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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Geochemical evolution, residence times and recharge conditions of the multilayered Tubarao aquifer system (State of Sao Paulo - Brazil) as indicated by hydrochemical, stable isotope and C-14 data

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Author(s):
Ezaki, Sibele [1] ; Gastmans, Didier [2] ; Iritani, Mara Akie [1] ; dos Santos, Vinicius [2] ; Stradioto, Marcia Regina [3]
Total Authors: 5
Affiliation:
[1] Secretaria Infraestrutura & Meio Ambiente Estado, Inst Geol, Sao Paulo - Brazil
[2] Sao Paulo State Univ UNESP, Environm Studies Ctr, Rio Claro - Brazil
[3] Sao Paulo State Univ UNESP, Lab Basin Studies, Rio Claro - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES; v. 56, n. 5-6, SI, p. 495-512, NOV 1 2020.
Web of Science Citations: 2
Abstract

The Tubarao aquifer system constitutes a very complex, multilayered aquifer enclosed in the Parana basin (central-southern part of Brazil). Despite the relatively low productivity of wells, groundwater represents an important source of water for the very populated and industrialized zones of the State of Sao Paulo. An extensive water sampling campaign was carried out followed by hydrochemical and isotopic (delta H-2, delta O-18, delta C-13 and C-14) studies, aiming at a better understanding of the aquifer's geochemical evolution, recharge processes, and its groundwater residence times. Two main hydrochemical facies were recognized and divide the aquifer in two portions. The shallow portion - the active hydrological zone of the aquifer - is characterized by the Ca-HCO3 water type, evolving as a system open to atmospheric CO2. Mean residence times are typically lower than 5000 years. The lower portion is mostly characterized by the stagnant, Na-HCO3 water type, evolving under closed system conditions. Residence times average up to 15,000 years, but can reach 44,000 years, which indicates the exploitation of (possibly non-renewable) fossil waters. This study contributes to the establishment of proper policies regarding the sustainable groundwater exploitation of the Tubarao aquifer system. (AU)

FAPESP's process: 18/06666-4 - Isotopic tracers revealing the water movement in watersheds of the São Paulo State
Grantee:Didier Gastmans
Support Opportunities: Regular Research Grants