Selenium isotope evidence for pulsed flow of oxidative slab fluids

Isotope systematics of the redox sensitive and chalcophile element selenium (Se) were investigated on exhumed parts of subducted oceanic lithosphere to provide new constraints on slab dehydration conditions during subduction. The samples show increasing δ82/76SeNIST3149 with higher abundances of flu...

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Autores: König, Stephan, Rosca, Carolina, Kurzawa. T., Varas-Reus, M.I., Dragovic, B., Schoenberg, R., John, T.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2021
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/413854
Acceso en línea:http://hdl.handle.net/10261/413854
https://doi.org/10.7185/geochemlet.2110
Access Level:acceso abierto
Palabra clave:Selenium isotopes
Sulfur
Sulfides
Recycling
Subduction
Redox
Slab fluids
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spelling Selenium isotope evidence for pulsed flow of oxidative slab fluidsKönig, StephanRosca, CarolinaKurzawa. T.Varas-Reus, M.I.Dragovic, B.Schoenberg, R.John, T.Selenium isotopesSulfurSulfidesRecyclingSubductionRedoxSlab fluidsIsotope systematics of the redox sensitive and chalcophile element selenium (Se) were investigated on exhumed parts of subducted oceanic lithosphere to provide new constraints on slab dehydration conditions during subduction. The samples show increasing δ82/76SeNIST3149 with higher abundances of fluid mobile elements, comprising a larger range (−1.89 to þ0.48 %) than that of mantle (−0.13 ± 0.12 %) and altered ocean crust (−0.35 to −0.07 %). Our data point to pronounced, local scale redox variations within the subducting crust, wherein oxidative fluids dissolve sulfides and mobilise oxidised Se species. Subsequently recrystallising sulfides preferentially incorporate isotopically lighter, reduced Se, which shifts evolving fluids and late stage sulfides to higher δ82/76SeNIST3149. Redistribution of Se by repeated cycles of sulfide reworking within the subducted crust can be reconciled with episodes of oxidised fluid pulses from underlying slab mantle in modern subduction zones.SK acknowledges ERC Starting Grant O2RIGIN (636808).Peer reviewedEuropean Association of GeochemistryEuropean Research CouncilEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/413854https://doi.org/10.7185/geochemlet.2110reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/636808https://doi.org/10.7185/geochemlet.2110Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4138542026-05-22T06:33:51Z
dc.title.none.fl_str_mv Selenium isotope evidence for pulsed flow of oxidative slab fluids
title Selenium isotope evidence for pulsed flow of oxidative slab fluids
spellingShingle Selenium isotope evidence for pulsed flow of oxidative slab fluids
König, Stephan
Selenium isotopes
Sulfur
Sulfides
Recycling
Subduction
Redox
Slab fluids
title_short Selenium isotope evidence for pulsed flow of oxidative slab fluids
title_full Selenium isotope evidence for pulsed flow of oxidative slab fluids
title_fullStr Selenium isotope evidence for pulsed flow of oxidative slab fluids
title_full_unstemmed Selenium isotope evidence for pulsed flow of oxidative slab fluids
title_sort Selenium isotope evidence for pulsed flow of oxidative slab fluids
dc.creator.none.fl_str_mv König, Stephan
Rosca, Carolina
Kurzawa. T.
Varas-Reus, M.I.
Dragovic, B.
Schoenberg, R.
John, T.
author König, Stephan
author_facet König, Stephan
Rosca, Carolina
Kurzawa. T.
Varas-Reus, M.I.
Dragovic, B.
Schoenberg, R.
John, T.
author_role author
author2 Rosca, Carolina
Kurzawa. T.
Varas-Reus, M.I.
Dragovic, B.
Schoenberg, R.
John, T.
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv European Research Council
European Commission
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Selenium isotopes
Sulfur
Sulfides
Recycling
Subduction
Redox
Slab fluids
topic Selenium isotopes
Sulfur
Sulfides
Recycling
Subduction
Redox
Slab fluids
description Isotope systematics of the redox sensitive and chalcophile element selenium (Se) were investigated on exhumed parts of subducted oceanic lithosphere to provide new constraints on slab dehydration conditions during subduction. The samples show increasing δ82/76SeNIST3149 with higher abundances of fluid mobile elements, comprising a larger range (−1.89 to þ0.48 %) than that of mantle (−0.13 ± 0.12 %) and altered ocean crust (−0.35 to −0.07 %). Our data point to pronounced, local scale redox variations within the subducting crust, wherein oxidative fluids dissolve sulfides and mobilise oxidised Se species. Subsequently recrystallising sulfides preferentially incorporate isotopically lighter, reduced Se, which shifts evolving fluids and late stage sulfides to higher δ82/76SeNIST3149. Redistribution of Se by repeated cycles of sulfide reworking within the subducted crust can be reconciled with episodes of oxidised fluid pulses from underlying slab mantle in modern subduction zones.
publishDate 2021
dc.date.none.fl_str_mv 2021
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/413854
https://doi.org/10.7185/geochemlet.2110
url http://hdl.handle.net/10261/413854
https://doi.org/10.7185/geochemlet.2110
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/H2020/636808
https://doi.org/10.7185/geochemlet.2110
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv European Association of Geochemistry
publisher.none.fl_str_mv European Association of Geochemistry
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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