Spatial and Temporal Evolution of a Permian Submarine Slope Channel-Levee System, Karoo Basin, South Africa

Celma, Claudio Di; Brunt, Rufus L.; Hodgson, David M.; Flint, Stephen S.; Kavanagh, John P.

doi:10.2110/jsr.2011.49

Cited by 86 publications

(93 citation statements)

References 57 publications

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“…This observation is consistent with previous studies, which have shown that valley base is a diachronous surface or a composite erosional surface shaped by multiple erosional events (e.g. Deptuck et al, 2003;Sylvester et al, 2011;Kolla et al, 2012;Thomas and Bodin, 2013;Macauley and Hubbard, 2013;Bain and Hubbard, 2016;Di Celma et al, 2011).…”

Section: Possible Causes For Variations In Channel and Valley Morphologysupporting

confidence: 93%

“…Channels hundreds of meters wide, tens of meters high have been documented, on seismic data in the Gulf of Mexico (Sylvester et al, 2012) and Congo (Deptuck et al, 2007;Jobe et al, 2015), and on bathymetric data from offshore California (Maier et al, 2012). Similar channels have also been documented at outcrops (Brunt et al, 2013;Figueiredo et al, 2013;Gardner et al, 2003;Di Celma et al, 2011;Moody et al, 2012;Bain and Hubbard, 2016). Furthermore, km-wide channels are recorded in the modern Amazon and Zaire fans (Pirmez and Flood, 1995;Babonneau et al, 2002).…”

Section: Scale Comparison With Other Submarine Channel Systemsmentioning

confidence: 86%

“…Stratigraphic elements of multiple scales such as channels, channel complexes and channel complex sets have been comprehensively documented in previous studies (e.g. Gardner and Borer, 2000;Gardner et al, 2003;Abreu et al, 2003;Deptuck et al, 2003;McHargue et al, 2011;Di Celma et al, 2011;Thomas and Bodin, 2013;Bain and Hubbard, …”

Section: Introductionmentioning

confidence: 85%

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Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Qin

Alves

Constantine

et al. 2016

Marine and Petroleum Geology

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Detailed morphological analyses of a Pleistocene-Holocene submarine channel system in terms of its hierarchical framework, were carried out using a 3D seismic volume from offshore Espírito Santo, SE Brazil. The channel morphology shows marked variations, with five segments (Segments a to e) being identified along its full length. For example, the cross-sectional area of the channel decreases by a factor of 70 from Segment a to Segment c, and is then followed by a nearly four-fold increase from Segment c to Segment d. The significant changes in channel morphology relate to temporal and spatial variations in flow volume within the channel. In the same channel system, the valley reveals three distinct segments (Segments A to C), with similar aspect ratios but marked variations in morphology along the valley distance. Valley morphological changes are chiefly affected by erosional processes. Segment B is characterised by the largest valley-base width, valley width, and cross-sectional area compared to the other two segments. Valley enlargement in Segment B results from relatively high degrees of lateral channel migration and associated cut bank erosion, leading to the widening of the valley, especially the valley base. In Segment C, the valley is characterised by inner bank erosion in the form of shallow-seated mass failures, which only enlarged the upper part of the valley wall. The spatial variations in both channel and valley morphology documented here suggest an important role of local factors (e.g. salt diapirs, tributaries, overbank collapse) in the development of channel systems. Hence, the morphological analyses developed in this work provide an effective tool for studying channels and valleys on continental slopes around the world.

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Section: Possible Causes For Variations In Channel and Valley Morphologysupporting

confidence: 93%

Section: Scale Comparison With Other Submarine Channel Systemsmentioning

confidence: 86%

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Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Qin

Alves

Constantine

et al. 2016

Marine and Petroleum Geology

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“…1; 2), have been utilised as an analogue for sub-seismic scale depositional elements, and facies distributions for many hydrocarbon fields (e.g. Grecula et al, 2003, Sixsmith et al, 2004, Hodgson et al, 2011aFlint et al, 2011;Di Celma et al, 2011;Brunt et al, 2013a, b;Morris et al, Interpretation 5 2014). Detailed studies have culminated in the correlation of stacked deep water composite sequences across the Karoo Basin over a >2500km 2 area, allowing high resolution study of the evolution of a basin through the stages of its fill (Van der Merwe et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…Grecula et al, 2003;Sixsmith et al, 2004;Di Celma et al, 2011;Van der Merwe et al, 2014). Palinspastic restoration will improve map view configurations such as sediment dispersal patterns, isopach maps and rates of thinning (e.g.…”

Section: Introductionmentioning

confidence: 99%

Palinspastic restoration of an exhumed deepwater system: A workflow to improve paleogeographic reconstructions

et al. 2015

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Facies architecture of submarine channel deposits on the western Niger Delta slope: Implications for grain‐size and density stratification in turbidity currents

et al. 2017

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High‐resolution bathymetry, seismic reflection, and piston core data from a submarine channel on the western Niger Delta slope demonstrate that thick, coarse‐grained, amalgamated sands in the channel thalweg/axis transition to thin, fine‐grained, bedded sands and muds in the channel margin. Radiocarbon ages indicate that axis and margin deposits are coeval. Core data show that bed thickness, grain size, and deposition rate strongly decrease with increasing height above channel thalweg and/or distance from channel centerline. A 5 times decrease in bed thickness and 1–2 ψ decrease in grain size are evident over a 20 m elevation change (approximately the elevation difference between axis and margin). A simplified in‐channel sedimentation model that solves vertical concentration and velocity profiles of turbidity currents accurately reproduces the vertical trends in grain size and bed thickness shown in the core data set. The close match between data and model suggests that the vertical distribution of grain size and bed thickness shown in this study is widely applicable and can be used to predict grain size and facies variation in data‐poor areas (e.g., subsurface cores). This study emphasizes that facies models for submarine channel deposits should recognize that grain‐size and thickness trends within contemporaneous axis‐margin packages require a change in elevation above the thalweg. The transition from thick‐bedded, amalgamated, coarser‐grained sands to thin‐bedded, nonamalgamated, finer‐grained successions is primarily a reflection of a change in elevation. Even a relatively small elevation change (e.g., 1 m) is enough to result in a significant change in grain size, bed thickness, and facies.

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Spatial and Temporal Evolution of a Permian Submarine Slope Channel-Levee System, Karoo Basin, South Africa

Cited by 86 publications

References 57 publications

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Quantitative seismic geomorphology of a submarine channel system in SE Brazil (Espírito Santo Basin): Scale comparison with other submarine channel systems

Palinspastic restoration of an exhumed deepwater system: A workflow to improve paleogeographic reconstructions

Facies architecture of submarine channel deposits on the western Niger Delta slope: Implications for grain‐size and density stratification in turbidity currents

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