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Tracing the origin of mantle heterogeneities with the Fe isotopic composition of Southwest Indian Ridge Basalts.

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Title: Tracing the origin of mantle heterogeneities with the Fe isotopic composition of Southwest Indian Ridge Basalts.
Authors: Motte, Mikaël1 (AUTHOR) mikael.motte@univ-nantes.fr, Bézos, Antoine1 (AUTHOR), Paquet, Marine1 (AUTHOR), Rivoal, Marion1 (AUTHOR), Moynier, Frederic1 (AUTHOR)
Source: Earth & Planetary Science Letters. May2026, Vol. 682, pN.PAG-N.PAG. 1p.
Subjects: Iron isotopes, Pyroxenite, Earth's mantle, Mid-ocean ridges, Rare earth metals, Basalt
Abstract: • Fe isotopes and REE have been analyzed on glassy samples from the Southwest Indian Ridge between 49° and 69°E longitude. • The positive correlations between Fe isotopes, sodium and light REE enrichment suggest mixing between partial melts derived from a peridotitic and a pyroxenitic lithology. • The linear negative correlation between Fe and Pb isotopes rules out an origin of the pyroxenitic component from low-F melt metasomatism or LCC-derived materials. Instead, it likely reflects recycling of sulfide-and garnet-bearing pyroxenite The peculiar Sr–Nd–Pb–Hf isotopic compositions of Southwest Indian Ridge (SWIR) basalts, referred to as the DUPAL anomaly, have been attributed to the recycling of Lower Continental Crust (LCC) mafic lithologies. Iron stable isotope represents a promising proxy for providing further insight into the lithological nature of the DUPAL anomaly. We report Fe isotope and Rare Earth Element (REE) data for 27 basaltic glasses along the SWIR axis between 49° and 69°E longitude. The δ 56Fe values (deviation in 56Fe/54Fe from the IRMM-014 standard, expressed in parts per thousand) of SWIR basalts range from +0.06‰ to +0.16‰, falling within the typical range of Mid-Oceanic Ridge basalts (MORB). Variations in δ 56Fe can only be partially explained by fractional crystallization. In particular, the easternmost SWIR basalts (Zone A) display the full range of δ 56Fe variation at nearly constant MgO. When corrected for the effects of fractional crystallization, Zone A basalts exhibit positive correlations among δ 56Fe, Na 2 O, and Light REE enrichment. These trends can be accounted for by mixing of melts derived from depleted peridotite and enriched pyroxenite sources. Furthermore, the linear and negative Fe–Pb isotopic array defined by Zone A basalts provides key constraints on the origin of the heavy δ 56Fe pyroxenitic component. In particular, the involvement of an ancient low degree (Low-F) melt metasomatic source or recycled DUPAL-like LCC can be excluded. We infer that the heavy δ 56Fe and unradiogenic Pb signatures of SWIR basalts are consistent with a contribution from ancient, recycled, sulfide-bearing pyroxenites. [ABSTRACT FROM AUTHOR]
Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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: Tracing the origin of mantle heterogeneities with the Fe isotopic composition of Southwest Indian Ridge Basalts.
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  Data: <searchLink fieldCode="AR" term="%22Motte%2C+Mikaël%22">Motte, Mikaël</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> mikael.motte@univ-nantes.fr</i><br /><searchLink fieldCode="AR" term="%22Bézos%2C+Antoine%22">Bézos, Antoine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Paquet%2C+Marine%22">Paquet, Marine</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rivoal%2C+Marion%22">Rivoal, Marion</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Moynier%2C+Frederic%22">Moynier, Frederic</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Earth+%26+Planetary+Science+Letters%22">Earth & Planetary Science Letters</searchLink>. May2026, Vol. 682, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Iron+isotopes%22">Iron isotopes</searchLink><br /><searchLink fieldCode="DE" term="%22Pyroxenite%22">Pyroxenite</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Mid-ocean+ridges%22">Mid-ocean ridges</searchLink><br /><searchLink fieldCode="DE" term="%22Rare+earth+metals%22">Rare earth metals</searchLink><br /><searchLink fieldCode="DE" term="%22Basalt%22">Basalt</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Fe isotopes and REE have been analyzed on glassy samples from the Southwest Indian Ridge between 49° and 69°E longitude. • The positive correlations between Fe isotopes, sodium and light REE enrichment suggest mixing between partial melts derived from a peridotitic and a pyroxenitic lithology. • The linear negative correlation between Fe and Pb isotopes rules out an origin of the pyroxenitic component from low-F melt metasomatism or LCC-derived materials. Instead, it likely reflects recycling of sulfide-and garnet-bearing pyroxenite The peculiar Sr–Nd–Pb–Hf isotopic compositions of Southwest Indian Ridge (SWIR) basalts, referred to as the DUPAL anomaly, have been attributed to the recycling of Lower Continental Crust (LCC) mafic lithologies. Iron stable isotope represents a promising proxy for providing further insight into the lithological nature of the DUPAL anomaly. We report Fe isotope and Rare Earth Element (REE) data for 27 basaltic glasses along the SWIR axis between 49° and 69°E longitude. The δ 56Fe values (deviation in 56Fe/54Fe from the IRMM-014 standard, expressed in parts per thousand) of SWIR basalts range from +0.06‰ to +0.16‰, falling within the typical range of Mid-Oceanic Ridge basalts (MORB). Variations in δ 56Fe can only be partially explained by fractional crystallization. In particular, the easternmost SWIR basalts (Zone A) display the full range of δ 56Fe variation at nearly constant MgO. When corrected for the effects of fractional crystallization, Zone A basalts exhibit positive correlations among δ 56Fe, Na 2 O, and Light REE enrichment. These trends can be accounted for by mixing of melts derived from depleted peridotite and enriched pyroxenite sources. Furthermore, the linear and negative Fe–Pb isotopic array defined by Zone A basalts provides key constraints on the origin of the heavy δ 56Fe pyroxenitic component. In particular, the involvement of an ancient low degree (Low-F) melt metasomatic source or recycled DUPAL-like LCC can be excluded. We infer that the heavy δ 56Fe and unradiogenic Pb signatures of SWIR basalts are consistent with a contribution from ancient, recycled, sulfide-bearing pyroxenites. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Earth & Planetary Science Letters is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.epsl.2026.119954
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Iron isotopes
        Type: general
      – SubjectFull: Pyroxenite
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Mid-ocean ridges
        Type: general
      – SubjectFull: Rare earth metals
        Type: general
      – SubjectFull: Basalt
        Type: general
    Titles:
      – TitleFull: Tracing the origin of mantle heterogeneities with the Fe isotopic composition of Southwest Indian Ridge Basalts.
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            NameFull: Motte, Mikaël
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            NameFull: Bézos, Antoine
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            NameFull: Paquet, Marine
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            – D: 15
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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              Value: 682
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