Chato Aislado
25°59′S 68°49′W / 25.98°S 68.81°W[1] Chato Aislado is a volcano in Chile.
Chato Aislado is part of the High Andes of Chile, between 25° and 26°30′ degrees south. The Andes there at altitudes over 3,500 metres (11,500 ft) feature a number of volcanoes, as well as products of eruptive activity. The Salar Grande lies east of Chato Aislado. Chato Aislado has been proposed as a geosite location for Chile.[2]
Chato Aislado features a caldera formed by explosive activity.[2] This caldera has a diameter of 5 kilometres (3.1 mi). Ignimbrites with thicknesses of more than 179 metres (587 ft) are exposed in the caldera,[3] and crop out over a surface area of 105.04 square kilometres (40.56 sq mi). These ignimbrites are of dacitic composition, rich in crystals and pumice and display no welding.[1] A lava dome within the caldera reaches a height of 180 metres (590 ft), it shows traces of a collapse on its eastern flank.[3]
Chato Aislado is of Pleistocene age.[2] The ignimbrite has been dated 1.2 million years ago.[4] The caldera was formed within the ignimbrites erupted early in the volcano's history. The last activity generated the lava dome.[3]
References
- ^ a b Guzmán, Silvina; Grosse, Pablo; Montero-López, Carolina; Hongn, Fernando; Pilger, Rex; Petrinovic, Ivan; Seggiaro, Raúl; Aramayo, Alejandro (December 2014). "Spatial–temporal distribution of explosive volcanism in the 25–28°S segment of the Andean Central Volcanic Zone". Tectonophysics. 636: 176. doi:10.1016/j.tecto.2014.08.013.
- ^ a b c Villa 2015, p. 1.
- ^ a b c Villa 2015, p. 2.
- ^ Schnurr, W.B.W.; Trumbull, R.B.; Clavero, J.; Hahne, K.; Siebel, W.; Gardeweg, M. (September 2007). "Twenty-five million years of silicic volcanism in the southern central volcanic zone of the Andes: Geochemistry and magma genesis of ignimbrites from 25 to 27 °S, 67 to 72 °W". Journal of Volcanology and Geothermal Research. 166 (1): 21. doi:10.1016/j.jvolgeores.2007.06.005.
Sources
- Villa, Victor (October 2015). "Evaluación preliminar de geositios en la Alta Cordillera de Chile, entre los 25º y 26º S" (PDF). SERNAGEOMIN (in Spanish). La Serena, Chile: XIV Chilean Geological Congress. Archived from the original (PDF) on 10 January 2017. Retrieved 24 August 2016.
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