@article{fdi:010021572, title = {{R}elations between soil colour and waterlogging duration in a representative hillside of the {W}est {A}frican granito-gneissic bedrock}, author = {{B}lavet, {D}idier and {M}athe, {E}. and {L}eprun, {J}ean-{C}laude}, editor = {}, language = {{ENG}}, abstract = {{C}oncentrations of noble metals ({I}r, {R}u, {R}h,{P}t, {P}d, and {A}u) in ocean-island basalts from the {C}ook {I}slands, {P}olynesia, were determined by improved fire-assay and tellurium coprecipitation techniques with an iductively-coupled-plasma mass spectrometer. {I}sotope, major element, and trace element compositions of these basalts indicate that the present samples include distinctive {HIMU} (high micron - high238{U}/204{P}b) and normal non-{HIMU} basalts. {E}xamination based on {N}i-{M}g-{F}e partitioning between olivine and liquid suggests an only minor effect of accumulation of phenocrysts in governing the compositional variations of the present samples. {T}he fractionation trends obtained show monotonic decrease and increase in noble-metal elements with decreasing {M}g{O} content n {HIMU} and non-{HIMU} basalts, respectively. {T}hese characteristic trends indicate that {HIMU} magmas are differentiated by fractional crystallization and have higher sulfide/silicate ratios than non-{HIMU} basalts. ({R}{\'e}sum{\'e} d'auteur)}, keywords = {{HUMIDITE} {DU} {SOL} ; {SATURATION} ; {SOL} ; {COULEUR} ; {COLORIMETRIE} ; {ROCHE} {MERE} {DU} {SOL} ; {GRANITE} ; {GNEISS} ; {TOPOSEQUENCE} ; {METHODE} {D}'{ANALYSE} ; {MODELISATION} ; {AFRIQUE} {DE} {L}'{OUEST} ; {TOGO}}, booktitle = {}, journal = {{C}atena}, volume = {39}, numero = {3}, pages = {187--210}, ISSN = {0341-8162}, year = {2000}, DOI = {10.1016/{S}0341-8162(99)00087-9}, URL = {https://www.documentation.ird.fr/hor/fdi:010021572}, }