Titre:	Khan river and bear lake : two natural titanite reference materials for high-spatial resolution u-pb microanalysis
Auteur(s):	Mazoz, Ariela Gonçalves, Guilherme O. Lana, Cristiano Buick, Ian S. Corfu, Fernando Kamo, Sandra L. Wang, Hao Yang, Yue-Heng Scholz, Ricardo Queiroga, Gláucia Fu, Bin Martins, Lorena Schannor, Mathias Abreu, Adriana Trópia de Babinski, Marly Peixoto, Eliza Santos, Roberto Ventura
metadata.dc.contributor.email:	mailto:arielamazoz.1818@gmail.com
metadata.dc.identifier.orcid:	https://orcid.org/0000-0002-2423-4149 https://orcid.org/0000-0001-6347-0374 https://orcid.org/0000-0001-6302-9706 https://orcid.org/0000-0002-9370-4239 https://orcid.org/0000-0002-0021-7563 https://orcid.org/0000-0002-2504-1111
Assunto::	LA-ICP-MS Sm-Nd Titanita
Date de publication:	13-jui-2022
Editeur:	International Association of Geoanalysts
Référence bibliographique:	MAZOZ, Ariela et al. Khan river and bear lake: two natural titanite reference materials for high-spatial resolution u-pb microanalysis. Geostandards and Geoanalytical Research, 2022. DOI 10.1111/ggr.12444. Disponível em: https://onlinelibrary.wiley.com/doi/full/10.1111/ggr.12444. Acesso em: 15 set. 2022.
Abstract:	The Khan River (Namibia) and Bear Lake (Canada) titanites are investigated as potential reference materials (RM) for LA-ICP-MS applications. The Bear Lake titanite is texturally and compositionally homogeneous. The Khan River titanite is texturally heterogeneous and characterised by variable trace element compositions and total rare earth element contents. However, both titanites have consistent U-Pb and Nd-isotope ratios. U-Pb isotope dilution-thermal ionisation mass spectrometry analyses yielded Pbc-uncorrected intercept ages of 516.3 ± 1.3 Ma (2s, n = 5, MSWD = 2.4) and 1067.81 ± 0.74 Ma (2s, n = 4, MSWD = 0.35) for Khan River and Bear Lake titanites, respectively. Multiple U-Pb LA-SF/MC-ICP-MS analyses gave consistent Pbc-uncorrected intercept ages for both, Khan River (517 ± 1/5 Ma, 2s, n = 262, MSWD = 1.5) and Bear Lake (1070 ± 1/11 Ma, 2s, n = 325, MSWD = 0.88). U-Pb SHRIMP analyses on the same material returned identical (within uncertainty) ages. Khan River and Bear Lake gave internally consistent solution MC-ICP-MS 143Nd/144Nd ratios of 0.511587 ± 0.000027 (2s, n = 2) and 0.512321 ± 0.000004 (2s, n = 2), respectively. The 143Nd/144Nd ratios via solution-MC-ICP-MS and LA-ICP-MS all agree within uncertainty and suggest that both titanites can be used as RMs for Nd-isotope analyses.
DOI:	https://doi.org/10.1111/ggr.12444
Collection(s) :	Artigos publicados em periódicos e afins

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