Emprego de sensoriamento remoto e gamaespectrometria na avaliação da mineralização fósforo-uranífera de Itataia-CE

Abstract

This project aimed to characterize the phosphorus-uranium of Itatiaia mineralization using gamma ray spectrometric data and optical remote sensing images. The phosphorus-uranium province is located in the municipality of Santa Quitéria-CE, central of the Ceará state, included in the Central Ceará Domain. The ore deposit is colophanite that occurs in different forms and is primarily associated with silicate and calcium marbles from Alcantil formation. Advances in techniques and software for processing and data availability has increased further the use of multi-source data integration techniques in mineral exploration. The OLI / Landsat 8 bands obtained from the website of USGS. The gamma ray spectrometric data Aerogeophysical North Ceará project were provided by the CPRM. Images generated by digital processing (PDI), allowed the enhancement of lithologies present in the study arca. The RGB 543 color composition appreciated the relief and structures in the region, since the colored composition with bands math 2/6, 2/4 and 5/7 in the red channel, green and blue, respectively, and showed the main lithologies the region, especially the marbles from Alcantil formation. The gamma ray spectrometric data were resampled to 125 meters, generating images for uranium, thorium and potassium channels, and total count. They were also generated due to ternary maps and images (RGB and CMY) with channels (K, U and Th). The anomaly associated with the deposit of Itatiaia is striking, characterized by high values for the channels of the total count, uranium and thorium. The_results obtained in PDI satellite images and processing of gamma ray spectrometric data were integrated into a GIS (Geographic Information System) and allow us to view the geological units and the body of mineralization.