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Bulletin of Volcanology

, 76:849 | Cite as

The 3640–3510 BC rhyodacite eruption of Chachimbiro compound volcano, Ecuador: a violent directed blast produced by a satellite dome

  • Benjamin Bernard
  • Silvana Hidalgo
  • Claude Robin
  • Bernardo Beate
  • Jenny Quijozaca
Research Article

Abstract

Based on geochronological, petrological, stratigraphical, and sedimentological data, this paper describes the deposits left by the most powerful Holocene eruption of Chachimbiro compound volcano, in the northern part of Ecuador. The eruption, dated between 3640 and 3510 years BC, extruded a ∼650-m-wide and ∼225-m-high rhyodacite dome, located 6.3 km east of the central vent, that exploded and produced a large pyroclastic density current (PDC) directed to the southeast followed by a sub-Plinian eruptive column drifted by the wind to the west. The PDC deposit comprises two main layers. The lower layer (L1) is massive, typically coarse-grained and fines-depleted, with abundant dense juvenile fragments from the outgassed dome crust. The upper layer (L2) consists of stratified coarse ash and lapilli laminae, with juvenile clasts showing a wide density range (0.7–2.6 g cm−3). The thickness of the whole deposit ranges from few decimeters on the hills to several meters in the valleys. Deposits extending across six valleys perpendicular to the flow direction allowed us to determine a minimum velocity of 120 m s−1. These characteristics show striking similarities with deposits of high-energy turbulent stratified currents and in particular directed blasts. The explosion destroyed most of the dome built during the eruption. Subsequently, the sub-Plinian phase left a decimeter-thick accidental-fragment-rich pumice layer in the Chachimbiro highlands. Juvenile clasts, rhyodacitic in composition (SiO2 = 68.3 wt%), represent the most differentiated magma of Chachimbiro volcano. Magma processes occurred at two different depths (∼14.4 and 8.0 km). The hot (∼936 °C) deep reservoir fed the central vent while the shallow reservoir (∼858 °C) had an independent evolution, probably controlled by El Angel regional fault system. Such destructive eruptions, related to peripheral domes, are of critical importance for hazard assessment in large silicic volcanic complexes such as those forming the Frontal Volcanic Arc of Ecuador and Colombia.

Keywords

Chachimbiro Ryodacite Directed blast Satellite dome Physical volcanology Thermobarometry 

Notes

Acknowledgments

The sedimentological analysis (stratigraphy, grain-size distribution, and densitometry) of the PDC deposit has been funded with a Chancellor Grant of the Universidad San Francisco de Quito (P07AR71701USFQ2012-18). The 14C datings, geochemical, and petrographic analysis, as well as the fieldwork for this study have been funded by the Institut de Recherche pour le Développement in association with the Instituto Geofísico de la Escuela Politécnica Nacional. This research has been completed in the context of a Laboratoire Mixte International “Séismes et Volcans dans les Andes du Nord”. The authors thank Luc Ortlieb and the Laboratoire de Mesure du Carbone 14 for the 14C datings. The authors also thank Celine Liorzou from the Université de Bretagne Occidentale for the whole-rock chemical analysis and Jean-Luc Devidal from the Laboratoire Magmas et Volcans of Blaise Pascal University (Clermont II) for his kind help with the microprobe analysis. The authors acknowledge the participation of Marion Bécouze, Celia Guergouz, and Francisco Herrera to perform the fieldwork. Thorough reviews by J.-C. Komorowski, J.D.L. White, and an anonymous reviewer greatly helped us to improve this manuscript.

Supplementary material

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445_2014_849_MOESM2_ESM.xls (28 kb)
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ESM 3 (XLS 20 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Benjamin Bernard
    • 1
    • 2
    • 3
  • Silvana Hidalgo
    • 2
  • Claude Robin
    • 3
  • Bernardo Beate
    • 4
  • Jenny Quijozaca
    • 1
  1. 1.Universidad San Francisco de QuitoQuitoEcuador
  2. 2.Instituto Geofísico, Escuela Politécnica NacionalQuitoEcuador
  3. 3.Laboratoire Magmas et Volcans, Clermont UniversitéUniversité Blaise Pascal, CNRS-UMR 6524, IRD-R 163Clermont-FerrandFrance
  4. 4.Departamento de GeologíaEscuela Politécnica NacionalQuitoEcuador

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