Comportamento estrutural do Sistema Aquífero Guarani no estado de Goiás, Brasil

Abstract

In Goiás state, Brazil, the Guarani Aquifer System (SAG) is composed of eolian sandstones of Jurassic age of the Botucatu Formation that cover a large area of 44,000 km2, of this total, 35,138 km2 are confined by the basalts of Serra Geral Formation, while the 9,580 km2 remaining are outcrop areas. Based on data from surface geology and data from deep wells profiles was possible to establish the structural behavior of the SAG objective of this work. The outcrop areas are distributed to regions of Mineiros, Jatai and Aporé , with areas of 8,832, 705 and 42 km 2 respectively. The degree of confinement of the aquifer is controlled by two geological structures: a main, here called Tectonics Depression Associated with Paranaíba Lineament (TDPL), of NE-SW direction and it conditions the degree of confinement in a NW-SE and secondary structures are guidelines related to the tributaries of the Paranaíba river of NW-SE direction, which determine the degree of confinement in the direction W/E. The main tectonic events occurred in the Jurassic, which defined the limits of deposition and attitude of the sandstone layers and Cretaceous, magmatism of the Serra Geral Formation, which promoted the reactivation of basement faults and the installation of an intracontinental rift of NE-SW direction, which coincides with the scope TDPL (northeastern extension of the Paraná River lineament). The fissural magmatism that followed the installation of the rift severed locally pre-cretaceous sedimentary layers.