slab Andes 34 Argentina 30 subduction zone 28 deformation 18 Tectonics 16 crustal structure 16 tectonic setting 16 Precordillera 14 foreland basin 14 magmatism 14 Cenozoic 12 Miocene 12 subduction 12 uplift 12 Nazca plate 10 Subduction 10 crustal thickness 10 Andean orogeny 8 Cretaceous 8 Sierras Pampeanas 8 Structural geology 8 asthenosphere 8 deformation mechanism 8 extensional tectonics 8 fold and thrust belt 8 volcanism 8 Central Andes 6 Geochronology 6 Magnetotellurics 6