Intrinsic controls on the range of volumes, morphologies, and dimensions of submarine lobes

Prélat, Amandine; Covault, Jacob A.; Hodgson, David M.; Fildani, Andrea; Flint, Stephen S.

doi:10.1016/j.sedgeo.2010.09.010

Cited by 165 publications

(199 citation statements)

References 30 publications

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“…Moreover, according to Prélat et al (2010), depositional lobes dimensions are controlled by autogenesis, because their dimensions, particularly volume, are similar in the six deep-water fans studied, with different sediment supply characteristics. On the other hand, it was found that lobe dimensions had a large variation of their dimensions and shape, in terms of length, width and L/W ratio in systems with the same sediment supply characteristics, suggesting a dimension and shape stochastic behaviour of the depositional lobes.…”

Section: Autogenic Controls On the Simulated Deep-water Fans Morphologymentioning

confidence: 98%

“…The comparison between the HDTC lobes and the lobes of some modern deep-water fans (Prélat et al 2010) used the L/W ratio (Fig. 16).…”

Section: *Data From Somme Et Al (2009)mentioning

confidence: 99%

“…The main sandy deposits are generated by turbidity currents, a sediment density flow in which the fluid turbulence acted as the grains support mechanism (Kuenen 1950, 1951,Lowe 1982, which can store hydrocarbon in deep-water fan systems as lobe complexes and their elements, commonly located at the most distal areas of deep-water fans (Prélat et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies , Hajek et al 2010, Jerolmack & Paola 2010, Prélat et al 2010, Wang et al 2011 on autogenic dynamics and allogenic controls have been focused on autogenic signatures within the sedimentary record. They intend to verify whether these records can be distinguished from allogenic signatures or mask some allogenic processes.…”

Section: Introductionmentioning

confidence: 99%

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Autogenic influence on the morphology of submarine fans: an approach from 3D physical modelling of turbidity currents

2017

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Autogenic controls have significant influence on deep-water fans and depositional lobes morphology. In this work, we aim to investigate autogenic controls on the topography and geometry of deep-water fans. The influence of the sediment concentration of turbidity currents on deep-water fans morphology was also investigated. From the repeatability of 3D physical modeling of turbidity currents, two series of ten experiments were made, one of high-density turbidity currents (HDTC) and another of low-density turbidity currents (LDTC). All other input parameters (discharge, sediment volumetric concentration and grain size median) were kept constant. Each deposit was analyzed from qualitative and quantitative approaches and statistical analysis. In each experimental series, the variability of the morphological parameters (length, width, L/W ratio, centroid, area, topography) of the simulated deep-water fans was observed. Depositional evolution of the HDTC fans was more complex, showing four evolutionary steps and characterized by the self-channelizing of the turbidity current, while LDTC fans neither present self-channelizing, nor evolutionary steps. High disparities on the geometrical parameters of the fans, as characterized by the elevated relative standard deviation, suggest that autogenic controls induced a stochastic morphological behaviour on the simulated fans of the two experimental series. KEYWORDS:Autogenic controls; Deep-water fans morphology; Turbidity currents; Physical modeling; Sediment concentration. (comprimento, largura, razão comprimento/largura, área, topografia RESUMO: Controles autogênicos influenciam significativamente a morfologia dos leques de águas profundas e seus lobos deposicionais. Neste trabalho, objetivamos investigar a ação dos controles autogênicos sobre a topografia e a geometria de leques de águas profundas, bem como a influência da concentração de sedimentos gerados por correntes de turbidez sobre a morfologia destes. Por meio da repetibilidade de experimentos de modelagem física 3D de correntes de turbidez, foram realizadas duas séries de experimentos: correntes de turbidez de alta densidade (HDTC) e correntes de turbidez de baixa densidade (LDTC). Todos os demais parâmetros de entrada (vazão, concentração volumétrica de sedimentos e tamanho de grão) foram mantidos constantes. Cada depósito foi analisado mediante abordagens qualitativas e quantitativas e análise estatística. Em cada série experimental, foi observada a variabilidade dos parâmetros morfológicos dos depósitos gerados

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Section: Autogenic Controls On the Simulated Deep-water Fans Morphologymentioning

confidence: 98%

“…The comparison between the HDTC lobes and the lobes of some modern deep-water fans (Prélat et al 2010) used the L/W ratio (Fig. 16).…”

Section: *Data From Somme Et Al (2009)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Autogenic influence on the morphology of submarine fans: an approach from 3D physical modelling of turbidity currents

