The Austral Basin (or Magallanes Basin) in southern Argentina is situated in a highly active tectonic zone. The openings of the South Atlantic and the Drake Passage to the east and south, active subduction in the west, and the related rise of the Andes have massively influenced the evolution of this area. In order to better understand the impacts of these tectonic events on basin formation to its present-day structure we analyzed 2D seismic reflection data covering about 95.000 km² on-and 115.000 km² offshore (Austral "Marina"

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8The Malvinas Basin is located in the southernmost Argentinian continental margin. Despite 9 the lack of commercial hydrocarbon accumulation discoveries, the presence of thermogenic 10 gas in gravity cores and seafloor oil slicks point to the existence of an active petroleum 11 system in this basin.