The arid region piedmonts: glacis and alluvial fans
381
Figure 15.35. Alluvial fan and main fan channel (right). Debris cone with incipient drainage basin
modelled in amphitheatre shape. East of Punta Vacas, Mendoza Province, Argentina. Andean Cordillera.
radial length may enlarge from 3 to 10 km and the fan slope diminishes to 2 to 8 ~
Finally, this last stage can be maintained during long periods of time until rivers or
glaciers will eventually dissect the fans, nevertheless the fan system can be reactivated
by tectonic activity.