@article{fdi:010074383,
  title = {{M}ulti-scale distribution of potassium : thorium and uranium in paleoproterozoic granites from eastern {S}enegal},
  author = {{F}all, {M}. and {B}aratoux, {D}avid and {N}diaye, {P}. {M}. and {J}essell, {M}. and {B}aratoux, {L}enka},
  editor = {},
  language = {{ENG}},
  abstract = {{P}otassium ({K}), thorium ({T}h) and uranium ({U}) are good tracers of magmatic or alteration processes and the surface concentrations of these elements may be mapped at the regional or local scale by airborne radiometric (gamma) surveys. {G}eological mapping and mineral exploration are therefore often supported by airborne radiometric surveys, especially in areas of scarce outcrops (e.g., tropical regions). {H}owever, a quantitative use of these data poses a problem of scale to the petrologist. {T}he comparison between rock sample analyses and airborne values, corresponding to average concentrations over hundreds of square meters, requires knowledge of the distribution of {K}-{T}h-{U} concentrations at different scales. {F}or this purpose, we undertook a multi-scale analysis of {K}-{T}h-{U} concentrations on four {P}aleoproterozoic granitoid massifs in eastern {S}enegal ({B}alangouma, {B}adon, {M}oussala and {S}araya). {O}ur method combines geochemical bulk rock analyses, four high-resolution grids (150 m*150 m, 5 m spacing) using a {F}ield {P}ortable {G}amma {R}ay {S}pectrometer ({FPGRS}), and an airborne regional survey of eastern {S}enegal (similar to 30 000 km(2), 250 m line spacing). {W}e find a large scatter of {K}-{T}h-{U} concentrations at the small scale, with the existence of right-skewed frequency distributions approaching a lognormal behavior. {T}his implies that airborne concentrations may systematically differ from the most frequent values measured on the ground at the {FPGRS} or sample scale. {T}he scale-dependence of {K}-{T}h-{U} distributions is considered to be, in part, a consequence of the central limit theorem applied on radiometric data.},
  keywords = {{SENEGAL}},
  booktitle = {},
  journal = {{J}ournal of {A}frican {E}arth {S}ciences},
  volume = {148},
  numero = {{N}o sp{\'e}cial},
  pages = {30--51},
  ISSN = {1464-343{X}},
  year = {2018},
  DOI = {10.1016/j.jafrearsci.2018.03.026},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074383},
}