A porção NE do Granito Santo Ferreira e sua articulação com o embasamento a partir de dados aerogeofísicos e gravimétricos terrestres.

Abstract

In the Sul-rio-grandense Shield, there are several intrusive granite bodies referred to in the bibliography as related to the post-colisional stage, including Santo Ferreira Granite, the target of this study. The present work consists of identifying lithological heterogeneities, delinating structures, lateral and depth limits of the Santo Ferreira Granite from the integration of terrestrial aerogeophysical and gravimetric data. Gravimetric acquisition was performed over a three-kilometer profile, with a spacing of 50 meters between the 56 gravimetric stations acquired in total. Analyzing regional lineaments using GIS database, regional structures were observed in a preferred direction NW/SE and NE/SW, but magnetic anomaly maps have a preferred NE direction. This is due to the probable proximity of the Caçapava do Sul Suture that is located east of the study area. It was possible to conclude, from this study, that the profile performed NW-SE has two striking domains with different anomalous values for data from the anomaly Bouguer, Continuation Upwards (200 meters), Waste and 1st and 2nd Vertical Derivative. Therefore, a regional structure NE on sub surface sectioning the body is suggested and thus causing the intrusion of magmatic material into different pulses corroborated by the contrasting anomaly presented. Other values of the gravimetric anomalies presented are likely to correlate with the metamorphic rocks of the Passo Feio Metamorphic Complex.