Recent sediment transport and deposition in the Lisbon–Setúbal and Cascais submarine canyons, Portuguese continental margin

Stigter, Henko de; Jesus, C.; Boer, Wim; Richter, Thomas; Costa, Ana Novo; Weering, Tjeerd C.E. van

doi:10.1016/j.dsr2.2011.04.001

Cited by 65 publications

(29 citation statements)

References 73 publications

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“…In this area, during extreme winter storm events coinciding with major river floods, almost the totality of resuspended sediments along the shelf is transported through the Gulf to the head of the last canyon, in front of the Cape Creus, increasing down-canyon sediment fluxes and sediment transport events Martin et al, in press). Similar behaviors have been reported on the Portuguese margin, where canyons incising the shelf maintain their sedimentary activity during the present-day, acting as sediment traps (De Stigter et al, 2011).…”

Section: Canyon Maintenance Processes Over the Last Glacial Cyclesupporting

confidence: 75%

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Iacono

Sulli

Agate

2014

Deep Sea Research Part II: Topical Studies in Oceanography

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a b s t r a c tSwath-bathymetry, mono-channel and multi-channel seismic reflection records acquired during the last two decades on the northern Sicilian margin have unveiled a dense network of submarine canyons within the depth range of 80-2100 m. The canyons display a relevant variability in their geometry, morphology and sedimentary processes. The margin shows a young, tectonically active shelf to slope setting, linking the Sicilian-Maghrebian Thrust Belt to the Tyrrhenian oceanic realm, developed during the Neogene-Quaternary time span. The aim of this study is to highlight the main governing factors that contributed to the evolution and differentiation of the northern Sicilian canyons, mainly focusing on the Gulf of Palermo and on the Gulf of Castellammare. Tectonic control is more evident in the canyons of the Gulf of Palermo, with submarine landslides retrograding on a steep slope and mainly controlling their evolution. Otherwise, canyons, tributaries and gullies mapped in the Gulf of Castellammare developed on a less steep substrate and display sinuous to meandering paths, with a relevant role of coastal/shelf sedimentary inputs and downslope turbidity processes in their formation. Results suggest that, despite the geographically close proximity of the two study areas, the different structural settings of the Castellammare and Palermo Basins are mainly responsible for canyon variability. Data indicate likely ongoing uplift and tilting movements along the Sicilian margin, influencing the development of the studied canyons, which have probably been more active during the Quaternary glacial maxima than they are in the present day.

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Section: Canyon Maintenance Processes Over the Last Glacial Cyclesupporting

confidence: 75%

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Iacono

Sulli

Agate

2014

Deep Sea Research Part II: Topical Studies in Oceanography

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“…Average acoustic backscatter at 1 m a.b. from the ADCP, which varies in relation to bottom water turbidity, was converted to suspended particulate matter concentration using the empirically derived algorithm described in de Stigter et al (2011). Optical backscatter showed considerable deviation in long-term deployments resulting from biofouling on the optical backscatter sensors.…”

Section: Near-bottom Currents and Sediment Fluxmentioning

confidence: 99%

“…Sediments rich in organic matter is trapped in the upper canyon reaches (e.g. de Stigter et al, 2011), or if effective transport processes like sediment gravity flows or dense shelf water cascading are present, may be transported down-canyon to greater depths (de Stigter et al, 2007;Canals et al, 2013). This capacity to focus organic matter flux is often reflected in enhanced abundance and biomass of benthic fauna within canyons (Maurer et al, 1994;Vetter and Dayton, 1998;Tyler et al, 2009;Ingels et al, 2009;De Leo et al, 2010;Amaro et al, 2010;Huvenne et al, 2011), as well as in more efficient burial of organic carbon in canyon sediments (e.g.…”

Section: Introductionmentioning

confidence: 99%

Organic matter enrichment in the Whittard Channel; its origin and possible effects on benthic megafauna

Amaro

Stigter

Lavaleye

et al. 2015

Deep Sea Research Part I: Oceanographic Research Papers

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“…The movement of sediments both up-and down-canyon by low energy, tide initiated hydrodynamic events (De Stigter et al, 2007, De Stigter et al, 2011and Mulder et al, 2012 also has a significant influence on modern sediment transport. Mulder et al (2012) describe permanent currents that alternate periodically between a down canyon and up canyon motion, the intensity of which are more correlated to internal tides rather than surface tides.…”

Section: Canyon Evolutionmentioning

confidence: 99%

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

Stewart

Davies

Guinan

et al. 2014

Deep Sea Research Part II: Topical Studies in Oceanography

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The Celtic Margin is a complex area in terms of sedimentary dynamics and evolution, with a number of submarine canyons dissecting the continental slope and outer continental shelf. The complex terrain and diverse range of sea-bed sediments play a part in submarine canyons being described as areas of high habitat heterogeneity. This study has concentrated on the heads of two canyons: Dangeard (also known as Dangaard) and Explorer (first named here) located in UK territorial waters, in water depths between 138 and 1165 m. Multibeam echosounder, 2D reflection seismic and photographic ground-truthing data have been combined to map the sea-bed geomorphology, sedimentary features and canyon megafauna of these canyons. In addition, two previously unknown provinces of cold-water coral (CWC) mini-mounds were discovered on the interfluves of the Dangeard and Explorer canyons.The study area comprises a dendritic network of gullies feeding into the canyon thalwegs. Amphitheatre rims, where slope angles are commonly in excess of 20°, occur along the margins and heads of both canyons and are interpreted as drainage basins indicative of retrogressive mass-wasting in a shelfward direction.The CWC mini-mounds occur in water depths between 250 m and 410 m, with more than 400 mounds identified. They are up to 3 m in height and 50-150 m in diameter with no sub-surface expression, suggesting these mounds are, in geological terms, relatively young and possibly Holocene in age. Biological analyses revealed that the mounds form a habitat for ophiuroids and Munida associated with Lophelia pertusa coral rubble, suggesting these mini-mounds are not present-day living features.

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Recent sediment transport and deposition in the Lisbon–Setúbal and Cascais submarine canyons, Portuguese continental margin

Cited by 65 publications

References 73 publications

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Submarine canyons of north-western Sicily (Southern Tyrrhenian Sea): Variability in morphology, sedimentary processes and evolution on a tectonically active margin

Organic matter enrichment in the Whittard Channel; its origin and possible effects on benthic megafauna

The Dangeard and Explorer canyons, South Western Approaches UK: Geology, sedimentology and newly discovered cold-water coral mini-mounds

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