@article{fdi:010061284,
  title = {{P}leistocene landscape entrenchment : a geomorphological mountain to foreland field case, the {L}as {T}unas system, {A}rgentina},
  author = {{P}epin, {E}. and {C}arretier, {S}{\'e}bastien and {H}{\'e}rail, {G}{\'e}rard and {R}egard, {V}. and {C}harrier, {R}. and {F}arias, {M}. and {G}arcia, {V}. and {G}iambiagi, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he study of the {L}as {T}unas {R}iver incisions, located in the eastern {A}ndean foreland front (33 degrees 20'{S} in {A}rgentina), provides new clues for the interpretation of deep piedmont entrenchments. {B}oth the {L}as {T}unas mountain catchment and its piedmont are strongly entrenched with maximal incision of over 100 m at the mountain front. {T}hree main terrace levels are well exposed and are labelled {T}1, {T}2 and {T}3 from the youngest to the oldest. {W}e combined geological and geomorphological field observations, kinematic {GPS} data, satellite data and aerial photos with geochronological {A}r-40/{A}r-39 and 10{B}e analysis to provide a detailed description of terrace organization and a discussion of the evolution of the {L}as {T}unas landscape. {T}he surprisingly constant 10{B}e concentrations in surface layers as deep as 1.5 m show that gently dipping alluvial surfaces can be continuously and deeply mixed. {O}ur data show a first period of deposition ({M}esones {F}m) before 0.85 {M}yr (minimum {T}3 age), followed by deep erosion and a second sedimentation period ({L}as {T}unas {F}m) that includes a ca. 0.6 {M}yr ash deposit. {T}2 and {T}1 are inset in the {L}as {T}unas {F}m and were abandoned ca. 15-20 kyr ago. {T}he similar ages for {T}2 and {T}1 show that post-20 kyr entrenchment occurred very rapidly. {D}espite {Q}uaternary deformation in the {L}as {T}unas piedmont, terrace entrenchment is best explained by paleo-climatic changes. {T}he terrace organization reveals that the erosion-sedimentation phases affected the entire system from the piedmont toe to 10 km upstream of the mountain front. {F}inally, contrary to the neighbouring more deeply incised {D}iamante {R}iver system, where late {Q}uaternary piedmont uplift is more likely to have been a factor causing incision, the more stable {L}as {T}unas system provides an incomplete geomorphological record of {P}leistocene and {H}olocene climate variations. {W}e suggest that climate variations are better recorded in uplifting piedmonts than in stable ones, where the magnitude of incision and sedimentation and the fact that they occur repeatedly at the same elevation can erase a large part of the record.},
  keywords = {{ARGENTINE} ; {ANDES}},
  booktitle = {},
  journal = {{B}asin {R}esearch},
  volume = {25},
  numero = {6},
  pages = {613--637},
  ISSN = {0950-091{X}},
  year = {2013},
  DOI = {10.1111/bre.12019},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061284},
}