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U-Pb columbite-tantalite chronology of rare-element pegmatites using TIMS and Laser Ablation-Multi Collector-ICP-MS

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Abstract

U-Pb isotopic analyses using TIMS and Laser Ablation-Multi Collector-ICP-MS were carried out on columbite-tantalite minerals from three suites of rare-element (Li, Cs, Ta) pegmatites in the Superior Province of Canada. Conventional TIMS analyses of these columbite-tantalite crystals produce scattered data and reverse discordance even after HF leaching of the grains prior to dissolution, possibly reflecting the incomplete removal of the open-system metamict segments during sample preparation. LA-MC-ICP-MS analyses of unleached, primary columbite free from inclusions and alteration give consistent and precise (<0.5%) Pb-Pb ages, demonstrating the utility of this approach. However, normal and reverse discordance is also observed in U-Pb data from LA-MC-ICP-MS analyses. This discordance represents either U-Pb mobilisation during recent weathering, sample preparation and/or an analytical artefact originating from variable elemental fractionation between U and Pb during ablation and ionisation that itself may have its origin in the contrasting metamictization of the dated columbite and the monazite standard used. Best age estimates of columbite from pegmatites in the Superior Province are; 2670±5 Ma for the Pakeagama Lake pegmatite, 2644±7 Ma for the Separation Rapids group, and 2665±8 Ma for the Mavis Lake group. The ages broadly show that the rare-element pegmatites are temporally synchronous with adjacent peraluminous granites.

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Acknowledgements

S. Smith acknowledges postgraduate studentship funding from The Open University and the Ontario Geological Survey. Analyses carried out at the NERC Isotope Geosciences Laboratory, Keyworth, were funded by ‘Isotopic Analytical Support’ from the Natural Environment Research Council, UK. Constructive reviews by R. Parrish and an anonymous reviewer greatly improved an earlier version of the manuscript.

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  1. S. R. Smith

    Present address: Geological Survey of Canada, 601 Booth St., Ottawa, Ontario, K1A 0E8, Canada

Authors and Affiliations

  1. Dept. of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK

    S. R. Smith, A. G. Tindle & S. P. Kelley

  2. NERC Isotope Geosciences Laboratory, Keyworth, Nottingham, NG12 5GG, UK

    G. L. Foster, S. R. Noble & M. Horstwood

  3. GeoForschungsZentrum Potsdam, Telegrafenberg, D-14473 Potsdam, Germany

    R. L. Romer

  4. Ontario Geological Survey, 933 Ramsey Lake Road, Sudbury, Ontario, P3E 6B5, Canada

    F. W. Breaks

  5. Department of Geology, Leicester University, Leicester, LE1 7RH, UK

    G. L. Foster

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Smith, S.R., Foster, G.L., Romer, R.L. et al. U-Pb columbite-tantalite chronology of rare-element pegmatites using TIMS and Laser Ablation-Multi Collector-ICP-MS. Contrib Mineral Petrol 147, 549–564 (2004). https://doi.org/10.1007/s00410-003-0538-y

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