SENSORAMIENTO REMOTO Y MAGNETISMO APLICADO AL ESTUDIO DE TERRENOS PALEOZOICOS EN LA PRECORDILLERA ARGENTINA

ARIZA JUAN; M. P. MARTINEZ; VUJOVICH GRACIELA I; BOEDO FLORENCIA L; ALVAREZ ORLANDO; SANCHEZ MARCOS

Geoacta

Asociacion Argentina de Geofisicos y Geodestas

Lugar: Buenos Aires; Año: 2014 vol. 39 p. 138 - 153

1852-7744

Remote Sensing and magnetism applied to the differentiation of Palaeozoic terranes in the Argentine Precordillera. Supervised classifications provide excellent results for stratigraphic and structural digital imagery´s interpretation. However, unsupervised techniques have major limitations especially concerning to stratigraphic units? differentiation. Satellite imagery´s supervised and unsupervised classification has been tested for Western Argentine Precordillera. Using digital elevation modeling we were able to constrain the structural terrain frame in this area. According to the results we delimitate three fracture systems which in order of importance are: NW-SE, N-S and E-W trending systems. As a second step, we performed field surveys of the exposed structures in order to estimate the structural interpretation accuracy previously obtained by imagery processing. Finally, we studied the magnetic properties of the rocks, which was a useful tool for the field mapping work. On the basis of magnetic susceptibility data, it was possible to state a range of the magnetic properties correlating the variations with different lithologies. Thus, digital imagery processing, field geological and magnetic surveys provided enough data to interpret the Precordilleran area as a complex zone affected by superimposed deformation events. Ancient structures play a role as a main control in the modern structure of the Western Precordillera as shown by its complex history. We emphasize that the application of satellite imagery processing provided us with an excellent approach both prior and simultaneously to a detailed geological and structural study.