El patrón hidrográfico de la cuenca del río Blanco: control tectónico y geomorfológico

Abstract

The geometry and dynamics of the hydrographic pattern in the Blanco River basin, display major changes in short periods of geologic time, as a response to tectonic, climatic and geomorphologic variations. Captures and Postglacial reorganization of the pattern, were characterized by morphometric hortonian type analysis of Radar Images from NASA SRTM Mission (2000), using the River Tools and ENVI programs, as well as 1 :50.000 topographic maps from the I.G.M. The geomorphologic mapping was done by photo interpretation and field work. Two C14 radiogenic dating were obtains of morrenic and lacustrine sediments. The river captures and the present hydrographic pattern of the Blanco river were defined about 2.000 years ago, during the Holocene, mainly due to tectonic factors and desglaciación processes on the Austral zone of Chile.