Lonquimay Volcano is a stratovolcano

Stratovolcano

A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...

 of late-Pleistocene to dominantly Holocene age, with the shape of a truncated cone. The cone is largely andesitic

Andesite

Andesite is an extrusive igneous, volcanic rock, of intermediate composition, with aphanitic to porphyritic texture. In a general sense, it is the intermediate type between basalt and dacite. The mineral assemblage is typically dominated by plagioclase plus pyroxene and/or hornblende. Magnetite,...

, though basalt

Basalt

Basalt is a common extrusive volcanic rock. It is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet. It may be porphyritic containing larger crystals in a fine matrix, or vesicular, or frothy scoria. Unweathered basalt is black or grey...

ic and dacitic

Dacite

Dacite is an igneous, volcanic rock. It has an aphanitic to porphyritic texture and is intermediate in composition between andesite and rhyolite. The relative proportions of feldspars and quartz in dacite, and in many other volcanic rocks, are illustrated in the QAPF diagram...

 rocks are present. It is located in the Araucanía Region

Araucanía Region

The IX Araucanía Region is one of Chile's 15 first order administrative divisions and comprises two provinces: Malleco in the north and Cautín in the south....

 of Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

, immediately SE of Tolhuaca

Tolhuaca (volcano)

Tolhuaca Volcano is a stratovolcano located in the northern part of the Araucanía Region of Chile. The volcano has been shaped by glacial erosion, which contrasts with the relatively smooth slopes of its neighbor Lonquimay, due to the younger age of this latter volcano.The volcano dominates the...

 volcano. Sierra Nevada

Sierra Nevada (stratovolcano)

Sierra Nevada is a stratovolcano located in the Araucanía Region of Chile, near the Llaima volcano. Its last certain eruptions were in the Pleistocene period, but its activity may extend into the Holocene. Its primary lavas are andesitic and basaltic flows, although it has also produced pyroclastic...

 and Llaima

Llaima

Llaima Volcano is one of the largest and most active volcanoes in Chile. It is situated 82 km northeast of Temuco and 663 km southeast of Santiago, within the borders of Conguillío National Park.-Geography:...

 are their neighbors to the south. The snow-capped volcano lies within the protected area Malalcahuello-Nalcas

Malalcahuello-Nalcas

Malalcahuello-Nalcas is a protected area comprising two adjoining national reserves: Malalcahuello and Nalcas. It is located in the Andes, in the Araucanía Region of Chile and bordering the Bío-Bío Region....

.

The volcano last erupted in 1988, the eruption ending in 1990. The VEI

Volcanic Explosivity Index

The Volcanic Explosivity Index was devised by Chris Newhall of the U.S. Geological Survey and Stephen Self at the University of Hawaii in 1982 to provide a relative measure of the explosiveness of volcanic eruptions....

was 3. The eruption was from a flank vent and involved lava flows and explosive eruptions. There were fatalities.

External links

• The Lonquimay volcano