Characterization of the aquifers in the crystalline environment on the west plot of the Alto Tiete Basin. / Caracterização dos aqüíferos em meio cristalino da porção oeste da Bacia do Alto Tietê

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

An area of 1140 km2 in the Alto Tietê basin, downstream from the city of São Paulo, between UTM coordinates 7420/7382 km South and 298/328 km West, was studied in order to characterize the fissural aquifers of the region and correlate hydrogeological parameters with diverse other factors conditioning productivity. The area includes geological compartments made up of Precambrian supracrustal rocks of low to medium metamorphic grade, intruded by granitic suites. Upon these rocks, occur Tertiary sedimentary rocks of the São Paulo Basin and alluvial plains. This study involved geological compilation and integration, with analysis of geological maps as well as field work and analysis of fracture patterns (orientation, connectivity, density, distance and length), which were correlated with the production of the wells assessed in each lithology. A statistical analysis showed that, in general, there is no significant correlation between the parameters and productivity. Hydrogeological characterization of data from 317 wells based on parameters related to water production allowed the ordering of productivity as follows: Limestones >sediments >phyllites >micas-chists+quartzites, granites+gneisses. According to the geological contexts in the area, three hydrogeological systems are proposed: the Granitoid (granites and gneisses) aquifer system; the Metasedimentary (phyllites, mica-schists, quartzites and limestones) aquifer; and system the Sedimentary (argillaceons/arenaceous mudstones and sand/graved). These systems may be distinguished by their lithological associations, structural patterns, well productivitys and hydrochemical facies. Hydraulic parameters were appraised by means of the programs AQFIS3, AQTSOLVE and PUMPEST. The calculated transmissivibility (T) decreases as follows: quartzites >phyllites >mica-schists >granites >limestones >gneisses. The chemical analyses of 44 samples of water were evaluated using the relative parameters related to the anions F-, Cl-, Br-, NO3-, HPO4-, SO4- and HCO3- and the cations Na, Mg, K and Ca, as well as electrical conducti vity parameters total durablity pH, Eh, T, Silica and Dissolved Oxygen. The chemical characterization of the groundwaters of the area allowed the identification of three dominant facies: calcium bicarbonate; sodic potassic; and sulfate chloreted. The interpretation of the hydrogeochemical modeling using the PHREEQE and NETPATH programs revealed that the water is undersaturated most of the time but sometimes oversaturated or in equilibrium with respect to minerals in the existing rocks.

ASSUNTO(S)

contaminação aquifers aqüíferos waterground contamination Água subterrânea

ACESSO AO ARTIGO

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