A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing

Maristella M. Santos; Cristiano Lana; Ricardo Scholz; Ian Buick; Mark D. Schmitz; Sandra L. Kamo; Axel Gerdes; Fernando Corfu; Simon Tapster; Penelope Lancaster; Craig D. Storey; Miguel A.S. Basei; Eric Tohver; Ana Alkmim; Herminio Nalini; Klaus Krambrock; Cristiano Fantini; Michael Wiedenbeck

doi:10.1111/ggr.12167

A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing

Maristella M. Santos, Cristiano Lana, Ricardo Scholz, Ian Buick, Mark D. Schmitz, Sandra L. Kamo, Axel Gerdes, Fernando Corfu, Simon Tapster, Penelope Lancaster, Craig D. Storey, Miguel A.S. Basei, Eric Tohver, Ana Alkmim, Herminio Nalini, Klaus Krambrock, Cristiano Fantini, Michael Wiedenbeck

Geosciences Department

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170 Scopus citations

Abstract

A potential zircon reference material (BB zircon) for laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb geochronology and Hf isotope geochemistry is described. A batch of twenty zircon megacrysts (0.5–1.5 cm³) from Sri Lanka was studied. Within-grain rare earth element (REE) compositions are largely homogeneous, albeit with some variation seen between fractured and homogeneous domains. Excluding fractured cathodoluminescence bright domains, the variation in U content for all analysed crystals ranged from 227 to 368 μg g⁻¹ and the average Th/U ratios were between 0.20 and 0.47. The Hf isotope composition (0.56–0.84 g/100 g Hf) is homogeneous within and between the grains – mean ¹⁷⁶Hf/¹⁷⁷Hf of 0.281674 ± 0.000018 (2s). The calculated alpha dose of 0.59 × 10¹⁸ g⁻¹ for a number of BB grains falls within the trend of previously studied, untreated zircon samples from Sri Lanka. Aliquots of the same crystal (analysed by ID-TIMS in four different laboratories) gave consistent U-Pb ages with excellent measurement reproducibility (0.1–0.4% RSD). Interlaboratory assessment (by LA-ICP-MS) from individual crystals returned results that are within uncertainty equivalent to the TIMS ages. Finally, we report on within- and between-grain homogeneity of the oxygen isotope systematic of four BB crystals (13.16‰ VSMOW).

Original language	English
Pages (from-to)	335-358
Number of pages	24
Journal	Geostandards and Geoanalytical Research
Volume	41
Issue number	3
DOIs	https://doi.org/10.1111/ggr.12167
State	Published - Sep 2017

Keywords

BB zircon
Hf isotope system
LA-ICP-MS
Sri Lankan reference material
U-Pb geochronology
rare earth elements

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10.1111/ggr.12167

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Santos, M. M., Lana, C., Scholz, R., Buick, I., Schmitz, M. D., Kamo, S. L., Gerdes, A., Corfu, F., Tapster, S., Lancaster, P., Storey, C. D., Basei, M. A. S., Tohver, E., Alkmim, A., Nalini, H., Krambrock, K., Fantini, C., & Wiedenbeck, M. (2017). A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing. Geostandards and Geoanalytical Research, 41(3), 335-358. https://doi.org/10.1111/ggr.12167

@article{46ea91c969804a019884d46e747827d7,

title = "A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing",

abstract = "A potential zircon reference material (BB zircon) for laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb geochronology and Hf isotope geochemistry is described. A batch of twenty zircon megacrysts (0.5–1.5 cm3) from Sri Lanka was studied. Within-grain rare earth element (REE) compositions are largely homogeneous, albeit with some variation seen between fractured and homogeneous domains. Excluding fractured cathodoluminescence bright domains, the variation in U content for all analysed crystals ranged from 227 to 368 μg g−1 and the average Th/U ratios were between 0.20 and 0.47. The Hf isotope composition (0.56–0.84 g/100 g Hf) is homogeneous within and between the grains – mean 176Hf/177Hf of 0.281674 ± 0.000018 (2s). The calculated alpha dose of 0.59 × 1018 g−1 for a number of BB grains falls within the trend of previously studied, untreated zircon samples from Sri Lanka. Aliquots of the same crystal (analysed by ID-TIMS in four different laboratories) gave consistent U-Pb ages with excellent measurement reproducibility (0.1–0.4% RSD). Interlaboratory assessment (by LA-ICP-MS) from individual crystals returned results that are within uncertainty equivalent to the TIMS ages. Finally, we report on within- and between-grain homogeneity of the oxygen isotope systematic of four BB crystals (13.16‰ VSMOW).",

keywords = "BB zircon, Hf isotope system, LA-ICP-MS, Sri Lankan reference material, U-Pb geochronology, rare earth elements",

author = "Santos, {Maristella M.} and Cristiano Lana and Ricardo Scholz and Ian Buick and Schmitz, {Mark D.} and Kamo, {Sandra L.} and Axel Gerdes and Fernando Corfu and Simon Tapster and Penelope Lancaster and Storey, {Craig D.} and Basei, {Miguel A.S.} and Eric Tohver and Ana Alkmim and Herminio Nalini and Klaus Krambrock and Cristiano Fantini and Michael Wiedenbeck",

