@article{fdi:010079398,
  title = {{T}he distribution of sediment residence times at the foot of mountains and its implications for proxies recorded in sedimentary basins},
  author = {{C}arretier, {S}{\'e}bastien and {G}uerit, {L}. and {H}arries, {R}. and {R}egard, {V}. and {M}affre, {P}. and {B}onnet, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he geochemical and physical properties of terrigenous sediment stacked in sedimentary basins are used as proxies for the paleo-environmental conditions that prevailed during their period of deposition. {N}evertheless, sediment grains have a stochastic transit from mountain sources to sedimentary basins: a fraction of grains are stored for a long time while others are recycled from old deposits. {C}onsequently, the temporal representativity of a population of grains in a sedimentary stratum is uncertain. {T}he potential recycling of old material is a major concern in the reconstruction of paleo-environments and this recycling is usually difficult to evaluate. {I}n particular, the distribution of grain residence times in basins, between sources and sinks, is out of reach. {H}ere we use a landscape evolution model that traces grains to analyse the distribution of residence times in an alluvial apron at the foot of a mountain relief. {W}e study an end-member scenario that is the least favourable for the storage of grains: when the mountain is eroding at the same rate as rock is uplifting. {I}n this case, the alluvial apron behaves as a by-pass zone, when averaging sediment flux over {M}a, and the storage of grains of any size should be minimal. {Y}et, the model predicts that some grains are stored for hundreds of thousands of years before exiting the alluvial apron. {C}onsequently, the mean residence time of sediment grains is much higher than the observed residence time of 95% of the grains exported by the alluvial apron rivers. {T}his process may explain very long residence times found in fluvial systems by geochemical methods based on bulk measurements of sediment. {F}urthermore, it suggests that grains stored for a very long time, although a minority, can bias time-dependent proxies.({C}) 2020 {E}lsevier {B}.{V}. {A}ll rights reserved.},
  keywords = {grain ; residence time ; piedmont rivers ; paleo-environmental proxy ; landscape evolution modelling},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {546},
  numero = {},
  pages = {116448 [14 ]},
  ISSN = {0012-821{X}},
  year = {2020},
  DOI = {10.1016/j.epsl.2020.116448},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079398},
}