GRAVITY INVERSION ON GRANITE-GREENSTONE BELT AREAS: CRIXÁS, GUARINOS AND PILAR DE GOlÁS, BRAZIL

MARCELO DE LAWRENCE BASSAY BLUM, AUGUSTO CÉSAR BITTENCOURT PIRES, ROBERTO ALEXANDRE VITÓRIA DE MORAES

Resumo


A gravity survey was carried out in the central and northern state of Goías portions, covering an area of 9000 km2 of granitegreenstone belt rock associations. Using a fixed density of 2.67 g/cm3 and removing a second-degree trend surface for modeling and inversion, we determined the residual anomalies. Each anomaly was associated to well-known geological surface information, and airborne magnetic data, and density determinations. Final solution was obtained in by interactive inversion. The initial models were generated in 2-D, for latter 2.5-D inversion, interpretation and geological sections sketching based on geologic knowledge. The anomalies were also inverted in 3-D in an automatic process. Estimated depths are coherent with those obtained in the 2.5-D inversion, indicating the targets can reach 2 km deep.

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