**6. Concluding remarks**

Monogenetic volcanism in northern Chile (18–28° Lat. S) is represented by 907 centers characterized by small (e.g., SC2 scoria cone) and large-volume (e.g., La Torta de Tocorpuri dome) volcanic structures. It exhibits a wide range of composition, from basaltic andesite (e.g., Cerro Overo) to rhyolite (e.g., Corral de Coquena) and a wide spectrum of volcanic landform, lithofacies, and hydromagmatic and magmatic eruptive styles (with the transition from explosive to effusive, and vice versa).

Among these eruptive styles, the most abundant activity corresponds to effusive and Strombolian eruptions. In contrast, the fewer frequency activities are the phreatomagmatic and Surtseyan eruptions (**Figure 3**), which is concordant with an arid climate in northern Chile from the Miocene [41, 90]. This could be related to the degree of glaciation because when everything is too cold and frozen, not a lot of water can infiltrate to become groundwater. At the same time, in warmer periods, meltwater can form lakes or flow toward basins from the peaks.

Although the numbers of monogenetic volcanoes represented in this contribution are limited by the exposure, and more features could be hidden by Neogene sedimentary and volcanic cover. Monogenetic volcanoes were mainly emplaced during Pleistocene and Miocene, generating scoria cones, domes, lava flows, maars, and tuff cones, in order to decrease. The relative abundance of volcanic features is, in part, limited by the amount of time for eruptions, where the spike in the Pleistocene is prominent, for being a short time period (~2 Ma). While the preservation of Miocene features is also notable in that they are still accessible favored by the arid climate in northern Chile from the Miocene.

Spatially, monogenetic volcanoes are mainly associated with NW-striking lineaments or with the intersections of NW-striking lineaments, NNW-to-NNE-striking faults, and WNW-striking lineaments, in decreasing order. Although the main tectonic setting in northern Chile corresponds to the compressional environment, tectonic phases of Quaternary crustal relaxation (neutral to extensional stresses) could have favored the rising of magmas in small batches up from the source (deep or shallow) to the surface.

A general eruptive model for monogenetic volcanoes in northern Chile is proposed in this work, where the external (e.g., magma reservoirs or groundwater availability) and internal (e.g., magma ascent rate or interaction *en-route* to the surface) conditions determine the changes in eruptive style, lithofacies, and magmatic processes involved in the formation of monogenetic volcanoes. Especially during explosive volcanic eruptions, which involve interaction with water, the resulting volcanic lithofacies and architecture will be diverse, reflecting the potential hazards that future eruptions could generate. The understanding of the tectonic and hydrologic setting of the region using traditional geophysics and volcanology surveys should play an essential role in volcanic monitoring, particularly in localities of the Altiplano (e.g., Ollagüe and Talabre village) located nearby active stratovolcanoes presenting permanent fumarolic activity (e.g., Guallatiri, Ollagüe or Lascar stratovolcanoes). This is especially important if such monogenetic volcanoes are surrounded by water-saturated high altitude sedimentary basins, such as salt flats (e.g., Salar de Carcote, Lejía, or Chungara lakes), where even a small-volume of any type of magma ascent could erupt in complex volcanic eruptions in northern Chile.
