Samaniego Pablo auteur aut IRD Valderrama P. auteur aut IRD Marino J. auteur aut IRD de Vries B. V. auteur aut IRD Roche Olivier auteur aut IRD Manrique N. auteur aut IRD Chedeville C. auteur aut IRD Liorzou C. auteur aut IRD Fidel L. auteur aut IRD Malnati J. auteur aut IRD text journalArticle eng text/pdf born digital access The little known Tutupaca volcano (17 degrees 01' S, 70 degrees 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 km(3)) and an associated pyroclastic eruption whose bulk volume was 6.5-7.5x10(7) m(3). 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. specialized Tutupaca Peru Central Andes Explosive activity Sector collapse Volcanic hazards Historical activity PEROU ANDES 066 77 6 art. 51 [18 p.] 2015 0258-8900 https://www.documentation.ird.fr/hor/fdi:010064694 10.1007/s00445-015-0937-8 0258-8900 [F B010064694] https://www.documentation.ird.fr/hor/fdi:010064694 https://www.documentation.ird.fr/intranet/publi/2015/07/010064694.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2015-07-29 2017-08-23 fdi:010064694 fre