 Mafic inclusions occur in some eruption products.The basement of the region is formed by various formations of Precambrian to Tertiary age, some of which crop out around the volcano.This basement is cut by various faults, which mark an uplift that forms the Creston Alto de La Aguada east of Chimpa volcano, as well as the Calama-Olacapato-El Toro lineament and associated faults which runs south of the Chimpa volcano and has localized the formation of volcanoes along its path and also influenced the activity of Chimpa.