note = "Publisher Copyright: {\textcopyright} 2017 The Authors. Geostandards and Geoanalytical Research {\textcopyright} 2017 International Association of Geoanalysts",

year = "2017",

month = sep,

doi = "10.1111/ggr.12167",

language = "English",

volume = "41",

pages = "335--358",

number = "3",

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Santos, MM, Lana, C, Scholz, R, Buick, I, Schmitz, MD, Kamo, SL, Gerdes, A, Corfu, F, Tapster, S, Lancaster, P, Storey, CD, Basei, MAS, Tohver, E, Alkmim, A, Nalini, H, Krambrock, K, Fantini, C & Wiedenbeck, M 2017, 'A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing', Geostandards and Geoanalytical Research, vol. 41, no. 3, pp. 335-358. https://doi.org/10.1111/ggr.12167

TY - JOUR

T1 - A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing

AU - Santos, Maristella M.

AU - Lana, Cristiano

AU - Scholz, Ricardo

AU - Buick, Ian

AU - Schmitz, Mark D.

AU - Kamo, Sandra L.

AU - Gerdes, Axel

AU - Corfu, Fernando

AU - Tapster, Simon

AU - Lancaster, Penelope

AU - Storey, Craig D.

AU - Basei, Miguel A.S.

AU - Tohver, Eric

AU - Alkmim, Ana

AU - Nalini, Herminio

AU - Krambrock, Klaus

AU - Fantini, Cristiano

AU - Wiedenbeck, Michael

PY - 2017/9

Y1 - 2017/9

N2 - A potential zircon reference material (BB zircon) for laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb geochronology and Hf isotope geochemistry is described. A batch of twenty zircon megacrysts (0.5–1.5 cm3) from Sri Lanka was studied. Within-grain rare earth element (REE) compositions are largely homogeneous, albeit with some variation seen between fractured and homogeneous domains. Excluding fractured cathodoluminescence bright domains, the variation in U content for all analysed crystals ranged from 227 to 368 μg g−1 and the average Th/U ratios were between 0.20 and 0.47. The Hf isotope composition (0.56–0.84 g/100 g Hf) is homogeneous within and between the grains – mean 176Hf/177Hf of 0.281674 ± 0.000018 (2s). The calculated alpha dose of 0.59 × 1018 g−1 for a number of BB grains falls within the trend of previously studied, untreated zircon samples from Sri Lanka. Aliquots of the same crystal (analysed by ID-TIMS in four different laboratories) gave consistent U-Pb ages with excellent measurement reproducibility (0.1–0.4% RSD). Interlaboratory assessment (by LA-ICP-MS) from individual crystals returned results that are within uncertainty equivalent to the TIMS ages. Finally, we report on within- and between-grain homogeneity of the oxygen isotope systematic of four BB crystals (13.16‰ VSMOW).

AB - A potential zircon reference material (BB zircon) for laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb geochronology and Hf isotope geochemistry is described. A batch of twenty zircon megacrysts (0.5–1.5 cm3) from Sri Lanka was studied. Within-grain rare earth element (REE) compositions are largely homogeneous, albeit with some variation seen between fractured and homogeneous domains. Excluding fractured cathodoluminescence bright domains, the variation in U content for all analysed crystals ranged from 227 to 368 μg g−1 and the average Th/U ratios were between 0.20 and 0.47. The Hf isotope composition (0.56–0.84 g/100 g Hf) is homogeneous within and between the grains – mean 176Hf/177Hf of 0.281674 ± 0.000018 (2s). The calculated alpha dose of 0.59 × 1018 g−1 for a number of BB grains falls within the trend of previously studied, untreated zircon samples from Sri Lanka. Aliquots of the same crystal (analysed by ID-TIMS in four different laboratories) gave consistent U-Pb ages with excellent measurement reproducibility (0.1–0.4% RSD). Interlaboratory assessment (by LA-ICP-MS) from individual crystals returned results that are within uncertainty equivalent to the TIMS ages. Finally, we report on within- and between-grain homogeneity of the oxygen isotope systematic of four BB crystals (13.16‰ VSMOW).

KW - BB zircon

KW - Hf isotope system

KW - LA-ICP-MS

KW - Sri Lankan reference material

KW - U-Pb geochronology

KW - rare earth elements

UR - http://www.scopus.com/inward/record.url?scp=85018193678&partnerID=8YFLogxK

U2 - 10.1111/ggr.12167

DO - 10.1111/ggr.12167

M3 - Article

AN - SCOPUS:85018193678

SN - 1639-4488

VL - 41

SP - 335

EP - 358

JO - Geostandards and Geoanalytical Research

JF - Geostandards and Geoanalytical Research

IS - 3

ER -

A New Appraisal of Sri Lankan BB Zircon as a Reference Material for LA-ICP-MS U-Pb Geochronology and Lu-Hf Isotope Tracing

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