Controls on shelf-margin architecture and sediment partitioning during a syn-rift to post-rift transition: Insights from the Barrow Group (Northern Carnarvon Basin, North West Shelf, Australia)

Paumard, Victorien; Bourget, Julien; Payenberg, Tobi; Ainsworth, R. Bruce; George, Annette D.; Lang, Simon; Posamentier, Henry W.; Peyrot, Daniel

doi:10.1016/j.earscirev.2017.11.026

Cited by 75 publications

(59 citation statements)

References 104 publications

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“…Additionally, however, we note that there are also other end‐member Greenhouse scenarios with high supply and high subsidence that promoted very thick topset aggradation and high margin progradation rates (e.g. Barrow Group, NW Australia during an active phase of Cretaceous rift extension; Paumard et al, ).…”

Section: Effects Of Tectonic Subsidence and Climate On Topset Architementioning

confidence: 80%

“…Barrow Group, NW Australia during an active phase of Cretaceous rift extension; Paumard et al, 2018). Finally, it should be noted that with epicontinental margins, such as the Po-Adriatic case shown above, there is a more complex arrangement of margin paleogeography between times of lowstand and highstand of sea level than a simple moving back and forth of the sediment entry point across the pericontinental margin (cf.…”

Section: Case 3: Topset Shaped By Icehouse Sea Level Fall: Po-adriamentioning

confidence: 99%

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What is the topset of a shelf‐margin prism?

et al. 2019

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The siliciclastic topset of a continental margin, or a shelf‐margin prism in subsiding nonplate‐margin deepwater basins, is the flat‐lying upper part of the margin succession; it is coeval basinwards with deepwater slope clinoforms. Topsets develop by the aggradation of repeated, cross‐shelf, shoreline regressions and transgressions, thereby hosting the shelf portion of stacked, fourth‐order stratigraphic sequences. Sediment spreading downdip and along strike during the cross‐shelf transit of the sediment delivery system, as well as process regime changes of deltas and shorefaces (regressive) and of estuaries, barrier–lagoon systems and shelf ridges (transgressive) are highly variable over short distances, so that correlation within a single stratigraphic sequence is far more difficult than correlation of the cross‐shelf maximum flooding surface boundaries. Thickness of individual regressive–transgressive, fourth‐order sequences is given by shelf accommodation, typically <10 m in embayment or on the inner shelf and up to 200 m on outer shelf. Tectonic subsidence and compaction will enhance this thickness only if rates are very high compared to shelf‐transit time. In very high subsidence rate settings, the transgressive tracts are well preserved and often thickly developed. Topset sequences in an Icehouse climate setting tend to have a high proportion and greater landward development of marine vs nonmarine deposits, compared to Greenhouse sequences, because of the importance of eustatic rise of sea level in the former. Previous numerical experiments show that even for very wide shelves and irrespective of Icehouse or Greenhouse conditions, deltas rarely take more than 10 s of ky to reach their shelf edge, suggesting that it is fourth‐order (or higher) sequences that are the fundamental ones in sequence stratigraphy.

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Section: Effects Of Tectonic Subsidence and Climate On Topset Architementioning

confidence: 80%

Section: Case 3: Topset Shaped By Icehouse Sea Level Fall: Po-adriamentioning

confidence: 99%

What is the topset of a shelf‐margin prism?

et al. 2019

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“…1). Developed during a syn-rift (Lower Barrow Group; LBG) to post-rift (Upper Barrow Group; UBG) transition, the recent analysis of Reeve et al (2016) and Paumard et al (2018) provided new insights into the linkages between sedimentary systems and late syn-rift to early post-rift tectonics in extensional basins. Prograding as a moderately deep-water shelfmargin (~100-500 m high clinoforms), the stratigraphic evolution of the LBG was constrained in six 3 rd order seismic sequences (calibrated to dinocyst zones) across four main depocentres (Paumard et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Developed during a syn-rift (Lower Barrow Group; LBG) to post-rift (Upper Barrow Group; UBG) transition, the recent analysis of Reeve et al (2016) and Paumard et al (2018) provided new insights into the linkages between sedimentary systems and late syn-rift to early post-rift tectonics in extensional basins. Prograding as a moderately deep-water shelfmargin (~100-500 m high clinoforms), the stratigraphic evolution of the LBG was constrained in six 3 rd order seismic sequences (calibrated to dinocyst zones) across four main depocentres (Paumard et al, 2018). The LBG, mainly developed under supplydominated conditions, shows significant variations in shelf-margin architecture along-strike due to lateral variations in subsidence regime and shifts in sediment supply that directly impacted the sediment partitioning between the shelf and the deep-water areas (Paumard et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Prograding as a moderately deep-water shelfmargin (~100-500 m high clinoforms), the stratigraphic evolution of the LBG was constrained in six 3 rd order seismic sequences (calibrated to dinocyst zones) across four main depocentres (Paumard et al, 2018). The LBG, mainly developed under supplydominated conditions, shows significant variations in shelf-margin architecture along-strike due to lateral variations in subsidence regime and shifts in sediment supply that directly impacted the sediment partitioning between the shelf and the deep-water areas (Paumard et al, 2018). Therefore, the LBG constitutes a unique laboratory to study the interplay between accommodation variations (under supply-dominated conditions) and sediment transport regime at the shelf-edge (i.e.…”

Section: Introductionmentioning

confidence: 99%

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Shelf-margin architecture and shoreline processes at the shelf-edge: Controls on sediment partitioning and prediction of deep-water deposition style

Paumard

Bourget

Payenberg

et al. 2018

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SUMMARYThe Lower Barrow Group (LBG; Latest Tithonian -Early Valanginian) is a shelf-margin that prograded during a late phase of rifting under various subsidence regimes and supply-dominated conditions. A 3D semi-automatic, full-volume seismic interpretation method allow identifying high-order clinothems presenting an estimated cyclicity of ~40,000 yrs, in which a quantitative analysis of the shelfmargin architecture and shorelines processes was conducted. Overall, three and four main types of hydrodynamic regimes and deepwater systems were identified, respectively. Falling to flat shelf-edge trajectories are associated with sediment bypass, whereas rising shelf-edge trajectories are linked with increasing sediment storage on the shelf. While fluvial to wave processes can be dominant in all A/S conditions, results show that fluvial-dominated coastlines are associated with steep high-angle slope clinoforms and short to longer run-out turbidites. Conversely, wave-dominated coastlines are linked to low-angle slope clinoforms and poor turbidite system development (occasional sheet sand and MTDs). The short and longer run-out turbidite systems present a tripartite architecture (canyon / slope valley; channel; lobes) which mostly appear as short-lived, vertically / laterally stacked elements fed my multiple small rivers forming linear ramp systems. Due to the shallow configuration of the margin (<500m), the presence of short slopes and overall high sand-to-mud ratio, the turbidite systems are smaller scale (<50 km) and probably shorter lived than most modern turbidite systems (100-1000 km). This study sheds new lights on the significant role of shelf-margin architecture (slope gradient, hydrodynamic regime) in predicting the deep-water sediment delivery behavior (sediment partitioning, type of deep-water system).

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