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      https://www.ias.ac.in/article/fulltext/jess/129/0210

    • Keywords

       

      TTG; electron microprobe; xenotime; U–Th–Pb ages; Bundelkhand Craton; India.

    • Abstract

       

      Xenotime is a significant accessory mineral which is being extensively used for precise U–Th–Pb geochronology by Electron Microprobe Analysis (EPMA). This paper presents a protocol for high analytical precision (<3% uncertainties on the measured ages) developed for the accurate estimation of U–Th and Pb content in xenotime using SXFive EPMA at the Department of Geology, Banaras Hindu University, by deploying five spectrometers attached with TAP, LIF, LPET, LTAP and PET crystals. The protocol is applied to the xenotime grains of tonalite-trondhjemite-granodiorite-gneiss (TTG) rocks from the geochronologically well-constrained terrain of the Bundelkhand Craton, central India. The obtained xenotime age 2929$\pm$23 Ma of TTGs is in agreement with the earlier published Neoarchaen 2697$\pm$3 Ma Pb–Pb zircon ages from the same area which validates the authenticity of the analytical method developed at the BHU-EPMA facility.

      $\bf{Highlights}$

      $\bullet$ Analytical protocol for high precision U–Th–Pb chemical dating of xenotime by EPMA.

      $\bullet$ High precision ages from TTG gneiss of the Bundelkhand Craton, Central India.

      $\bullet$ Ages distinguishable from earlier reported ages from other techniques and samples.

      $\bullet$ Validates the authenticity of the analytical method developed at the BHU-EPMA facility.

    • Author Affiliations

       

      HIREDYA CHAUHAN1 APARAJITA TRIPATHI1 DINESH PANDIT1 N V CHALAPATHI RAO1 TALAT AHMAD2

      1. Mantle Petrology Laboratory, Department of Geology, Centre of Advanced Study, Institute of Science, Banaras Hindu University, Varanasi 221 005, India.
      2. University of Kashmir, Srinagar, India.
    • Dates

       
  • Journal of Earth System Science | News

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