Fianco and 3 co-authors in 2012 that the project area is located in the central part of Brazil, on the northeast region of Goias State. The phosphatic rocks occur in the Bambu Group, on the eastern portion of the Faixa de Dobramentos Brasılia – Brasılia Fold Belt (FDB), on the western border of the Sao Francisco Craton. In the area under investigation, the mineralized rocks are associated with limestone and apatite. In order to discover new prospective targets of phosphatic sedimentary bodies, a faster and more objective airborne geophysics data processing method was carried out together with statistical correlation of geochemical data. The integration of these data identified potential mineralized targets to be checked with geologic mapping and ground geophysics (gamma-ray spectrometry) to produce a parameter of calibration and comparison with the airborne geophysical information.
Integration of geologic information and estimate maps of eU and P shows that igneous rocks and lateritic crusts present the highest grades of eU and eTh, as expected. However, short wavelength anomalies were identified in sediments of the Serra de Santa Helena and Sete Lagoas formations (Bambu Group), where known phosphatic bodies occur in the studied area. The next step of this work will be field work to check these anomalies, with geological mapping and ground gamma-ray profiles.
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