Aplicación de imágenes ASTER para la prospección y mapeo de pegmatitas ricas en cuarzo y granitoides asociados. Sierra de Comechingones, Córdoba.

DEMARTIS, MANUEL; PINOTTI, LUCIO; D'ERAMO, FERNANDO; CONIGLIO, JORGE; AGULLEIRO INSÚA, L.; PETRELLI, HUGO

Buenos Aires

Congreso; VIII Congreso de Mineralogía y Metalogenia; 2006

Quartz-rich pegmatitic bodies and associated granites of the southern Comechingones pegmatitic district were consistently discriminated by means of satellite multispectral remote sensing. The application of image processing techniques, specifically designed for mineral mapping to selected spectral bands of the Terra/ASTER multispectral sensor, resulted in a detailed map for the southern part of the district, located between 64º 47’ and 64º 59,5’ W, and between 32º 19’ and 32º 31’ S. The mapping was carried out through the analysis of the 90 m resolution thermal infrared (TIR) radiance bands. The application of a decorrelation stretch to the RGB 13, 12, 10 false color composite image was usefull to discriminate quartz-rich areas. Comparison between the results achieved through remote sensing with field data confirmed the accuracy of these techniques. This mapping technique also demonstates the utility of ASTER thermal bands in quartz-rich pegmatites and granitoids exploration.