@article{PAR00008609,
  title = {{T}he impact of redox conditions on the rare earth element signature of redoximorphic features in a soil sequence developed from limestone},
  author = {{L}aveuf, {C}. and {C}ornu, {S}. and {G}uilherme, {L}.{R}.{G}. and {G}uerin, {A}. and {J}uillot, {F}arid},
  editor = {},
  language = {{ENG}},
  abstract = {{R}edox processes, which are widespread in soils, need to be quantified for an improved comprehension of the dynamics of {F}e- and {M}n-oxides and their associated trace elements. {T}he classical methodology used to study these redox processes generally relies on the quantification of all mineral species in the various pedological features that can be related to different redox stages. {H}owever, this approach usually encounters the difficulty of precisely quantifying the different forms of poorly crystallised {F}e- and {M}n-oxides. {I}n this study, we use the signature of rare earth elements ({REE}s) to visualise and, eventually, quantify the importance of redox processes in soils. {O}ur approach relies on that developed by {L}aveuf et al. (2008) and the idea that the relative contribution to the mobilisation of {REE}s that is made by the primary minerals reactive to redox conditions depends on the following factors: (i) their initial proportion in the different pedological features that can be related to various redox processes, (ii) their relative mobilisation during the redox process in question, and (iii) their initial {REE} signatures. {T}he catena studied is characterised by two stages of redox conditions: the first is related to the formation and subsequent dissolution of {F}e-{M}n concretions, and the second is related to the bleaching of the soil matrix due to morphological degradation. {I}n this soil, the main minerals reactive to redox conditions are {M}n-oxides, ferrihydrite, goethite and (fluor)apatite. {T}he results indicate that the primary redox conditions can be characterised by a positive {C}e anomaly on the {REE} pattern, which has been attributed to a preferential immobilisation of this element, due to its association with {M}n-oxides. {T}he results also indicate that the secondary redox conditions can be characterised by depletion in medium {REE}s ({MREE}s) in the {REE} pattern, which has been attributed to a preferential release of these elements during the dissolution of (fluor)apatite and, to a lesser extent, of ferrihydrite. {T}hese results emphasise the potential of {REE} signatures of the visualisation of the various redox processes that have been active in a soil. {A}dditionally, {REE} signatures are a proxy of the frequency and intensity of the redox conditions.},
  keywords = {{F}e ; {M}n ; {L}anthanides ; {O}xidation-reduction ; {P}edogenesis ; {FRANCE}},
  booktitle = {},
  journal = {{G}eoderma},
  volume = {170},
  numero = {},
  pages = {25--38},
  ISSN = {0016-7061},
  year = {2012},
  DOI = {10.1016/j.geoderma.2011.10.014},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00008609},
}