GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology

Lutz Nasdala, Fernando Corfu, Blair Schoene, Simon R. Tapster, Corey J. Wall, Mark D. Schmitz, Maria Ovtcharova, Urs Schaltegger, Allen K. Kennedy, Andreas Kronz, Peter W Reiners, Yue Heng Yang, Fu Yuan Wu, Sarah E.M. Gain, William L. Griffin, Dawid Szymanowski, Chutimun Chanmuang N., Martin Ende, John W. Valley, Michael J. Spicuzza & 2 others Bhuwadol Wanthanachaisaeng, Gerald Giester

Research output: Contribution to journalArticle

Abstract

Here, we document a detailed characterisation of two zircon gemstones, GZ7 and GZ8. Both stones had the same mass at 19.2 carats (3.84 g) each; both came from placer deposits in the Ratnapura district, Sri Lanka. The U-Pb data are in both cases concordant within the uncertainties of decay constants and yield weighted mean 206Pb/238U ages (95% confidence uncertainty) of 530.26 Ma ± 0.05 Ma (GZ7) and 543.92 Ma ± 0.06 Ma (GZ8). Neither GZ7 nor GZ8 have been subjected to any gem enhancement by heating. Structure-related parameters correspond well with the calculated alpha doses of 1.48 × 1018 g−1 (GZ7) and 2.53 × 1018 g−1 (GZ8), respectively, and the (U-Th)/He ages of 438 Ma ± 3 Ma (2s) for GZ7 and 426 Ma ± 9 Ma (2s) for GZ8 are typical of unheated zircon from Sri Lanka. The mean U mass fractions are 680 μg g−1 (GZ7) and 1305 μg g−1 (GZ8). The two zircon samples are proposed as reference materials for SIMS (secondary ion mass spectrometry) U-Pb geochronology. In addition, GZ7 (Ti mass fractions 25.08 μg g−1 ± 0.18 μg g−1; 95% confidence uncertainty) may prove useful as reference material for Ti-in-zircon temperature estimates.

Original languageEnglish (US)
Pages (from-to)431-457
Number of pages27
JournalGeostandards and Geoanalytical Research
Volume42
Issue number4
DOIs
StatePublished - Dec 1 2018

Fingerprint

Geochronology
Secondary ion mass spectrometry
geochronology
zircon
mass spectrometry
ion
Placers
gemstone
Gems
placer deposit
Deposits
heating
Heating
material
Uncertainty
temperature
Temperature

Keywords

  • reference material
  • SIMS
  • Ti-in-zircon geothermometry
  • U-Pb geochronology
  • zircon

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Nasdala, L., Corfu, F., Schoene, B., Tapster, S. R., Wall, C. J., Schmitz, M. D., ... Giester, G. (2018). GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology. Geostandards and Geoanalytical Research, 42(4), 431-457. https://doi.org/10.1111/ggr.12239

GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology. / Nasdala, Lutz; Corfu, Fernando; Schoene, Blair; Tapster, Simon R.; Wall, Corey J.; Schmitz, Mark D.; Ovtcharova, Maria; Schaltegger, Urs; Kennedy, Allen K.; Kronz, Andreas; Reiners, Peter W; Yang, Yue Heng; Wu, Fu Yuan; Gain, Sarah E.M.; Griffin, William L.; Szymanowski, Dawid; Chanmuang N., Chutimun; Ende, Martin; Valley, John W.; Spicuzza, Michael J.; Wanthanachaisaeng, Bhuwadol; Giester, Gerald.

In: Geostandards and Geoanalytical Research, Vol. 42, No. 4, 01.12.2018, p. 431-457.

Research output: Contribution to journalArticle

Nasdala, L, Corfu, F, Schoene, B, Tapster, SR, Wall, CJ, Schmitz, MD, Ovtcharova, M, Schaltegger, U, Kennedy, AK, Kronz, A, Reiners, PW, Yang, YH, Wu, FY, Gain, SEM, Griffin, WL, Szymanowski, D, Chanmuang N., C, Ende, M, Valley, JW, Spicuzza, MJ, Wanthanachaisaeng, B & Giester, G 2018, 'GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology', Geostandards and Geoanalytical Research, vol. 42, no. 4, pp. 431-457. https://doi.org/10.1111/ggr.12239
Nasdala L, Corfu F, Schoene B, Tapster SR, Wall CJ, Schmitz MD et al. GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology. Geostandards and Geoanalytical Research. 2018 Dec 1;42(4):431-457. https://doi.org/10.1111/ggr.12239
Nasdala, Lutz ; Corfu, Fernando ; Schoene, Blair ; Tapster, Simon R. ; Wall, Corey J. ; Schmitz, Mark D. ; Ovtcharova, Maria ; Schaltegger, Urs ; Kennedy, Allen K. ; Kronz, Andreas ; Reiners, Peter W ; Yang, Yue Heng ; Wu, Fu Yuan ; Gain, Sarah E.M. ; Griffin, William L. ; Szymanowski, Dawid ; Chanmuang N., Chutimun ; Ende, Martin ; Valley, John W. ; Spicuzza, Michael J. ; Wanthanachaisaeng, Bhuwadol ; Giester, Gerald. / GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology. In: Geostandards and Geoanalytical Research. 2018 ; Vol. 42, No. 4. pp. 431-457.
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AU - Nasdala, Lutz

AU - Corfu, Fernando

AU - Schoene, Blair

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AU - Wall, Corey J.

AU - Schmitz, Mark D.

AU - Ovtcharova, Maria

AU - Schaltegger, Urs

AU - Kennedy, Allen K.

AU - Kronz, Andreas

AU - Reiners, Peter W

AU - Yang, Yue Heng

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AU - Ende, Martin

AU - Valley, John W.

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