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. Airborne geophysical data are an important tool for the interpretation of geological features. The variations observed in airborne magnetic and gamma-ray spectrometric data are typically used to differentiate geological units and delimit structures. In this context, this study aims to use gamma-ray spectrometric and magnetic airborne data to support the geological mapping in the Fazenda Nova region, located in the east portion of the Arenopolis Magmatic Arc. The processing of the gamma-ray spectrometric data consisted of generating K, U, Th, total count, gamma-ray spectrometric ratios and ternary images. The anomalous magnetic field processing and enhancing generated the magnetic maps, which provided information about the structural framework of the area, while the gamma-ray profiles and images allowed the delineation of the geologic-geophysical domains. Fifteen domains were individualized, interpreted especially from ternary images, which displayed a good relation with the granite bodies mapped and indicated different rocks associated with the Goias Alkaline Province, contributing to improving the geological knowledge of the area. Keywords : airborne geophysics, gamma-ray spectrometric, Arenopolis Magmatic Arc. RESUMO. Dados aerogeofisicos consistem em uma importante ferramenta para a interpretacao de feicoes geologicas. Variacoes observadas em dados magneticos e de espectrometria gama aereos sao usualmente utilizadas para a discriminacao de unidades geologicas e delimitacao de estruturas. Neste contexto, este estudo tem como objetivo o uso de imagens derivadas do processamento de dados magneticos e gamaespectrometricos aereos no suporte ao mapeamento geologico na regiao de Fazenda Nova, localizada na porcao leste do Arco Magmatico de Arenopolis. Para os dados gamaespectrometricos, o processamento consistiu na geracao de imagens dos canais K, U, Th e Contagem Total, alem das razoes entre os canais e as imagens ternarias. O processamento e realce do campo magnetico anomalo geraram as imagens magneticas, as quais forneceram informacoes sobre o arcabouco estrutural da area, enquanto que imagens e perfis aeroradiometricos permitiram a delimitacao dos dominios litogeofisicos. Foram individualizados 15 dominios, interpretados principalmente a partir das imagens ternarias, os quais apresentaram forte correlacao com os corpos graniticos mapeados na regiao e delimitaram diferentes rochas associadas a Provincia Alcalina de Goias, contribuindo para o aprimoramento do conhecimento geologico da regiao. Palavras-chave : aerogeofisica, gamaespectrometria, Arco Magmatico de Arenopolis.

AIRBORNE GAMMA-RAY SPECTROMETRIC AND MAGNETIC SIGNATURES OF FAZENDA NOVA REGION, EAST PORTION OF ARENÓPOLIS MAGMATIC ARC, GOIÁS