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Chillahuita
Dacitic lava dome in northern Chile From Wikipedia, the free encyclopedia
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Chillahuita is a dacitic lava dome in northern Chile. It may have formed after the Pleistocene,[2] although argon-argon dating on amphibole has indicated an age of 370,000 ± 40,000 years;[3] another age estimate is 107,800 ± 6,400 years.[4] It has an altitude of about 4,750 metres (15,580 ft). It formed in a single non-explosive eruption.[5]
The flow moved northward and eastward from the vent over a terrain with slopes of 3-4°. The flow has a surface area of 11 square kilometres (4.2 sq mi) with a flat circular surface containing flow folds. Steep 200-metre (660 ft) high flanks limit the flow, which has a total volume of 4 cubic kilometres (0.96 cu mi). It is surrounded by a pumice deposit probably from the San Pedro volcano to the northwest.[5]
The eruption of the Chillahuita dome involved the entry of andesitic magma into a pre-existent shallow reservoir.[4] It appears to have been controlled by local fault systems associated with the Altiplano-Puna volcanic complex, which also has geochemical similarity with Chillahuita lavas.[5]
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