Optimization of the in-situ U-Pb age dating method via LA-Quadrupole-ICP-MS with applications to the timing of U-Zr-Mo mineralization in the Poços de Caldas Alkaline Complex, SE Brazil.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorTakenaka, Lynthener Bianca-
Autor(es): dc.creatorLana, Cristiano de Carvalho-
Autor(es): dc.creatorScholz, Ricardo Augusto-
Autor(es): dc.creatorNalini Júnior, Hermínio Arias-
Autor(es): dc.creatorAbreu, Adriana Trópia de-
Data de aceite: dc.date.accessioned2019-11-06T13:35:50Z-
Data de disponibilização: dc.date.available2019-11-06T13:35:50Z-
Data de envio: dc.date.issued2016-01-15-
Data de envio: dc.date.issued2016-01-15-
Data de envio: dc.date.issued2015-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/6070-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/559007-
Descrição: dc.descriptionThe high spatial resolution of the LA-ICP-MS systems allows rapid extraction of vital isotopic information from individual growth zones of minerals. This paper describes in detail the optimization of a relatively inexpensive LA-ICP-MS system consisting of a UV 213 Laser Ablation and a Quadrupole ICP-MS. The results of optimization take into account laser energy, beam diameter, frequency and ICP-MS gas conditions. The optimized conditions were tested for precision and accuracy on a number of wellcharacterized zircons, commonly used as primary and secondary quality control standards. The acquisition of the U-Pb data is carried out in automated mode (pre-set points) for up to 12 h/day with only minimal operator presence. Individual U-Pb zircon analysis lasts 80 s. The 2s uncertainties of the standards ranged between 1.4 and 8.2%, and overall their relative deviations ranged from 0.02 to 0.87%. The results are comparable to techniques that use more complex and time-consuming approaches such as LA-MC-ICP-MS and ion-microprobe. We have applied this method to obtain ages of numerous granitoid rocks from the Southern São Francisco Craton and a well-known Archean granitoid of the Kaapvaal Craton, South Africa. We furthermore provide the first results of U-Pb age dating of U-Zr-Mo mineralization in the Poços de Caldas Alkaline Complex, SE Brazil, with a U-Pb age of 85 ± 3 Ma for zircon-bearing hydrothermal veins.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Journal of South American Earth Sciences concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3727581076900-
Palavras-chave: dc.subjectPoços de Caldas alkaline complex-
Palavras-chave: dc.subjectZircon-
Título: dc.titleOptimization of the in-situ U-Pb age dating method via LA-Quadrupole-ICP-MS with applications to the timing of U-Zr-Mo mineralization in the Poços de Caldas Alkaline Complex, SE Brazil.-
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