Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning

Earth's long-term cycling of carbon is regulated from mid-ocean ridges to convergent plate boundaries by mass transfers involving mantle rocks. Here we examine the conversion of peridotite to listvenite (magnesite + quartz rock) during CO2 metasomatism along the basal thrust of the Semail Ophio...

ver descrição completa

Detalhes bibliográficos
Autores: Decrausaz, Thierry, Godard, Marguerite, Menzel, Manuel D., Parat, Fleurice, Oliot, Emilien, Lafay, Romain, Barou, Fabrice
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2023
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/346006
Acesso em linha:http://hdl.handle.net/10261/346006
Access Level:Acceso aberto
Palavra-chave:Oman
Semail Ophiolite
Iron oxides
Magnesite
Quartz
Serpentine
Textures
Zoning
id ES_10043b1168e0747eeec49ff2cd0be7ee
oai_identifier_str oai:digital.csic.es:10261/346006
network_acronym_str ES
network_name_str España
repository_id_str
spelling Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoningDecrausaz, ThierryGodard, MargueriteMenzel, Manuel D.Parat, FleuriceOliot, EmilienLafay, RomainBarou, FabriceOmanSemail OphioliteIron oxidesMagnesiteQuartzSerpentineTexturesZoningEarth's long-term cycling of carbon is regulated from mid-ocean ridges to convergent plate boundaries by mass transfers involving mantle rocks. Here we examine the conversion of peridotite to listvenite (magnesite + quartz rock) during CO2 metasomatism along the basal thrust of the Semail Ophiolite (Fanja, Sultanate of Oman). At the outcrop scale, this transformation defines reaction zones, from serpentinized peridotites to carbonated serpentinites and listvenites. Based on a detailed petrological and chemical study, we show that carbonation progressed through three main stages involving the development of replacive textures ascribed to early stages, whilst carbonate (± quartz) veining becomes predominant in the last stage. The pervasive replacement of serpentine by magnesite is characterized by the formation of spheroids, among which two types are identified based on the composition of their core regions: Fe-core and Mg-core spheroids. Fe zoning is a type feature of matrix and vein magnesite formed during the onset carbonation (Stage 1). While Fe-rich magnesite is predicted to form at low fluid XCO2 from a poorly to moderately oxidized protolith, our study evidences that the local non-redox destabilization of Fe oxides into Fe-rich magnesite is essential to the development of Fe-core spheroids. The formation of Fe-core spheroids is followed by the pervasive (over-)growth of Mg-rich spheroids and aggregates (Stage 2) at near-equilibrium conditions in response to increasing fluid XCO2. Furthermore, the compositions of carbonates indicate that most siderophile transition elements released by the dissolution of primary minerals are locally trapped in carbonate and oxides during matrix carbonation, while elements with a chalcophile affinity are the most likely to be leached out of reaction zones.This research has been supported by the Agence Nationale de la Recherche (grant no. ANR-18-CE01-0014-01 LISZT), the German Research Foundation (grants nos. UR64/20-1 and UR 64/17-1) and the Junta de Andalucía (Consejeria de Conocimiento y Universidades) (postdoctoral fellowship grant no. Postdoc_21_00791).Peer reviewedCopernicus PublicationsMinisterio de Ciencia, Innovación y Universidades (España)Junta de AndalucíaNational Science Foundation (US)European Research CouncilAgence Nationale de la Recherche (France)Japan Society for the Promotion of ScienceGerman Research FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2024202420232024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/346006reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.5194/ejm-35-171-2023Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3460062026-05-22T06:33:51Z
dc.title.none.fl_str_mv Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
title Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
spellingShingle Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
Decrausaz, Thierry
Oman
Semail Ophiolite
Iron oxides
Magnesite
Quartz
Serpentine
Textures
Zoning
title_short Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
title_full Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
title_fullStr Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
title_full_unstemmed Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
title_sort Pervasive carbonation of peridotite to listvenite (Semail Ophiolite, Sultanate of Oman): clues from iron partitioning and chemical zoning
dc.creator.none.fl_str_mv Decrausaz, Thierry
Godard, Marguerite
Menzel, Manuel D.
Parat, Fleurice
Oliot, Emilien
Lafay, Romain
Barou, Fabrice
author Decrausaz, Thierry
author_facet Decrausaz, Thierry
Godard, Marguerite
Menzel, Manuel D.
Parat, Fleurice
Oliot, Emilien
Lafay, Romain
Barou, Fabrice
author_role author
author2 Godard, Marguerite
Menzel, Manuel D.
Parat, Fleurice
Oliot, Emilien
Lafay, Romain
Barou, Fabrice
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia, Innovación y Universidades (España)
Junta de Andalucía
National Science Foundation (US)
European Research Council
Agence Nationale de la Recherche (France)
Japan Society for the Promotion of Science
German Research Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Oman
Semail Ophiolite
Iron oxides
Magnesite
Quartz
Serpentine
Textures
Zoning
topic Oman
Semail Ophiolite
Iron oxides
Magnesite
Quartz
Serpentine
Textures
Zoning
description Earth's long-term cycling of carbon is regulated from mid-ocean ridges to convergent plate boundaries by mass transfers involving mantle rocks. Here we examine the conversion of peridotite to listvenite (magnesite + quartz rock) during CO2 metasomatism along the basal thrust of the Semail Ophiolite (Fanja, Sultanate of Oman). At the outcrop scale, this transformation defines reaction zones, from serpentinized peridotites to carbonated serpentinites and listvenites. Based on a detailed petrological and chemical study, we show that carbonation progressed through three main stages involving the development of replacive textures ascribed to early stages, whilst carbonate (± quartz) veining becomes predominant in the last stage. The pervasive replacement of serpentine by magnesite is characterized by the formation of spheroids, among which two types are identified based on the composition of their core regions: Fe-core and Mg-core spheroids. Fe zoning is a type feature of matrix and vein magnesite formed during the onset carbonation (Stage 1). While Fe-rich magnesite is predicted to form at low fluid XCO2 from a poorly to moderately oxidized protolith, our study evidences that the local non-redox destabilization of Fe oxides into Fe-rich magnesite is essential to the development of Fe-core spheroids. The formation of Fe-core spheroids is followed by the pervasive (over-)growth of Mg-rich spheroids and aggregates (Stage 2) at near-equilibrium conditions in response to increasing fluid XCO2. Furthermore, the compositions of carbonates indicate that most siderophile transition elements released by the dissolution of primary minerals are locally trapped in carbonate and oxides during matrix carbonation, while elements with a chalcophile affinity are the most likely to be leached out of reaction zones.
publishDate 2023
dc.date.none.fl_str_mv 2023
2024
2024
2024
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/10261/346006
url http://hdl.handle.net/10261/346006
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.5194/ejm-35-171-2023
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Copernicus Publications
publisher.none.fl_str_mv Copernicus Publications
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
_version_ 1869403486166188032
score 15,812455

Registros relacionados