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Impact of metasomatism on halogen distribution in the North American sub-continental lithospheric mantle.

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Title: Impact of metasomatism on halogen distribution in the North American sub-continental lithospheric mantle.
Authors: Segee-Wright, George1,2 (AUTHOR) george.segee-wright@univ-lorraine.fr, Lassiter, John C.2 (AUTHOR), Barnes, Jaime D.2 (AUTHOR), Le Roux, Véronique1,3 (AUTHOR), Monteleone, Brian D.3 (AUTHOR), Riley, Matthew K.2,4 (AUTHOR)
Source: Geochimica et Cosmochimica Acta. Jul2026, Vol. 425, p200-212. 13p.
Subjects: Metasomatism, Chlorine, Earth's mantle, Fluorine, Fluorination, Subduction, Lithosphere
Geographic Terms: Colorado Plateau, United States
Abstract: Fluorine (F) and chlorine (Cl) in the mantle are useful tracers of subduction processes. Recent work has suggested that F and Cl can be sequestered in the Sub-Continental Lithospheric Mantle (SCLM) through interactions with subduction- or mantle-derived fluids and melts. Yet, the distribution of metasomatic halogens in the SCLM is unclear. In this study, we examine the effects of metasomatism and melt depletion on the halogen abundances in nominally anhydrous minerals (NAMs; olivine, orthopyroxene, and clinopyroxene), as well as in hydrous minerals (antigorite, chlorite, amphibole) in variably metasomatized SCLM peridotite xenoliths from the Colorado Plateau (USA) and the southern Rio Grande Rift (USA). We find that F and Cl are dominantly hosted in hydrous minerals in modally hydrated xenoliths, but H 2 O and Cl are variably enriched in NAMs resulting from recent metasomatism via a Cl-rich fluid. Fluorine shows no such enrichment in NAMs, likely due to the F-poor nature of the fluid in this region. In modally anhydrous xenoliths, Cl hosted in NAMs show no correlations with indices of metasomatism. Instead, the majority of Cl and variable amounts of other incompatible trace elements are likely hosted along grain boundaries, resulting from metasomatic enrichment of the SCLM. Grain boundaries may be an important host of metasomatic Cl in the modally anhydrous SCLM, potentially altering the calculated quantity of Cl in global SCLM and impacting the extent of Cl released during intraplate magmatism. [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
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Impact of metasomatism on halogen distribution in the North American sub-continental lithospheric mantle.
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  Data: <searchLink fieldCode="AR" term="%22Segee-Wright%2C+George%22">Segee-Wright, George</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> george.segee-wright@univ-lorraine.fr</i><br /><searchLink fieldCode="AR" term="%22Lassiter%2C+John+C%2E%22">Lassiter, John C.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Barnes%2C+Jaime+D%2E%22">Barnes, Jaime D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Le+Roux%2C+Véronique%22">Le Roux, Véronique</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Monteleone%2C+Brian+D%2E%22">Monteleone, Brian D.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Riley%2C+Matthew+K%2E%22">Riley, Matthew K.</searchLink><relatesTo>2,4</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Jul2026, Vol. 425, p200-212. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Metasomatism%22">Metasomatism</searchLink><br /><searchLink fieldCode="DE" term="%22Chlorine%22">Chlorine</searchLink><br /><searchLink fieldCode="DE" term="%22Earth's+mantle%22">Earth's mantle</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorine%22">Fluorine</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorination%22">Fluorination</searchLink><br /><searchLink fieldCode="DE" term="%22Subduction%22">Subduction</searchLink><br /><searchLink fieldCode="DE" term="%22Lithosphere%22">Lithosphere</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Colorado+Plateau%22">Colorado Plateau</searchLink><br /><searchLink fieldCode="DE" term="%22United+States%22">United States</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Fluorine (F) and chlorine (Cl) in the mantle are useful tracers of subduction processes. Recent work has suggested that F and Cl can be sequestered in the Sub-Continental Lithospheric Mantle (SCLM) through interactions with subduction- or mantle-derived fluids and melts. Yet, the distribution of metasomatic halogens in the SCLM is unclear. In this study, we examine the effects of metasomatism and melt depletion on the halogen abundances in nominally anhydrous minerals (NAMs; olivine, orthopyroxene, and clinopyroxene), as well as in hydrous minerals (antigorite, chlorite, amphibole) in variably metasomatized SCLM peridotite xenoliths from the Colorado Plateau (USA) and the southern Rio Grande Rift (USA). We find that F and Cl are dominantly hosted in hydrous minerals in modally hydrated xenoliths, but H 2 O and Cl are variably enriched in NAMs resulting from recent metasomatism via a Cl-rich fluid. Fluorine shows no such enrichment in NAMs, likely due to the F-poor nature of the fluid in this region. In modally anhydrous xenoliths, Cl hosted in NAMs show no correlations with indices of metasomatism. Instead, the majority of Cl and variable amounts of other incompatible trace elements are likely hosted along grain boundaries, resulting from metasomatic enrichment of the SCLM. Grain boundaries may be an important host of metasomatic Cl in the modally anhydrous SCLM, potentially altering the calculated quantity of Cl in global SCLM and impacting the extent of Cl released during intraplate magmatism. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>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.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.gca.2026.04.042
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 13
        StartPage: 200
    Subjects:
      – SubjectFull: Metasomatism
        Type: general
      – SubjectFull: Chlorine
        Type: general
      – SubjectFull: Earth's mantle
        Type: general
      – SubjectFull: Fluorine
        Type: general
      – SubjectFull: Fluorination
        Type: general
      – SubjectFull: Subduction
        Type: general
      – SubjectFull: Lithosphere
        Type: general
      – SubjectFull: Colorado Plateau
        Type: general
      – SubjectFull: United States
        Type: general
    Titles:
      – TitleFull: Impact of metasomatism on halogen distribution in the North American sub-continental lithospheric mantle.
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            – D: 15
              M: 07
              Text: Jul2026
              Type: published
              Y: 2026
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              Value: 425
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