Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Evolution of complex giant seafloor depressions at the northern Argentine continental margin (SW Atlantic Ocean) under the influence of a dynamic bottom current regime

“…Fluid migration linked to seafloor depressions has been reported in different areas along the southwestern Atlantic continental margin. Subcircular depressions and acoustic anomalies have been documented at the Patagonian continental margin (Muñoz et al, 2012;Muñoz et al, 2013;Isola et al, 2020;Isola et al, 2021). In accordance with previous work by Jané et al (2010) and Roy et al (2014), they proposed that vertical diffuse fluid flow in permeable strata above faults constrained the pockmark distribution and appearance.…”

A First Approach to Assess the Impact of Bottom Trawling Over Vulnerable Marine Ecosystems on the High Seas of the Southwest Atlantic

“…These gas and fluid seepages contributed to the formation of canyons and to the partial detachment of blocks from the canyon walls. Thus, the thermogenic gas responsible for the formation of the identified pockmarks on the middle slope could be deep-seated, probably related to the Falkland Rift Basin, north of the Falkland (Malvinas) Islands [80,81]. The association of gas seepage with deep-water corals has been reported by [82] in pockmarks off Brazil.…”

Epibiotic relationships on Zygochlamys patagonica (Mollusca, Bivalvia, Pectinidae) increase biodiversity in a submarine canyon in Argentina

“…It is dominated by soft sediments, mainly composed of sand with minor quantities of shells and mud; its external edge, where the continental slope starts, varies between 110 and 165 m depth approximately (Parker et al, 1997). The continental slope is cut by multiple deep submarine canyons and channels, crossing the upper continental slope in a W-E direction, and organised in two submarine canyon systems, the Ameghino and the Patagonia (or Almirante Brown) systems (Ewing et al, 1964;Lastras et al, 2011;Muñoz et al, 2013). The greatest canyon density was found on the continental slope between 421S and 461S, namely the Ameghino canyon system (Lonardi and Ewing, 1971).…”

“…The greatest canyon density was found on the continental slope between 421S and 461S, namely the Ameghino canyon system (Lonardi and Ewing, 1971). The Argentine continental margin is the result of the interaction of synchronous contourite and turbidity currents, the former modelling the general margin morphology in terraces and escarpments, and the latter creating the Argentine submarine canyons (Lastras et al, 2011;Muñoz et al, 2013).…”

“…In this study, general results from the area located between 41130′ and 481S on the Argentine continental margin are shown, outside the Argentinean Economic Exclusive Zone. The main results divide the area in two regions (41130′-451S and 45-481S), with the results on seafloor geomorphology, sedimentology and structure of the southernmost area (from 44130′S to 481S and from 591W to nearly 611W) extensively described and explained in Lastras et al (2011) and Muñoz et al (2012Muñoz et al ( , 2013. The studies are based on a series of multidisciplinary Spanish research surveys that aimed for a qualitative and quantitative description of the biotopes, ecosystems and communities of the area.…”