%0 Journal Article
%T Rol del clima y la tect¨®nica en la evoluci¨®n geomorfol¨®gica de los Andes Semi¨˘ridos chilenos entre los 27-32ˇăS
%A Aguilar
%A Germ¨˘n
%A Riquelme
%A Rodrigo
%A Martinod
%A Joseph
%A Darrozes
%A Jos¨¦
%J Andean geology
%D 2013
%I Scientific Electronic Library Online
%R 10.5027/andgeoV40n1-a04
%X a morphometric analysis that considers hypsometry and topographic slope reveals longitudinal and latitudinal differences in the degree of maturity of the relief of the andes between 27-32ˇăs. whereas landscape rejuvenation of the coastal cordillera takes place to the south of 29.5ˇăs, in the main cordillera it happens south of 28.5ˇăs. the combination of a wetter climate towards the south and the presence of segments with different tectonic features would explain these variations. longitudinally, the geomorphological features indicate the presence of a mountain front that separates the coastal cordillera and the main cordillera. between 28.5 and 30.5ˇăs this front can be attributed to the activity of the vicuŁża-san f¨¦lix fault system, wich during the oligocene-early miocene would have accommodated the relative uplift of the main cordillera. in response to this tectonic activity, successive levels of cut-and-fill pediments may have been formed. during the middle miocene, there was a new episode of uplift affecting the fore-arc and it is in response to this uplift that the valleys that cross this region were excavated. between 28.5 and 30.5ˇăs, the valleys head reached a sufficient altitude to generate fluvio-glacial erosion that allowed the incision of deep canyons in this segment of the main cordillera.
%K semiaridandes
%K topographic slope
%K hypsometry
%K tectonic geomorphology
%K pediments
%K knickzones
%K glacial erosion
%K chile.
%U http://www.scielo.cl/scielo.php?script=sci_abstract&pid=S0718-71062013000100004&lng=en&nrm=iso&tlng=en