Holocene Delta Evolution and Depositional Models of the Mekong River Delta, Southern Vietnam

Ta, Thi Kim Oanh; Nguyen, Van Lap; Tateishi, Masaaki; Kobayashi, Ichiro; Saito, Yoshiki

doi:10.2110/pec.05.83.0453

Cited by 56 publications

(77 citation statements)

References 34 publications

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“…This association is similar to distal delta front deposits described elsewhere (e.g. the modern tidedominated Yangtze River Delta (Hori et al 2002); the Late Holocene Mekong River Delta (Ta et al 2002(Ta et al , 2005; the Cretaceous Frontier Formation of Wyoming (Willis et al 1999)). It grades upward into the proximal delta front association.…”

Section: Association F-tide-dominated Distal Delta Frontsupporting

confidence: 86%

“…Similarly, the change back from tide-to wavedominated conditions across the LAC-LAD boundary may be linked to cessation of tectonism on the southern shelf. Alternatively, the change from tide-to wave dominance may reflect the increasing influence of waves as the deltas prograded across the shelf, similar to that observed in the Mekong Delta in the Holocene (Ta et al 2005).…”

Section: Eustasy and Its Influence On The Southern Welsh Basin Shelfmentioning

confidence: 76%

“…At the shelf margin, deltas are exposed to the maximum wave energy. During subsequent sea-level rise, bayhead deltas will form in incised valleys, and are likely to be strongly tidal-and fluvially dominated Ta et al 2005;Porębski and Steel 2006). As these deltas subsequently prograde once the incised-valley has been filled by sediment, they begin to experience increasing influence in wave energy and such influence is likely to increase during advanced stages of highstand.…”

Section: Discussion-controls On Sedimentationmentioning

confidence: 99%

“…Support for this hypothesis is gradually emerging in studies of modern and Holocene deltas (e.g. Rodriguez et al 2000;Lambiase et al 2003;Fielding et al 2005;Ta et al 2005) and rock record examples .…”

Section: Introductionmentioning

confidence: 99%

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Process regime change on a Silurian siliciclastic shelf: controlling influences on deposition of the Gray Sandstone Formation, Pembrokeshire, UK

Hillier

Morrissey

2009

Geological Journal

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Shallow marine deposits comprising the Silurian Gray Sandstone Formation (GSF) exhibit pronounced process regime changes through time. The formation was deposited on the southern shelf of the Lower Palaeozoic Welsh Basin (UK), and conformably overlies the Coralliferous Formation. The basal Lithofacies Assemblage A (of Sheinwoodian age) is dominated by a storm-dominated process regime, comprising shoreface and offshore shelf facies associations. The overlying Lithofacies Assemblage B records a mixed process regime, with units being deposited under both storm-and tide-influenced conditions. Tidal-influence prevailed during deposition of the overlying Lithofacies Assemblage C, with proximal to distal facies variations across a significant tide-influenced river delta being observed. A return to stormdominated shoreface conditions is seen in the succeeding Lithofacies Assemblage D. Lithofacies Assemblage E (Homerian age) records the return of a tide-influenced river delta to the area, prior to the conformable transition into the overlying Old Red Sandstone (ORS) Red Cliff Formation (of Ludlow age). Northward thickening of the formation across southern Pembrokeshire into the Musselwick Fault indicates a tectonic control on sedimentation, the formation infilling accommodation space developed in an intra-shelf half-graben. Recurring changes in process regime from storm-to tide-influenced sedimentation may be related to the onset and subsequent cessation of tidal resonance in subbasins across the shelf area which itself was probably controlled by episodic tectonism. It is proposed that the Coralliferous and Gray Sandstone formations comprise the newly erected Marloes Group.

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Section: Association F-tide-dominated Distal Delta Frontsupporting

confidence: 86%

Section: Eustasy and Its Influence On The Southern Welsh Basin Shelfmentioning

confidence: 76%

Section: Discussion-controls On Sedimentationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Process regime change on a Silurian siliciclastic shelf: controlling influences on deposition of the Gray Sandstone Formation, Pembrokeshire, UK

Hillier

Morrissey

2009

Geological Journal

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“…Shore-parallel shelf circulation near the channel mouths is weak and to the northeast during the summer, and is stronger and to the southwest during the winter [Gagliano and McIntire, 1968]. Net transport of sediment is to the southwest [Gagliano and McIntire, 1968] and has formed the Ca Mau peninsula and a shelf clinoform [Ta et al, 2005;Xue et al, 2010]. Despite sometimes energetic shelf conditions, waves within the distributary channels were minimal during our field campaigns.…”

Section: 1002/2015jc010754mentioning

confidence: 83%

Sediment dynamics in the lowerMekongRiver: Transition from tidal river to estuary

et al. 2015

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A better understanding of flow and sediment dynamics in the lowermost portions of large‐tropical rivers is essential to constraining estimates of worldwide sediment delivery to the ocean. Flow velocity, salinity, and suspended‐sediment concentration were measured for 25 h at three cross sections in the tidal Song Hau distributary of the Mekong River, Vietnam. Two campaigns took place during comparatively high‐seasonal and low‐seasonal discharge, and estuarine conditions varied dramatically between them. The system transitioned from a tidal river with ephemeral presence of a salt wedge during high flow to a partially mixed estuary during low flow. The changing freshwater input, sediment sources, and estuarine characteristics resulted in seaward sediment export during high flow and landward import during low flow. The Dinh An channel of the Song Hau distributary exported sediment to the coast at a rate of about 1 t s−1 during high flow and imported sediment in a spatially varying manner at approximately 0.3 t s−1 during low flow. Scaling these values results in a yearly Mekong sediment discharge estimate about 65% smaller than a generally accepted estimate of 110 Mt yr−1, although the limited temporal and spatial nature of this study implies a relatively high degree of uncertainty for the new estimate. Fluvial advection of sediment was primarily responsible for the high‐flow sediment export. Exchange‐flow and tidal processes, including local resuspension, were principally responsible for the low‐flow import. The resulting bed‐sediment grain size was coarser and more variable during high flow and finer during low, and the residual flow patterns support the maintenance of mid‐channel islands.

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Classification, Architecture, and Evolution of Large‐River Deltas

Hori

Saito

2007

Large Rivers

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Holocene Delta Evolution and Depositional Models of the Mekong River Delta, Southern Vietnam

Cited by 56 publications

References 34 publications

Process regime change on a Silurian siliciclastic shelf: controlling influences on deposition of the Gray Sandstone Formation, Pembrokeshire, UK

Process regime change on a Silurian siliciclastic shelf: controlling influences on deposition of the Gray Sandstone Formation, Pembrokeshire, UK

Sediment dynamics in the lowerMekongRiver: Transition from tidal river to estuary

Classification, Architecture, and Evolution of Large‐River Deltas

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