Basaltic volcanism Miocene 6 sedimentary basin 6 volcanism 6 Holocene 4 Neogene 4 Payenia 4 Payún Matrú 4 Pliocene 4 Retroarc 4 Trachytes 4 basalt 4 crustal thinning 4 orogeny 4 sedimentation 4 Andes 2 Argentina 2 Basalt 2 Conjugate gradient algorithms 2 Constrained inversions 2 Electrical conductivity 2 Electrically conductive 2 Ica 2 Large igneous provinces 2 Magnetotelluric data 2 Magnetotellurics 2 Mendoza 2 Nazca 2 Neuquen 2 Peru 2