Abstract
We have interpreted the Bouguer anomaly map from South Brazil and its adjoining oceanic areas, using the land data from the SAGP Project (1990), and the marine data derived from GEOSAT. With the aid of the vertical derivatives and the maximum horizontal gradientes of the Bouguer anomalies we have mapped the boundaries between the major lithospheric compartments, here characterized by their gravity signatures. Two dimensional gravity modelling with available geological constraints have also been performed aiming to estimate the crustal thicknesses within each individual compartment. We show that the gravity responses of the continental, transitional and oceanic lithospheres are well distinguished.
Highlights
Ao longo do século XX tem crescido a participação da Geofísica no estudo da Terra
the marinc data dcrh'cd from GEOSAT With the aid
Two dimensional gravity modelling with a"ailable gcological constraints have also becn performed aiming to estimate the cnIstalthicknesscs within each individual compartmcnl
Summary
Ao longo do século XX tem crescido a participação da Geofísica no estudo da Terra. Métodos físicos são utilizados no estudo da atmosfera, dos oceanos, dos rios, dos ventos, do interior da Terra, na ecologia, e também no estudo dos minerais e das rochas da crosta terrestre. A análise dos dados gravimétricos permite, por exemplo, a localização de estruturas geológicas em subsuperficie, o cálculo da profundidade de bacias sedimentares, o estudo isostático de uma área etc.
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