Isotopic constraints on the Barium subduction cycle

Subduction processes regulate elemental cycling and consequently the composition of Earth’s geochemical reservoirs - mantle, crust, atmosphere, and hydrosphere, exerting far-reaching effects for the evolution of life. Barium (Ba) is essential for understanding crust-mantle recycling, especially sinc...

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Autores: Ahmad, Qasid, Wille, Martin, Rosca, Carolina, Pettke, Thomas, Hermann, Jörg, König, Stephan
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/411706
Acceso en línea:http://hdl.handle.net/10261/411706
https://doi.org/10.1016/j.epsl.2025.119789
Access Level:acceso abierto
Palabra clave:Barium
Tonga
Arc lava
Subduction recycling
Sediments
Serpentinites
id ES_6a610a6b92fbcb9fba8624ecdfdba812
oai_identifier_str oai:digital.csic.es:10261/411706
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Isotopic constraints on the Barium subduction cycle
title Isotopic constraints on the Barium subduction cycle
spellingShingle Isotopic constraints on the Barium subduction cycle
Ahmad, Qasid
Barium
Tonga
Arc lava
Subduction recycling
Sediments
Serpentinites
title_short Isotopic constraints on the Barium subduction cycle
title_full Isotopic constraints on the Barium subduction cycle
title_fullStr Isotopic constraints on the Barium subduction cycle
title_full_unstemmed Isotopic constraints on the Barium subduction cycle
title_sort Isotopic constraints on the Barium subduction cycle
dc.creator.none.fl_str_mv Ahmad, Qasid
Wille, Martin
Rosca, Carolina
Pettke, Thomas
Hermann, Jörg
König, Stephan
author Ahmad, Qasid
author_facet Ahmad, Qasid
Wille, Martin
Rosca, Carolina
Pettke, Thomas
Hermann, Jörg
König, Stephan
author_role author
author2 Wille, Martin
Rosca, Carolina
Pettke, Thomas
Hermann, Jörg
König, Stephan
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Swiss National Science Foundation
Ministerio de Ciencia, Innovación y Universidades (España)
Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Barium
Tonga
Arc lava
Subduction recycling
Sediments
Serpentinites
topic Barium
Tonga
Arc lava
Subduction recycling
Sediments
Serpentinites
description Subduction processes regulate elemental cycling and consequently the composition of Earth’s geochemical reservoirs - mantle, crust, atmosphere, and hydrosphere, exerting far-reaching effects for the evolution of life. Barium (Ba) is essential for understanding crust-mantle recycling, especially since over 90 % of Ba in arc lavas originates from subducted materials. While Ba enrichments in arc lavas have long been attributed to contributions from oceanic crust derived aqueous fluids, recent studies highlight hydrous sediment melts as a key carrier. Here, we present high-precision Ba isotope data (δ138/134Ba) of input and output from the Tongan subduction zone. The results show that Ba is not predominantly supplied by the subducting oceanic crust. Instead, most Ba can be traced back to subducting sediments from which it is released in two stages. During early subduction, sedimentary barite dissolves and releases isotopically heavy Ba via aqueous fluids into the serpentinized mantle wedge, where this Ba is later remobilized during subsequent breakdown. With continued slab descent, remaining lithogenic phengite releases isotopically lighter Ba, which is recycled at subarc depths by hydrous melting. Both mechanisms can explain the entire range of Ba/Th and δ138/134Ba in Tongan arc lavas without requiring Ba isotope fractionation between fluids and solids. These results from the endmember setting of Tonga, with minimal subducting sediments, imply higher proportion of sediment-derived Ba in other arcs worldwide. The Forearc Serpentinite Signature (FSS), which is created by the interaction of the mantle wedge with sediment-derived fluids at low temperatures (<600 °C), represents an additional fluid endmember that must be considered in the genesis of arc lavas. Lithogenic Ba that is not completely released at subarc depths can be further subducted into the deeper mantle, where it may later enrich mantle domains that source mid-ocean ridge and hotspot lavas. The relative proportions of sedimentary components in subducted slabs have changed over Earth’s history, highlighting the link between arc magma and mantle compositions and long-term shifts in Earth’s surface (bio)geochemical cycles.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
