Diachronous Development of Late Quaternary Shelf-Margin Deltas in the Northwestern Gulf of Mexico: Implications for Sequence Stratigraphy and Deep-Water Reservoir Occurrence
John B. Anderson, 2005. "Diachronous Development of Late Quaternary Shelf-Margin Deltas in the Northwestern Gulf of Mexico: Implications for Sequence Stratigraphy and Deep-Water Reservoir Occurrence", River Deltas–Concepts, Models, and Examples, Liviu Giosan, Janok P. Bhattacharya
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For the most part, delta development across the northern Gulf of Mexico shelf during the last glacioeustatic cycle occurred throughout the falling limb of sea level. The deltas have different morphologies, sediment facies patterns, and stratigraphic architectures. Depending on the sediment supply of their fluvial feeders, these deltas reached the shelf margin at different times. The Rio Grande, Colorado, Trinity, and Sabine rivers remained fixed in their locations on the shelf throughout the late stages of sea-level fall and into the lowstand. Hence, they all formed lowstand deltas and all nourished slope fans. In contrast, the Brazos and western Louisiana rivers abandoned their shelf-margin deltas prior to the lowstand. Hence, neither the Brazos nor the western Louisiana fluvial systems have linked lowstand delta and slope fans. Because growth of the different shelf-margin deltas spans different portions of the sea-level cycle, the location of the sequence boundary and associated correlative conformity relative to the shelf-margin stratigraphic package varies from one deltaic system to the next.