IGEBA   23946
INSTITUTO DE GEOCIENCIAS BASICAS, APLICADAS Y AMBIENTALES DE BUENOS AIRES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Geological and geophysical investigations of the main morphosedimentary features of the patagonian continental margin: new data acquired on board of the Austral R/V
Autor/es:
SEBASTIAN PRINCIPI; JUAN PABLO ORMAZABAL; GRAZIELLA BOZZANO; JOSE ISOLA; CESAR ARTUNDUAGA; ALEJANDRO TASSONE; FERMIN PALMA; DANIELA SPOLTORE
Lugar:
Atenas
Reunión:
Conferencia; Regional Conference on Geomorphology; 2019
Institución organizadora:
International Association of Geomorphologists
Resumen:
The Patagonian Continental Margin (PCM) corresponds to the portion of the Argentine continental margin located southwards the outlet of the Río Colorado and its continuation along the Colorado Fracture Zone; it includes the northern Scotia Ridge, and the shelf and continental slope adjacent to continental Patagonia, Tierra del Fuego, and Malvinas Islands. Just a small part of this huge territory has been surveyed with high resolution multi-beam bathymetry, and most of its morphology remains unknown. In the years 2017 and 2018 three cruises were performed on board of the R/V Austral - framed on collaboration between PAMPA AZUL, CONICET, Y-TEC and YPF - where threekey areas of the PCM were surveyed: Tierra del Fuego, Malvinas shelf, and the slope adjacent to continental Patagonia. During these cruises, hydro-acoustic data was acquired with the hull -mounded systems: multi-beam echo-sounders Kongsberg EM 122 and EM Kongsberg 2040, and parametric sub-bottom profler PARASOUND P70. Along with the hydro-acoustic data, 33 sediment cores were obtained in water depths spanning from 130 m to 3480 m. This new set of data revealed the geomorphology of the surveyed areas with unprecedented detail, and a plethora of seafloor features -such as sub-marine canyons, ploughmarks and pockmarks- were imaged for the first time. This contribution aims to introduce the main discoveries of these cruises as well as to discuss the influence that the different processes had in shaping each of the areas. The morphometrical study of the bathymetric data, along with the shallow seismic structure and the sedimentological analysis of the cores provides evidence of a dynamic interplay between gravitational and contouritic processes.