Chillahuita is a

dacitic Dacite () is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained (aphanitic) to porphyritic texture and is intermediate in composition between andesite and rhyol ...

lava dome in northern

Chile Chile, officially the Republic of Chile, is a country in the western part of South America. It is the southernmost country in the world, and the closest to Antarctica, occupying a long and narrow strip of land between the Andes to the east a ...

. It may have formed after the

Pleistocene The Pleistocene ( , often referred to as the ''Ice age'') is the geological epoch that lasted from about 2,580,000 to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in ...

, although argon-argon dating on amphibole has indicated an age of 370,000 ±40,000 years. It has an altitude of about . It formed in a single non- explosive eruption. The flow moved northward and eastward from the vent over a terrain with slopes of 3-4°. The flow has a surface area of with a flat circular surface containing flow folds. Steep high flanks limit the flow, which has a total volume of . It is surrounded by a

pumice Pumice (), called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular v ...

deposit probably from the San Pedro volcano to the northwest. The eruption of the Chillahuita dome appears to have been controlled by local fault systems associated with the Altiplano-Puna volcanic complex, which also has geochemical similarity with Chillahuita lavas.

References

External links

*{{cite web, title=Chillahuita, url=http://volcano.oregonstate.edu/oldroot/CVZ/chillahuita/index.html, website=Volcano World, publisher=

Oregon State University Oregon State University (OSU) is a public land-grant, research university in Corvallis, Oregon. OSU offers more than 200 undergraduate-degree programs along with a variety of graduate and doctoral degrees. It has the 10th largest engineering c ...

, accessdate=19 November 2015 Volcanoes of Antofagasta Region Pleistocene lava domes

See also

References

External links