Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)

Upper Paleozoic, probably Permian, komatiites have been found in the Paleo-Tethys suture zone in NE Iran. These rocks are divided into three groups: (i) differentiated and undifferentiated komatiite lava flows, (ii) komatiitic basalts, and (iii) ultramafic-mafic pillow lavas. The rocks have a wide r...

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Autores: Mobasheri, Mohsen, Arndt, Nicholas, Cordier, Carole, Sobolev, Alexander, Ghasemi, Habibollah, Marchesi, Claudio, Sabzehei, Mossaieb, Garrido, Carlos J.
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:10261/383006
Acceso en línea:http://hdl.handle.net/10261/383006
Access Level:acceso abierto
Palabra clave:Hydrous peridotite
Komatiite
Mantle melting
Spinifex
Upper paleozoic
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spelling Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)Mobasheri, MohsenArndt, NicholasCordier, CaroleSobolev, AlexanderGhasemi, HabibollahMarchesi, ClaudioSabzehei, MossaiebGarrido, Carlos J.Hydrous peridotiteKomatiiteMantle meltingSpinifexUpper paleozoicUpper Paleozoic, probably Permian, komatiites have been found in the Paleo-Tethys suture zone in NE Iran. These rocks are divided into three groups: (i) differentiated and undifferentiated komatiite lava flows, (ii) komatiitic basalts, and (iii) ultramafic-mafic pillow lavas. The rocks have a wide range of textures including random olivine spinifex, layered olivine spinifex, random and string-beef pyroxene spinifex, micrographic intergrowths of plagioclase and clinopyroxene, and cumulate textures. MgO contents range from 7.1 wt % in basalts and gabbros in differentiated flows to 38.0 wt % in cumulates, flow margins and samples with olivine spinifex textures. The MgO content of the parental melt is estimated using the Fo content of olivine (89-91) to be between 20 and 25 wt %, and the higher MgO content in spinifex samples (30 to 36 wt %) is attributed to accumulation of olivine. The rocks have low Al2O3/TiO2 and are relatively depleted in heavy rare earth elements. They, therefore, are classified as Al-depleted komatiite, the first report of this magma type in a Phanerozoic locality. These characteristics are attributed to the presence of garnet in the source during mantle melting and melt extraction. The rocks also have relatively low contents of the more incompatible trace elements indicating derivation from a depleted source. Our study indicates that the parental magma formed by 10% to (about) 20% partial melting in a mantle plume at pressures of about 4 to 5 GPa (depths of 120-150 km). Ascent of the plume into the Late Paleozoic subduction zone at the margin of the Paleo-Tethys Ocean is a possible petrogenetic model for the generation of these komatiites.This project received funding from the European Research Council under the European Union's Horizon 2020 program (grant agreement 856555).Oxford University PressEuropean Research CouncilEuropean CommissionConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/383006reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/856555http://dx.doi.org/10.1093/petrology/egae131Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3830062026-05-22T06:33:51Z
dc.title.none.fl_str_mv Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
title Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
spellingShingle Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
Mobasheri, Mohsen
Hydrous peridotite
Komatiite
Mantle melting
Spinifex
Upper paleozoic
title_short Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
title_full Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
title_fullStr Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
title_full_unstemmed Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
title_sort Petrogenesis and Geochemistry of Upper Paleozoic Komatiites (Mashhad, NE Iran)
dc.creator.none.fl_str_mv Mobasheri, Mohsen
Arndt, Nicholas
Cordier, Carole
Sobolev, Alexander
Ghasemi, Habibollah
Marchesi, Claudio
Sabzehei, Mossaieb
Garrido, Carlos J.
author Mobasheri, Mohsen
author_facet Mobasheri, Mohsen
Arndt, Nicholas
Cordier, Carole
Sobolev, Alexander
Ghasemi, Habibollah
Marchesi, Claudio
Sabzehei, Mossaieb
Garrido, Carlos J.
author_role author
author2 Arndt, Nicholas
Cordier, Carole
Sobolev, Alexander
Ghasemi, Habibollah
Marchesi, Claudio
Sabzehei, Mossaieb
Garrido, Carlos J.
author2_role author
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 Hydrous peridotite
Komatiite
Mantle melting
Spinifex
Upper paleozoic
topic Hydrous peridotite
Komatiite
Mantle melting
Spinifex
Upper paleozoic
description Upper Paleozoic, probably Permian, komatiites have been found in the Paleo-Tethys suture zone in NE Iran. These rocks are divided into three groups: (i) differentiated and undifferentiated komatiite lava flows, (ii) komatiitic basalts, and (iii) ultramafic-mafic pillow lavas. The rocks have a wide range of textures including random olivine spinifex, layered olivine spinifex, random and string-beef pyroxene spinifex, micrographic intergrowths of plagioclase and clinopyroxene, and cumulate textures. MgO contents range from 7.1 wt % in basalts and gabbros in differentiated flows to 38.0 wt % in cumulates, flow margins and samples with olivine spinifex textures. The MgO content of the parental melt is estimated using the Fo content of olivine (89-91) to be between 20 and 25 wt %, and the higher MgO content in spinifex samples (30 to 36 wt %) is attributed to accumulation of olivine. The rocks have low Al2O3/TiO2 and are relatively depleted in heavy rare earth elements. They, therefore, are classified as Al-depleted komatiite, the first report of this magma type in a Phanerozoic locality. These characteristics are attributed to the presence of garnet in the source during mantle melting and melt extraction. The rocks also have relatively low contents of the more incompatible trace elements indicating derivation from a depleted source. Our study indicates that the parental magma formed by 10% to (about) 20% partial melting in a mantle plume at pressures of about 4 to 5 GPa (depths of 120-150 km). Ascent of the plume into the Late Paleozoic subduction zone at the margin of the Paleo-Tethys Ocean is a possible petrogenetic model for the generation of these komatiites.
publishDate 2025
dc.date.none.fl_str_mv 2025
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/10261/383006
url http://hdl.handle.net/10261/383006
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/H2020/856555
http://dx.doi.org/10.1093/petrology/egae131
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
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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score 15,812429

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