U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Anais da Academia Brasileira de Ciências (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005 |
Resumo: | The LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion factors and the highly suitable GJ-1 standard zircon for external calibrations were of paramount importance for obtaining reliable results. All age results were concordant within the experimental errors. The assigned age errors using the LA-MC-ICP-MS technique were, in most cases, higher than those obtained by SHRIMP, but if we are not faced with a high resolution stratigraphy, the laser technique has certain advantages. |
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U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configurationMC-ICP-MSSHRIMPFaraday cupsMulti-ion Counting SystemU-Pb in situ zircon datingThe LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion factors and the highly suitable GJ-1 standard zircon for external calibrations were of paramount importance for obtaining reliable results. All age results were concordant within the experimental errors. The assigned age errors using the LA-MC-ICP-MS technique were, in most cases, higher than those obtained by SHRIMP, but if we are not faced with a high resolution stratigraphy, the laser technique has certain advantages.Academia Brasileira de Ciências2012-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005Anais da Academia Brasileira de Ciências v.84 n.2 2012reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652012005000032info:eu-repo/semantics/openAccessChemale Jr,FaridKawashita,KojiDussin,Ivo A.Ávila,Janaína N.Justino,DayvissonBertotti,Aneliseeng2012-05-25T00:00:00Zoai:scielo:S0001-37652012000200005Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2012-05-25T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false |
dc.title.none.fl_str_mv |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
title |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
spellingShingle |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration Chemale Jr,Farid MC-ICP-MS SHRIMP Faraday cups Multi-ion Counting System U-Pb in situ zircon dating |
title_short |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
title_full |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
title_fullStr |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
title_full_unstemmed |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
title_sort |
U-Pb zircon in situ dating with LA-MC-ICP-MS using a mixed detector configuration |
author |
Chemale Jr,Farid |
author_facet |
Chemale Jr,Farid Kawashita,Koji Dussin,Ivo A. Ávila,Janaína N. Justino,Dayvisson Bertotti,Anelise |
author_role |
author |
author2 |
Kawashita,Koji Dussin,Ivo A. Ávila,Janaína N. Justino,Dayvisson Bertotti,Anelise |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Chemale Jr,Farid Kawashita,Koji Dussin,Ivo A. Ávila,Janaína N. Justino,Dayvisson Bertotti,Anelise |
dc.subject.por.fl_str_mv |
MC-ICP-MS SHRIMP Faraday cups Multi-ion Counting System U-Pb in situ zircon dating |
topic |
MC-ICP-MS SHRIMP Faraday cups Multi-ion Counting System U-Pb in situ zircon dating |
description |
The LA-MC-ICP-MS method applied to U-Pb in situ dating is still rapidly evolving due to improvements in both lasers and ICP-MS. To test the validity and reproducibility of the method, 5 different zircon samples, including the standard Temora-2, ranging in age between 2.2 Ga and 246 Ma, were dated using both LA-MC-ICP-MS and SHRIMP. The selected zircons were dated by SHRIMP and, after gentle polishing, the laser spot was driven to the same site or on the same zircon phase with a 213 nm laser microprobe coupled to a multi-collector mixed system. The data were collected with a routine spot size of 25 μm and, in some cases, of 15 and 40 μm. A careful cross-calibration using a diluted U-Th-Pb solution to calculate the Faraday reading to counting rate conversion factors and the highly suitable GJ-1 standard zircon for external calibrations were of paramount importance for obtaining reliable results. All age results were concordant within the experimental errors. The assigned age errors using the LA-MC-ICP-MS technique were, in most cases, higher than those obtained by SHRIMP, but if we are not faced with a high resolution stratigraphy, the laser technique has certain advantages. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000200005 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0001-37652012005000032 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Academia Brasileira de Ciências |
publisher.none.fl_str_mv |
Academia Brasileira de Ciências |
dc.source.none.fl_str_mv |
Anais da Academia Brasileira de Ciências v.84 n.2 2012 reponame:Anais da Academia Brasileira de Ciências (Online) instname:Academia Brasileira de Ciências (ABC) instacron:ABC |
instname_str |
Academia Brasileira de Ciências (ABC) |
instacron_str |
ABC |
institution |
ABC |
reponame_str |
Anais da Academia Brasileira de Ciências (Online) |
collection |
Anais da Academia Brasileira de Ciências (Online) |
repository.name.fl_str_mv |
Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC) |
repository.mail.fl_str_mv |
||aabc@abc.org.br |
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1754302858842341376 |