Skip to Main Content
Book Chapter

Neogene monogenetic volcanism from the Northern Puna region: products and eruptive styles

By
Guadalupe Maro
Guadalupe Maro
Instituto de Ecorregiones Andinas (INECOA), Universidad Nacional de Jujuy – CONICET, Instituto de Geología y Minería, Av. Bolivia 1661, San Salvador de Jujuy (CP 4600), Jujuy, Argentina
Search for other works by this author on:
Pablo J. Caffe
Pablo J. Caffe
Instituto de Ecorregiones Andinas (INECOA), Universidad Nacional de Jujuy – CONICET, Instituto de Geología y Minería, Av. Bolivia 1661, San Salvador de Jujuy (CP 4600), Jujuy, Argentina
Search for other works by this author on:
Published:
January 01, 2017

Abstract

The Neogene mafic volcanism of the Northern Puna region in the Central Andes is represented by scoria cones and lava flows dispersed over a wide region (c. 9150 km2) as isolated or poorly clustered centres. Although all the products are basaltic andesites to andesites, the behaviour of these magmatic systems resembles that seen in basaltic monogenetic fields. These centres were studied with the aim of defining the main volcanic lithofacies and evaluating the eruptive styles. The results suggest that the eruptions developed under a dry strombolian dynamic, with brief periods of lava fountaining and hydrovolcanism, the latter usually restricted to the early stages of cone construction. Changes in eruptive style are thought to be caused by variations in both the internal (e.g. magma ascent) and external (e.g. surficial water availability) conditions. The transitions do not reflect compositional changes, as evidenced by the small chemical differences observed among the products of the studied eruptive centres. Stratigraphic analysis, in addition to a few pre-existing radiometric dates, suggests that this volcanic activity occurred during the Late Miocene to Early Pliocene. This information supports the inference that these eruptions occurred before the peak of Southern Puna mafic volcanism and that they were coeval with eruptions of some of the most important silicic calderas of the Altiplano-Puna Volcanic Complex. The good preservation of volcanic edifices reveals that erosion rates were extremely low, in agreement with the high aridity conditions that have prevailed in the Puna region since the Mid- to Late Miocene.

You do not currently have access to this article.

Figures & Tables

Contents

Geological Society, London, Special Publications

Monogenetic Volcanism

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

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal