@article{fdi:010065837,
  title = {{W}ater-rock interaction and residence time of groundwater inferred by {U}-234/{U}-238 disequilibria in the {T}unisian {C}ontinental {I}ntercalaire aquifer system},
  author = {{P}etersen, {J}.{O}. and {D}eschamps, {P}ierre and {H}amelin, {B}runo and {G}oncalves, {J}. and {M}ichelot, {J}.{L}. and {Z}ouari, {K}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he uranium content and 234{U}/238{U} ratios have been measured in more than thirty groundwater samples over the {T}unisian part of the {C}ontinental {I}ntercalaire ({CI}) aquifer. {I}n this large artesian aquifer, uranium behavior is mainly controlled by redox front systems. {T}he uranium concentrations vary by 5 orders of magnitude from 10-4 to 20 ppb and the (234{U}/238{U}) activity ratio from 1 to 10. {C}lose to {CI} outcrops in the {D}ahar {M}ountains, the stepwise decrease in {U} concentrations combined with a significant increase of the (234{U}/238{U}) ratio up to 10 ("augmenting regime") is followed, downflow by a (234{U}/238{U}) decrease up to 3 ("decaying regime"), clearly indicating the occurrence of a redox front. {W}e will discuss the significance of 234{U}-238{U} disequilibria in terms of water residence times and its potential to trace water-rock interaction mechanisms.},
  keywords = {{EAU} {SOUTERRAINE} ; {AQUIFERE} ; {HYDROGEOLOGIE} ; {QUALITE} {DE} {L}'{EAU} ; {URANIUM} ; {ECHANTILLONNAGE} ; {ANALYSE} {CHIMIQUE} ; {METHODOLOGIE} ; {MASSIF} ; {INTERACTION} {ROCHE} {EAU} ; {TUNISIE} ; {DAHAR} {MASSIF}},
  booktitle = {{P}roceedings of the fourteenth international symposium on water-rock interaction ({WRI} 14)},
  journal = {{P}rocedia {E}arth and {P}lantetary {S}cience},
  volume = {7},
  numero = {},
  pages = {685--688},
  ISSN = {1878-5220},
  year = {2013},
  DOI = {10.1016/j.proeps.2013.03.206},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065837},
}