igneous intrusion Argentina 12 South America 6 emplacement 6 Geochronology 4 Paleozoic 4 Patagonia 4 San Luis 4 Sierras Pampeanas 4 geochronology 4 magma 4 Andes 2 Antarctica 2 Buried intrusive 2 Byers Peninsula 2 Cerro Negro Formation 2 Chile 2 Cladophlebis 2 Cordillera Principal 2 Cretaceous 2 Córdoba 2 Eastern Sierras Pampeanas 2 Elatocladus 2 Famatinian and Achalian cycles 2 Geochemistry 2 Geology 2 Gravimetric model 2 Ground magnetometric survey 2 Jurassic-Cretaceous boundary 2 Las Aguilas 2