0°32′S 78°00′W / 0.53°S 78°W / -0.53; -78

Aliso, also known as Pan de Azúcar, is a 3,482-metre-high (11,424 ft) volcano in the Ecuadorian Andes to the east of Antisana volcano. The complex contains a semicircular western ridge and lava domes. The volcano has erupted rhyolites and dacites and some andesitic lava flows on a ridge above Baeza. It is covered with tundra and cloud forests. At least two eruptions of Pumayacu occurred during the Holocene; one dated 4400 years ago and another's lapilli deposits overlie a cultural horizon 2000 years old.[1] Older eruptions have been dated at 1.15 ± 0.07 Ma and are of high-potassium types. They compromise typical arc-derived lavas with fractional crystallization and other differentiation processes.[2]

References

  1. ^ "Aliso". Global Volcanism Program. Smithsonian Institution. 19 July 2015.
  2. ^ Le Voyer, Marion; Rose-Koga, Estelle F.; Laubier, Muriel; Schiano, Pierre (2008). "Petrogenesis of arc lavas from the Rucu Pichincha and Pan de Azucar volcanoes (Ecuadorian arc): Major, trace element, and boron isotope evidences from olivine-hosted melt inclusions". Geochemistry, Geophysics, Geosystems. 9 (12): n/a. Bibcode:2008GGG.....912027L. doi:10.1029/2008GC002173. ISSN 1525-2027.
source: http://en.wikipedia.org/wiki/Aliso_(volcano)