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Plesovice zircon : A new natural reference material for U-Pb and Hf isotopic microanalysis
- Slama, Jiri (author)
- Kosler, Jan (author)
- Condon, Daniel J. (author)
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- Crowley, James L. (author)
- Gerdes, Axel (author)
- Hanchar, John M. (author)
- Horstwood, Matthew S. A. (author)
- Nasdala, Lutz (author)
- Norberg, Nicholas (author)
- Schaltegger, Urs (author)
- Schoene, Blair (author)
- Tubrett, Michael N. (author)
- Whitehouse, Martin J. (author)
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- (creator_code:org_t)
- Elsevier BV, 2008
- 2008
- English.
- In: Chemical Geology. - : Elsevier BV. - 0009-2541 .- 1872-6836. ; 249:02-jan, s. 1-35
- Journal article (peer-reviewed)
Abstract
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- Matrix-matched calibration by natural zircon standards and analysis of natural materials as a reference are the principle methods for achieving accurate results in inicrobeam U-Pb dating and Hf isotopic analysis. We describe a new potential zircon reference material for laser ablation ICP-MS that was extracted from a potassic granulite facies rock collected in the southern part of the Bohemian Massif (Plesovice, Czech Republic). Data from different techniques (ID-TIMS, SIMS and LA ICP-MS) and several laboratories suggest that this zircon has a concordant U-Pb age with a weighted mean Pb-206/U-238 date of 337.13 +/- 0.37 Ma (ID-TIMS, 95% confidence limits, including tracer calibration uncertainty) and U-Pb age homogeneity on the scale used in LA ICP-MS dating. Inhomogeneities in trace element composition due to primary growth zoning prevent its use as a calibration standard for trace element analysis. The content of U varies from 465 ppm in pristine parts of the grains to similar to 3000 ppm in actinide-rich sectors that correspond to pyramidal faces with a high degree of metamictization (present in ca. 30% of the grains). These domains are easily recognized from high intensities on BSE images and should be avoided during the analysis. Hf isotopic composition of the Plesovice zircon (>0.9 wt.% Hf) is homogenous within and between the grains with a mean Hf-176/Hf-177 value of 0.282492 +/- 0.000013 (2SD). The age and Hf isotopic homogeneity of the Plesovice zircon together with its relatively high U and Pb contents make it an ideal calibration and reference material for laser ablation ICP-MS measurements, especially when using low laser energies and/or small diameters of laser beam required for improved spatial resolution.
Keyword
- zircon reference material
- laser ablation ICP-MS
- Plesovice
- U-Pb dating
- Hf isotopes
- Bohemian Massif
- NATURAL SCIENCES
- NATURVETENSKAP
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- ref (subject category)
- art (subject category)
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