**2. Effusive monogenetic volcanoes**

The way that magma is monogenetically released to the Earth surface is related to the internal magma dynamic that occurred in the last dozens of meters [27]. It also depends on the form and dimensions of the conduit with the ascending magma. Whether the magma encounters water en route, a process known as MFCI (Molten-Fuel Coolant Interaction) occurs and therefore, it drives the eruption [28, 29]. In this case, the eruptive style depends mostly on the amount of water that the magma encounters [30] and the lithology where this water (usually an aquifer) is stored (e.g. sediments vs. fractured metamorphic rocks) (e.g. [31–33]; this last also associated with the easiness for the water to be released. However, whether the magma reaches the surface without any interaction with water, the eruption may occur in two ways: 1) explosive, whether the magma is fragmented by the volatiles dynamics (i.e. exsolution, nucleation, growth and coalescence) associated with pressure decreasing, or 2) effusive, whether degassing is effective, linked to bubbles interconnection avoiding the magma fragmentation [34]. The first eruptive manner builds scoria cones (e.g. the historical Jorullo [35–37] and Paricutín volcanoes in México [38]), while the second one produces lava bodies (e.g. The Villamaría-Termales Monogenetic Volcanic Field in Colombia; [5]). As previously mentioned, these emissions are commonly part of the explosive activity forming any kind of pyroclastic cone; however, they can also

**135**

**Figure 2.**

**Figure 1.**

*couleé in Manizales, Colombia.*

*Effusive Monogenetic Volcanism*

*DOI: http://dx.doi.org/10.5772/intechopen.94387*

dominate and create individual effusive volcanoes (**Figure 1**). Because of this, we propose here these effusive products as part of a monogenetic volcano classification scheme and add them to those produced by magmatic activity (**Figure 2**). Accordingly, we propose to distinguish them between lava domes, coulées, small-shields and lava

*Effusive monogenetic volcanoes. (A) Güneydag lava dome in Anatolia, Turkey; (B) Victoria lava dome and Victoria lava flow in Manizales, Colombia; (C) El Bosque small-shield in Morelia, México. (D) Tesorito* 

*Classification scheme of monogenetic volcanoes and their relationship with their eruptive style.*
