In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP
ABSTRACT: This contribution describes the successful implementation of in situ Sr isotope analyses by LA-MC-ICP-MS at the CPGeo-USP. The choice for an analytical configuration using measurements of half-masses allows the accurate assessment of lanthanide interferences, permitting the determination o...
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| Format: | Article |
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Sociedade Brasileira de Geologia
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| Series: | Brazilian Journal of Geology |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892016000700227&lng=en&tlng=en |
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| author | Patricio Montecinos Munoz Adriana Alves Rogério Guitarrari Azzone Pablo Cordenons Sandra Morano Walter Sproesser Solange de Souza |
| author_facet | Patricio Montecinos Munoz Adriana Alves Rogério Guitarrari Azzone Pablo Cordenons Sandra Morano Walter Sproesser Solange de Souza |
| author_sort | Patricio Montecinos Munoz |
| collection | DOAJ |
| description | ABSTRACT: This contribution describes the successful implementation of in situ Sr isotope analyses by LA-MC-ICP-MS at the CPGeo-USP. The choice for an analytical configuration using measurements of half-masses allows the accurate assessment of lanthanide interferences, permitting the determination of Sr isotopes in important REE-rich accessory phases, such as apatite. Likewise, the on-peak-zero method effectively corrects the background contribution (both from Kr and residual Sr contributions from previous ablations) to the signals of the unknown samples. The analytical campaigns resulted in an accuracy, in respect to reference TIMS values, better than 57 ppm (~ ±0.000057 2σ SD) for a modern coral and the Batjberg clinopyroxene which impart significant quality to our data. Similarly, the majority of the stable Sr isotope ratios are close to the accepted values, which also confirms the effectiveness of the method. The achieved accuracy allows the identification and investigation of spatially-controlled isotopic heterogeneities on the micrometric scale in several Sr-rich minerals (apatite, carbonates, plagioclase, and clinopyroxene) with important implications to the understanding of relevant geochemical processes, particularly AFC, source geochemical heterogeneities and magma-mixing. |
| first_indexed | 2024-12-10T06:57:55Z |
| format | Article |
| id | doaj.art-85dffbbbb4894d2fb3311fc75fcf12c2 |
| institution | Directory Open Access Journal |
| issn | 2317-4692 |
| language | English |
| last_indexed | 2024-12-10T06:57:55Z |
| publisher | Sociedade Brasileira de Geologia |
| record_format | Article |
| series | Brazilian Journal of Geology |
| spelling | doaj.art-85dffbbbb4894d2fb3311fc75fcf12c22022-12-22T01:58:24ZengSociedade Brasileira de GeologiaBrazilian Journal of Geology2317-469246suppl 122724310.1590/2317-488920160032093S2317-48892016000700227In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USPPatricio Montecinos MunozAdriana AlvesRogério Guitarrari AzzonePablo CordenonsSandra MoranoWalter SproesserSolange de SouzaABSTRACT: This contribution describes the successful implementation of in situ Sr isotope analyses by LA-MC-ICP-MS at the CPGeo-USP. The choice for an analytical configuration using measurements of half-masses allows the accurate assessment of lanthanide interferences, permitting the determination of Sr isotopes in important REE-rich accessory phases, such as apatite. Likewise, the on-peak-zero method effectively corrects the background contribution (both from Kr and residual Sr contributions from previous ablations) to the signals of the unknown samples. The analytical campaigns resulted in an accuracy, in respect to reference TIMS values, better than 57 ppm (~ ±0.000057 2σ SD) for a modern coral and the Batjberg clinopyroxene which impart significant quality to our data. Similarly, the majority of the stable Sr isotope ratios are close to the accepted values, which also confirms the effectiveness of the method. The achieved accuracy allows the identification and investigation of spatially-controlled isotopic heterogeneities on the micrometric scale in several Sr-rich minerals (apatite, carbonates, plagioclase, and clinopyroxene) with important implications to the understanding of relevant geochemical processes, particularly AFC, source geochemical heterogeneities and magma-mixing.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892016000700227&lng=en&tlng=enAblação a laserSpectrometria de massa acoplada a ICPInterferências isobáricasDeterminações isotópicas de Sr |
| spellingShingle | Patricio Montecinos Munoz Adriana Alves Rogério Guitarrari Azzone Pablo Cordenons Sandra Morano Walter Sproesser Solange de Souza In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP Brazilian Journal of Geology Ablação a laser Spectrometria de massa acoplada a ICP Interferências isobáricas Determinações isotópicas de Sr |
| title | In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP |
| title_full | In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP |
| title_fullStr | In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP |
| title_full_unstemmed | In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP |
| title_short | In situ Sr isotope analyses by LA-MC-ICP-MS of igneous apatite and plagioclase from magmatic rocks at the CPGeo-USP |
| title_sort | in situ sr isotope analyses by la mc icp ms of igneous apatite and plagioclase from magmatic rocks at the cpgeo usp |
| topic | Ablação a laser Spectrometria de massa acoplada a ICP Interferências isobáricas Determinações isotópicas de Sr |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2317-48892016000700227&lng=en&tlng=en |
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