This research focuses on the digital integration of airborne gamma ray and Landsat TM data for geological mapping in the Pojuca Area, Carajás Mineral Province (Brazilian Amazon Region). The study area is related to Archean gneisses, metasediments and metavolcanics, and anorogenic granites with Middle Proterozoic age. The vegetation is typical of tropical upland rain forest. The integration of Landsat TM and gamma ray spectrometric data produces enhanced products which show the spatial relationships between terrain morphology and bedrock radioactivity, valuable indicators of lithological unit distribution, structures, rock types and hydrothermal metasomatism processes . Despite the low spatial resolution of the airborne gamma ray data, the gamma ray/Landsat TM products have provided a powerful investigative tool for geologic mapping in the area. Results of this research emphasize the importance of using digital integration based on orbital remote sensing and aerogeophysical data as a routine in systematic mapping in the Amazon Region, particularly for large areas where airborne geophysical data are available.
Digital integrated products; Landsat TM; Gamma ray; Carajás; Amazon region; Geologic remote sensing
