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Polycyclic scoria cones of the Antofagasta de la Sierra basin, Southern Puna plateau, Argentina

By
Walter Báez
Walter Báez
Unidad de recursos geológicos y geotérmicos INENCO (UNSa – CONICET), Av. Bolivia 5150, A4400FVY Salta, Argentina
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Gerardo Carrasco Nuñez
Gerardo Carrasco Nuñez
Centro de Geociencias, UNAM Campus Juriquilla, Blvr. Juriquilla 3001 Querétaro, Qro. 72300 Mexico
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Guido Giordano
Guido Giordano
Department of Sciences, University Roma Tre, 00146 Rome, ItalyCNR-IDPA Institute for Dynamics of Environmental Processes, Via M. Bianco, 20131 Milan, Italy
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José G. Viramonte
José G. Viramonte
Unidad de recursos geológicos y geotérmicos INENCO (UNSa – CONICET), Av. Bolivia 5150, A4400FVY Salta, Argentina
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Agostina Chiodi
Agostina Chiodi
Unidad de recursos geológicos y geotérmicos INENCO (UNSa – CONICET), Av. Bolivia 5150, A4400FVY Salta, Argentina
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Published:
January 01, 2017

Abstract

Despite a number of published papers focusing on the geodynamic implications of the recent Southern Puna mafic magmatism, there have been fewer studies of the volcanology and stratigraphy of this outstanding volcanism. This paper presents a detailed map of two well-preserved Quaternary scoria cones showing their complex stratigraphy. Complementary morphometric, morpho-structural, petrographic and geochemical data were used to reconstruct the evolution of both volcanoes. The occurrence of more than one eruption at each volcano was inferred by the recognition of temporal hiatuses using morpho-stratigraphic criteria. The polycyclic nature of both scoria cones could be related to a combination of a high input magma in response to lithospheric delamination, a favourable regional stress field and the interaction of rising magma with pre-existing faults. The youngest eruptions in both volcanoes were complex, with shifts in the eruptive style from violent strombolian to hawaiian/strombolian phases, and probably lasted for a few years. The explosive activity was accompanied by the emission of lava flows from lateral vents. Phreatomagmatic activity was triggered during the waning stages of the eruptions. The occurrence of more than one eruption in a single scoria cone and the changes in the eruptive style during long-lasting eruptions are important topics for volcanic hazard assessment in the Southern Puna.

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Contents

Geological Society, London, Special Publications

Monogenetic Volcanism

K. Németh
K. Németh
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G. Carrasco-Núñez
G. Carrasco-Núñez
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J. J. Aranda-Gómez
J. J. Aranda-Gómez
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I. E. M. Smith
I. E. M. Smith
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The Geological Society of London
Volume
446
ISBN electronic:
978-1-78620-376-2
Publication date:
January 01, 2017

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