Figure 1

(a) Geological map showing the location of the Furnas Lake Fumarolic Field (FLFF) in mantellic and volcano-magmatic context (Azores, Portugal). The insets show the location of the Azores and of the Furnas Volcano on the São Miguel Island. (b) Geological map showing the location of the Syabru-Bensi Hydrothermal System (SBHS) in metamorphic and active tectonic context (Central Nepal). The inset shows the location in the Nepal map.