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Parent body processing and constraints on an IAB iron connection from Re-Os isotopes and highly siderophile element abundances in winonaites.

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Title: Parent body processing and constraints on an IAB iron connection from Re-Os isotopes and highly siderophile element abundances in winonaites.
Authors: Zhang, Xinmu J.1,2 (AUTHOR) judyzhang@wustl.edu, Day, James M.D.1 (AUTHOR), Nicklas, Robert W.1,3 (AUTHOR), Srivastava, Yash1 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Dec2025, Vol. 411, p19-38. 20p.
Subjects: Siderophile elements, Achondrites, Analytical geochemistry, Iron meteorites, Chondrites, Osmium isotopes
Abstract: Winonaites are a group of primitive achondrites with broadly chondritic bulk compositions and relict chondritic textures that reflect variable and limited extents of partial melting due to incomplete parent-body metal-silicate segregation. Winonaites therefore provide a snapshot of the role of incipient heating and melting in chondritic parent bodies. Among different winonaite samples, a high degree of inherent textural and chemical heterogeneities on small scales (<1 cm) is observed, likely resulting from variations in heating, metamorphism, impact brecciation, and reassembly. To investigate parent-body heterogeneities and early metal-silicate differentiation, we present whole-rock highly siderophile element (HSE; including Re, Os, Ir, Ru, Pt, Pd) abundances and 187Re-187Os data for seven winonaites. We also report HSE abundances (Re, Os, Ir, Ru, Rh, Pt, Pd, Au) for winonaite metal and sulfides measured in situ. Bulk-rock winonaites all have broadly chondritic measured 187Os/188Os (0.1267 ± 0.0010, 2SE). Among the bulk winonaites analyzed, Winona and Tierra Blanca show the greatest degrees of inter-element HSE fractionation. By contrast, Graves Nunataks 12510, Yamato-8005, and Pontlyfni have near-chondritic bulk major- and trace-elements abundances, and relative HSE abundance patterns. Unlike other primitive achondrite groups, supra-chondritic Pd/Pt and Pd/Os ratios are characteristic of winonaite metals, possibly suggesting a nebular or parent-body process (e.g., fractional fusion) origin. The HSE abundances of winonaite metals suggest compositional similarities with the IAB sLL iron meteorite subgroup and argue against a genetic connection with main group IAB irons, demonstrating the need for future nucleosynthetic and chronological studies to reevaluate the previously proposed winonaite-IAB connection. [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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  Data: Parent body processing and constraints on an IAB iron connection from Re-Os isotopes and highly siderophile element abundances in winonaites.
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  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Zhang%2C+Xinmu+J%2E%22&quot;&gt;Zhang, Xinmu J.&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; judyzhang@wustl.edu&lt;/i&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Day%2C+James+M%2ED%2E%22&quot;&gt;Day, James M.D.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Nicklas%2C+Robert+W%2E%22&quot;&gt;Nicklas, Robert W.&lt;/searchLink&gt;&lt;relatesTo&gt;1,3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Srivastava%2C+Yash%22&quot;&gt;Srivastava, Yash&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)
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  Data: Winonaites are a group of primitive achondrites with broadly chondritic bulk compositions and relict chondritic textures that reflect variable and limited extents of partial melting due to incomplete parent-body metal-silicate segregation. Winonaites therefore provide a snapshot of the role of incipient heating and melting in chondritic parent bodies. Among different winonaite samples, a high degree of inherent textural and chemical heterogeneities on small scales (&lt;1 cm) is observed, likely resulting from variations in heating, metamorphism, impact brecciation, and reassembly. To investigate parent-body heterogeneities and early metal-silicate differentiation, we present whole-rock highly siderophile element (HSE; including Re, Os, Ir, Ru, Pt, Pd) abundances and 187Re-187Os data for seven winonaites. We also report HSE abundances (Re, Os, Ir, Ru, Rh, Pt, Pd, Au) for winonaite metal and sulfides measured in situ. Bulk-rock winonaites all have broadly chondritic measured 187Os/188Os (0.1267 &#177; 0.0010, 2SE). Among the bulk winonaites analyzed, Winona and Tierra Blanca show the greatest degrees of inter-element HSE fractionation. By contrast, Graves Nunataks 12510, Yamato-8005, and Pontlyfni have near-chondritic bulk major- and trace-elements abundances, and relative HSE abundance patterns. Unlike other primitive achondrite groups, supra-chondritic Pd/Pt and Pd/Os ratios are characteristic of winonaite metals, possibly suggesting a nebular or parent-body process (e.g., fractional fusion) origin. The HSE abundances of winonaite metals suggest compositional similarities with the IAB sLL iron meteorite subgroup and argue against a genetic connection with main group IAB irons, demonstrating the need for future nucleosynthetic and chronological studies to reevaluate the previously proposed winonaite-IAB connection. [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.2025.11.014
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 20
        StartPage: 19
    Subjects:
      – SubjectFull: Siderophile elements
        Type: general
      – SubjectFull: Achondrites
        Type: general
      – SubjectFull: Analytical geochemistry
        Type: general
      – SubjectFull: Iron meteorites
        Type: general
      – SubjectFull: Chondrites
        Type: general
      – SubjectFull: Osmium isotopes
        Type: general
    Titles:
      – TitleFull: Parent body processing and constraints on an IAB iron connection from Re-Os isotopes and highly siderophile element abundances in winonaites.
        Type: main
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            NameFull: Zhang, Xinmu J.
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            NameFull: Day, James M.D.
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            NameFull: Nicklas, Robert W.
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            NameFull: Srivastava, Yash
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            – D: 15
              M: 12
              Text: Dec2025
              Type: published
              Y: 2025
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              Value: 411
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