Direct dating of paleomagnetic results from Precambrian sediments in the Amazon craton: Evidence for Grenvillian emplacement of exotic crust in SE Appalachians of North America

Grenvillian remnants in the Northern Andes: Rodinian and Phanerozoic paleogeographic perspectives

“…The Sunsas Orogen includes evidence of an early 1.2-1.15 Ga remobilization of older basement along shear zones, 1.1-1.08 Ga amphibolite to granulite-facies metamorphism, several post-tectonic and anorogenic phases of magmatism between 1.1 and 0.97 Ga, with final cooling of the orogen constrained at 0.9-1.0 Ga. Paleomagnetic and isotopic constraints suggest that the entire Grenvillian orogeny on the Amazonian Craton took place in a single transpressive with Laurentia and probably some intervening microcontinents beginning at ca. 1.2 Ga (Tohver et al, 2002(Tohver et al, , 2004(Tohver et al, , 2006D Agrella-Filho et al, 2008). However alternative models show that the nature of the colliding continent is far from being resolved (Cordani and Teixeira, 2007a,b;Li et al, 2008;Santos et al, 2008;Chew et al, 2008).…”

A review of the tectonic evolution of the Sunsás belt, SW Amazonian Craton

“…Most of the Mesoproterozoic reconstructions place Amazonia against the eastern Laurentia (e.g., Sadowski and Bettencourt, 1996;Rivers, 1997;Boger et al, 2005;Tohver et al, 2002Tohver et al, , 2005aTohver et al, , 2006D'Agrella-Filho et al, 2008;Elming et al, 2009;Cordani et al, 2009). However, alternative positions are envisaged in order to accommodate smaller crustal fragments like the Arequipa-Antofalla (Peru) and Las Matras complexes (Western Sierras Pampeanas in Argentina) that occur in the Andes (e.g., Litherland et al, 1985;Keppie and Ortega-Gutierrez, 1999;Casquet et al, 2006) -see Krö-ner and Cordani (2003), and Ramos and Aleman (2000) for an outline of Grenvillian-aged reconstructions dealing with Amazônia and the Andes.…”

Detrital zircon fingerprint of the Proto-Andes: Evidence for a Neoproterozoic active margin?

“…Hoffman, 1991), isotopic data (Tohver et al, 2004) and palaeomagnetic reconstructions (e.g. Weil et al, 1998;Tohver et al, 2002;D'Agrella-Filho et al, 2008). Geological evidence includes correlation of Precambrian orogenic belts that were once continuous but are now truncated at the modern-day continental margins (Sadowski and Bettencourt, 1996;Tohver et al, 2004).…”