Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina

Autores
Proenza, J.; Zaccarini, F.; Escayola, M.; Cábana, C.; Schalamuk, Bernardo Isidoro; Garuti, G.
Año de publicación
2008
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Chromitite bodies hosted in the Neoproterozoic western ophiolitic belt of Pampean Ranges of Córdoba (Argentina) were studied at Los Congos and Los Guanacos ultramafic bodies, with regard to the composition and textures of the chromite and platinum group minerals. Primary chromite composition is only preserved in some massive chromitites from the Los Guanacos ultramafic body, and is similar to Al-rich ophiolitic chromitites, suggesting that they crystallized from melts with back arc basin basalts (BABB) affinity in the suprasubduction mantle. Subsequently, these chromitites underwent a prograde metamorphism. Chromites from chromitites and associated metamorphosed ultramafic rocks show complex replacement and exsolution textures. Mineral chemistry and texture indicate that the chromite composition records two main metamorphic trends. A first trend defined by chromite from massive chromitite, in which there is an enrichment in Fe3+ and Fe2+, Cr remain relatively constant, and slightly depleted in Al, Mg. A second trend is defined by chromite from disseminated chromitite and metamorphosed dunite and harzburgite, in which a Fe-rich phase is replacing the Al-rich chromite. This alteration trend is characterized by enrichment in the total iron content (Fe3++Fe2+) and a strong depletion in Al and Mg. The chemical composition of all analyzed spinels from Los Guanacos and Los Congos, as plotted on the ternary Fe3+–Cr–Al diagram, correlates well with the Cr-spinels from the upper amphibolite to granulite-facies metamorphism. Platinum group minerals (PGM) identified include native osmium, laurite, erlichmanite, irarsite, platinum and a number of inadequately identified phases such as an oxide or hydroxide of Ru, Pt and Ir–Ru, Pt telluride, Ir–Ru–As–Se and Ir–Ru–Ti compounds. Native osmium was the only PGMwhich remained unaltered; other PGMunderwentmineralogical reworking duringmetamorphism.Although it is difficult to establish the extent of platinum group element mobilization based on mineralogical observation, our results suggest that the Ru–Os–Ir PGM in the Los Guanacos and Los Congos chromitites were modified in situ, producing re-distribution of these PGE on a small scale. The presence of rare Pt and PGE–As–Se minerals was possibly related to remobilization of Pt, As and Se by fluids during the alteration processes.
Fil: Proenza, J.. Universidad de Barcelona; España
Fil: Zaccarini, F.. University of Leoben; Austria
Fil: Escayola, M.. University of Leoben; Austria
Fil: Cábana, C.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Garuti, G.. Università di Modena e Reggio Emilia; Italia
Materia
CHROMITE
PGM
OPHIOLITE
ARGENTINA; LOS GUANACOS; LOS CONGOS
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/242242

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network_name_str CONICET Digital (CONICET)
spelling Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, ArgentinaProenza, J.Zaccarini, F.Escayola, M.Cábana, C.Schalamuk, Bernardo IsidoroGaruti, G.CHROMITEPGMOPHIOLITEARGENTINA; LOS GUANACOS; LOS CONGOShttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1Chromitite bodies hosted in the Neoproterozoic western ophiolitic belt of Pampean Ranges of Córdoba (Argentina) were studied at Los Congos and Los Guanacos ultramafic bodies, with regard to the composition and textures of the chromite and platinum group minerals. Primary chromite composition is only preserved in some massive chromitites from the Los Guanacos ultramafic body, and is similar to Al-rich ophiolitic chromitites, suggesting that they crystallized from melts with back arc basin basalts (BABB) affinity in the suprasubduction mantle. Subsequently, these chromitites underwent a prograde metamorphism. Chromites from chromitites and associated metamorphosed ultramafic rocks show complex replacement and exsolution textures. Mineral chemistry and texture indicate that the chromite composition records two main metamorphic trends. A first trend defined by chromite from massive chromitite, in which there is an enrichment in Fe3+ and Fe2+, Cr remain relatively constant, and slightly depleted in Al, Mg. A second trend is defined by chromite from disseminated chromitite and metamorphosed dunite and harzburgite, in which a Fe-rich phase is replacing the Al-rich chromite. This alteration trend is characterized by enrichment in the total iron content (Fe3++Fe2+) and a strong depletion in Al and Mg. The chemical composition of all analyzed spinels from Los Guanacos and Los Congos, as plotted on the ternary Fe3+–Cr–Al diagram, correlates well with the Cr-spinels from the upper amphibolite to granulite-facies metamorphism. Platinum group minerals (PGM) identified include native osmium, laurite, erlichmanite, irarsite, platinum and a number of inadequately identified phases such as an oxide or hydroxide of Ru, Pt