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GX-5 calcite: a new matrix-matched reference material for in-situ LA-ICP-MS carbonate U–Pb geochronology.

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Title: GX-5 calcite: a new matrix-matched reference material for in-situ LA-ICP-MS carbonate U–Pb geochronology.
Authors: Gui, Lili1,2 (AUTHOR), Lu, Xuesong1,2 (AUTHOR) luxs@petrochina.com.cn, Zhang, Liangliang3 (AUTHOR) changialight@163.com, Jiang, Lin1,2 (AUTHOR), Chen, Weiyan1,2 (AUTHOR), Zhao, Jianxin4,5 (AUTHOR), Feng, Yuexing4,5 (AUTHOR), Liu, Shaobo1,2 (AUTHOR), Yang, Xiao6 (AUTHOR), Jiang, Hua1,2 (AUTHOR), Yan, Yusheng7 (AUTHOR), Wang, Xiaomei1,2 (AUTHOR)
Source: JAAS (Journal of Analytical Atomic Spectrometry). May2026, Vol. 41 Issue 5, p1856-1868. 13p.
Subjects: Uranium-lead dating, Reference sources, Isotopic analysis, Geological time scales, Carbonate minerals, Uranium, Laser ablation inductively coupled plasma mass spectrometry
Abstract: In situ laser ablation U–Pb dating of carbonate minerals has emerged as an important geochronological tool, providing direct temporal constraints for hydrocarbon accumulation, mineral exploration, and tectonic processes. However, the limited availability of matrix-matched reference materials significantly restricts analytical accuracy, precision, and broader interlaboratory application. In this study, we present GX-5, a calcite reference material collected from a massive calcite vein. GX-5 is characterized as homogeneous low-Mg calcite with high uranium content (mean = 6.09 µg g−1) and low common lead composition (mean f206 = 4.75%), making it suitable for in situ LA-ICP-MS U–Pb geochronology. A total of 79 analytical sessions yield a lower intercept age of 78.64 ± 0.1 Ma (2S, MSWD = 5.8, n = 168, 8810 tests). Independent isotope dilution multi-collector inductively coupled plasma mass spectrometry (ID-MC-ICP-MS) analyses define a U–Pb age of 78.88 ± 0.15 Ma (2S, MSWD = 1.07, n = 8), with an initial 207Pb/206Pb value of 0.896 ± 0.039. The agreement between in situ and solution-based results demonstrates the isotopic homogeneity and age stability of GX-5. Owing to its abundant material supply, elevated uranium content, and consistent long-term analytical performance, GX-5 is proposed as a reliable matrix-matched reference material for in situ carbonate U–Pb dating. [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: 193714416
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: GX-5 calcite: a new matrix-matched reference material for in-situ LA-ICP-MS carbonate U–Pb geochronology.
– Name: Author
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  Data: <searchLink fieldCode="AR" term="%22Gui%2C+Lili%22">Gui, Lili</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lu%2C+Xuesong%22">Lu, Xuesong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> luxs@petrochina.com.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Liangliang%22">Zhang, Liangliang</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> changialight@163.com</i><br /><searchLink fieldCode="AR" term="%22Jiang%2C+Lin%22">Jiang, Lin</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Weiyan%22">Chen, Weiyan</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Jianxin%22">Zhao, Jianxin</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Feng%2C+Yuexing%22">Feng, Yuexing</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Shaobo%22">Liu, Shaobo</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yang%2C+Xiao%22">Yang, Xiao</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jiang%2C+Hua%22">Jiang, Hua</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yan%2C+Yusheng%22">Yan, Yusheng</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Xiaomei%22">Wang, Xiaomei</searchLink><relatesTo>1,2</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>. May2026, Vol. 41 Issue 5, p1856-1868. 13p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Uranium-lead+dating%22">Uranium-lead dating</searchLink><br /><searchLink fieldCode="DE" term="%22Reference+sources%22">Reference sources</searchLink><br /><searchLink fieldCode="DE" term="%22Isotopic+analysis%22">Isotopic analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Geological+time+scales%22">Geological time scales</searchLink><br /><searchLink fieldCode="DE" term="%22Carbonate+minerals%22">Carbonate minerals</searchLink><br /><searchLink fieldCode="DE" term="%22Uranium%22">Uranium</searchLink><br /><searchLink fieldCode="DE" term="%22Laser+ablation+inductively+coupled+plasma+mass+spectrometry%22">Laser ablation inductively coupled plasma mass spectrometry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: In situ laser ablation U–Pb dating of carbonate minerals has emerged as an important geochronological tool, providing direct temporal constraints for hydrocarbon accumulation, mineral exploration, and tectonic processes. However, the limited availability of matrix-matched reference materials significantly restricts analytical accuracy, precision, and broader interlaboratory application. In this study, we present GX-5, a calcite reference material collected from a massive calcite vein. GX-5 is characterized as homogeneous low-Mg calcite with high uranium content (mean = 6.09 µg g−1) and low common lead composition (mean f206 = 4.75%), making it suitable for in situ LA-ICP-MS U–Pb geochronology. A total of 79 analytical sessions yield a lower intercept age of 78.64 ± 0.1 Ma (2S, MSWD = 5.8, n = 168, 8810 tests). Independent isotope dilution multi-collector inductively coupled plasma mass spectrometry (ID-MC-ICP-MS) analyses define a U–Pb age of 78.88 ± 0.15 Ma (2S, MSWD = 1.07, n = 8), with an initial 207Pb/206Pb value of 0.896 ± 0.039. The agreement between in situ and solution-based results demonstrates the isotopic homogeneity and age stability of GX-5. Owing to its abundant material supply, elevated uranium content, and consistent long-term analytical performance, GX-5 is proposed as a reliable matrix-matched reference material for in situ carbonate U–Pb dating. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  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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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1039/d6ja00056h
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 1856
    Subjects:
      – SubjectFull: Uranium-lead dating
        Type: general
      – SubjectFull: Reference sources
        Type: general
      – SubjectFull: Isotopic analysis
        Type: general
      – SubjectFull: Geological time scales
        Type: general
      – SubjectFull: Carbonate minerals
        Type: general
      – SubjectFull: Uranium
        Type: general
      – SubjectFull: Laser ablation inductively coupled plasma mass spectrometry
        Type: general
    Titles:
      – TitleFull: GX-5 calcite: a new matrix-matched reference material for in-situ LA-ICP-MS carbonate U–Pb geochronology.
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            NameFull: Gui, Lili
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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