A importância litoestrutural na morfogênese nas bacias dos ribeirões Douradinho e Estiva, no Triângulo Mineiro

Abstract

The main objective of this thesis was to analyze the tectonic structure and relate to the morphology of the basin of Stream Douradinho and Stowage. This area is located in contact with Chapada relief dissected the Rio Tijuco basin, south of the city of Uberlândia. The literature review of the genesis and evolution of the Paraná Basin was important goal for inserted the search area in the larger context. Digital processing of morphometric data was one tool used to analyze the geometry of the shapes and analyze the behavior litoestrutural context. These data were obtained through field work, photogrammetry and remote sensing. Efforts during the Cretaceous-Tertiary caused the uplift of the Alto Paranaiba, tectonic feature responsible for moving old parallel fault zones to Suture Itumbiara and Flexura Goiania. The tectonic movement acted dismantling the deposits of the Bauru Group present in the area, generating structural depressions (Graben) Uberaba to south and east lifting the Chapada (Horst). It is considered that the regional paleogeographic heritage kept the faulting systems NE-SW and NW - SW reflecting distinct stress field in the reactivation of old systems. Thus, the effects of faulting systems in this area conditioned: a) the drainage patterns; b) the anomalies observed in major drainages; c) the regularity and spacing of the drainage channels; d) the regularity in the spacing of ways, either by possible uniformity of the rocks of the Bauru Group in the area, either by conditioning brittle failure; e) the large number of 1st order rivers; f) the asymmetry of the drainage channels; g) the alignment of gullies, h) NE catches in shorter segments in progress, or eminent and i) desenível topographic between the plateau and dissected relief of the Tijuco river basin.