GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology
© 2018 The Authors. Geostandards and Geoanalytical Research published by John Wiley & Sons Ltd on behalf of International Association of Geoanalysts 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; b...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Wiley-Blackwell Publishing
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/71379 |
| _version_ | 1848762464082067456 |
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| author | Nasdala, L. Corfu, F. Schoene, B. Tapster, S. Wall, C. Schmitz, M. Ovtcharova, M. Schaltegger, U. Kennedy, Allen Kronz, A. Reiners, P. Yang, Y. Wu, F. Gain, S. Griffin, W. Szymanowski, D. Chanmuang, C. Ende, M. Valley, J. Spicuzza, M. Wanthanachaisaeng, B. Giester, G. |
| author_facet | Nasdala, L. Corfu, F. Schoene, B. Tapster, S. Wall, C. Schmitz, M. Ovtcharova, M. Schaltegger, U. Kennedy, Allen Kronz, A. Reiners, P. Yang, Y. Wu, F. Gain, S. Griffin, W. Szymanowski, D. Chanmuang, C. Ende, M. Valley, J. Spicuzza, M. Wanthanachaisaeng, B. Giester, G. |
| author_sort | Nasdala, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2018 The Authors. Geostandards and Geoanalytical Research published by John Wiley & Sons Ltd on behalf of International Association of Geoanalysts 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 mean206Pb/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. |
| first_indexed | 2025-11-14T10:47:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-71379 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:47:59Z |
| publishDate | 2018 |
| publisher | Wiley-Blackwell Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-713792019-03-11T01:34:08Z GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology Nasdala, L. Corfu, F. Schoene, B. Tapster, S. Wall, C. Schmitz, M. Ovtcharova, M. Schaltegger, U. Kennedy, Allen Kronz, A. Reiners, P. Yang, Y. Wu, F. Gain, S. Griffin, W. Szymanowski, D. Chanmuang, C. Ende, M. Valley, J. Spicuzza, M. Wanthanachaisaeng, B. Giester, G. © 2018 The Authors. Geostandards and Geoanalytical Research published by John Wiley & Sons Ltd on behalf of International Association of Geoanalysts 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 mean206Pb/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. 2018 Journal Article http://hdl.handle.net/20.500.11937/71379 10.1111/ggr.12239 Wiley-Blackwell Publishing fulltext |
| spellingShingle | Nasdala, L. Corfu, F. Schoene, B. Tapster, S. Wall, C. Schmitz, M. Ovtcharova, M. Schaltegger, U. Kennedy, Allen Kronz, A. Reiners, P. Yang, Y. Wu, F. Gain, S. Griffin, W. Szymanowski, D. Chanmuang, C. Ende, M. Valley, J. Spicuzza, M. Wanthanachaisaeng, B. Giester, G. GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title | GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title_full | GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title_fullStr | GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title_full_unstemmed | GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title_short | GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology |
| title_sort | gz7 and gz8 – two zircon reference materials for sims u-pb geochronology |
| url | http://hdl.handle.net/20.500.11937/71379 |