"Lautaro is the northernmost of five volcanoes comprising the Australandean volcanic zone of the southernmost Chilean Andes and is the closest volcano to the Chile Triple Junction plate boundary. Volcanoes of the Australandean volcanic zone originated from subduction of the Antarctic plate beneath the South American plate. The Catalog of Active Volcanoes of the World synonyms for Lautaro (Cerro PirĂ¡mide, Chalten, and Chaltel) are actually synonyms of the dramatic Patagonian granitic peak of Cerro Fitz Roy (Moreno 1985, pers. comm.). Glacier-covered, 3607-m-high Lautaro volcano, the highest Chilean volcano below 40 degrees south, rises above the Southern Patagonian Ice Field. It has a crater just below its summit on the NW side, and a 1-km-wide crater is located on the NE flank. Ash deposits from eruptions of this dominantly dacitic volcano were visible on aerial photos taken during several occasions during the 20th century, and older ash layers form prominent markers on outflow glaciers of the Patagonian icecap."  -Smithsonian Volcano Archive
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