The Late Quaternary Brazos and Colorado Deltas, Offshore Texas, U.S.A.—THEIR Evolution and the Factors That Controlled Their Deposition

Abdulah, Kenneth C.; Anderson, John B.; Snow, Jennifer N.; Holdford-Jack, Lynette

doi:10.2110/pec.04.79.0237

Cited by 27 publications

(79 citation statements)

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“…Prior work on the continental shelf offshore of the study area has shown that the paleoshoreline retreated in discrete delta backstepping events on three occasions in the Holocene (Abdulah et al, 2004). The first and second backstepping events formed new shorelines located 60 and 40 km offshore of the present coast.…”

Section: Aggradation As a Precursor To Avulsion-by-progradationmentioning

confidence: 89%

“…Thus, a second proxy, the timing and proximity of the retreating shoreline during delta backstepping as sea level rose, was correlated with the aggradation curve. The timing and positions of the retreating shoreline help refine the relationship between the valley aggradation curve and sea level rise (Snow, 1998;Abdulah et al, 2004), but only when integrated with a detailed map of continental shelf bathymetry. Aerial photographs and DEMs were used to investigate suspected structural control on the valley morphology.…”

Section: Methodsmentioning

confidence: 99%

“…9). The first significant decrease in gradient occurs several meters above the 11.5-ka shoreline and may have allowed the shoreline to backstep to its position at 9.5 ka (Snow, 1998;Abdulah et al, 2004). The second decrease in Fig.…”

Section: Aggradation As a Precursor To Avulsion-by-progradationmentioning

confidence: 99%

“…However, unlike the Rhine-Meuse fluvial system, which has maintained several distributaries throughout the Holocene (Törnqvist, 1994;Berendsen, 2000, 2001), the Brazos fluvial system is simpler. The Brazos River has maintained only one active channel at any one time since the middle Holocene and possibly the early Holocene (Snow, 1998;Fraticelli, 2003;Abdulah et al, 2004). Both the Brazos and the Colorado Rivers have maintained a high sediment yield for the duration of the latest sea level rise.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The influence of valley aggradation and listric normal faulting on styles of river avulsion: A case study of the Brazos River, Texas, USA

Taha

Anderson

2008

Geomorphology

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Section: Aggradation As a Precursor To Avulsion-by-progradationmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Aggradation As a Precursor To Avulsion-by-progradationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The influence of valley aggradation and listric normal faulting on styles of river avulsion: A case study of the Brazos River, Texas, USA

Taha

Anderson

2008

Geomorphology

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“…The slope sediment fans are associated with Quaternary lowstands of sea level. Examples are on the Texas coast where such fans are tied to ancestral courses of the Brazos River and Colorado River (Abdullah et al 2004). These fans begin at about the 200-m (656-ft) isobaths, essentially at the shelf-slope break, and descend down the slope.…”

Section: Continental Slopementioning

confidence: 99%

Sediments of the Gulf of Mexico

Davis

2017

Habitats and Biota of the Gulf of Mexico: Before the Deepwater Horizon Oil Spill

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Holocene progradation and retrogradation of the Central Texas Coast regulated by alongshore and cross‐shore sediment flux variability

Odezulu

Swanson

Anderson

2020

The Depositional Record

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Fifteen transects of sediment cores located off the central Texas coast between Matagorda Peninsula and North Padre Island were investigated to examine the offshore record of Holocene evolution of the central Texas coast. The transects extend from near the modern shoreline to beyond the toe of the shoreface. Lithology, grain size and fossil content were used to identify upper shoreface, lower shoreface, ebb‐tidal delta and marine mud lithofacies. Interpretations of these core transects show a general stratigraphic pattern across the study area that indicates three major episodes of shoreface displacement. First, there was an episode of shoreface progradation that extended up to 5 km seaward. Second, an episode of landward shoreline displacement is indicated by 3–4 km of marine mud onlap. Third, the marine muds are overlain by shoreface sands, which indicates another episode of shoreface progradation of up to 5 km seaward. Radiocarbon ages constrain the onset of the first episode of progradation to ca 6.5 ka, ending at ca 5.0 ka when the rate of sea‐level rise slowed from an average rate of 1.6–0.5 mm/yr. Results from sediment budget calculations and sediment transport modelling based on reasonable estimates of an ancient shoreline shape and wave climate indicate that the first progradation was a result of sand supplied from erosion of the offshore Colorado and Rio Grande deltas. The transgressive phase occurred between ca 4.9 ka and ca 1.6 ka and coincided with a major expansion of the Texas Mud Blanket, which resulted in burial of offshore sand sources and the shoreface being inundated with mud. The second, more recent episode of shoreface progradation began ca 500 years ago with a maximum rate of ca 6 m/yr. This most recent change signals a healing phase of coastal evolution from the late Holocene transgressive event. Currently, the shoreline along the central Texas coast is retreating landward at an average rate of 0.30 m/yr, indicating that the second progradation event has ended.

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The Late Quaternary Brazos and Colorado Deltas, Offshore Texas, U.S.A.—THEIR Evolution and the Factors That Controlled Their Deposition

Cited by 27 publications

References 0 publications

The influence of valley aggradation and listric normal faulting on styles of river avulsion: A case study of the Brazos River, Texas, USA

The influence of valley aggradation and listric normal faulting on styles of river avulsion: A case study of the Brazos River, Texas, USA

Sediments of the Gulf of Mexico

Holocene progradation and retrogradation of the Central Texas Coast regulated by alongshore and cross‐shore sediment flux variability

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