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Cat–87 clinopyroxene: a new reference material for oxygen isotope microanalysis, with applicability tested across a range of Ca–Mg–Fe clinopyroxene compositions.

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Title: Cat–87 clinopyroxene: a new reference material for oxygen isotope microanalysis, with applicability tested across a range of Ca–Mg–Fe clinopyroxene compositions.
Authors: Melnik, Aleksei1 (AUTHOR) melnik@ustb.edu.cn, Korolev, Nester2 (AUTHOR), Li, Qiu-Li3 (AUTHOR) liqiuli@mail.iggcas.ac.cn, Li, Jiao3 (AUTHOR), Tang, Guo-Qiang3 (AUTHOR), Feng, Lian-Jun3 (AUTHOR), Müller, Dirk4 (AUTHOR), Zinchenko, Vladimir N.5 (AUTHOR), Li, Xian-Hua3 (AUTHOR)
Source: JAAS (Journal of Analytical Atomic Spectrometry). Feb2026, Vol. 41 Issue 2, p791-800. 10p.
Subjects: Oxygen isotopes, Pyroxene, Secondary ion mass spectrometry, Quality control standards, Mineralogy, Geochemistry
Abstract: Clinopyroxene oxygen isotope compositions provide critical insights into diverse geological processes. In situ oxygen isotope analysis is preferred over bulk methods because of complications such as inclusions, alteration, and isotope heterogeneity, all of which are common in natural clinopyroxene samples. Secondary ion mass spectrometry (SIMS) enables precise in situ oxygen isotope analysis at a spatial resolution of 10–15 µm. However, accurate SIMS results require homogeneous reference materials (RMs) that match the chemistry and crystal structure of the target minerals. Despite the wide compositional variability of natural clinopyroxenes, the number of available oxygen isotope RMs is limited. In this study, we characterize Cat–87 clinopyroxene as a new RM for oxygen isotope microanalysis. The major element composition of Cat–87 (Wo36.0En55.2Fs8.8; Wo = wollastonite, En = enstatite, Fs = ferrosilite) expands the compositional coverage of available clinopyroxene RMs, and multiple SIMS measurements demonstrate its oxygen isotope homogeneity. A laser fluorination δ18O value of 5.53 ± 0.14‰ (2SD) is recommended as the reference value for Cat–87. Evaluation using eight Ca–Mg–Fe clinopyroxenes with variable chemistry demonstrates that Cat–87 is suitable for SIMS clinopyroxene oxygen isotope analysis in the compositional range Wo33.8–37.6En51.6–58.0Fs8.2–11.0. In contrast, Cat–87 is not suitable for clinopyroxenes with higher Ca contents (Wo44.6–47.5En48.3–50.2Fs3.7–7.2). [ABSTRACT FROM AUTHOR]
Copyright of JAAS (Journal of Analytical Atomic Spectrometry) is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 191482431
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  Label: Title
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  Data: Cat–87 clinopyroxene: a new reference material for oxygen isotope microanalysis, with applicability tested across a range of Ca–Mg–Fe clinopyroxene compositions.
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  Data: <searchLink fieldCode="AR" term="%22Melnik%2C+Aleksei%22">Melnik, Aleksei</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> melnik@ustb.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Korolev%2C+Nester%22">Korolev, Nester</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Qiu-Li%22">Li, Qiu-Li</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> liqiuli@mail.iggcas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Jiao%22">Li, Jiao</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Guo-Qiang%22">Tang, Guo-Qiang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Lian-Jun%22">Feng, Lian-Jun</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Müller%2C+Dirk%22">Müller, Dirk</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zinchenko%2C+Vladimir+N%2E%22">Zinchenko, Vladimir N.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Xian-Hua%22">Li, Xian-Hua</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22JAAS+%28Journal+of+Analytical+Atomic+Spectrometry%29%22">JAAS (Journal of Analytical Atomic Spectrometry)</searchLink>. Feb2026, Vol. 41 Issue 2, p791-800. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Oxygen+isotopes%22">Oxygen isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Pyroxene%22">Pyroxene</searchLink><br /><searchLink fieldCode="DE" term="%22Secondary+ion+mass+spectrometry%22">Secondary ion mass spectrometry</searchLink><br /><searchLink fieldCode="DE" term="%22Quality+control+standards%22">Quality control standards</searchLink><br /><searchLink fieldCode="DE" term="%22Mineralogy%22">Mineralogy</searchLink><br /><searchLink fieldCode="DE" term="%22Geochemistry%22">Geochemistry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Clinopyroxene oxygen isotope compositions provide critical insights into diverse geological processes. In situ oxygen isotope analysis is preferred over bulk methods because of complications such as inclusions, alteration, and isotope heterogeneity, all of which are common in natural clinopyroxene samples. Secondary ion mass spectrometry (SIMS) enables precise in situ oxygen isotope analysis at a spatial resolution of 10–15 µm. However, accurate SIMS results require homogeneous reference materials (RMs) that match the chemistry and crystal structure of the target minerals. Despite the wide compositional variability of natural clinopyroxenes, the number of available oxygen isotope RMs is limited. In this study, we characterize Cat–87 clinopyroxene as a new RM for oxygen isotope microanalysis. The major element composition of Cat–87 (Wo36.0En55.2Fs8.8; Wo = wollastonite, En = enstatite, Fs = ferrosilite) expands the compositional coverage of available clinopyroxene RMs, and multiple SIMS measurements demonstrate its oxygen isotope homogeneity. A laser fluorination δ18O value of 5.53 ± 0.14‰ (2SD) is recommended as the reference value for Cat–87. Evaluation using eight Ca–Mg–Fe clinopyroxenes with variable chemistry demonstrates that Cat–87 is suitable for SIMS clinopyroxene oxygen isotope analysis in the compositional range Wo33.8–37.6En51.6–58.0Fs8.2–11.0. In contrast, Cat–87 is not suitable for clinopyroxenes with higher Ca contents (Wo44.6–47.5En48.3–50.2Fs3.7–7.2). [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of JAAS (Journal of Analytical Atomic Spectrometry) is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1039/d5ja00412h
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 791
    Subjects:
      – SubjectFull: Oxygen isotopes
        Type: general
      – SubjectFull: Pyroxene
        Type: general
      – SubjectFull: Secondary ion mass spectrometry
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      – SubjectFull: Quality control standards
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      – SubjectFull: Mineralogy
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      – SubjectFull: Geochemistry
        Type: general
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      – TitleFull: Cat–87 clinopyroxene: a new reference material for oxygen isotope microanalysis, with applicability tested across a range of Ca–Mg–Fe clinopyroxene compositions.
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              M: 02
              Text: Feb2026
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              Y: 2026
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