@article{fdi:010079877,
  title = {{T}he redistribution of thorium, uranium, potassium by magmatic and hydrothermal processes versus surface processes in the {S}araya {B}atholith ({E}astern {S}enegal) : insights from airborne radiometrics data and topographic roughness},
  author = {{F}all, {M}. and {B}aratoux, {D}avid and {J}essell, {M}. and {N}diaye, {P}. {M}. and {V}anderhaeghe, {O}. and {M}oyen, {J}. {F}. and {B}aratoux, {L}enka and {B}onzi, {W}. {M}. {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}otassium ({K}), thorium ({T}h), and uranium ({U}) are incompatible elements, with various degrees of mobility with respect to hydrothermal alteration or weathering and are taken as tracers for magmatic, fluid-rock interactions and mineralization. {T}hese elements may be mapped from airborne radiometric surveys revealing their spatial distribution at the surface. {M}agmatic processes (partial melting, migration and crystallization of silicate melts), hydrothermal alteration, and superficial processes (in situ weathering, erosion and transport) are responsible for the distribution of these elements in the rock, regolith and soil. {H}owever, these processes do not operate at the same scales, and we postulate that they produce distinct spatial distributions of {K}, {T}h and {U} concentrations. {I}n this study, we combined geostatistical approaches, such as analyses of frequency distributions and variograms with roughness and topographic mapping to decipher the respective role of magmatic and hydrothermal processes versus surface processes on the spatial distribution of {K}, {T}h and {U} concentrations at the surface of the {S}araya {B}atholith ({E}astern {S}enegal). {W}e found that the distributions of {K} and {T}h are anisotropic and correlate to the different magmatic sub-units of the {B}atholith in the northern part of the {S}araya {B}atholith, which is currently incised by a network of riverbeds, as revealed by the roughness map. {I}n contrast, the surface of the southern part of the {S}araya {B}atholith is dominated by chemical weathering and is characterized by depletion and reduced anisotropy of {K} and enrichment in {T}h with respect to the northern part. {T}he {K}, {T}h and {U} concentrations in the southern part are therefore controlled by surface processes masking the primary (magmatic) signatures. {T}hese results motivate similar analyses of spatial patterns of {K}, {T}h and {U} concentrations in other contexts in support for geological mapping and mineral exploration.},
  keywords = {{G}amma-ray spectrometry ; {R}oughness ; {G}eostatistics ; {V}ariogram ; {SENEGAL} ; {SARAYA} ; {KONDOKHO}},
  booktitle = {},
  journal = {{J}ournal of {G}eochemical {E}xploration},
  volume = {219},
  numero = {},
  pages = {106633 [18 p.]},
  ISSN = {0375-6742},
  year = {2020},
  DOI = {10.1016/j.gexplo.2020.106633},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079877},
}