Accurate SIMS analysis of Ca in olivine based on high-energy doubly charged secondary ions (Articolo in rivista)

Type
Label
  • Accurate SIMS analysis of Ca in olivine based on high-energy doubly charged secondary ions (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/b108569g (literal)
Alternative label
  • Ottolini L.; (2002)
    Accurate SIMS analysis of Ca in olivine based on high-energy doubly charged secondary ions
    in Journal of analytical atomic spectrometry (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ottolini L.; (literal)
Pagina inizio
  • 280 (literal)
Pagina fine
  • 283 (literal)
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  • This paper, published in one of the most important magazines dealing with Analytical Spectroscopy, shows an elegant and straightforward application of the capabilities of Secondary Ion Mass Spectrometry in the field of Earth Sciences, and precisely in the micro-analysis and quantification of calcium (Ca) in the mineral olivine. This element plays an important role in the reconstruction of complex geological processes occurring at different ages on the micro-to-macro scale, for which it is necessary to quantify accurately the pressure-temperature paths for different rock types. The new procedure overcomes the analytical problems encountered with the electron microprobe (EMPA) and with the traditional but not routine SIMS methods involving high-mass resolution. It allows for a rapid, accurate analysis of Ca together with other trace-elements of interest in olivine, such as H, Li, Be B and heavy Rare Earth Elements (HREE), with a gain in the analytical time and sample material. (literal)
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  • 17 (literal)
Rivista
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  • Impact Factor 4,250 (literal)
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  • A SIMS procedure was developed to quantify Ca in the silicate matrix olivine, which involves 40Ca2+, 24Mg2+and/or 28Si2+(as matrix reference) high-energy ions. The adoption of reference elements Mg and/or Si at mass 12 and 14 (amu), respectively, does not introduce any bias since interferences were shown to be negligible at these mass numbers. Internal analytical repeatability of 40Ca2+/24Mg2+ or 40Ca2+ / 28Si2+ over 10 cycles is typically in the range 1.5-6% (as 1 Sigma k%, k = 10) for 500-20 ppm wt Ca, respectively. Reproducibility of 40Ca2+/24Mg2+ and 40Ca2+ / 28Si2+ ratios in the standards over three analytical sessions is better than 8% rel. (Mg reference) and 6% rel. (Si reference) (as 1 Sigma m%), respectively, where Sigma m represents the standard deviation of the mean. Moreover, Ca can be monitored at the same spot with other trace elements of interest in olivine, such as H, Li, B, HREE, generally studied as high-energy ions. An estimation of matrix effects (< 9% rel.) on Ca2+/Si2+ ionization in silicates not containing Fe has been derived by studying an anorthoclase standard whose chemical composition is significantly different from that of olivine (no Mg and Fe, 20.12 wt% Al2O3 and 66.44 wt% SiO2). With this procedure it is possible to get accurate, rapid and straightforward quantitative data for Ca in low-Ca silicates. Important applications are in geothermobarometry of silicate systems involving olivine coexisting with clinopyroxene phase. (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • CNR - Istituto di Geoscienze e Georisorse (IGG), Sezione di Pavia, Via Ferrata, 1, I-27100 Pavia, Italy (literal)
Titolo
  • Accurate SIMS analysis of Ca in olivine based on high-energy doubly charged secondary ions (literal)
Abstract
  • A SIMS procedure was developed to quantify Ca in the silicate matrix olivine, which involves 40Ca2+, 24Mg2+and/or 28Si2+(as matrix reference) high-energy ions. The adoption of reference elements Mg and/or Si at mass 12 and 14 (amu), respectively, does not introduce any bias since interferences were shown to be negligible at these mass numbers. Internal analytical repeatability of 40Ca2+/24Mg2+ or 40Ca2+ / 28Si2+ over 10 cycles is typically in the range 1.5-6% (as 1 Sigma k%, k = 10) for 500-20 ppm wt Ca, respectively. Reproducibility of 40Ca2+/24Mg2+ and 40Ca2+ / 28Si2+ ratios in the standards over three analytical sessions is better than 8% rel. (Mg reference) and 6% rel. (Si reference) (as 1 Sigma m%), respectively, where Sigma m represents the standard deviation of the mean. Moreover, Ca can be monitored at the same spot with other trace elements of interest in olivine, such as H, Li, B, HREE, generally studied as high-energy ions. An estimation of matrix effects (< 9% rel.) on Ca2+/Si2+ ionization in silicates not containing Fe has been derived by studying an anorthoclase standard whose chemical composition is significantly different from that of olivine (no Mg and Fe, 20.12 wt% Al2O3 and 66.44 wt% SiO2). With this procedure it is possible to get accurate, rapid and straightforward quantitative data for Ca in low-Ca silicates. Important applications are in geothermobarometry of silicate systems involving olivine coexisting with clinopyroxene phase. (literal)
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