The formation and development of avulsions and splays of submarine channel systems: Insights from 3D seismic data from the northeastern Bengal Fan

Qi, Kun; Gong, Chenglin; Steel, Ronald J.; Shao, Dali; Ding, Linfeng; Ma, Hongxia

doi:10.1016/j.sedgeo.2022.106239

Cited by 5 publications

(2 citation statements)

References 53 publications

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“…This may be the location of a channel avulsion in the future, but a clear splay has yet to be produced. We interpret ridge network 1, which is oriented perpendicular to Aeolis Serpens (Figure 6c) and is the only network with a lower stratigraphic position (Figure 2a), to be a possible splay (e.g., Qi et al, 2022, their Figure 4).…”

Section: Aeolis Serpens Was a Submarine Channel Beltmentioning

confidence: 95%

Paleogeographic Reconstructions of an Ocean Margin on Mars Based on Deltaic Sedimentology at Aeolis Dorsa

Cardenas

Lamb

2022

JGR Planets

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The evidence for an ancient ocean in Mars' northern hemispheric basin during the Noachian/Hesperian is contentious. Much of the work is based on the modern topography by assuming that erosion has not significantly reshaped the Martian surface over the last 3.5 billion years, despite evidence to the contrary. Here, we provide new evidence for a northern ocean or large sea based on stratigraphic analysis of sedimentary basin fill exposed at Aeolis Dorsa. We mapped over 6,500 km of fluvial ridges, grouped them into 20 systems, and present evidence that they are the eroded remnants of river deltas or submarine‐channel belts, together defining the stratigraphy of an ancient ocean margin. We used Context Camera stereo‐pair elevation models to measure the stratigraphic positions of each system and used branching directions to determine paleoflow directions. By grouping landforms based on stratigraphic position and paleoflow directions, we reconstructed the paleogeography at Aeolis Dorsa over 5 timesteps; all cases differ from the modern topography. We tracked the initial regression and later transgression of a shoreline during at least 900 m of sea‐level rise, a scale consistent with a northern ocean on a warm and wet early Mars.

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Section: Aeolis Serpens Was a Submarine Channel Beltmentioning

confidence: 95%

Paleogeographic Reconstructions of an Ocean Margin on Mars Based on Deltaic Sedimentology at Aeolis Dorsa

Cardenas

Lamb

2022

JGR Planets

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“…Avulsion is a key control on hierarchy formation because it is the main process forming clustered entities such as lobes. Avulsion in Lobyte3D happens in a simplified and specific way that likely does not capture the range of different and perhaps more complex mechanisms that operate in real submarine fan systems (Hamilton et al, 2015;Ortiz-Karpf et al, 2015;Qi et al, 2022;de Haas et al, 2016). Clearly therefore further modelling and model development is required, with Lobyte3D or other process models including analogue models perhaps, to explore how other avulsion processes might behave differently and produce hierarchical clustering.…”

Section: Absence Of Hierarchymentioning

confidence: 99%

Deep-Water Fan Hierarchy: Assumptions, Evidence, and Numerical Modelling Analysis

Tahiru,

Burgess,

Stevenson

2024

Preprint

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Submarine fan strata are commonly described and interpreted assuming a nested,hierarchical organisation of elements, from beds, to lobe elements, lobes and lobecomplexes. However, describing outcrop and subsurface strata following a particularconceptual method or model is never evidence in itself that the model or methodaccurately reflects the true nature of the strata. To develop better understanding of andmethods for robust hierarchy identification and measurement we developed twometrics, a clustering strength metric that measures how much clustering is present inthe spatial distribution of beds on a submarine fan, and a hierarchy step metric thatindicates how many clustered hierarchical elements are present in the bed spatialdistribution. Both metrics are applied to two quantitative fan models. The first is a verysimple geometric model with 10 realisations ranging from a perfectly clusteredhierarchy to a indistinguishable-from-random arrangement of beds. The second model,Lobyte3D, is a reduced-complexity process model which uses a steepest descent flowrouting algorithm, combined with a simple but physically reasonable representation offlow velocity, erosion, transport and deposition thresholds, to generate detailed 3Drepresentations of submarine fan strata. Application of the cluster strength andhierarchy step metric to the simpler model demonstrates how the metrics usefullycharacterise how much order and hierarchy is present in the fan strata. Application tofour Lobyte3D models with increasingly complex basin-floor topography shows noevidence for true hierarchy, despite clear self-organisation of the model strata intolobes, suggesting that either Lobyte3D is missing key as yet unidentified processesresponsible for producing hierarchy, or that interpretations of hierarchy are not realistic.

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Tectonic influence on the evolutionary dynamics of deep-water channel systems along the active accretionary prism margin in the Rakhine Basin, Myanmar: A high-resolution 3d seismic analysis

Ma,

Luan,

Raveendrasinghe

et al. 2024

Geomorphology

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The formation and development of avulsions and splays of submarine channel systems: Insights from 3D seismic data from the northeastern Bengal Fan

Cited by 5 publications

References 53 publications

Paleogeographic Reconstructions of an Ocean Margin on Mars Based on Deltaic Sedimentology at Aeolis Dorsa

Paleogeographic Reconstructions of an Ocean Margin on Mars Based on Deltaic Sedimentology at Aeolis Dorsa

Deep-Water Fan Hierarchy: Assumptions, Evidence, and Numerical Modelling Analysis

Tectonic influence on the evolutionary dynamics of deep-water channel systems along the active accretionary prism margin in the Rakhine Basin, Myanmar: A high-resolution 3d seismic analysis

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