Late Quaternary Shelf-Margin Delta and Slope-Fan Complexes of the East Texas–Western Louisiana Margin: Variable Response to Eustasy and Sediment Supply
Published:December 01, 2013
John B. Anderson, Julia Wellner, Ken Abdulah, Sabrina Sarzalejo, 2013. "Late Quaternary Shelf-Margin Delta and Slope-Fan Complexes of the East Texas–Western Louisiana Margin: Variable Response to Eustasy and Sediment Supply", Shelf Margin Deltas and Linked Down Slope Petroleum Systems–Global Significance and Future Exploration Potential, Harry H. Roberts, Norman C. Rosen, Richard H. Fillon, John B. Anderson
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During the previous glacial-eustatic fall, the ancestral Brazos and western Louisiana rivers, which flowed across low gradient coastal plains and shelves, constructed large fluvial-dominated deltas that extend to the shelf margin. These rivers shifted to new locations prior to the lowstand, resulting in shelf-margin deltas that have no associated down-dip lowstand deltas or fans. The Trinity and Colorado rivers remained fixed in their locations throughout the eustatic fall and lowstand, resulting in linked valley/delta/fan complexes. Re-incision of lowstand valleys by these rivers over several eustatic cycles resulted in significant sediment bypass to the slope.
Factors that influenced the response of rivers to falling sea level include long-term sediment supply, diapiric controls on channel location, and the physiography of the shelf over which the rivers flowed.