Nevado San Francisco

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Nevado San Francisco
Vegas de San Francisco.jpg
Highest point
Elevation 6,016 m (19,738 ft) [1]
Coordinates 26°55′S 68°15′W / 26.917°S 68.250°W / -26.917; -68.250
Geography
Location Argentina-Chile
Parent range Andes
Geology
Age of rock 1.34 - 1.32 million years ago
Mountain type Stratovolcano
Last eruption Unknown

Nevado San Francisco, or Cerro San Francisco (Spanish pronunciation: [sam fɾanˈsisko]), is a stratovolcano on the border between Argentina and Chile, located just southeast of San Francisco Pass. It is considered extinct and is one of the several 6,000 m (19,700 ft) peaks in the area, of which the chief is the Ojos del Salado.

The volcano is part of the Central Volcanic Zone of the Andes.[2] It is composed from andesite with the exception of basaltic cones and lava flows on the eastern side. These cones are part of the Peinado lineament and a sample was dated 200,000 years ago by argon chronology.[3]:74-75 They are noteworthy for their olivine phenocrysts.[2] One lava flow less than one million years old reaches a length of 11 kilometres (6.8 mi).[4] The western slopes contain dacitic lava domes.[5] On the summit lie two circle-shaped constructs, of Inca or Formative period ages.[3]:351, 432

References[edit]

  1. ^ Difrol
  2. ^ a b Kay, Suzanne Mahlburg; Mpodozis, Constantino; Gardeweg, Moyra (2014-01-01). "Magma sources and tectonic setting of Central Andean andesites (25.5–28°S) related to crustal thickening, forearc subduction erosion and delamination". Geological Society, London, Special Publications. 385 (1): 310. ISSN 0305-8719. doi:10.1144/SP385.11. 
  3. ^ a b Nevado de Incahuasi: The Archaeological Anatomy of a Sacred Mountain in the Andes. ProQuest. 2008. ISBN 978-1-109-06242-7. 
  4. ^ "Comunicación | Conicet". www.conicet.gov.ar (in Spanish). Retrieved 2017-07-07. 
  5. ^ Baker, P. E.; Gonzalez-Ferran, O.; Rex, D. C. (1987-02-01). "Geology and geochemistry of the Ojos del Salado volcanic region, Chile". Journal of the Geological Society. 144 (1): 89. ISSN 0016-7649. doi:10.1144/gsjgs.144.1.0085. 

See also[edit]

"San Francisco". Global Volcanism Program. Smithsonian Institution.