The Diamantina monazite : a new Low‐Th reference material for microanalysis.
dc.contributor.author | Gonçalves, Guilherme de Oliveira | |
dc.contributor.author | Lana, Cristiano de Carvalho | |
dc.contributor.author | Cipriano, Ricardo Augusto Scholz | |
dc.contributor.author | Buick, Ian S. | |
dc.contributor.author | Gerdes, Axel | |
dc.contributor.author | Kamo, Sandra L. | |
dc.contributor.author | Corfu, Fernando | |
dc.contributor.author | Rubatto, Daniela | |
dc.contributor.author | Wiedenbeck, Michael | |
dc.contributor.author | Nalini Júnior, Hermínio Arias | |
dc.contributor.author | Oliveira, Luiz Carlos Alves de | |
dc.date.accessioned | 2018-09-12T15:10:44Z | |
dc.date.available | 2018-09-12T15:10:44Z | |
dc.date.issued | 2018 | |
dc.description.abstract | Most 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. | pt_BR |
dc.identifier.citation | GONÇALVES, G. de O. et al. The Diamantina monazite : a new Low‐Th reference material for microanalysis. Geostandards And Geoanalytical Research, v. 22, n. 1, p. 25-47, 2018. Disponível em: <https://onlinelibrary.wiley.com/doi/abs/10.1111/ggr.12192>. Acesso em: 03 mai. 2018. | pt_BR |
dc.identifier.issn | 1751908X | |
dc.identifier.uri | http://www.repositorio.ufop.br/handle/123456789/10181 | |
dc.identifier.uri2 | https://onlinelibrary.wiley.com/doi/abs/10.1111/ggr.12192 | pt_BR |
dc.language.iso | en_US | pt_BR |
dc.rights | restrito | pt_BR |
dc.subject | U-Pb geochronology | pt_BR |
dc.subject | Sm-Nd | pt_BR |
dc.subject | Oxygen isotopes | pt_BR |
dc.subject | Araçuaí orogen. | pt_BR |
dc.title | The Diamantina monazite : a new Low‐Th reference material for microanalysis. | pt_BR |
dc.type | Artigo publicado em periodico | pt_BR |
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