0000000000793857
AUTHOR
Gerhard Abele
Geomorphological west-east-section through the north chilean andes near antofagasta
The extremely arid western slope of the Andes near Antofagasta is an area of young tectonic movements on the one hand, but of very low erosion rates on the other. Therefore the relief is characterized by very old erosional forms, but fresh and clearly visible tectonic forms. This is quite evident from the following characteristics of a west-east-section from the Coastal Cordillera to the High Cordillera: 1. The great height and steepness of the western escarpment of the Coastal Cordillera, devoid of deep valleys. 2. The preservation of the miocene and pliocene caliche deposits with highly soluble nitrates in the eastern part of the Coastal Cordillera and of the landforms covered by them. 3.…
El Lahar Tinguiririca: su significado entre los Lahares chilenos
The Tinguiririca lahar is an example of many similar landforms, which cover large surfaces 60th in andine valleys and the Chilean longitudinal depression. I t is smaller than other ones in Chile, but - at the same time - better conserved, offering good conditions for genetic, kinematic and geochronologic studies, respecting volcanic mudflows. From the genetic and kinematic point of view, the longitudinal lahar profile may be in two parts: a) An upper and middle accumulative area, with concave transverse profile; b) A low accumulative area; whose transverse profile is convexe. These two profiles could be explained by means of braking process in lateral parts, related to central parts, as a f…