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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Sequence Stratigraphy
and Evolution of an Upper Pleistocene Mississippi Fan Channel (0.7-0.6
Ma), Northern Deep Gulf of Mexico
Morton, Christopher H.1,2 and Weimer,
Paul1
ABSTRACT
The Mississippi Fan channel # 10 (ca. 0.7-0.6 Ma) is located
in the western Atwater Valley protraction area. Interpretation of a 5.5 mile
by 11.5 mile 3-D data cube indicates that channel 10 comprises three main
architectural elements: channel-fill, levees, and slides.
Channel-fill sediments are characterized by
high amplitude, sub-parallel reflections, commonly one to three reflections
in occurrence. Eleven discrete channels could be traced through the data
set. Levees are characterized by lower amplitudes and are parallel to subparallel
with an external wedge shape near the flanks of the channel that taper away
from the channel. There are several surfaces and subfacies (truncation surfaces,
isolated high amplitudes, slides, and reflection free or extremely deformed
zones) within the levee-overbank that reflect the complex sedimentary processes
within the levee. Slides are characterized by a variety of seismic facies
and are distributed in many positions throughout the sequence. Externally
they are rotated, faulted, folded, and thrusted sediments. Three types of
slides are present within sequence 10; slides from levees into channels,
slides within the levees away from the channels, and slides that deform portions
of the entire levee. Interpretation of the 3-D data set indicates complex
juxtaposition and evolution of these facies.
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