Análise morfométrica da bacia hidrográfica do ribeirão da Mata no contato embasamento arqueano e bacia sedimentar neoproterozoica, Minas Gerais

Abstract

The landforms are commonly conditioned by their geological framework, such as geotectonic contact zones that may reveal both morphostructural and morphotectonic aspects. This paper investigates the influences of the geological framework on the regional geomorphological evolution of the catchment area of the Ribeirão da Mata, an affluent basin of the Velhas river located in the northern vector of the metropolitan region of Belo Horizonte, Minas Gerais. This basin is located inthe transition between the archaean rocks of the Complex Belo Horizonte and the neoproterozoic sedimentary rocks of the Bambuí Group. The orientation of talvegues and interfluves, the surface roughness and the density of the stream network were analyzed. The results revealed a strong morphostructural control possibly associated to crustal movements capable of changing the base level and influencing surface dissection by the stream network.