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Salar Grande (caldera)

Coordinates: 26°00′S 68°40′W / 26.000°S 68.667°W / -26.000; -68.667[1]
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26°00′S 68°40′W / 26.000°S 68.667°W / -26.000; -68.667[1] Salar Grande is a caldera in Chile.

The region originally contained various rocks with ages ranging from Neoproterozoic to Triassic. Starting with the Oligocene, the Central Volcanic Zone was active and gave rise to calderas, lava domes, pyroclastic cones and stratovolcanoes.[1]

The Salar Grande caldera is located close to the border with Argentina, northeast of the Salar de Pedernales. The caldera has an elliptical form trending northwest-southeast,[1] with dimensions of 50 by 25 kilometres (31 mi × 16 mi).[2]

The ignimbrites erupted by Salar Grande crop out mainly east of the caldera. They are yellow, white and gray and embedded within Miocene basaltic andesite, andesite and dacite lavas.[1] Ages range from 12.07 ± 0.6 - 9.8 ± 0.8 million years ago.[2]

References

  1. ^ a b c d Ramírez, Naranjo & Suárez 2015, p. 677.
  2. ^ a b Ramírez, Naranjo & Suárez 2015, p. 678.

Sources

  • Ramírez, Cristián; Naranjo, José A.; Suárez, Marco (October 2015). "Circones accesorios de una ignimbrita miocena: Evidencias de basamento Paleozoico cubierto por rocas cenozoicas (26°S)" (PDF). SERNAGEOMIN (in Spanish). 14th Chilean Geological Congress. {{cite web}}: Invalid |ref=harv (help)
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