Chillahuita
22°10′S 68°02′W / 22.167°S 68.033°W[1] 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] It has an altitude of about 4,750 metres (15,580 ft). It formed in a single non-explosive eruption.[1]
The flow moved north 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 metres (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.[1]
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.[1]
See also
References
- ^ a b c d de Silva, S. L.; Self, S.; Francis, P. W.; Drake, R. E.; Carlos, Ramirez R. (1994). "Effusive silicic volcanism in the Central Andes: The Chao dacite and other young lavas of the Altiplano-Puna Volcanic Complex". Journal of Geophysical Research. 99 (B9): 17805. doi:10.1029/94JB00652. Retrieved 19 November 2015.
- ^ Guest, J. E.; Sánchez R, J. (September 1969). "A large dacitic lava flow in northern Chile". Bulletin Volcanologique. 33 (3). Springer-Verlag: 778–790. doi:10.1007/BF02596749. ISSN 1432-0819. Retrieved 19 November 2015.
- ^ Polanco, Edmundo; Clavero, Jorge; Giavelli, Aldo. "Geología de la cadena volcánica Paniri-Toconce, Zona Volcánica Central, Altiplano de la Región de Antofagasta, Chile" (PDF). biblioserver.sernageomin (in Spanish). Santiago: SERNAGEOMIN. Archived from the original (PDF) on 19 November 2015. Retrieved 19 November 2015.
External links
"Chillahuita". Volcano World. Oregon State University. Retrieved 19 November 2015.