Magnetometria Terrestre do corpo kimberlítico Castelhana associada a estudos geológicos preliminares, Província Ígnea do Alto Paranaíba (PIAP), Monte Carmelo-MG

Abstract

The Castelhana body was discovered during prospecting campaigns carried out by foreign companies Sopemi and De Beers, in the region of Alto Paranaíba and Goiás, in 1970s and 1980s, being named at that time as kimberlite Perdizes 10. Located between Monte Carmelo and Romaria, Minas Gerais state, the kimberlite Perdizes 10 was named, in this present work, as Castelhana body, due to the homonymous farm where it is located. Geophysical studies carried out in the region allowed the making of corrected total magnetic field maps of the (IGRF), generated from aerial surveys, the presence of a magnetic dipole, masked by a regional anomaly was studied in this work in order to understand the magnetic signature in the regional and local context. The regional context was assessed using aeromagnetometry with data treated by LASA Prospecção S/A and made available by the Companhia de Desenvolvimento Econômico de Minas Gerais (CODEMIG), corresponding to Area 7. In turn, the local context was known based on the terrestrial magnetometry that allowed the positioning of the anomaly with a magnetic response verified in samples from survey cores made available by GAR Mineração, Comércio, Importação e Exportação S/A. The study made it possible to integrate preliminary geological and geophysical data from the literature as well as from research entities and mining companies, which supported the planning of terrestrial magnetometry within the limits of the Castelhana Magnetic Anomaly. The land survey carried out in partnership with the Observatório Nacional (ON), within the limits of the Castelhana body, showed an expressive magnetic response and signature consistent with the presence of a kimberlitic body which was verified by macroscopic petrographic studies as well as by the magnetic response highlighted on the map of the total magnetic intesity field (TMI) and analytical signal amplitude (ASA).