Not available.

Não disponível.This thesis concerns with the elaboration of the Bouguer Gravity Chart in a 23 1/2 square degrees located in the central-meridional region of Brazil. The major units evolved in the area are the NE part of the Paraná Basin, a small part of the SE border of São Francisco cratonic area and the remaining crystalline basement, including the Central Transbrazilian Arch. It covers also part of the Brazilian Geodynamic Project\'s area. Some tectonic structures as like the Goiania flexure and larg fault zones could be delimitated and finally some light has been added to the history of the tectonic evolution of the área

Not available.

Não disponível.This thesis concerns with the elaboration of the Bouguer Gravity Chart in a 23 1/2 square degrees located in the central-meridional region of Brazil. The major units evolved in the area are the NE part of the Paraná Basin, a small part of the SE border of São Francisco cratonic area and the remaining crystalline basement, including the Central Transbrazilian Arch. It covers also part of the Brazilian Geodynamic Project\'s area. Some tectonic structures as like the Goiania flexure and larg fault zones could be delimitated and finally some light has been added to the history of the tectonic evolution of the área

Megaestruturacao pre-cambriana do territorio brasileiro baseada em dados geofisicos e geologicos

Crustal discontinuities may be seen as A-type collision sutures with triple junction arrays. Shear belts developed at the block borders due to oblique plate convergence. A consistent litho-structural zoning may be observed along the border zones of the blocks: the known high-grade terrains are exposed along the upper block border and pass to distal granite-greenstone terrains; in the lower block, granite-greenstone terrains form the older basement, and supracrustals occur as a metavolcano-sedimentary belt near or adjacent to the suture. This regional litho-structural framework may be related to diachronous collisions of sialic masses which lead to their amalgamation into an extensive continental mass. -from English summar

Estrutura em quilha Brasil central, uma feicao fundamental na geologia de Goias e Tocantins

The older Precambrian geological setting of north Goias/south Tocantins includes three areas of granite-greenstone terrains formed of medium-grade gneisses with associated greenstone belts and nepheline syenitic gneisses, separated by two orogenic belts composing a crustal-scale pop-up structure. The movements were firstly oblique towards NW along the northwestern NNE-SSW-trending Porto Nacional suture, and afterwards of essentially frontal type towards ESE along the southeastern Ceres suture of curved geometry with N-S direction at north and WNW-ESE at the south. The Porangatu block, limited by these sutures, was upthrusted over the neighbouring underthrusted blocks. Three principal kinematic phases are recognized along the orogenic belts. -from English summar