and Ir–Ru, Pt telluride, Ir–Ru–As–Se and Ir–Ru–Ti compounds. Native osmium was the only PGMwhich remained unaltered; other PGMunderwentmineralogical reworking duringmetamorphism.Although it is difficult to establish the extent of platinum group element mobilization based on mineralogical observation, our results suggest that the Ru–Os–Ir PGM in the Los Guanacos and Los Congos chromitites were modified in situ, producing re-distribution of these PGE on a small scale. The presence of rare Pt and PGE–As–Se minerals was possibly related to remobilization of Pt, As and Se by fluids during the alteration processes.Fil: Proenza, J.. Universidad de Barcelona; EspañaFil: Zaccarini, F.. University of Leoben; AustriaFil: Escayola, M.. University of Leoben; AustriaFil: Cábana, C.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; ArgentinaFil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; ArgentinaFil: Garuti, G.. Università di Modena e Reggio Emilia; ItaliaElsevier Science2008-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/242242Proenza, J.; Zaccarini, F.; Escayola, M.; Cábana, C.; Schalamuk, Bernardo Isidoro; et al.; Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina; Elsevier Science; Ore Geology Reviews; 33; 1; 4-2008; 32-480169-1368CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169136807000194info:eu-repo/semantics/altIdentifier/doi//10.1016/j.oregeorev.2006.05.009info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:18:33Zoai:ri.conicet.gov.ar:11336/242242instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:18:33.427CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
title Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
spellingShingle Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
Proenza, J.
CHROMITE
PGM
OPHIOLITE
ARGENTINA; LOS GUANACOS; LOS CONGOS
title_short Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
title_full Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
title_fullStr Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
title_full_unstemmed Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
title_sort Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina
dc.creator.none.fl_str_mv Proenza, J.
Zaccarini, F.
Escayola, M.
Cábana, C.
Schalamuk, Bernardo Isidoro
Garuti, G.
author Proenza, J.
author_facet Proenza, J.
Zaccarini, F.
Escayola, M.
Cábana, C.
Schalamuk, Bernardo Isidoro
Garuti, G.
author_role author
author2 Zaccarini, F.
Escayola, M.
Cábana, C.
Schalamuk, Bernardo Isidoro
Garuti, G.
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv CHROMITE
PGM
OPHIOLITE
ARGENTINA; LOS GUANACOS; LOS CONGOS
topic CHROMITE
PGM
OPHIOLITE
ARGENTINA; LOS GUANACOS; LOS CONGOS
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Chromitite bodies hosted in the Neoproterozoic western ophiolitic belt of Pampean Ranges of Córdoba (Argentina) were studied at Los Congos and Los Guanacos ultramafic bodies, with regard to the composition and textures of the chromite and platinum group minerals. Primary chromite composition is only preserved in some massive chromitites from the Los Guanacos ultramafic body, and is similar to Al-rich ophiolitic chromitites, suggesting that they crystallized from melts with back arc basin basalts (BABB) affinity in the suprasubduction mantle. Subsequently, these chromitites underwent a prograde metamorphism. Chromites from chromitites and associated metamorphosed ultramafic rocks show complex replacement and exsolution textures. Mineral chemistry and texture indicate that the chromite composition records two main metamorphic trends. A first trend defined by chromite from massive chromitite, in which there is an enrichment in Fe3+ and Fe2+, Cr remain relatively constant, and slightly depleted in Al, Mg. A second trend is defined by chromite from disseminated chromitite and metamorphosed dunite and harzburgite, in which a Fe-rich phase is replacing the Al-rich chromite. This alteration trend is characterized by enrichment in the total iron content (Fe3++Fe2+) and a strong depletion in Al and Mg. The chemical composition of all analyzed spinels from Los Guanacos and Los Congos, as plotted on the ternary Fe3+–Cr–Al diagram, correlates well with the Cr-spinels from the upper amphibolite to granulite-facies metamorphism. Platinum group minerals (PGM) identified include native osmium, laurite, erlichmanite, irarsite, platinum and a number of inadequately identified phases such as an oxide or hydroxide of Ru, Pt and Ir–Ru, Pt telluride, Ir–Ru–As–Se and Ir–Ru–Ti compounds. Native osmium was the only PGMwhich remained unaltered; other PGMunderwentmineralogical reworking duringmetamorphism.Although it is difficult to establish the extent of platinum group element mobilization based on mineralogical observation, our results suggest that the Ru–Os–Ir PGM in the Los Guanacos and Los Congos chromitites were modified in situ, producing re-distribution of these PGE on a small scale. The presence of rare Pt and PGE–As–Se minerals was possibly related to remobilization of Pt, As and Se by fluids during the alteration processes.
