RESULTADOS COMPARADOS DE UMA CAMPANHA DE PROSPECÇÃO GEOFÍSICA COMPLETA NA PLANÍCIE DA VARGEM. ÁGUAS DA PRATA, SP

A. DAVINO, P. TALTASSE

Resumo


The Vargem plain, located in the right bank of the Quartéis river, near Águas da Prata town in the State of São Paulo, corresponds to a structural graben emplaced in the crystalline basement, of Pre-Cambrian age. It is filled up with Fluvial deposits. It is not more than a marginal accident as it occurs frequently on the board of the volcanic complexes. This alluvional valley contains a water-table fed by small irrigation channels derived from the Quarteis river. In order to evaluate with maximum accuracy the importance of the phreatic water reserves the determination of the depth and the contact shape between alluvions and crystalline rocks needed the application of the three classical geophysical methods: resistivity, seismic and magnetometry. Each one of these methods gave informations of the geometry of the geological contact and of the local nature of the basement rocks. According to informations collected at the shallow wells located in this plain, il appears that, from the point or view of the geometry of the geological contact, the seismic method shows the best results.

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