Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues

The budget of Se-Te and other highly siderophile elements (HSEs) in major silicate and oxide mineral separates (olivine, orthopyroxene, clinopyroxene, spinel), and intergranular fine components of an ultra-refractory harzburgite have been determined via isotope dilution hydride generation ICPMS afte...

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Autores: König, Stephan, Lissner, Moritz, Lorand, Jean Pierre, Bragagni, Alessandro, Luguet, Ambre
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/414762
Acceso en línea:http://hdl.handle.net/10261/414762
https://doi.org/10.1016/j.chemgeo.2014.12.015
Access Level:acceso abierto
Palabra clave:Peridotites
Selenium
Tellurium
Highly siderophile elements
Volatiles
MORB
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spelling Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residuesKönig, StephanLissner, MoritzLorand, Jean PierreBragagni, AlessandroLuguet, AmbrePeridotitesSeleniumTelluriumHighly siderophile elementsVolatilesMORBThe budget of Se-Te and other highly siderophile elements (HSEs) in major silicate and oxide mineral separates (olivine, orthopyroxene, clinopyroxene, spinel), and intergranular fine components of an ultra-refractory harzburgite have been determined via isotope dilution hydride generation ICPMS after mineral separation, high-pressure acid digestion and chemical purification. In addition, x-ray computed micro-tomography (micro-CT) has been performed in order to constrain and illustrate the original location, distribution and size of sulfides and/or alloys inside their intact, bulk harzburgite matrix. The results show that the whole-rock Se-Te budget of mantle residues, that are devoid of base metal sulfides (BMS) after high degrees of partial melting (F≈23%), is almost completely controlled by olivine-hosted micro-inclusions and intergranular fractions of platinum group minerals (PGMs). The scarcity and heterogeneous distribution of intergranular PGMs generally sized 3-5μm in the harzburgite are revealed by 3D micro-CT, while PGM inclusions in olivine are smaller than 2.5μm. The heterogeneous distribution of these microphases as well as the range of Se-Te contents in the bulk harzburgite complicate a quantification of individual contributions of separates to the whole-rock Se-Te budget. However, PGM micro-inclusions in olivine with residual-type CI chondrite-normalized HSE patterns and suprachondritic Se/Te ratios between 30 and 218 (Se/TeCI chondrite=9) host close to 100% of the bulk rock Se. Interstitial fine components up to 125μm grain size may contribute only minor amounts of Se, but up to 50% of Te to the bulk harzburgite and show subchondritic Se/Te ratios of ca. 4, resembling metasomatic PGM signatures. In dependence on increasing proportions of interstitial and metasomatic PGMs vs. olivine-hosted residual PGMs, the bulk rock Te contents may increase and the Se/Te ratios decrease. The systematics seen in mineral separates of one harzburgitic sample resembles the entire spectrum of Se-Te signatures of all suites of peridotites and host phases so far published. The results are consistent with a higher compatibility of Se in covalent monosulfides compared to Te that prefers sulfide melts. It is further consistent with the stabilization of residual PGMs after Mss exhaustion as well as with formation of metasomatic PGMs in a S-Cu-volatile-rich sulfide melt. Altogether this reconciles a higher incompatibility of Te over Se during partial mantle melting, subsequent removal of Te over Se with Cu-Ni-rich sulfide fractionation from high-degree partial mantle melts, and explains the similar Te but higher Se abundances in MORBs compared to peridotites that is globally observed.S. König acknowledges funding from the German Research Foundation (DFG grant KO40501-1/2 ).Peer reviewedElsevier BVGerman Research FoundationConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262015info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/414762https://doi.org/10.1016/j.chemgeo.2014.12.015reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.chemgeo.2014.12.015Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4147622026-05-22T06:33:51Z
dc.title.none.fl_str_mv Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
title Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
spellingShingle Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
König, Stephan
Peridotites
Selenium
Tellurium
Highly siderophile elements
Volatiles
MORB
title_short Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
title_full Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
title_fullStr Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
title_full_unstemmed Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
title_sort Mineralogical control of selenium, tellurium and highly siderophile elements in the Earth's mantle: Evidence from mineral separates of ultra-depleted mantle residues
dc.creator.none.fl_str_mv König, Stephan
Lissner, Moritz
Lorand, Jean Pierre
Bragagni, Alessandro
Luguet, Ambre
author König, Stephan
author_facet König, Stephan
Lissner, Moritz
Lorand, Jean Pierre
Bragagni, Alessandro
Luguet, Ambre
author_role author
author2 Lissner, Moritz
Lorand, Jean Pierre
Bragagni, Alessandro
Luguet, Ambre
author2_role author
author
author
author
dc.contributor.none.fl_str_mv German Research Foundation
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Peridotites
Selenium
Tellurium
Highly siderophile elements
Volatiles
MORB
topic Peridotites
Selenium
Tellurium
Highly siderophile elements
Volatiles
MORB
description The budget of Se-Te and other highly siderophile elements (HSEs) in major silicate and oxide mineral separates (olivine, orthopyroxene, clinopyroxene, spinel), and intergranular fine components of an ultra-refractory harzburgite have been determined via isotope dilution hydride generation ICPMS after mineral separation, high-pressure acid digestion and chemical purification. In addition, x-ray computed micro-tomography (micro-CT) has been performed in order to constrain and illustrate the original location, distribution and size of sulfides and/or alloys inside their intact, bulk harzburgite matrix. The results show that the whole-rock Se-Te budget of mantle residues, that are devoid of base metal sulfides (BMS) after high degrees of partial melting (F≈23%), is almost completely controlled by olivine-hosted micro-inclusions and intergranular fractions of platinum group minerals (PGMs). The scarcity and heterogeneous distribution of intergranular PGMs generally sized 3-5μm in the harzburgite are revealed by 3D micro-CT, while PGM inclusions in olivine are smaller than 2.5μm. The heterogeneous distribution of these microphases as well as the range of Se-Te contents in the bulk harzburgite complicate a quantification of individual contributions of separates to the whole-rock Se-Te budget. However, PGM micro-inclusions in olivine with residual-type CI chondrite-normalized HSE patterns and suprachondritic Se/Te ratios between 30 and 218 (Se/TeCI chondrite=9) host close to 100% of the bulk rock Se. Interstitial fine components up to 125μm grain size may contribute only minor amounts of Se, but up to 50% of Te to the bulk harzburgite and show subchondritic Se/Te ratios of ca. 4, resembling metasomatic PGM signatures. In dependence on increasing proportions of interstitial and metasomatic PGMs vs. olivine-hosted residual PGMs, the bulk rock Te contents may increase and the Se/Te ratios decrease. The systematics seen in mineral separates of one harzburgitic sample resembles the entire spectrum of Se-Te signatures of all suites of peridotites and host phases so far published. The results are consistent with a higher compatibility of Se in covalent monosulfides compared to Te that prefers sulfide melts. It is further consistent with the stabilization of residual PGMs after Mss exhaustion as well as with formation of metasomatic PGMs in a S-Cu-volatile-rich sulfide melt. Altogether this reconciles a higher incompatibility of Te over Se during partial mantle melting, subsequent removal of Te over Se with Cu-Ni-rich sulfide fractionation from high-degree partial mantle melts, and explains the similar Te but higher Se abundances in MORBs compared to peridotites that is globally observed.
publishDate 2015
dc.date.none.fl_str_mv 2015
2026
2026
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/414762
https://doi.org/10.1016/j.chemgeo.2014.12.015
url http://hdl.handle.net/10261/414762
https://doi.org/10.1016/j.chemgeo.2014.12.015
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.chemgeo.2014.12.015
Sí
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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