands, channel-fill deposits, overbank deposits, mass failure deposits (slides), and condensed sections. Eight intervals described in detail are named by their bounding surfaces: 24.7-15.3 Ma, 15.3-13.05 Ma, 13.05-10.75 Ma, 10.75-9.0 Ma, 9.0-7.45 Ma, 7.45-6.2 Ma, 6.2-5.4 Ma, 5.4-4.1 Ma. The Top Cretaceous (TCSB-66 Ma), 3.6 and 1.3 Ma sequence boundaries were also correlated. These intervals were deposited in bathyal water depths and largely correspond to lowstand systems tract deposition. Individual sequence geometry and thickness was largely controlled by salt evacuation rates and large-scale sedimentation patterns. Amalgamated and layered sheet sands, which create basin floor fan successions, predominantly occur at the base of sequences and in areas of rapid salt withdrawal. Basin floor fan deposition is more common in older sequences. Stacked channel-overbank deposits are the most common depositional succession of each sequence, with overbank deposits accounting for most of the sediment fill in the study area.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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