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Abstract
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Depositional
Cycles and Evolution of the Paleogene Wilcox Strata, Gulf of Mexico Basin,
Texas1 Liangqing Xue2 |
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ABSTRACT The Wilcox Group is one of the major thick
clastic successions of the Tertiary Gulf Coast. The Wilcox is conventionally
subdivided into lower, middle, and upper parts. Detailed correlation of
more than 700 well logs has identified two depositional cycles of the Wilcox
strata, each of which is represented by four parasequence sets or high-frequency
genetic stratigraphic sequences. Two depositional cycles bounded by maximum
flooding events were characterized by depocenter shifting, shelf-margin
progradation, and depositional system evolution, and lasted several million
years. The sedimentary record of two depositional cycles documents two
aspects of these cycles. One aspect is that the shelf margin alternated
between periods of active outbuilding and periods of relative stability
or minor retrogradation. Another aspect of the cycle is that depositional
system evolution displays a progression from progradation to aggradation
to retrogressive transgression. The time spans of these two cycles are
3.6 m.y. and 7.5 m.y., respectively, based on the Haq time scale. Each
of the two depositional cycles generally corresponds to a pulse of Laramide
tectonism. Deposition of two cycles may also reflect a eustatic sea level
overprint. |
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