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/10261/411706
https://doi.org/10.1016/j.epsl.2025.119789
url http://hdl.handle.net/10261/411706
https://doi.org/10.1016/j.epsl.2025.119789
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
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info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-122793NB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PTA2022-021985-I
https://doi.org/10.1016/j.epsl.2025.119789
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dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
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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spelling Isotopic constraints on the Barium subduction cycleAhmad, QasidWille, MartinRosca, CarolinaPettke, ThomasHermann, JörgKönig, StephanBariumTongaArc lavaSubduction recyclingSedimentsSerpentinitesSubduction processes regulate elemental cycling and consequently the composition of Earth’s geochemical reservoirs - mantle, crust, atmosphere, and hydrosphere, exerting far-reaching effects for the evolution of life. Barium (Ba) is essential for understanding crust-mantle recycling, especially since over 90 % of Ba in arc lavas originates from subducted materials. While Ba enrichments in arc lavas have long been attributed to contributions from oceanic crust derived aqueous fluids, recent studies highlight hydrous sediment melts as a key carrier. Here, we present high-precision Ba isotope data (δ138/134Ba) of input and output from the Tongan subduction zone. The results show that Ba is not predominantly supplied by the subducting oceanic crust. Instead, most Ba can be traced back to subducting sediments from which it is released in two stages. During early subduction, sedimentary barite dissolves and releases isotopically heavy Ba via aqueous fluids into the serpentinized mantle wedge, where this Ba is later remobilized during subsequent breakdown. With continued slab descent, remaining lithogenic phengite releases isotopically lighter Ba, which is recycled at subarc depths by hydrous melting. Both mechanisms can explain the entire range of Ba/Th and δ138/134Ba in Tongan arc lavas without requiring Ba isotope fractionation between fluids and solids. These results from the endmember setting of Tonga, with minimal subducting sediments, imply higher proportion of sediment-derived Ba in other arcs worldwide. The Forearc Serpentinite Signature (FSS), which is created by the interaction of the mantle wedge with sediment-derived fluids at low temperatures (<600 °C), represents an additional fluid endmember that must be considered in the genesis of arc lavas. Lithogenic Ba that is not completely released at subarc depths can be further subducted into the deeper mantle, where it may later enrich mantle domains that source mid-ocean ridge and hotspot lavas. The relative proportions of sedimentary components in subducted slabs have changed over Earth’s history, highlighting the link between arc magma and mantle compositions and long-term shifts in Earth’s surface (bio)geochemical cycles.This work was funded by the Swiss National Science Foundation, Switzerland (Grant 182508) to MW. SK and CR acknowledge ERC Starting Grant 636808 to SK (O2RIGIN). The Ramón y Cajal fellowship RYC2020–030014-I and grant PID2021–122793NB-I00 to SK are also acknowledged. The MC-ICP-MS at the Institute of Geological Sciences, University of Bern, used in this study was acquired within the framework of the NCCR project PlanetS funded by the Swiss National Science Foundation (Grant 1NF40–141881). SK thanks the Tongan Geological Services for logistical support during the sampling campaign. CR further acknowledges grant PTA2022–021985-I funded by MICIU/AEI/10.13039/501100011033 and by FSE+.Peer reviewedElsevier BVSwiss National Science FoundationMinisterio de Ciencia, Innovación y Universidades (España)Agencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/411706https://doi.org/10.1016/j.epsl.2025.119789reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-122793NB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PTA2022-021985-Ihttps://doi.org/10.1016/j.epsl.2025.119789Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4117062026-05-22T06:33:51Z
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