Assessing the U-Pb, Sm-Nd and Sr-Sr isotopic compositions of the sume apatite as a reference material for LA-ICP-MS analysis.
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Date
2022
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Abstract
This study has determined the trace element and the U-Pb, Sm-Nd and Sr-Sr isotope composition of the Sume apatite
(from NE Brazil) to assess its suitability as a primary/secondary reference material for LA-ICP-MS. Reproducibility tests
demonstrate that one batch (~ 100 g) of the Sume apatite (Sum e-570) is uniform in terms of Nd-Nd and U-Pb isotope
compositions. Bulk isotope dilution TIMS/ICP-MS and LA-MC-ICP-MS analyses confirm that the apatite is well suited for
use as quality control material for Nd isotopes and U-Pb geochronology. U-Pb ID-TIMS analyses yield weighted mean
ratios of 0.09211 0.00053 (2s; 206Pb*/238U) and 0.06120 0.00063 (2s; 207Pb*/206Pb*) and a weighted mean
206Pb*/238U date of 568 3 Ma (95% c.l.). U-Pb LA-(SF/MC)-ICP-MS runs using Sume-570 as a primary RM and
reproduces the dates of other established RMs within 1% deviation (except for Durango 2–4%). Major and trace element
abundances show that Sume-570 is a fluorapatite derived from a syenitic source. It also strongly shows LREE-enriched
chondrite-normalised REE patterns with significant negative Eu anomalies, due to crystallisation of plagioclase in the
residue.
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Keywords
Geochronology, Laser ablation, Inductively coupled plasma mass spectrometry
Citation
LANA, C. de C. et al. Assessing the U-Pb, Sm-Nd and Sr-Sr isotopic compositions of the sume apatite as a reference material for LA-ICP-MS analysis. Geostandards and Geoanalytical Research, v. 46, n. 1, p. 71-95, 2022. Disponível em: <https://onlinelibrary.wiley.com/doi/full/10.1111/ggr.12413>. Acesso em: 29 abr. 2022.