Produção Nacional
Hidrogeoquímica e índice de saturação dos minerais no sistema aqüífero do Alto Cristalino de Salvador, Bahia
2009; Sociedade Brasileira de Geologia; Volume: 39; Issue: 2 Linguagem: Inglês
10.5327/rbg.v39i2.1454
ISSN2317-4889
AutoresSérgio Augusto de Morais Nascimento, Johildo Salomão Figueirêdo Barbosa, Manoel Jerônimo Moreira Cruz, Cristiane Maciel de Lima,
Tópico(s)Groundwater and Watershed Analysis
ResumoThe high crystalline of Salvador-Bahia is in its subsoil metamorfic and fractured crystalline rocks, covered by a thick mantle Regolithic and the Barreiras Formation, an aquifer is confined, heterogeneous and anisotropic, mixed and interdependent, such fissural and intergranular. Groundwater of coverage are usually sodium chloride while the deeper located in the basement crystalline fissural bicarbonated are sodium and calcium-magnesium. All are fresh water with low salt content, mainly sodium and chloride, due to the influence of marine aerosols. The aragonite carbonates, calcite and dolomite are found in supersaturated waters the crystalline basement, while the rates of saturation gibsita give positive coverage in the regolith. The hematite and goethite were in supersaturated both in terms of coverage in the basement fissural producing iron fouling in wells drilled in these two environments when geochemistry water. The manganese is very common in groundwater in the region, occurring in the form of dissolved Mn2+ and subsaturated both in terms of coverage as the crystalline aquifer fissural, no, so ability to precipitate in the form of pirolusite and manganite.
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