Relación de aguas superficiales y subterráneas en el área del lago Chungará y lagunas de Cotacotani, norte de Chile: Un estudio isotópico

Translated title of the contribution: Relation of surface and underground waters in Chungará and Cotacotani lake districts, northern Chile: An isotopic study

Christian Herrera, Juan José Pueyo, Alberto Sáez, Blas L. Valero-Garcés

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Lake Chungará and Cotacotani lake districts are surface water bodies located to the northwest of Lauca Basin in the northern Chilean Altiplano. Surface and underground waters show low to moderate saline content and an electrical conductivity in the range of 48.7 to 3090 μS/ cm. The lakes are related to a system of aquifers on the nearby volcano flanks and debris avalanche deposits of Parinacota volcano. On the basis of δ18O and δD isotopic composition and its correlation with the chloride content in Chungará and Cotacotani lake, spring, and Chungará river waters it is demonstrated that: a. Lake Chungará's waters show vertical and horizontal homogeneous isotopic composition, which indicates a good mixture of waters in the lake; b. an important part of the Cotacotani lake recharge feeding come from Lake Chungará, that flows laterally as groundwater; c. the groundwater that feeds the springs of the area has its main recharge in the spring-summer (October-March) precipitation. The high content of tritium (3H) measured in spring waters of the area suggested a very recent recharge (last decades) of the aquifer system. The application of lumped parameter models to interpret the water residence time in the aquifer indicates that the piston flow model shows the best fit to the isotopic composition of Chungará-Cotacotani groundwater.

Translated title of the contributionRelation of surface and underground waters in Chungará and Cotacotani lake districts, northern Chile: An isotopic study
Original languageSpanish
Pages (from-to)299-325
Number of pages27
JournalRevista Geologica de Chile
Volume33
Issue number2
DOIs
StatePublished - Jul 2006

Bibliographical note

Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

Keywords

  • Chile
  • Cotacotani Lakes
  • Groundwater
  • Lake Chungará
  • Recharge
  • Stable Isotopes
  • Tritium

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