@article{PAR00019213,
  title = {{U}-{P}b isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe},
  author = {{L}egros, {H}. and {M}ercadier, {J}. and {V}illeneuve, {J}. and {R}omer, {R}. {L}. and {D}eloule, {E}. and {V}an {L}ichtervelde, {M}arieke and {D}ewaele, {S}. and {L}ach, {P}. and {C}he, {X}. {D}. and {W}ang, {R}. {C}. and {Z}hu, {Z}. {Y}. and {G}loaguen, {E}. and {M}elleton, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{C}olumbite-tantalite group minerals are the most common {N}b-{T}a minerals. {C}olumbite-tantalite is particularly suitable for {U}-{P}b dating due to its high {U} and low common {P}b contents. {I}n situ isotopic dating of columbite-tantalite by {LA}-{ICP}-{MS} or {SIMS} requires certified reference material to properly account for potential matrix effects linked to substitutions between {N}b and {T}a and between {M}n and {F}e. {O}ur study has two objectives: i) establish a database of reference materials for in situ {U}-{P}b isotopic dating of columbite-tantalite minerals and ii) test the capability of {SIMS} to in situ {U}-{P}b date columbite-tantalite minerals of different chemical composition. {T}ests of in situ {U}-{P}b dating demonstrate that {SIMS} can easily be used to date columbite-tantalite minerals with errors and precisions overlapping the reference {ID}-{TIMS} age. {T}here are, however, significant matrix effects for non-matching {N}b-{T}a-{F}e-{M}n compositions of sample and reference material. {M}atrix effects are highly correlated with the {T}a/({T}a+{N}b) ratio of columbite-tantalite, due to the significant difference in the atomic mass of {N}b and {T}a. {T}he {M}n/({M}n+{F}e) ratio does not significantly contribute to the observed matrix effect as the two elements have similar atomic masses. {T}he linear correlation between {T}a/({N}b+{T}a) and (({P}b-206/{U}-238)({SIMS})/({P}b-206/{U}-238) ({ID}-{TIMS})) obtained for columbite-tantalite minerals of known {ID}-{TIMS} age demonstrates that the {SIMS} matrix-effect can be properly accounted for by using the chemical composition as determined by {EMPA}. {T}he ability to measure {P}b-204 by {SIMS} also allows the use of reference materials with a small common lead contribution and to calculate accurate and precise ages for columbite-tantalite minerals with contributions of common lead.},
  keywords = {{C}olumbite-tantalite ; {N}iobium ; {T}antalum ; {U}-{P}b dating ; {SIMS} ; {ID}-{TIMS} ; {G}eochronology ; {COTE} {D}'{IVOIRE} ; {RWANDA} ; {CHINE} ; {FRANCE}},
  booktitle = {},
  journal = {{C}hemical {G}eology},
  volume = {512},
  numero = {},
  pages = {69--84},
  ISSN = {0009-2541},
  year = {2019},
  DOI = {10.1016/j.chemgeo.2019.03.001},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00019213},
}