Effects of Variations in Subsidence and Sediment Supply on Parasequence Stacking Patterns

Wehr, F. L.

doi:10.1306/m58581c14

Cited by 9 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Paola (2000), Tetzlaff and Priddy (2001) and Overeem et al (2005) grouped stratigraphic models into geometrical or dynamic classes depending on the type of laws used to approximate erosion, transport and deposition processes. Geometrical models simulate the consequences of sedimentary processes rather than the processes themselves (Overeem et al, 2005), that is to say, they simulate the result of erosion and sedimentation in response to changing environmental parameters (e.g., Cross & Lessenger, 1999; Houston et al, 2000; Kendall et al, 1991; Ross et al, 1994; Strobel et al, 1989; Thorne & Swift, 1991; Wehr, 1993). To the contrary, dynamic models simulate sediment production, transport and deposition processes themselves and include diffusion‐based models.…”

Section: Background To Stratigraphic Numerical Modellingmentioning

confidence: 99%

Estimating sediment transport diffusion coefficients from reconstructed rifted margin architecture: measurements in the Ogooué and Zambezi deltas

et al. 2022

View full text Add to dashboard Cite

Diffusion‐based stratigraphic models are widely used to simulate sedimentary systems and margin deltas. Diffusion‐based models assume that the topographic evolution primarily depends from its slope. Limited attention has however been given to the calibration of the transport coefficients. Here, we evaluate transport coefficient values from natural examples, the Ogooué and Zambezi rifted margin deltas over the last 5 to 12 Ma respectively. We developed a method to estimate transport coefficients based on high resolution seismic stratigraphy analysis of the stratigraphic architecture of these deltas. For each stratigraphic sequence, we calibrated the sand/shale ratios of the deposits, we restored their depositional slopes, we estimated their uncompacted accumulated volumes and we calculated the transport coefficient (Kd) from the sediment flux/slope ratio. Estimated values of Kd fall within one order of magnitude (×0.1 km2/ka), a much narrower range than previously published values (×0.0001 to ×100 km2/ka). We show that the diffusion approximation is optimal at 10–100 km scale and 0.5–1 Ma time resolution, independently of the stratigraphic context. We show that the diffusion assumption is appropriate for the formation of the clinoforms (mainly gravity driven). It is however not optimal for the shelf and distal domains where additional processes (e.g., wave, flood, hemipelagic, turbidites, oceanic current), not accounted for it the diffusion assumption, significantly impact sediment transport. We documented a significant increase of Kd values after 0.9 Ma, coeval of an increase in the amplitude of eustatic variations at this time indicating that the calibration of Kd from present day sedimentary systems might not be optimal for simulations of sedimentary systems before the last million years.

show abstract

Section: Background To Stratigraphic Numerical Modellingmentioning

confidence: 99%

Estimating sediment transport diffusion coefficients from reconstructed rifted margin architecture: measurements in the Ogooué and Zambezi deltas

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Sediment supply is another major factor which impacts the shallowwater delta sand body shoreline trajectory, stacking pattern, spatial facies transition and its sequence evolution (e.g., Galloway, 1989;Jervey, 1988;Kim et al, 2006;Mitchum et al, 1977;Schlager, 1993;Wehr, 1993). Changes in sediment supply result in differences in erosional channel geometry, lobe morphology and the timing of retrogradation and progradation.…”

Section: Sediment Supplymentioning

confidence: 99%

“…Shallow-water deltas, which are different from typical deltaic successions, often developed at low accommodation sedimentary environment (e.g., Buchheim et al, 2000;Hoy & Ridgway, 2003;Lemons & Chan, 1999;Olariu & Bhattacharya, 2006;Postma, 1990) and are characterized by a stable tectonic setting, gentle slope morphology and river-dominated systems (e.g., Donaldson, 1974;Fisk, 1960;Horne et al, 1976;Hoy & Ridgway, 2003;Lee et al, 2007;Lemons & Chan, 1999;Olariu & Bhattacharya, 2006;Plint, 2000;Zhu et al, 2011). Under this condition, seismicity, the speed of lake subsidence and slope angle barely have an impact on the forming process for shallow-water deltas (Gawthorpe et al, 1994(Gawthorpe et al, , 1997Martinsen & Helland-Hansen, 1995;Posamentier & Allen, 1993;Schlager, 1993;Wehr, 1993;Zhang, Liu, Shi, & Jia, 2000). Many researchers considered sediment supply and water oscillation are two main factors that influence the evolvement of shallow-water development (Connell et al, 2012;Kim et al, 2006;Lou et al, 1999;Muto & Steel, 2001;Xia et al, 2002;Zhang et al, 2010;Zhang, Liu, Shi, Cheng, et al, 2000;Zhao, 1987;Zhao et al, 2011;Zhu et al, 2012Zhu et al, , 2013Zou et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Flume experiment study of the formation process and sedimentary characteristics of a shallow‐water delta

et al. 2022

View full text Add to dashboard Cite

This paper investigates the influence of water level oscillation and sediment supply volume on shallow‐water delta development by means of a flume experiment. The experiment simulated the natural water level by dividing a cycle of sediment period into four parts: the draught period, the flood period (FP), the interflood period in a falling limb (IPF) and the interflood period in a rising limb (IPR). During the FP, flooding broke former channels and a large amount of sediments were evenly unloaded at the surface of lobes. Erosion often appeared at the beginning of the IPF and was dominant at low stand. Most sediments were concentrated in incised valleys and unloaded at the channel mouth to form a new lobe during the falling limb. Erosional channels and lobes were broken at the IPR. Sediments homogeneously covered the surface of lobes and few new lobes appeared during the period. Different sediment supplies influenced the characteristics of incised valley and channel style. Low sediment supply to the delta was strongly influenced by water level change, while high sediment supply was mainly affected by fluvial processes. Based on the flow sand content of water, channels can be classified into four types: (a) narrow and deep multiple channels, (b) narrow and shallow branch channels, (c) broad and shallow main channels, and (d) broad and deep stable channels. Their width‐to‐depth ratios are 1.1–3.5, 5.1–12.9, 7.3–20.2, 2.6–4.6, respectively. Most mouth bars were initially formed but then broken by water level oscillation and channel bifurcation. The preserved mouth bars were well preserved at the far end of lobes, where they entered the low‐energy environment.

show abstract

Hierarchy of tectonic control on stratigraphic signatures: Base-level changes during the Early Permian in the Paraná Basin, southernmost Brazil

Holz

Küchle

Philipp

et al. 2006

Journal of South American Earth Sciences

View full text Add to dashboard Cite

Effects of Variations in Subsidence and Sediment Supply on Parasequence Stacking Patterns

Cited by 9 publications

References 0 publications

Estimating sediment transport diffusion coefficients from reconstructed rifted margin architecture: measurements in the Ogooué and Zambezi deltas

Estimating sediment transport diffusion coefficients from reconstructed rifted margin architecture: measurements in the Ogooué and Zambezi deltas

Flume experiment study of the formation process and sedimentary characteristics of a shallow‐water delta

Hierarchy of tectonic control on stratigraphic signatures: Base-level changes during the Early Permian in the Paraná Basin, southernmost Brazil

Contact Info

Product

Resources

About