(Muñoz 1894, p. 51) Ojos de Maricunga is part of the Maricunga Belt, a volcanic area of Oligocene to Pliocene age consisting of lava domes and stratovolcanoes(Lohmeier et al. 2019, p. 375) that developed just south of the present-day Central Volcanic Zone of the Andes and is associated with metal ore deposits(Lohmeier et al. 2019, p. 374).
Other volcanoes active at that time were Cadillal, Dona Ines, north Jotabeche, La Laguna, Pastillitos, Santa Rosa and Villalobos.
(Mpodozis et al. 1995, p. 278) Ojos de Maricunga is 4,985 metres (16,355 ft) high and has a circumference of 15 kilometres (9.3 mi).
A northwest-southeast elongated, roughly 4 kilometres (2.5 mi) long crater or caldera caps off the edifice (Mpodozis et al. 1995, pp. 279–280).
There appear to be at least two ignimbrites whose composition and age resembles that of Ojos de Maricunga and neighbouring volcanoes (Kay et al. 1994, p. 1087).
The Laguna Santa Rosa lies southeast of Ojos de Maricunga and the west flowing Quebrada Paipate originates on the volcano's southern slope (Mpodozis et al. 1995, pp. 279–280).