1997
DOI: 10.1017/s0033822200040893
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Characterization of Groundwater in the Cariri (Ceará, Brazil) By Environmental Isotopes and Electric Conductivity

Abstract: The Cariri region is the largest sedimentary basin in the state of Ceará, Brazil. Located in the southern portion of the state, it comprises the Araripe Plateau and the Cariri Valley on its northern foot. The region's groundwaters are being heavily exploited. Using electric conductivity (EC) and 18O, 14C and 3H data, we differentiate groundwaters from various origins. We identified three horizons of springs on the slope of the Plateau through their geologic environment and the EC of their waters. Groundwaters … Show more

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Cited by 11 publications
(5 citation statements)
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“…Aquifers on the top of the Araripe Plateau are composed of low-solubility minerals with great resistance to weathering. As their hydraulic conductivity is high, this promotes the rapid passage of Plateau recharge through the SAS, reaching the Santana Formation with a conductivity of 40 mS/cm (Santiago et al 1997). The dominant species are Na + and Cl À , probably originating from marine aerosol.…”
Section: Hydrogeochemical Inversionmentioning
confidence: 99%
See 1 more Smart Citation
“…Aquifers on the top of the Araripe Plateau are composed of low-solubility minerals with great resistance to weathering. As their hydraulic conductivity is high, this promotes the rapid passage of Plateau recharge through the SAS, reaching the Santana Formation with a conductivity of 40 mS/cm (Santiago et al 1997). The dominant species are Na + and Cl À , probably originating from marine aerosol.…”
Section: Hydrogeochemical Inversionmentioning
confidence: 99%
“…This problem is rather controversial, as the superior aquifer system (Plateau) and the middle aquifer system are separated by the limestone Santana Formation, considered by many hydrogeologists (DNPM 1996) an aquiclude because its hydraulic conductivity is estimated to be on the order of 10 À10 m/s. However, based on isotope and hydrochemical characteristics of groundwater in the Valley, Santiago et al (1997) proposed a model in which rainfall waters on the Plateau percolate the sandstone formations Exu and Arajara (constituting the Superior Aquifer System (SAS)) and pass through fractures in the Santana Formation, reaching the Rio da Batateira Formation of the Middle Aquifer System (MAS) in the Cariri Valley. Aquifer functioning is an important matter in the Valley as it is a rapidly growing urban region exclusively supplied by groundwater.…”
Section: Introductionmentioning
confidence: 99%
“…Já as águas do Aquífero Missão Velha apresentam condutividades elétricas superiores, variando entre 300 e 600 mS.cm -1 , com 14 C entre 25 e 100 PCM e valores de δ 18 O entre -5,1‰ e -3,0‰. Os valores mais enriquecidos estariam associados a recarga direta pela precipitação, enquanto fluxos ascendentes de águas mais antigas, seriam responsáveis pelos valores mais empobrecidos (SANTIAGO et al 1997).…”
Section: Sistemas Aquíferos Sedimentares Daunclassified
“…Na base da sequência hidroestratigráfica, o Aquífero Mauriti é caracterizado pelo armazenamento de águas com condutividades elétricas variando entre 600 e 1000 mS.cm -1 , com 14 C entre 5 e 100 PCM e valores de δ 18 O entre -3,8‰ e -2,8‰. Os autores observam que, apesar das evidências de águas mais antigas e empobrecidas, todas as unidades apresentam evidências de recargas pela precipitação atual (SANTIAGO et al 1997).…”
Section: Sistemas Aquíferos Sedimentares Daunclassified
“…são dispostos em baterias, especialmente ao longo das zonas aluviais dos rios -Rio da Batateira (em Crato), Riacho dos Macacos (em Juazeiro do Norte), Rio Salamanca (em Barbalha) e Riacho dos Porcos (em Milagres)(SANTIAGO, 1997). Há muitos anos, a prestação dos serviços de abastecimento de água e esgotamento sanitário no município é realizada pela CAGECE, sendo que a água captada para esse fim, e que é proveniente do manancial subterrâneo, atualmente é obtida através de uma bateria de 48 poços tubulares, com vazões que variam de 20,0 m³/h a 236,0 m³/h, cuja disposição pontual pode ser vista na Figura 13.…”
unclassified