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The conical, glacier-clad Nevado de Longaví volcano is a late-Pleistocene to Holocene, dominantly andesitic stratovolcano constructed over a basement of Tertiary volcaniclastic and granitic rocks. Two edifice-collapse events modified the eastern and SW flank of a pre-Holocene volcano, and Holocene activity has been concentrated at the summit region and on the eastern flanks of the volcano. Andesitic-to-dacitic lava domes occupy the summit region, and a Holocene dome forms the 3242-m-high summit of Longaví. The last eruptions produced a lava dome in the upper part of the collapse scarp and summit region that partially collapsed to the east, forming block-and-ash flow deposits. No historical eruptions are known, although fumarolic activity continues.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|4890 BCE ± 75 years||Unknown||Confirmed||Radiocarbon (uncorrected)|
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|Lonquen, Nevado de | Longuen, Nevado de|
|The conical, glacier-clad Nevado de Longaví volcano is seen from the SE. In the foreground is a Holocene block-and-ash flow deposit. This late-Pleistocene to Holocene andesitic stratovolcano was constructed over a basement of sedimentary and granitic rocks. A small lava dome forms the 3242-m-high summit of Longaví. No historical eruptions are known, although fumarolic activity continues.
Photo by José Naranjo, 2001 (Servico Nacional de Geologica y Mineria).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.
Hildreth W, Moorbath S, 1988. Crustal contribution to arc magmatism in the Andes of central Chile. Contr Mineral Petr, 98: 455-489.
IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..
Moreno H, 1974. Airplane flight over active volcanoes of central-south Chile. Internatl Symp Volc Andean & Antarctic Volc Problems Guidebook, Excur D-3, 56 p.
Moreno H, Naranjo J A, 1991. The southern Andes volcanoes (33°-41° 30' S), Chile. 6th Geol Cong Chile, Excur PC-3, 26 p.
Selles D, Rodriguez A C, Dungan M A, Naranjo J A, Gardeweg M, 2004. Geochemistry of Nevado de Longavi volcano (36.2° S): a compositionally atypical arc volcano in the Southern Volcanic Zone of the Andes. Rev Geol Chile, 31: 293-315.