2017

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“…Triggers for avulsion events include allocyclic controls such as changes in climate, sea level, or tectonics (Kolla, 2007;Maier et al, 2012). Autocyclic controls may include increasing channel sinuosity (Kolla, 2007), limited downstream accommodation, and backfilling of individual channel thalwegs caused by lobe deposition (Prélat et al, 2010) or breaching of a levee and response to a changed base level (Fildani et al, 2006;Brunt et al, 2013a;Covault et al, 2014;Ortiz-Karpf et al, 2015). However, the lack of longitudinal migration of the C2 avulsion node points to an underlying control, such as a break-in-slope, although this is too subtle to resolve at outcrop.…”

Section: An Exhumed Example Of An Avulsion Nodementioning

confidence: 99%

Integrating outcrop and subsurface data to assess the temporal evolution of a submarine channel–levee system

et al. 2016

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The morphological evolution of submarine channel systems can be documented using high-resolution three-dimensional seismic data sets. However, these studies provide limited information on the distribution of sedimentary facies within channel fills, channelscale stacking patterns, or the detailed stratigraphic relationship with adjacent levee-overbank deposits. Seismic-scale outcrops of unit C2 in the Permian Fort Brown Formation, Karoo Basin, South Africa, on two subparallel fold limbs comprise thin-bedded successions, interpreted as external levee deposits, which are adjacent to channel complexes, with constituent channels filled with thick-bedded structureless sandstones, thinner-bedded channel margin facies, and internal levee deposits. Research boreholes intersect all these deposits, to link sedimentary facies and channel stacking patterns identified in core and on image logs and detailed outcrop correlation panels. Key characteristics, including depth of erosion, stacking patterns, and cross-cutting relationships, have been constrained, allowing paleogeographic reconstruction of six channel complexes in a 36-km 2 (14-mi 2 ) area. The system evolved from an early, deeply incised channel complex, through a series of external levee-confined and laterally stepping channel complexes culminating in an aggradational channel complex confined by both internal and external levees. Down-dip divergence of six channel complexes from the same location suggests the presence of a unique example of an exhumed deep-water avulsion node. Down-dip, external levees are supplied by flows that escaped from channel complexes of different ages and spatial positions and are partly confined and share affinities with internal levee successions. The absence of frontal lobes suggests that the channels remained in sand bypass mode immediately after avulsion.

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Entangled external and internal controls on submarine fan evolution: an experimental perspective

Ferguson

Kane

Eggenhuisen

et al. 2020

The Depositional Record

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Submarine fans are formed by sediment‐laden flows shed from continental margins into ocean basins. Their morphology represents the interplay of external controls such as tectonics, climate and sea level with internal processes including channel migration and lobe compensation. However, the nature of this interaction is poorly understood. Physical modelling was used to represent the evolution of a natural‐scale submarine fan deposited during an externally forced waxing‐to‐waning sediment supply cycle. This was achieved by running five successive experimental turbidity currents with incrementally increasing then decreasing sediment supply rates. Deposits built upon the deposits of earlier flows and the distribution of erosion and deposition after each flow was recorded using digital elevation models. Initially, increasing sediment supply rate (waxing phase) led to widening and deepening of the slope channel, with basin‐floor deposits compensationally stepping forwards into the basin, favouring topographic lows. When sediment supply rate was decreased (waning phase), the slope‐channel filled as the bulk of the deposit abruptly back‐stepped due to interaction with depositional topography. Therefore, despite flows in the waxing and waning phases of sediment supply having nominally identical input conditions (i.e. sediment concentration, supply rate, grain size, etc.), depositional relief led to development of markedly different deposits. This demonstrates how external controls can be preserved in the depositional record through the progradation of basin floor deposits but that internal processes such as compensational stacking progressively obscure this signal through time. This evolution serves as an additional potential mechanism to explain commonly observed coarsening and thickening‐upwards lobe deposits, with abrupt transition to thin fine‐grained deposits. Meanwhile within the slope channel, external forcing was more readily detectable through time, with less internally driven reorganization. This validates many existing conceptual models and outcrop observations that channels are more influenced by external forcing whilst internal processes dominate basin floor lobe deposits in submarine fans.

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Intrinsic controls on the range of volumes, morphologies, and dimensions of submarine lobes

Cited by 165 publications

References 30 publications

Autogenic influence on the morphology of submarine fans: an approach from 3D physical modelling of turbidity currents

Autogenic influence on the morphology of submarine fans: an approach from 3D physical modelling of turbidity currents

Integrating outcrop and subsurface data to assess the temporal evolution of a submarine channel–levee system

Entangled external and internal controls on submarine fan evolution: an experimental perspective

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