Lana, Cristiano de CarvalhoGonçalves, Guilherme de OliveiraMazoz, Ariela OliveiraBuick, Ian S.Kamo, Sandra L.Cipriano, Ricardo Augusto ScholzWang, HaoMoreira, Hugo SouzaBabinski, MarlyQueiroga, Gláucia Nascimento2022-09-132022-09-132022LANA, 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. 2022.1751-908Xhttp://www.repositorio.ufop.br/jspui/handle/123456789/15258This 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.en-USrestritoGeochronologyLaser ablationInductively coupled plasma mass spectrometryArtigo publicado em periodicohttps://onlinelibrary.wiley.com/doi/full/10.1111/ggr.12413https://doi.org/10.1111/ggr.12413