ignimbrite Argentina 22 Jurassic 10 Patagonia 10 South America 8 lava flow 8 sandstone 8 Ignimbrites 6 Mendoza 6 Volcanic rocks 6 Volcanism 6 magmatism 6 pyroclastic deposit 6 volcanic ash 6 volcanism 6 Andes 4 Choiyoi Magmatic Cycle lower section 4 Eocene 4 Hydrothermal alteration 4 Lithology 4 Metals geochemistry 4 Miocene 4 Permian 4 Porphyry copper 4 San Rafael Massif 4 San rafael massif 4 Tectonics 4 Volcanoes 4 breccia 4 copper 4