Late Quaternary Shelf-Edge Deltas from Northeastern Gulf of Mexico and Eastern Borneo (Indonesia): A Comparison
H.H. Roberts, J. Sydow, R.H. Fillon, B. Kohl, 2013. "Late Quaternary Shelf-Edge Deltas from Northeastern Gulf of Mexico and Eastern Borneo (Indonesia): A Comparison", 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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As the sea level low of the latest Pleistocene glacial maximum was approached, fluvial systems worldwide migrated across continental shelves and built their deltas at or near the shelf-edge. Two excellent data sets consisting of high resolution seismic profiles and cores have been acquired in recent years from two of these shelf-edge deltas in very different climatic and physical process settings, the temperate Lagniappe (Mobile River) delta of the northeastern Gulf of Mexico and tropical Mahakam River delta of the eastern coast of Borneo (Indonesia). Both of these late Pleistocene deltas were built during the latest Pleistocene falling-to-low relative sea-level conditions.
The Lagniappe clinoforms built wedges on a relatively stable shelf under conditions of a low tide range, low wave energy, and seasonal storms. In this setting, siliclastic sedimentation dominated and carbonates had little impact on the sedimentary record. Dating (14C methods) of both the eastern and western Lagniappe depocenters indicated an age of approximately 19 Ka BP. However, a deeper clinoforms wedge that was stratigraphically younger than the western and eastern deltaic depocenters occurred at a depth of approximately 119-126 m water depth. This clinoforms wedge has not been dated, but it is part of the falling-to-low-stand progradation.