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

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., 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

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Santos, Maristella M.1, Autor
Lana, Cristiano1, Autor
Scholz, Ricardo1, Autor
Buick, Ian1, Autor
Schmitz, Mark D.1, Autor
Kamo, Sandra L.1, Autor
Gerdes, Axel1, Autor
Corfu, Fernando1, Autor
Tapster, Simon1, Autor
Lancaster, Penelope1, Autor
Storey, Craig D.1, Autor
Basei, Miguel A.S.1, Autor
Tohver, Eric1, Autor
Alkmim, Ana1, Autor
Nalini, Herminio1, Autor
Krambrock, Klaus1, Autor
Fantini, Cristiano1, Autor
Wiedenbeck, Michael2, Autor              
GFZ SIMS Publications, Deutsches GeoForschungsZentrum, Autor              
Affiliations:
1External Organizations, ou_persistent22              
23.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              

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 Zusammenfassung: 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).

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 Datum: 2017
 Publikationsstatus: Final veröffentlicht
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Titel: Geostandards and Geoanalytical Research
Genre der Quelle: Zeitschrift, SCI, Scopus
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Seiten: - Band / Heft: 41 (3) Artikelnummer: - Start- / Endseite: 335 - 358 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals187