fumarole chemical composition 10 Antarctica 8 Copahue 8 Deception Island 8 Neuquen 8 Southern Volcanic Zone 8 Active volcano 6 Hydrothermal system 6 South Shetland Islands 6 geochemistry 6 hydrothermal system 6 volcanic eruption 6 Carbon dioxide 4 Copahue volcano 4 Eruptive column 4 Fluid geochemistry 4 Fumarole 4 Fumarolic gases 4 Geochemical monitoring 4 Geochemistry 4 Monitoring 4 Peteroa Volcano 4 Plinia 4 Seismology 4 Sup-plinian eruption 4 Tephra 4 Volcanic plume 4 Volcanoes 4 crystal 4