Magmatic activity and strike slip tectonics in the southernmost Andes: Kranck pluton, characterization and preliminary AMS survey

CERREDO, M.E.,; REMESAL, M. B., ; TASSONE, A. A., ; PERONI, J. I., ; MENICHETTI, M.; LIPPAI, H.

Mar del Plata

Conferencia; INTERNATIONAL GEOLOGICAL CONGRESS ON THE SOUTHERN HEMISPHERE 2010; 2010

INTERNATIONAL GEOLOGICAL CONGRESS ON THE SOUTHERN HEMISPHERE

Three major strike-slip structures of dominant WNW-ESE trend characterize the southernmost Andes, from N to S: the Magallanes-Fagnano Fault System (which represents the onland boundary between the South America and Scotia plates), the Carbajal Valley Fault System in central Tierra del Fuego and the Beagle Channel Fault System which separates de Tierra del Fuego Island from the southern archipelago. The Neogene cinematic evolution of the Magallanes-Fagnano Fault System (MFS) is characterized by its transtensive nature with associated pull-apart basins both in onland and onshore areas (Lodolo et al., 2003). These major fault systems are near parallel to the main lineaments of the Late Cretaceous to Tertiary Fuegian fold and