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Chromite as a key player on highly siderophile elements and osmium isotope compositions of the refractory mantle.

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Title: Chromite as a key player on highly siderophile elements and osmium isotope compositions of the refractory mantle.
Authors: Su, Ben-Xun1,2 (AUTHOR) subenxun@mail.igcas.ac.cn, Uysal, Ibrahim1,3 (AUTHOR), Akmaz, Recep Melih4 (AUTHOR), Pan, Qi-Qi1 (AUTHOR), Demir, Yılmaz5 (AUTHOR), Ackerman, Lukáš6,7 (AUTHOR), Robinson, Paul T.1 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Jun2026, Vol. 422, p68-79. 12p.
Subjects: Chromite, Siderophile elements, Lithosphere, Platinum group, Osmium isotopes, Earth's mantle, Ophiolites
Abstract: Chromitites in ophiolites are recognized for their high concentrations of highly siderophile elements (HSE), notably IPGE (Os, Ir and Ru). However, the effects of this enrichment on ophiolitic rocks and mantle heterogeneity remain poorly understood and to address this issue, we investigated chromitites from the Pozantı-Karsantı and Kızıldağ ophiolites in Türkiye. The results reveal HSE enrichment, particularly IPGE, in chromite separates compared to matrix, with indistinguishable Os isotope compositions between the two phases. This observation aligns with the presence of platinum-group minerals (PGM) occurring as inclusions within chromite grains. The IPGE enrichment and similar Os isotope compositions are also present in chromitites relative to dunites, suggesting close affinity of HSE with chromite fractions relative to silicate melts during chromite crystallization and aggregation. A global compilation of data on chromitites in ophiolites demonstrates covariations of HSE and their ratios with chromite Cr# values, indicating that chromite composition modulates its capacity to retain HSE. Peridotites containing chromite with low-Cr# (<45) exhibit consistent HSE concentrations and a decrease in 187Os/188Os t ratios as chromite Cr# values increase, reflecting different partial melting degrees. In contrast, the refractory peridotites (with chromite Cr# > 45) show more scattered HSE variations and distinct trends with chromite Cr#, generally trending towards the chromitite field. This variability likely reflects the compositional effects of chromite on HSE variations, suggesting significant metasomatism and interaction with parental melts of chromitites or evolved melts. Therefore, chromite plays a critical role in the variations of HSE contents and 187Os/188Os within the refractory mantle. [ABSTRACT FROM AUTHOR]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science 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: 194522211
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  Data: Chromite as a key player on highly siderophile elements and osmium isotope compositions of the refractory mantle.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Su%2C+Ben-Xun%22&quot;&gt;Su, Ben-Xun&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; subenxun@mail.igcas.ac.cn&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Uysal%2C+Ibrahim%22&quot;&gt;Uysal, Ibrahim&lt;/searchLink&gt;&lt;relatesTo&gt;1,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Akmaz%2C+Recep+Melih%22&quot;&gt;Akmaz, Recep Melih&lt;/searchLink&gt;&lt;relatesTo&gt;4&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Pan%2C+Qi-Qi%22&quot;&gt;Pan, Qi-Qi&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Demir%2C+Yılmaz%22&quot;&gt;Demir, Yılmaz&lt;/searchLink&gt;&lt;relatesTo&gt;5&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Ackerman%2C+Luk&#225;š%22&quot;&gt;Ackerman, Luk&#225;š&lt;/searchLink&gt;&lt;relatesTo&gt;6,7&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Robinson%2C+Paul+T%2E%22&quot;&gt;Robinson, Paul T.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
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– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Chromitites in ophiolites are recognized for their high concentrations of highly siderophile elements (HSE), notably IPGE (Os, Ir and Ru). However, the effects of this enrichment on ophiolitic rocks and mantle heterogeneity remain poorly understood and to address this issue, we investigated chromitites from the Pozantı-Karsantı and Kızıldağ ophiolites in T&#252;rkiye. The results reveal HSE enrichment, particularly IPGE, in chromite separates compared to matrix, with indistinguishable Os isotope compositions between the two phases. This observation aligns with the presence of platinum-group minerals (PGM) occurring as inclusions within chromite grains. The IPGE enrichment and similar Os isotope compositions are also present in chromitites relative to dunites, suggesting close affinity of HSE with chromite fractions relative to silicate melts during chromite crystallization and aggregation. A global compilation of data on chromitites in ophiolites demonstrates covariations of HSE and their ratios with chromite Cr# values, indicating that chromite composition modulates its capacity to retain HSE. Peridotites containing chromite with low-Cr# (&lt;45) exhibit consistent HSE concentrations and a decrease in 187Os/188Os t ratios as chromite Cr# values increase, reflecting different partial melting degrees. In contrast, the refractory peridotites (with chromite Cr# &gt; 45) show more scattered HSE variations and distinct trends with chromite Cr#, generally trending towards the chromitite field. This variability likely reflects the compositional effects of chromite on HSE variations, suggesting significant metasomatism and interaction with parental melts of chromitites or evolved melts. Therefore, chromite plays a critical role in the variations of HSE contents and 187Os/188Os within the refractory mantle. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.gca.2025.04.026
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 68
    Subjects:
      – SubjectFull: Chromite
        Type: general
      – SubjectFull: Siderophile elements
        Type: general
      – SubjectFull: Lithosphere
        Type: general
      – SubjectFull: Platinum group
        Type: general
      – SubjectFull: Osmium isotopes
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Ophiolites
        Type: general
    Titles:
      – TitleFull: Chromite as a key player on highly siderophile elements and osmium isotope compositions of the refractory mantle.
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            NameFull: Su, Ben-Xun
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            NameFull: Uysal, Ibrahim
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            NameFull: Akmaz, Recep Melih
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            NameFull: Pan, Qi-Qi
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            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
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              Value: 422
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