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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Sequence Stratigraphy
of Miocene to Pleistocene Sediments of East-Central Mississippi Canyon,
Northern Gulf of Mexico
Roesink, John G.,1 Weimer,
Paul,1 and Bouroullec, Renaud2
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.
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