Chillahuita
Chillahuita is a dacitic lava dome in northern Chile. It may have formed after the Pleistocene, although argon-argon dating on amphibole has indicated an age of 370,000 ±40,000 years. It has an altitude of about. It formed in a single non-explosive eruption.
The flow moved northward and eastward from the vent over a terrain with slopes of 3-4°. The flow has a surface area of with a flat circular surface containing flow folds. Steep high flanks limit the flow, which has a total volume of. It is surrounded by a pumice deposit probably from the San Pedro volcano to the northwest.
The eruption of the Chillahuita dome appears to have been controlled by local fault systems associated with the Altiplano-Puna volcanic complex, which also has geochemical similarity with Chillahuita lavas.
