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Samaniego Eguiguren, Pablo
Valderrama Murillo, Patricio Alonso
Mariño Salazar, Jersy
Van Wyk de Vries, Benjamin
Roche, Olivier
Manrique Llerena, Nélida
Chédeville, Corentin
Liorzou, Céline
Fídel Smoll, Lionel
Malnati, Judicaëlle
Samaniego, P.; Valderrama, P.; Mariño, J.; van Wyk de Vries, B.; Roche, O.; Manrique, N.; Liorzou, C.; Fídel, L.; & Malnati, J. (2015) - The historical (218 ± 14 aBP) explosive eruption of Tutupaca volcano (Southern Peru). Bulletin of Volcanology, 77(6), 1–18. Doi: 10.1007/s00445-015-0937-8
The little known Tutupaca volcano (17° 01' S, 70° 21' W), located at the southern end of the Peruvian arc, is a dacitic dome complex that experienced a large explosive eruption during historical times. Based on historic chronicles and our radiometric data, this eruption occurred 218¿±¿14 aBP, probably between 1787 and 1802 AD. This eruption was characterised by a large sector collapse that triggered a small debris avalanche (<1 km3) and an associated pyroclastic eruption whose bulk volume was 6.5–7.5¿×¿107 m3. Both units were emplaced synchronously and spread onto the plain situated to the northeast of Tutupaca volcano. The spatial and temporal relationship between the debris avalanche and the pyroclastic density current deposits, coupled with the petrological similarity between the juvenile fragments in the debris avalanche, the pyroclastic density current deposits and the pre-avalanche domes, indicates that juvenile magma was involved in the sector collapse. Large amounts of hydrothermally altered material are also found in the avalanche deposit. Thus, the ascent of a dacitic magma, coupled with the fact that the Tutupaca dome complex was constructed on top of an older, altered volcanic sequence, probably induced the destabilisation of the hydrothermally active edifice, producing the debris avalanche and its related pyroclastic density currents. This eruption probably represents the youngest debris avalanche in the Andes and was accompanied by one of the larger explosive events to have occurred in Southern Peru during historical times.
Springer Berlin Heidelberg
Bulletin of Volcanology, v. 77, n. 6, pp. 1–18, 2015
Instituto Geológico, Minero y Metalúrgico – INGEMMET
Repositorio Institucional INGEMMET
Avalancha volcánica
Erupciones volcánicas
Rocas volcánicas
The historical (218±14 aBP) explosive eruption of Tutupaca volcano (Southern Peru)
Bulletin of Volcanology
Peer reviewed

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