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; Bhuwadol Wanthanachaisaeng; Gerald Giester

doi:10.1111/ggr.12239

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. SpicuzzaBhuwadol Wanthanachaisaeng, Gerald Giester

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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 language	English (US)
Pages (from-to)	431-457
Number of pages	27
Journal	Geostandards and Geoanalytical Research
Volume	42
Issue number	4
DOIs	https://doi.org/10.1111/ggr.12239
State	Published - Dec 2018

All Science Journal Classification (ASJC) codes

Geology
Geochemistry and Petrology

Keywords

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

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10.1111/ggr.12239

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Nasdala, L., Corfu, F., Schoene, B., Tapster, S. R., Wall, C. J., Schmitz, M. D., Ovtcharova, M., Schaltegger, U., Kennedy, A. K., Kronz, A., Reiners, P. W., Yang, Y. H., Wu, F. Y., Gain, S. E. M., Griffin, W. L., Szymanowski, D., Chanmuang N., C., Ende, M., Valley, J. W., ... 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

@article{59faa23b25fb41d4a2930bae6446bca4,

title = "GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology",

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.",

keywords = "SIMS, Ti-in-zircon geothermometry, U-Pb geochronology, reference material, zircon",

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

note = "Publisher Copyright: {\textcopyright} 2018 The Authors. Geostandards and Geoanalytical Research published by John Wiley & Sons Ltd on behalf of International Association of Geoanalysts",

year = "2018",

month = dec,

doi = "10.1111/ggr.12239",

language = "English (US)",

volume = "42",

pages = "431--457",

journal = "Geostandards and Geoanalytical Research",

issn = "1639-4488",

publisher = "Wiley-Blackwell",

number = "4",

}

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

TY - JOUR

T1 - GZ7 and GZ8 – Two Zircon Reference Materials for SIMS U-Pb Geochronology

AU - Nasdala, Lutz

AU - Corfu, Fernando

AU - Schoene, Blair

AU - Tapster, Simon R.

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

AU - Wu, Fu Yuan

AU - Gain, Sarah E.M.

AU - Griffin, William L.

AU - Szymanowski, Dawid

AU - Chanmuang N., Chutimun

AU - Ende, Martin

AU - Valley, John W.

AU - Spicuzza, Michael J.

AU - Wanthanachaisaeng, Bhuwadol

AU - Giester, Gerald

PY - 2018/12

Y1 - 2018/12

N2 - 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.

AB - 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.

KW - SIMS

KW - Ti-in-zircon geothermometry

KW - U-Pb geochronology

KW - reference material

KW - zircon

UR - http://www.scopus.com/inward/record.url?scp=85054508859&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054508859&partnerID=8YFLogxK

U2 - 10.1111/ggr.12239

DO - 10.1111/ggr.12239

M3 - Article

C2 - 30686958

AN - SCOPUS:85054508859

SN - 1639-4488

VL - 42

SP - 431

EP - 457

JO - Geostandards and Geoanalytical Research

JF - Geostandards and Geoanalytical Research

IS - 4

ER -

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

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