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U-Pb isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe

(2019) CHEMICAL GEOLOGY. 512. p.69-84
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Abstract
Columbite-tantalite group minerals are the most common Nb-Ta minerals. Columbite-tantalite is particularly suitable for U-Pb dating due to its high U and low common Pb contents. In 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 Nb and Ta and between Mn and Fe. Our study has two objectives: i) establish a database of reference materials for in situ U-Pb isotopic dating of columbite-tantalite minerals and ii) test the capability of SIMS to in situ U-Pb date columbite-tantalite minerals of different chemical composition. Tests of in situ U-Pb dating demonstrate that SIMS can easily be used to date columbite-tantalite minerals with errors and precisions overlapping the reference ID-TIMS age. There are, however, significant matrix effects for non-matching Nb-Ta-Fe-Mn compositions of sample and reference material. Matrix effects are highly correlated with the Ta/(Ta+Nb) ratio of columbite-tantalite, due to the significant difference in the atomic mass of Nb and Ta. The Mn/(Mn+Fe) ratio does not significantly contribute to the observed matrix effect as the two elements have similar atomic masses. The linear correlation between Ta/(Nb+Ta) and ((Pb-206/U-238)(SIMS)/(Pb-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. The ability to measure Pb-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
Columbite-tantalite, Niobium, Tantalum, U-Pb dating, SIMS, ID-TIMS, Geochronology, RARE-ELEMENT PEGMATITES, TANTALUM-(NIOBIUM-TIN) MINERALIZATION, GRANITIC PEGMATITES, CHEMICAL EVOLUTION, METAMICT ZIRCON, OXIDE MINERALS, ALPHA-RECOIL, AGES, MAGMATISM, CONSTRAINTS

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MLA
Legros, Hélène et al. “U-Pb Isotopic Dating of Columbite-tantalite Minerals : Development of Reference Materials and in Situ Applications by Ion Microprobe.” CHEMICAL GEOLOGY 512 (2019): 69–84. Print.
APA
Legros, H., Mercadier, J., Villeneuve, J., Romer, R. L., Deloule, E., Van Lichtervelde, M., Dewaele, S., et al. (2019). U-Pb isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe. CHEMICAL GEOLOGY, 512, 69–84.
Chicago author-date
Legros, Hélène, Julien Mercadier, Johan Villeneuve, Rolf L Romer, Etienne Deloule, Marieke Van Lichtervelde, Stijn Dewaele, et al. 2019. “U-Pb Isotopic Dating of Columbite-tantalite Minerals : Development of Reference Materials and in Situ Applications by Ion Microprobe.” Chemical Geology 512: 69–84.
Chicago author-date (all authors)
Legros, Hélène, Julien Mercadier, Johan Villeneuve, Rolf L Romer, Etienne Deloule, Marieke Van Lichtervelde, Stijn Dewaele, Philippe Lach, Xu-Dong Che, Ru-Cheng Wang, Ze-Ying Zhu, Eric Gloaguen, and Jérémie Melleton. 2019. “U-Pb Isotopic Dating of Columbite-tantalite Minerals : Development of Reference Materials and in Situ Applications by Ion Microprobe.” Chemical Geology 512: 69–84.
Vancouver
1.
Legros H, Mercadier J, Villeneuve J, Romer RL, Deloule E, Van Lichtervelde M, et al. U-Pb isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe. CHEMICAL GEOLOGY. 2019;512:69–84.
IEEE
[1]
H. Legros et al., “U-Pb isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe,” CHEMICAL GEOLOGY, vol. 512, pp. 69–84, 2019.
@article{8606792,
  abstract     = {Columbite-tantalite group minerals are the most common Nb-Ta minerals. Columbite-tantalite is particularly suitable for U-Pb dating due to its high U and low common Pb contents. In 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 Nb and Ta and between Mn and Fe. Our study has two objectives: i) establish a database of reference materials for in situ U-Pb isotopic dating of columbite-tantalite minerals and ii) test the capability of SIMS to in situ U-Pb date columbite-tantalite minerals of different chemical composition. Tests of in situ U-Pb dating demonstrate that SIMS can easily be used to date columbite-tantalite minerals with errors and precisions overlapping the reference ID-TIMS age. There are, however, significant matrix effects for non-matching Nb-Ta-Fe-Mn compositions of sample and reference material. Matrix effects are highly correlated with the Ta/(Ta+Nb) ratio of columbite-tantalite, due to the significant difference in the atomic mass of Nb and Ta. The Mn/(Mn+Fe) ratio does not significantly contribute to the observed matrix effect as the two elements have similar atomic masses. The linear correlation between Ta/(Nb+Ta) and ((Pb-206/U-238)(SIMS)/(Pb-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. The ability to measure Pb-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.},
  author       = {Legros, Hélène and Mercadier, Julien and Villeneuve, Johan and Romer, Rolf L and Deloule, Etienne and Van Lichtervelde, Marieke and Dewaele, Stijn and Lach, Philippe and Che, Xu-Dong and Wang, Ru-Cheng and Zhu, Ze-Ying and Gloaguen, Eric and Melleton, Jérémie},
  issn         = {0009-2541},
  journal      = {CHEMICAL GEOLOGY},
  keywords     = {Columbite-tantalite,Niobium,Tantalum,U-Pb dating,SIMS,ID-TIMS,Geochronology,RARE-ELEMENT PEGMATITES,TANTALUM-(NIOBIUM-TIN) MINERALIZATION,GRANITIC PEGMATITES,CHEMICAL EVOLUTION,METAMICT ZIRCON,OXIDE MINERALS,ALPHA-RECOIL,AGES,MAGMATISM,CONSTRAINTS},
  language     = {eng},
  pages        = {69--84},
  title        = {U-Pb isotopic dating of columbite-tantalite minerals : development of reference materials and in situ applications by ion microprobe},
  url          = {http://dx.doi.org/10.1016/j.chemgeo.2019.03.001},
  volume       = {512},
  year         = {2019},
}

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