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New age controls on the tephrochronology of the southernmost Andean Southern Volcanic Zone, Chile

Published online by Cambridge University Press:  05 September 2018

DJ Weller ,
ME de Porras ,
A Maldonado ,
C Méndez  and
CR Stern
DJ Weller*
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, Colorado80309-0399, USA
ME de Porras
Affiliation:
Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), CONICET, CCT Mendoza, Av. Ruiz Leal s/n, Mendoza, Argentina
A Maldonado
Affiliation:
Centro de Estudios Avanzados en Zonas Áridas (CEAZA), Instituto de Investigación Multidisciplinario en Ciencia y Tecnología, Universidad de La Serena, Avda. Raúl Bitrán 1305, La Serena, Chile Departamento de Biología Marina, Universidad Católica del Norte, Larrondo 1281, Coquimbo, Chile
C Méndez
Affiliation:
Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Moraleda 16, Coyhaique, Chile
CR Stern
Affiliation:
Department of Geological Sciences, University of Colorado, Boulder, Colorado80309-0399, USA
*
*Corresponding author at: Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309-0399, USA. E-mail address: derek.weller@colorado.edu (D.J. Weller).
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Abstract

The chronology of over 50 tephra layers preserved in a lake sediment core from Laguna La Trapananda (LLT) in the southern portion of the Andean Southern Volcanic Zone (SSVZ), Chile, is constrained by new radiocarbon age determinations, which span the period from late Pleistocene glacial retreat to the late Holocene. The tephra are correlative with tephra previously described from other lake cores in the region and are attributed to explosive eruptions of the SSVZ volcanoes Mentolat, Hudson, Macá, and potentially Cay. The new age determinations are used to estimate the ages of the >50 tephra in the LLT core, as well as those from the other previously described lake cores in the area, by a Bayesian statistical method. The results constrain the frequency of explosive eruptions of the volcanic centers in the southernmost SSVZ. They indicate that there was essentially no increase in the rate of eruptions from late-glacial to recent times due to deglaciation. They also provide isochrones used to constrain the depositional histories of the small lacustrine systems within which they were deposited and they provide a tephrochronologic tool for other paleoclimatic, paleoecologic, archaeologic and tephrochronologic studies in central Patagonia.

Keywords

volcanismtephratephrochronologyAndesPatagoniaChile
Type
Research Article
Information
Quaternary Research , Volume 91 , Issue 1 , January 2019 , pp. 250 - 264
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2018 

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References

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