SOBRE A IDADE DAS ÁGUAS SUBTERRÂNEAS NO POLÍGONO DAS SECAS DO NORDESTE BRASILEIRO

M. A GEYH, K. KREYSING

Resumo


Residence times and radiocarbon model ages were obtained on intensively mineralized ground waters of Northeast Brazil, by means of Cl4 and H13 analyses. The results show a close correlation between the geologic setting and ground water renowal. The older waters are found only on joint systems. For other situations the wells show reduced content of captation waters. Initial concentration or C14 vary hetween 75 and 100% modern, reflecting differences on the basement geology , which is composed by gneisses and mica schists. Residence times and total mineral content or the ground waters seem to bear a normal relationship.

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