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A group of andesitic, columnar-jointed lava domes and pyroclastic cones up to 150 m high on Isla Cook mark the southernmost Holocene volcanoes of the Andes. The nearest Holocene volcanism occurs 400 km NW, at Monte Burney. The volcanoes, known as Volcán Cook or Volcán Fueguino, occupy a broad peninsula forming the SE end of Isla Cook. One of the cones, south of Bahía del Volcán, contains a 150-m-wide crater with a small lake. The lava domes and pyroclastic cones, possibly emplaced along N-S-trending faults, are unaffected by glacial erosion that scoured the underlying plutonic rocks. Passing navigators observed possible eruptive activity in the direction of Cook in 1712 and the eruption of incandescent ejecta in 1820.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|1820 Nov 25||1820 Nov 26 (in or after)||Confirmed||2||Historical Observations|
|[ 1712 Nov 26 ± 4 days ]||[ Unknown ]||Uncertain|
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.
|London, Isla | Fueguino, Volcán | Cook, Volcán|
|A young lava dome on Isla Cook is viewed from the east. This group of andesitic lava domes and pyroclastic cones, known as Volcán Feuguino or Volcán Cook, mark the southernmost Holocene volcanoes of the Andes. They occupy a broad peninsula forming the SE end of Isla Cook and are unaffected by glacial erosion that scoured the underlying plutonic rocks. Passing navigators observed possible eruptive activity in the direction of Cook in 1712 and the eruption of incandescent ejecta in 1820.
Photo by Scott Dreher, 2005 (University of Durham).
Gonzalez-Ferran O, 1995. Volcanes de Chile. Santiago: Instituto Geografico Militar, 635 p.
Martinic-B M, 1988. Actividad volcanica historica en la region de Magellenes. Rev Geol Chile, 15: 181-186.
Puig A, Herve M, Suarez M, Saunders A D, 1984. Calc-alkaline and alkaline Miocene and calc-alkaline recent volcanism in the southernmost Patagonian Cordillera, Chile. J Volc Geotherm Res, 21: 149-163.