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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.
Authors: Santos, Maristella Moreira
Lana, Cristiano de Carvalho
Buick, Ian S.
Schmitz, Mark D.
Kamo, Sandra L.
Gerdes, Axel
Corfu, Fernando
Tapster, Simon
Lancaster, Penelope
Storey, Craig Darryl
Basei, Miguel Ângelo Stipp
Tohver, Eric
Alkmim, Ana Ramalho
Nalini Júnior, Hermínio Arias
Krambrock, Klaus Wilhelm Heinrich
Leite, Cristiano Fantini
Wiedenbeck, Michael
Keywords: Sri Lankan reference material
Rare earth elements
Issue Date: 2017
Citation: SANTOS, M. M. et al. 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, v. 41, p. 335-358, 2017. Disponível em: <>. Acesso em: 25 ago. 2017.
Abstract: A potential zircon reference material (BB zircon) for laser abla tion-in ductively coupled plasma-mass spectrometry (LA-ICP-M S)U-Pb geochronology and Hf isotope geochemistry is described. A batch of twenty zircon megacrysts (0.5–1.5 cm3) from SriLanka was studied. Within-grain rare earth element (REE) compositions are largely homogeneous, albeit with somevariation 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 lgg-1and the average Th/U ratios werebetween 0.20 and 0.47. The Hf isotope composition (0.56–0.84 g/100 g Hf) is homogeneous within and between thegrains – mean176Hf/177Hf of 0.281674 ± 0.000018 (2s). The calculated alpha dose of 0.59 3 1018g-1for a numberof BB grains falls within the trend of previously studied, untreated zircon samples from Sri Lanka. Aliquots of the samecrystal (analysed by ID-TIMS in four different laboratories) gave consistent U-Pb ages with excellent measurementreproducibility (0.1–0.4% RSD). Interlaboratory assessment (by LA-ICP-MS) from individual crystals returned results that arewithin uncertainty equivalent to the TIMS ages. Finally, we report on within- and between-grain homogeneity of theoxygen isotope systematic of four BB crystals (13.16‰ VSMOW).
ISSN: 1751-908X
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