@article{fdi:010079680,
  title = {{D}ifferentiated {N}eogene bauxitization of volcanic rocks (western {C}ameroon) : morpho-geological constraints on chemical erosion},
  author = {{M}omo, {M}. {N}. and {B}eauvais, {A}nicet and {T}ematio, {P}. and {Y}emefack, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{L}ateritic weathering of {M}iocene volcanic rocks from western {C}ameroon highlands formed duricrusted bauxitic profiles. {T}wo weathering profiles on ca. 14 {M}a basalt and ca. 16 {M}a trachyte were studied using geochemical mass balance functions. {L}ess mobile elements {T}i and {Z}r were used as references to quantify volumetric change (strain, epsilon), element transfer rate (tau) and geochemical mass transfers during the bauxitization process of basalt and trachyte. {C}onversion of parent rocks to kaolinite and goethite rich saprolites evolved to {A}l-{F}e rich bauxites, mostly composed of gibbsite and iron oxy-hydroxides (goethite and hematite). {H}owever, formation of {A}l-{F}e bauxitic profiles required higher {S}i leaching on trachyte than on basalt. {O}ur results document that chemical weathering of a larger thickness of trachyte than basalt has been required to form a unit meter of weathering profile, implying differential rates of rock chemical erosion and topographic decay of landscapes. {R}ates of chemical erosion and formation of lateritic weathering profiles in western {C}ameroon have been mostly controlled by drainage conditions and volcanic rocks composition (mostly {S}i{O}2 content differences), that also resulted in contrasted landscapes evolution during the {N}eogene.},
  keywords = {{B}auxite ; {L}ateritic weathering ; {G}eochemical mass balance ; {C}hemical erosion ; {V}olcanic rocks ; {C}ameroon ; {CAMEROUN}},
  booktitle = {},
  journal = {{C}atena},
  volume = {194},
  numero = {},
  pages = {104685 [13 ]},
  ISSN = {0341-8162},
  year = {2020},
  DOI = {10.1016/j.catena.2020.104685},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079680},
}