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

^*Corresponding author for this work

ARC Centre of Excellence for Core to Crust Fluid Systems (incorporation ARC National Key Centre for Geochemical evolution and Metallogeny of Continents (GEMOC))
Faculty of Science and Engineering

Research output: Contribution to journal › Article › peer-review

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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
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
Publication status	Published - Dec 2018

Bibliographical note

Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

Keywords

zircon
reference material
SIMS
U-Pb geochronology
Ti-in-zircon geothermometry
NATURAL ZIRCON
SINGLE ZIRCONS
HF ISOTOPE MEASUREMENTS
ENERGY-LEVELS
TI-IN-ZIRCON
MASS-SPECTROMETRY
LU-HF
RADIATION-DAMAGE
HALF-LIVES
HIGH-PRECISION

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10.1111/ggr.12239Licence: CC BY

Publisher version (open access)Final published version, 3.22 MBLicence: CC BY

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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{3c6b3ab1af134921b6b79f5e53b29220,

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 = "zircon, reference material, SIMS, U-Pb geochronology, Ti-in-zircon geothermometry, NATURAL ZIRCON, SINGLE ZIRCONS, HF ISOTOPE MEASUREMENTS, ENERGY-LEVELS, TI-IN-ZIRCON, MASS-SPECTROMETRY, LU-HF, RADIATION-DAMAGE, HALF-LIVES, HIGH-PRECISION",

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 Yue-Heng Yang and Fu-Yuan Wu 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 = "Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2018",

month = dec,

doi = "10.1111/ggr.12239",

language = "English",

volume = "42",

pages = "431--457",

journal = "Geostandards and Geoanalytical Research",

issn = "1639-4488",

publisher = "Wiley-Blackwell, Wiley",

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, Y-H, Wu, F-Y, 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

N1 - Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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 - zircon

KW - reference material

KW - SIMS

KW - U-Pb geochronology

KW - Ti-in-zircon geothermometry

KW - NATURAL ZIRCON

KW - SINGLE ZIRCONS

KW - HF ISOTOPE MEASUREMENTS

KW - ENERGY-LEVELS

KW - TI-IN-ZIRCON

KW - MASS-SPECTROMETRY

KW - LU-HF

KW - RADIATION-DAMAGE

KW - HALF-LIVES

KW - HIGH-PRECISION

UR - http://www.scopus.com/inward/record.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

Abstract

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Keywords

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