Further palaeomagnetic confirmation of the magellanes orocline

Structural, tectonic and glaciological controls on the evolution of fjord landscapes

“…3). This feature is both a physiographic and a structural bend where the major tectonic provinces and geological units gradually change their strike by 90°from north to south (Burns et al, 1980;Ghiglione and Ramos, 2005). Both arms of the arc have been affected by subduction of oceanic crust from the Pacific basin against South America since the late Paleozoic-early Mesozoic, leading to punctuated Andean uplift since the Late Cretaceous (Dalziel, 1981;Cunningham, 1995;Klepeis and Austin, 1997).…”

Geomorphology of marine and glacio-lacustrine terraces and raised shorelines in the northern sector of Península Brunswick, Patagonia, Straits of Magellan, Chile

“…In fact, post-glacial uplift is linked to a complex dynamic and alternation of combined isostatic rebound, eustatic movements and recent tectonic activity (Clapperton, 1990;De Muro et al, 2012;De Muro et al, 2015;Winslow & Prieto, 1991). The present tectonic setting of the Tierra del Fuego region is the result of the relative movements and interactions between three main plates: Antarctica, South America and Scotia (Burns, Rickard, Belbin, & Chamalaun, 1980;Cunningham, Klepeis, Gose, & Dalziel, 1991;Dalziel, Kligfield, Lowrie, & Opdyke, 1973;Lodolo, Menichetti, Tassone, & Sterzai, 2002;Menichetti, Lodolo, & Tassone, 2008). Evidence of recent tectonic activity was reported especially on the Pacific side of the Strait of Magellan (Bartole et al, 2000) and strike-slip faults are known to be linked to the complex dynamics of the collisional margin of the Southern Chilean plate (Lodolo et al, 2003).…”

Constraints on deformation of the Southern Andes since the Cretaceous from anisotropy of magnetic susceptibility

“…Tectonic models proposing oroclinal bending in the Cenozoic, related to the opening of the Drake Passage between South America and Antarctica, initially received the largest consensus (Dalziel et al, 1973;Cunningham, 1993;Kraemer, 2003), but were recently challenged by paleomagnetic data from the sedimentary units of the Magallanes fold-and-thrust belt (Maffione et al, 2010;Poblete et al, 2014). Although alternative hypotheses have also emerged, suggesting a primary origin of the curvature of the Southern Andes (Ramos and Aleman, 2000), oroclinal bending models related to the closure of the Rocas Verdes marginal basin in the Late Cretaceous, proposed originally by Burns et al (1980), represent today a viable mechanism congruent with the known rotation pattern of the Southern Andes (Maffione et al, 2010;Poblete et al, 2014). The regional post-72 Ma 30° CCW rotation of the Fuegian Andes documented by Rapalini et al (2015), although occurring after complete closure of the Rocas Verdes basin, might still be associated to the tip of this major tectonic process.…”