Cerro Overo maar and La Albóndiga lava dome are two independent monogenetic volcanoes located in the Central Volcanic Zone of the Andes in northern Chile, close to the active Lascar and Chiliques volcanoes. Cerro Overo maar was formed <77 ka ago by explosive-effusive eruptions, including phreatomagmatic activity, while La Albóndiga lava dome (Pleistocene) is the result of magmatic explosive-effusive activity alone. Cerro Overo and La Albóndiga are characterized by deposits composed of pyroclastic rocks and dense coherent lava blocks. At Cerro Overo, these deposits are located around the crater rim, while at La Albóndiga, they form coherent in situ lava dome features. Cerro Overo also displays thin ash- and lapilli-dominated deposit layers presumed to be pyroclastic surge deposits, which include juvenile pyroclasts exhibiting cauliflower textures, numerous exotic accidental lithics, and ballistically transported lapilli, bombs, blocks, and bomb sags. These fragments include recycled, juvenile pyroclasts, as well as material from older volcanic and intrusive rocks from the stratigraphic units immediately below. These small-volume volcanoes represent two of the less silicic volcanoes (~54 wt.% SiO₂) in the northern Chilean Pleistocene to Holocene volcanic provinces. They are characterized by a fine grain size (mainly fine lapilli), olivine phenocrysts with skeletal textures, ignimbritic, dioritic, and granitic xenoliths, and quartz xenocrysts, with high concentrations of incompatible trace elements and light rare earth elements. The general magmatic evolution of the Cerro Overo and La Albóndiga systems has been controlled by fast ascent (e.g., skeletal olivine phenocrysts) of mantle-derived magma associated with mixing, fractional crystallization, and a low degree of crustal assimilation during turbulent ascent processes. Such eruptions provide evidence that various factors play an essential role in the transition from explosive-effusive magmatic (Cerro Overo and La Albóndiga) to phreatomagmatic (Cerro Overo) volcanic eruption styles.

Cerro Overo maar和LaAlbóndiga熔岩穹顶是两个独立的单基因火山，位于智利北部安第斯山脉的中央火山区，靠近活跃的Lascar和Chiliques火山。Cerro Overo maar形成于<77 ka年前，是由爆炸性喷发形成的，包括发岩活动。而LaAlbóndiga熔岩穹顶（更新世）仅是岩浆爆炸性活动的结果。Cerro Overo和LaAlbóndiga的特征是由火山碎屑岩和稠密的熔岩块组成的沉积物。在Cerro Overo，这些沉积物位于火山口边缘，而在LaAlbóndiga，它们形成了连贯的原位熔岩穹顶特征。Cerro Overo还显示出薄薄的以灰烬和青金石为主的沉积物层，推测是火山碎屑涌浪沉积物，其中包括显示花椰菜质地的幼年火成虫，无数奇特的意外石器以及弹道运送的lapilli，炸弹，方块和炸弹下陷。这些碎片包括回收的，青少年的火山碎屑，以及来自紧挨其下的地层单元的较老的火山岩和侵入岩的物质。这些小体积火山代表了两个硅含量较低的火山（〜54 wt。％SiO_2个）在智​​利北部的更新世至全新世的火山省。它们的特征是晶粒细小（主要是细的lapilli），具有骨骼质地的橄榄石型隐晶岩，火成岩，闪长岩和花岗石异质岩，以及石英异色岩，其中含有大量不相容的痕量元素和轻稀土元素。Cerro Overo和LaAlbóndiga系统的一般岩浆演化已受到地幔源岩浆的快速上升（例如骨骼橄榄石现象）的控制，该上升与地幔混合，分数结晶以及湍流上升过程中地壳同化程度低有关。此类喷发提供了证据，表明各种因素在从爆炸性喷发岩浆（塞罗欧沃和拉阿尔邦迪加）到发岩岩浆（塞罗欧沃）火山喷发方式的转变中起着至关重要的作用。