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Plešovice zircon – A new natural standard for U-Pb and Hf isotopic microanalysis
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2007 (English)In: Goldschmidt Conference Abstracts, 2007Conference paper (Other academic)
Abstract [en]

Increasing number of geological applications requires the

use of well-characterized and widely available reference

materials for in situ analysis. We have established a new

natural zircon standard (“Plešovice”) for U-Pb dating and Hf

isotopic analysis by laser ablation ICP-MS.

The ID-TIMS U-Pb age of the Plešovice zircon has been

determined to 336.9±0.2 Ma (95% confidence limits; mean

206Pb/238U age). The U-Pb ages obtained by LA ICP-MS (3

labs) and SIMS techniques show larger spread but within their

analytical uncertainties they are consistent with the TIMS age.

Hafnium isotopic composition of the Plešovice zircon appears

to be homogenous within and between grains. Combined laser

ablation and solution MC ICP-MS analyses gave a mean

176Hf/177Hf value of 0.282481±0.000013 (95% confidence

limits, 87 analyses). Cathodoluminescence and BSE imaging

and chemical analyses revealed that discrete zones in the

Plešovice zircon are enriched in trace elements and especially

in U and Th. Raman spectroscopy suggests that these highly

radiation-damaged areas have not undergone any annealing.

Our LA ICP-MS analyses did not indicate any Pb-loss but the

high intensities of measured U signal require that these areas

are avoided during routine U-Pb isotopic analysis.

Place, publisher, year, edition, pages
URN: urn:nbn:se:su:diva-19518OAI: diva2:186042
Available from: 2007-11-12 Created: 2007-11-12Bibliographically approved

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