collision zone Argentina 18 Gondwana 18 Paleozoic 14 Patagonia 12 South America 12 Andes 10 Chile 10 continental margin 8 magmatism 8 subduction zone 8 tectonic setting 8 Precordillera 6 Sierras Pampeanas 6 convergent margin 6 emplacement 6 microplate 6 orogeny 6 paleomagnetism 6 rifting 6 tectonic evolution 6 Cambrian 4 Central Andes 4 Deformation 4 Devonian 4 Geothermobarometry 4 Jurassic 4 Magmatism 4 North Patagonian Massif 4 Ordovician 4