Nevado San Francisco
|Nevado San Francisco|
|Elevation||6,016 m (19,738 ft) |
|Age of rock||1.34 - 1.32 million years ago|
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. 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.:74-75 They are noteworthy for their olivine phenocrysts. One lava flow less than one million years old reaches a length of 11 kilometres (6.8 mi). The western slopes contain dacitic lava domes. On the summit lie two circle-shaped constructs, of Inca or Formative period ages.:351, 432
- Difrol Archived 2007-09-27 at the Wayback Machine.
- 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. doi:10.1144/SP385.11. ISSN 0305-8719.
- Nevado de Incahuasi: The Archaeological Anatomy of a Sacred Mountain in the Andes. ProQuest. 2008. ISBN 978-1-109-06242-7.
- "Comunicación | Conicet". www.conicet.gov.ar (in Spanish). Retrieved 2017-07-07.
- 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. doi:10.1144/gsjgs.144.1.0085. ISSN 0016-7649.
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