Caracterização magnetométrica da região limítrofe cráton e faixa móvel - exemplo da borda ocidental do cráton São Francisco

Abstract

This paper presents the direct and inverse modeling of two airborne magnetic data profiles in South-Central part of Brasilia Belt, between the cratonic and external domains. The profiles have E-W direction and are localized between Paracatu an João Pinheiro cities. One of them follows the seismic line of 240-292 segment (Paracatu line) and the other one passes by the Morro Agudo deposit. The objectives of the profile modeling were to assist the interpretation of some seismic features observed in the Paracatu line, estimate the geometry and depth of the crystalline basement and to model the shallow magnetic bodies. The magnetic models showed good consistency with the results of seismic line and provide important information about the crystalline basement and the shallow magnetic sources. Although gravimetric data were not used in the modeling process, its analysis suggests a negative value of mass density contrast between the crystalline basement and sediments.