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14C Analyses of Groundwater From the Botucatu Aquifer System in Brazil

Published online by Cambridge University Press:  18 July 2016

Annkarin Aurelia ,
Kimmelmann E Silva ,
Aldo da Cunha Rebouças ,
Maria Marlucia  and
Freitas Santiago
Annkarin Aurelia
Affiliation:
Universidade de São Paulo, Institute de Geociências, São Paulo, Brazil
Kimmelmann E Silva
Affiliation:
Universidade de São Paulo, Institute de Geociências, São Paulo, Brazil
Aldo da Cunha Rebouças
Affiliation:
Universidade de São Paulo, Institute de Geociências, São Paulo, Brazil
Maria Marlucia
Affiliation:
Universidade de São Paulo, Institute de Geociências, São Paulo, Brazil
Freitas Santiago
Affiliation:
Universidade de São Paulo, Institute de Geociências, São Paulo, Brazil
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Abstract

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Measurements of 14C activity as well as determinations of the stable isotope composition (18O, 2H and 13C) of groundwater samples were made to investigate the flow path, origin, recharge and age of the Botucatu Aquifer System in Brazil, between 1984 and 1987. The stable oxygen isotope composition reflects infiltration during several climatic recharge conditions. Measured 14C activities range from 0.4 to 94.2% modern. δ13C values enable us to distinguish two groundwater types of different origins. There is a gradual increase of 14C ages from the outcrop area towards the central part of the basin, associated with a progression of the confining conditions. Anomalous fluoride contents seem to be correlated with high 14C ages of the groundwater. The reliability of the 14C data is discussed.

Type
IV. Applications
Information
Radiocarbon , Volume 31 , Issue 3: June 20-25, 1988 Dubrovnik, Yugoslavia , 1989 , pp. 926 - 933
Copyright
Copyright © The American Journal of Science 

References

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