@article{fdi:010053631,
  title = {{L}ate {M}iocene-{H}olocene canyon incision in the western {A}ltiplano, northern {C}hile : tectonic or climatic forcing ?},
  author = {{G}arcia, {M}. and {R}iquelme, {R}. and {F}arias, {M}. and {H}{\'e}rail, {G}{\'e}rard and {C}harrier, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}ajor fluvial incision (600-1000 m) affecting the {C}oastal {C}ordillera and {C}entral {D}epression of northern {C}hile is analysed to evaluate supposed coeval uplift of the {A}ltiplano and/or climatic changes in the {A}tacama {D}esert. {T}he timing of the beginning of incision is constrained by the age of deposition of the {C}entral {D}epression top. {I}n the north (18-19 degrees {S}), this top corresponds to fluvial gravels accumulated between 11.9 +/- 0.6 {M}a and 8.3 +/- 0.5 {M}a, which are genetically related to semiarid climate and to an eastward poorly dissected parallel drainage network that developed between 15.0 +/- 0.6 and 11.2 +/- 0.6 {M}a; thus, gravel deposition ended at 11.9-11.2 {M}a. {T}o the south (19-208{S}), the {C}entral {D}epression top corresponds to c. 6 {M}a alluvial deposits. {S}tratigraphically determined canyon ages and knickzone locations indicate that southward dissection began later and/or developed under a regime of lower erosion capacity owing to drier climate. {V}ertical incision rate evolution is compatible with eastward knickzone migration. {D}issection required a considerable altitude difference between ancient and present-day river base levels, which was achieved predominantly by basin infill on an already partially elevated bedrock. {T}herefore subsequent incision would have been triggered by local semiarid climatic periods rather than by contemporaneous surface uplift. {E}xoreic canyons occur when climatic conditions in the catchments are arid-semiarid whereas endoreism is developed when these conditions in catchments are hyperarid.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of the {G}eological {S}ociety},
  volume = {168},
  numero = {4},
  pages = {1047--1060},
  ISSN = {0016-7649},
  year = {2011},
  DOI = {10.1144/0016-76492010-134},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053631},
}