The Diamantina monazite : a new Low‐Th reference material for microanalysis.

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Autor(es): dc.creatorGonçalves, Guilherme de Oliveira-
Autor(es): dc.creatorLana, Cristiano de Carvalho-
Autor(es): dc.creatorCipriano, Ricardo Augusto Scholz-
Autor(es): dc.creatorBuick, Ian S.-
Autor(es): dc.creatorGerdes, Axel-
Autor(es): dc.creatorKamo, Sandra L.-
Autor(es): dc.creatorCorfu, Fernando-
Autor(es): dc.creatorRubatto, Daniela-
Autor(es): dc.creatorWiedenbeck, Michael-
Autor(es): dc.creatorNalini Júnior, Hermínio Arias-
Autor(es): dc.creatorOliveira, Luiz Carlos Alves de-
Data de aceite: dc.date.accessioned2025-08-21T15:22:41Z-
Data de disponibilização: dc.date.available2025-08-21T15:22:41Z-
Data de envio: dc.date.issued2018-09-12-
Data de envio: dc.date.issued2018-09-12-
Data de envio: dc.date.issued2018-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/10181-
Fonte completa do material: dc.identifierhttps://onlinelibrary.wiley.com/doi/abs/10.1111/ggr.12192-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1012468-
Descrição: dc.descriptionMost monazite reference materials (RMs) for in situ U-Pb geochronology are rich in Th; however, many hydrothermal ore deposits contain monazite that is low in trace element contents, including Th, U and Pb. Because of potential problems with matrix effects and the lack of appropriate matrix-matched RMs, such variations can bias dating of hydrothermal deposits. In this paper, we describe a polycrystalline low-U and low-Th Diamantina monazite from the Espinhac o Range, SE Brazil. It has a U-Pb ID-TIMS weighted mean 207Pb*/235U ratio of 0.62913 ± 0.00079, 206Pb*/238U of 0.079861 ± 0.000088 and 207Pb*/206Pb* of 0.057130 ± 0.000031, yielding a weighted mean 206Pb*/238U date of 495.26 ± 0.54 Ma (95% c.l.). In situ dates acquired with different methods (LA-(Q, SF, MC)-ICP-MS and SIMS) are within uncertainty of the ID-TIMS data. U-Pb LA-(Q, MC)-ICP-MS runs, using Diamantina as a primary RM, reproduced the ages of other established RMs within < 1% deviation. The LA-MC-ICP-MS analyses yielded homogeneous Sm-Nd isotopic compositions (143Nd/144Nd = 0.511427 ± 23, 2s; 147Sm/144Nd = 0.1177 ± 13, 2s) and eNd(495 Ma) of -18.7 ± 0.5 (2s). SIMS oxygen isotope determinations showed measurement reproducibility better than ± 0.3‰ (2s), confirming Diamantina’s relative homogeneity at test portion masses below 1 ng.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectU-Pb geochronology-
Palavras-chave: dc.subjectSm-Nd-
Palavras-chave: dc.subjectOxygen isotopes-
Palavras-chave: dc.subjectAraçuaí orogen.-
Título: dc.titleThe Diamantina monazite : a new Low‐Th reference material for microanalysis.-
Aparece nas coleções:Repositório Institucional - UFOP

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