RELAÇÃO HIDRÁULICA ENTRE O COMPLEXO BELO HORIZONTE E O GRUPO BAMBUÍ NA PORÇÃO SUL DA APA CARSTE DE LAGOA SANTA, MG

Abstract

The hydraulic relation between Belo Horizonte complex and bambui group in the south portion of APA Carste de Lagoa Santa, mg. The area of this study is located north to the city of Belo Horizonte, Minas Gerais, has 432 km² and embrace the southern portion of the Federal Environmental Protection Area (APA) Carste de Lagoa Santa. The geology is characterized by the Belo Horizonte Complex in the basal portion, composed of granodiorites, granites and gneisses. Superimposed on this unit by tectonic contact, there are neoproterozoic rocks of the Bambuí Group, which from the bottom to the top are constituted by the Sete Lagoas Fm., composed of limestone, and the Serra de Santa Helena Fm., consisting of phyllites. Photointerpreted lineaments associated with structures measured in the field and hydraulic data from tubular wells were used to determine the underground flow between rocks from the Belo Horizonte Complex and from the Sete Lagoas Fm. From the specific capacity data, it was obtained that the NE direction is preferential for transferring water flow from the fractures of the crystalline rocks to the supracrustal rocks of the Bambuí Group, from where the flow preferably goes in the EW direction. However, the hydraulic productivity data collected show the productive ranges in the carbonate rocks are oriented preferentially in the N60-90E and N60-90W directions.

Keywords: Apa carste de lagoa santa, hidrogeology, wells productivity