Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications

Chromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time. Santa Elena chromitites commonly display a compositional variation from extremely chromiferous (Cr/(Cr+Al)=0.81) to interme...

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Autores: Zaccarini, Federica, Garuti, G., Proenza Fernández, Joaquín Antonio, Campos, L., Thalhammer, Oskar A.R., Aiglsperger, Thomas Hans, Lewis, J. F.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/109002
Acceso en línea:https://hdl.handle.net/2445/109002
Access Level:acceso abierto
Palabra clave:Mineralogia
Platí
Costa Rica
Mineralogy
Platinum
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spelling Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implicationsZaccarini, FedericaGaruti, G.Proenza Fernández, Joaquín AntonioCampos, L.Thalhammer, Oskar A.R.Aiglsperger, Thomas HansLewis, J. F.MineralogiaPlatíCosta RicaMineralogyPlatinumCosta RicaChromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time. Santa Elena chromitites commonly display a compositional variation from extremely chromiferous (Cr/(Cr+Al)=0.81) to intermediate and aluminous (Cr/(Cr+Al)=0.54). This composition varies along a continuous trend, corresponding to calculated parental liquids which may have been derived from the differentiation of a single batch of boninitic magma with Cr-rich and (Al, Ti)-poor initial composition. Fractional precipitation of chromite probably occurred during differentiation of the boninitic melt and progressive metasomatic reaction with mantle peridotite. The distribution of platinum group elements (PGE) displays the high (Os+Ir+Ru)/(Rh+Pt+Pd) ratio typical of ophiolitic chromitites and, consistently, the platinum group minerals (PGM) encountered are mainly Ru-Os-Ir sulfides and arsenides. Textural relations of most of the platinum group elements suggest crystallization at magmatic temperatures, possibly under relatively high sulfur fugacity as indicated by the apparent lack of primary Os-Ir-Ru alloys. The chemical and mineralogical characteristics of chromitites from the Santa Elena ultramafic nappe have a strong affinity to podiform chromitites in the mantle section of supra-subduction-zone ophiolites. Calculated parental melts of the chromitites are consistent with the differentiation of arc-related magmas, and do not support the oceanic spreading center geodynamic setting previously proposed by some authors(UB). (ICTJA). (IDEA). (UAB). (CSIC)2017201720112017info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion17 p.application/pdfhttps://hdl.handle.net/2445/109002Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1344/105.000001696Geologica Acta, 2011, vol. 9, num. 3-4, p. 407-423https://doi.org/10.1344/105.000001696cc-by-sa (c) Zaccarini, F. et al., 2011http://creativecommons.org/licenses/by-sa/3.0/esinfo:eu-repo/semantics/openAccessoai:recercat.cat:2445/1090022026-05-29T05:05:01Z
dc.title.none.fl_str_mv Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
title Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
spellingShingle Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
Zaccarini, Federica
Mineralogia
Platí
Costa Rica
Mineralogy
Platinum
Costa Rica
title_short Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
title_full Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
title_fullStr Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
title_full_unstemmed Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
title_sort Chromite and platinum-group-elements mineralization in the Santa Elena ophiolitic ultramafic nappe (Costa Rica): geodynamic implications
dc.creator.none.fl_str_mv Zaccarini, Federica
Garuti, G.
Proenza Fernández, Joaquín Antonio
Campos, L.
Thalhammer, Oskar A.R.
Aiglsperger, Thomas Hans
Lewis, J. F.
author Zaccarini, Federica
author_facet Zaccarini, Federica
Garuti, G.
Proenza Fernández, Joaquín Antonio
Campos, L.
Thalhammer, Oskar A.R.
Aiglsperger, Thomas Hans
Lewis, J. F.
author_role author
author2 Garuti, G.
Proenza Fernández, Joaquín Antonio
Campos, L.
Thalhammer, Oskar A.R.
Aiglsperger, Thomas Hans
Lewis, J. F.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Mineralogia
Platí
Costa Rica
Mineralogy
Platinum
Costa Rica
topic Mineralogia
Platí
Costa Rica
Mineralogy
Platinum
Costa Rica
description Chromitites associated with strongly altered peridotite from six distinct localities in the Santa Elena ultramafic nappe (Costa Rica) have been investigated for the first time. Santa Elena chromitites commonly display a compositional variation from extremely chromiferous (Cr/(Cr+Al)=0.81) to intermediate and aluminous (Cr/(Cr+Al)=0.54). This composition varies along a continuous trend, corresponding to calculated parental liquids which may have been derived from the differentiation of a single batch of boninitic magma with Cr-rich and (Al, Ti)-poor initial composition. Fractional precipitation of chromite probably occurred during differentiation of the boninitic melt and progressive metasomatic reaction with mantle peridotite. The distribution of platinum group elements (PGE) displays the high (Os+Ir+Ru)/(Rh+Pt+Pd) ratio typical of ophiolitic chromitites and, consistently, the platinum group minerals (PGM) encountered are mainly Ru-Os-Ir sulfides and arsenides. Textural relations of most of the platinum group elements suggest crystallization at magmatic temperatures, possibly under relatively high sulfur fugacity as indicated by the apparent lack of primary Os-Ir-Ru alloys. The chemical and mineralogical characteristics of chromitites from the Santa Elena ultramafic nappe have a strong affinity to podiform chromitites in the mantle section of supra-subduction-zone ophiolites. Calculated parental melts of the chromitites are consistent with the differentiation of arc-related magmas, and do not support the oceanic spreading center geodynamic setting previously proposed by some authors
publishDate 2011
dc.date.none.fl_str_mv 2011
2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/109002
url https://hdl.handle.net/2445/109002
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1344/105.000001696
Geologica Acta, 2011, vol. 9, num. 3-4, p. 407-423
https://doi.org/10.1344/105.000001696
dc.rights.none.fl_str_mv cc-by-sa (c) Zaccarini, F. et al., 2011
http://creativecommons.org/licenses/by-sa/3.0/es
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc-by-sa (c) Zaccarini, F. et al., 2011
http://creativecommons.org/licenses/by-sa/3.0/es
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 17 p.
application/pdf
dc.publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
publisher.none.fl_str_mv (UB). (ICTJA). (IDEA). (UAB). (CSIC)
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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