Fil: Proenza, J.. Universidad de Barcelona; España
Fil: Zaccarini, F.. University of Leoben; Austria
Fil: Escayola, M.. University of Leoben; Austria
Fil: Cábana, C.. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina
Fil: Schalamuk, Bernardo Isidoro. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Instituto de Recursos Minerales. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Recursos Minerales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina
Fil: Garuti, G.. Università di Modena e Reggio Emilia; Italia
description Chromitite bodies hosted in the Neoproterozoic western ophiolitic belt of Pampean Ranges of Córdoba (Argentina) were studied at Los Congos and Los Guanacos ultramafic bodies, with regard to the composition and textures of the chromite and platinum group minerals. Primary chromite composition is only preserved in some massive chromitites from the Los Guanacos ultramafic body, and is similar to Al-rich ophiolitic chromitites, suggesting that they crystallized from melts with back arc basin basalts (BABB) affinity in the suprasubduction mantle. Subsequently, these chromitites underwent a prograde metamorphism. Chromites from chromitites and associated metamorphosed ultramafic rocks show complex replacement and exsolution textures. Mineral chemistry and texture indicate that the chromite composition records two main metamorphic trends. A first trend defined by chromite from massive chromitite, in which there is an enrichment in Fe3+ and Fe2+, Cr remain relatively constant, and slightly depleted in Al, Mg. A second trend is defined by chromite from disseminated chromitite and metamorphosed dunite and harzburgite, in which a Fe-rich phase is replacing the Al-rich chromite. This alteration trend is characterized by enrichment in the total iron content (Fe3++Fe2+) and a strong depletion in Al and Mg. The chemical composition of all analyzed spinels from Los Guanacos and Los Congos, as plotted on the ternary Fe3+–Cr–Al diagram, correlates well with the Cr-spinels from the upper amphibolite to granulite-facies metamorphism. Platinum group minerals (PGM) identified include native osmium, laurite, erlichmanite, irarsite, platinum and a number of inadequately identified phases such as an oxide or hydroxide of Ru, Pt and Ir–Ru, Pt telluride, Ir–Ru–As–Se and Ir–Ru–Ti compounds. Native osmium was the only PGMwhich remained unaltered; other PGMunderwentmineralogical reworking duringmetamorphism.Although it is difficult to establish the extent of platinum group element mobilization based on mineralogical observation, our results suggest that the Ru–Os–Ir PGM in the Los Guanacos and Los Congos chromitites were modified in situ, producing re-distribution of these PGE on a small scale. The presence of rare Pt and PGE–As–Se minerals was possibly related to remobilization of Pt, As and Se by fluids during the alteration processes.
publishDate 2008
dc.date.none.fl_str_mv 2008-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/242242
Proenza, J.; Zaccarini, F.; Escayola, M.; Cábana, C.; Schalamuk, Bernardo Isidoro; et al.; Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina; Elsevier Science; Ore Geology Reviews; 33; 1; 4-2008; 32-48
0169-1368
CONICET Digital
CONICET
url http://hdl.handle.net/11336/242242
identifier_str_mv Proenza, J.; Zaccarini, F.; Escayola, M.; Cábana, C.; Schalamuk, Bernardo Isidoro; et al.; Composition and textures of chromite and platinum-group minerals in chromitites of the western ophiolitic belt from Pampean Ranges of Córdoba, Argentina; Elsevier Science; Ore Geology Reviews; 33; 1; 4-2008; 32-48
0169-1368
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169136807000194
info:eu-repo/semantics/altIdentifier/doi//10.1016/j.oregeorev.2006.05.009
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application/pdf
dc.publisher.none.fl_str_mv Elsevier Science
publisher.none.fl_str_mv Elsevier Science
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repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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