N V CHALAPATHI RAO
Articles written in Journal of Earth System Science
Volume 129 All articles Published: 14 October 2020 Article ID 0210 Research article
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.
$\bullet$ 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.
Volume 131 All articles Published: 30 April 2022 Article ID 0108 Research article
We present a comprehensive review on the alkaline rocks from the Deccan Large Igneous Province (DLIP)
and discuss their (i) temporal and spatial association with the Deccan Traps, (ii) petrography, mineral- and
whole-rock geochemistry (including radiogenic and stable isotopes) and geophysical aspects, and (iii)
Volume 131, 2022
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