A Late Cretaceous mixed (turbidite-contourite) system along the Argentine Margin: Paleoceanographic and conceptual implications

Rodrigues, S.; Hernández-Molina, F. Javier; Kirby, Adam

doi:10.1016/j.marpetgeo.2020.104768

Cited by 35 publications

(26 citation statements)

References 67 publications

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“…7, 9 and 13A). Interestingly, mixed drifts form in other areas of the southern hemisphere during the Late Cretaceous period (e.g., Uruguayan margin: Creaser et al, 2017; Argentine margin; Rodrigues et al, 2019). This could indicate the influence of well-developed bottom currents whose onset can be constrained as Late Cretaceous in age.…”

Section: Seismic Unitmentioning

confidence: 99%

Seismic stratigraphic framework and depositional history for Cretaceous and Cenozoic contourite depositional systems of the Mozambique Channel, SW Indian Ocean

et al. 2020

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Section: Seismic Unitmentioning

confidence: 99%

Seismic stratigraphic framework and depositional history for Cretaceous and Cenozoic contourite depositional systems of the Mozambique Channel, SW Indian Ocean

et al. 2020

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“…Each of the described seismic units thin to the northeast so the succession forms a wedge against a bathymetric high interpreted as a Cretaceous mixed turbidite-contourite system that formed in the distal part of the Colorado Basin (Figs. 1 and 2 E) 5 . A distinctive stacking pattern appears both within and between the seismic units, revealing that the CDS developed over three evolutionary stages (Table 1 and Fig.…”

Section: Dataset and Methodsmentioning

confidence: 99%

“…The depositional and erosional features form a buried CDS whose onset and cessation are respectively marked by discontinuities D1 and D5. Each of the described seismic units thin to the northeast so the succession forms a wedge against a bathymetric high interpreted as a Cretaceous mixed turbidite-contourite system that formed 5 . A distinctive stacking pattern appears both within and between the seismic units, revealing that the CDS developed over three evolutionary stages (Table 1 and Fig.…”

Section: Morphosedimentary Featuresmentioning

confidence: 99%

“…Lateral migration of large sedimentary bodies in deep-marine systems. The asymmetric shape and internal sedimentary stacking pattern of the mounded drift (M) could share some similarities with asymmetric channel-levee systems 9,34 or, channel-levee drifts from a mixed turbidite-contourite system 4,5,35 . However, in the absence of an observed feeder channel (or submarine canyon), and given the clear alongslope orientation and lateral continuity of the depositional and erosional features along the continental rise (rather than in the downslope orientation typically assumed by mixed turbidite-contourite systems), we consider here a pure Contourite Depositional System (CDS) and follow Gruetzner et al (2012) 15 in interpreting M as a large asymmetric mounded drift, because it meets criteria listed in Hernández-Molina et al (2008) 36 .…”

Section: Morphosedimentary Featuresmentioning

confidence: 99%

“…The angle of inclination, sediment supply, composition and vertical accommodation space between the wave base and the flat seafloor determine clinoform length 1 , 3 . In deep marine settings, some recent studies have shown that deposits share similar stacking patterns to clinoforms, though they result from different processes such as lateral migration, these include downslope channel-levee systems, mixed turbidite-contourite systems controlled by downslope and alongslope processes 4 , 5 , giant mounded contourite drifts controlled by bottom currents 1 , 6 , subaqueous sand dunes controlled by internal solitary waves 7 , and deep marine channels where bottom currents, turbidity currents, and internal waves/tides interact 8 .…”

Section: Introductionmentioning

confidence: 99%

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Lateral migration of large sedimentary bodies in a deep-marine system offshore of Argentina

Kirby

Hernández-Molina

Rodrigues

2021

Sci Rep

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Contourite features are increasingly identified in seismic data, but the mechanisms controlling their evolution remain poorly understood. Using 2D multichannel reflection seismic and well data, this study describes large Oligocene- to middle Miocene-aged sedimentary bodies that show prominent lateral migration along the base of the Argentine slope. These form part of a contourite depositional system with four morphological elements: a plastered drift, a contourite channel, an asymmetric mounded drift, and an erosive surface. The features appear within four seismic units (SU1–SU4) bounded by discontinuities. Their sedimentary stacking patterns indicate three evolutionary stages: an onset stage (I) (~ 34–25 Ma), a growth stage (II) (~ 25–14 Ma), and (III) a burial stage (< 14 Ma). The system reveals that lateral migration of large sedimentary bodies is not only confined to shallow or littoral marine environments and demonstrates how bottom currents and secondary oceanographic processes influence contourite morphologies. Two cores of a single water mass, in this case, the Antarctic Bottom Water and its upper interface, may drive upslope migration of asymmetric mounded drifts. Seismic images also show evidence of recirculating bottom currents which have modulated the system’s evolution. Elucidation of these novel processes will enhance basin analysis and palaeoceanographic reconstructions.

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Distribution and Controlling Factors of the Contourites on the Northern Continental Slope of the South China Sea

Wang,

Yu,

Chen

et al. 2024

Geological Journal

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The northern continental margin of the South China Sea (SCS) is an important component of deep‐water circulation, providing excellent conditions for studying bottom currents in a marginal sea. Seismic data were employed to discern the sedimentary patterns prevalent in the deep‐water continental slope sediments on the northern continental margin of the SCS, encompassing gravity flow, contourite and mixed depositional systems. The contourite depositional system includes various types of deposits (such as separated mounded drifts, patch or channel‐related drifts, deformed sheeted drifts, composite drifts, bottom current sediment waves, plastered contourite drifts) and various morphologic erosional features eroded by the bottom current (such as moats, non‐depositional surfaces, troughs and scarps). These contourite features are related to the continental slope's morphology and its sources. The Dongsha slope exhibits distinctive characteristics marked by intense bottom current erosion and deposition, featuring separated mounded drifts and deformed sheeted drifts along its lower slope. The lower slope of the Pearl River showcases a spectrum of bottom current‐induced features, including sediment wave fields, erosion fields and contourite drifts. The southern flank of the Shenhu slope is characterised by a bottom current erosion field, a non‐depositional surface, a sediment wave field and isolated mounded drifts. On the Yingqiong slope, the contourite drifts are limited to its southern flank where gravity flow action is absent, and the complex geomorphology interacts with the bottom current, forming a complex contourite depositional system. The results of this study serve as a foundational framework for further global research on bottom current circulation and hydrodynamics.

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A Late Cretaceous mixed (turbidite-contourite) system along the Argentine Margin: Paleoceanographic and conceptual implications

Cited by 35 publications

References 67 publications

Seismic stratigraphic framework and depositional history for Cretaceous and Cenozoic contourite depositional systems of the Mozambique Channel, SW Indian Ocean

Seismic stratigraphic framework and depositional history for Cretaceous and Cenozoic contourite depositional systems of the Mozambique Channel, SW Indian Ocean

Lateral migration of large sedimentary bodies in a deep-marine system offshore of Argentina

Distribution and Controlling Factors of the Contourites on the Northern Continental Slope of the South China Sea

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