plate boundary South America 8 Argentina 6 subduction zone 6 Andes 4 Neuquen Basin 4 Subduction 4 Tierra del Fuego [(ARC) South America] 4 borehole breakout 4 continental margin 4 slab 4 stress field 4 tectonic setting 4 Ambargasta-Sumampa Range 2 Andean orogeny 2 Antofagasta 2 Asthenospheric influx 2 Atlantic Ocean 2 Atlantic Ocean (Southwest) 2 Back-arc basin 2 Buenos Aires [Argentina] 2 Calama 2 Cambrian 2 Central Andes 2 Chaco-Pampean Plain 2 Chile 2 Colorado River [North America] 2 Continental transform system 2 Convergence velocity 2 Convergent plate boundaries 2