@article{fdi:010061809,
  title = {{G}eochemistry of the {P}aleocene-{E}ocene and {M}iocene-{P}liocene clayey materials of the eastern part of the {W}ouri {R}iver ({D}ouala sub-basin, {C}ameroon) : influence of parent rocks},
  author = {{N}gon, {G}. {F}. {N}. and {M}bog, {M}. {B}. and {E}tame, {J}. and {N}tamak-{N}ida, {M}. {J}. and {L}ogmo, {E}. {O}. and {G}{\'e}rard, {M}artine and {Y}ongue-{F}ouateu, {R}. and {B}ilong, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}ajor and trace element concentrations of clay deposits of the {M}issole {II} and {B}omkoul respectively from the {P}aleocene-{E}ocene {N}'{K}apa {F}ormation and the {M}iocene-{P}liocene-{M}atanda-{W}ouri {F}ormation in the eastern part of the {W}ouri {R}iver in the {D}ouala sub-basin of {C}ameroon have been investigated to identify the parent rocks. {T}o carry out this study, {X}-ray diffraction, inductively coupled plasma-atomic emission spectrometry ({ICP}/{AES}) and inductively coupled plasma-mass spectrometry ({ICP}/{MS}) were performed to determine respectively the mineralogical and chemical data of {M}issole {II} and {B}omkoul clayey materials. {C}lay sediments are essentially kaolinitic and illitic, and kaolinitic and smectitic respectively in both sites. {T}hey are generally siliceous, aluminous with small iron and bases ({M}g{O}, {C}a{O}, {N}a2{O}, and {K}2{O}) contents. {S}amples of {M}issole {II} profiles are more siliceous than those from the {B}omkoul grey and dark grey clayey materials. {C}layey materials have high {C}hemical {I}ndex of {A}lteration ({CIA} = 80-99.34) which suggests that they are strongly weathered under humid tropical climate before and after their deposition in the coastal plain. {T}he value of {E}u/{E}u* (0.48-0.61), {L}a/{S}c (2.15-20.50), {T}h/{S}c (0.74-2.25), {T}h/{C}o (1.08-8.33), and {C}r/{T}h (5.24-13.55) ratios support essentially a silicic or felsic parent rocks. {T}otal {REE} concentrations reflect the variations in their grain-size fractions. {C}hondrite-normalised {REE} patterns with {LREE} enrichment, flat {HREE}, and negative {E}u anomaly are attributed essentially to silicic or felsic parent rocks like those from weathered materials developed from the gneisses around the coastal plain in the littoral part of {C}ameroon ({N}oa {T}ang et al., 2012), main characteristic of {P}aleocene-{E}ocene and {M}iocene-{P}liocene clay sediments of {M}issole {II} and {B}omkoul areas.},
  keywords = {{B}omkoul ; {C}ameroon ; {C}lay deposit ; {D}ouala sub-basin ; {G}eochemistry ; {P}arent rocks ; {CAMEROUN}},
  booktitle = {},
  journal = {{J}ournal of {A}frican {E}arth {S}ciences},
  volume = {91},
  numero = {},
  pages = {110--124},
  ISSN = {1464-343{X}},
  year = {2014},
  DOI = {10.1016/j.jafrearsci.2013.12.005},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061809},
}