Английская Википедия:Cerro Escorial
Шаблон:Short description Шаблон:Infobox mountain
Cerro Escorial is a stratovolcano at the border of Argentina and Chile. It is part of the Corrida de Cori volcanic group and its youngest member. A well-preserved Шаблон:Convert crater forms its summit area. Lava flows are found on the Chilean and smaller ones on the Argentinian side, the former reaching as far as Шаблон:Convert from the volcano. One of these is dated 342,000 years ago by argon-argon dating.[1]
Off the western coast of South America, the Nazca Plate subducts beneath the South America Plate. This process has given rise to the Andes mountain chain and the Altiplano-Puna high plateau, which formed through shortening of the crust that lasted until 1 million years ago. Cerro Escorial rises from the Puna, which is dissected at Cerro Escorial by the Archibarca lineament; it is a strike-slip fault that has facilitated the ascent of magma.[2]
Andesite lavas were erupted during the Miocene and Pliocene.[2] Hydrothermal alteration has affected an area Шаблон:Convert from the crater.[3] A Plinian eruption on Escorial was the source of the dacitic Escorial ignimbrite,[4][5] which is also known as the Corrida de Cori ignimbrite or Caletones Cori ignimbrite.[2] Pulsed changes in the magma supply during the eruption generated a radial ignimbrite structure which was deposited in various flows. The source magma underwent significant crustal contamination and contains quartz veins, indicating that the ignimbrite interacted with a buried hydrothermal system.[5] Lithic clasts including basement material are also present. The ignimbrite has a volume of about Шаблон:Convert and was erupted 460,000±10,000 years ago.[4] The eruption of the ignimbrite was followed by more lava eruptions and the formation of a Holocene cinder cone. Present-day activity is of hydrothermal nature[2] and the absence of infrastructure and human population in the region mean that renewed activity is unlikely to have an impact.[3] It is considered to be Argentina's 28th most dangerous volcano.[6]
A sulfur mine lies Шаблон:Convert southwest of Escorial.[1] Mining ceased about 1983.[4]
See also
Sources
Шаблон:Salta-geo-stub
Шаблон:Antofagasta-geo-stub
Шаблон:Argentina-mountain-stub
Шаблон:Chile-mountain-stub
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
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<ref>; для сносокRichards2003не указан текст - ↑ 5,0 5,1 Ошибка цитирования Неверный тег
<ref>; для сносокRichardsVilleneuve2002не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокGarciaBadi2021не указан текст
- Английская Википедия
- Volcanoes of Antofagasta Region
- Volcanoes of Salta Province
- Stratovolcanoes of Chile
- Subduction volcanoes
- Polygenetic volcanoes
- Argentina–Chile border
- International mountains of South America
- Mountains of Antofagasta Region
- Mountains of Salta Province
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