Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)

Podiform chromitite bodies occur in highly serpentinized peridotites at Dobromirtsi Ultramafic Massif (Rhodope Mountains, southeastern Bulgaria). The ultramafic body is believed to represent a fragment of Palaeozoic ophiolite mantle. The ophiolite sequence is associated with greenschist - lower-temp...

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Autores: González Jiménez, José María, Kerestedjian, T., Proenza Fernández, Joaquín Antonio, Gervilla Linares, Fernando
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2009
País:España
Recursos:Universidad de Barcelona
Repositorio:Dipòsit Digital de la UB
OAI Identifier:oai:diposit.ub.edu:2445/16890
Acesso em linha:https://hdl.handle.net/2445/16890
Access Level:acceso abierto
Palavra-chave:Ofiolites
Cromita
Metamorfisme
Roques ultrabàsiques
Bulgària
Ophiolite
Chromite
Metamorphism
Ultrabasic rocks
Bulgaria
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spelling Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)González Jiménez, José MaríaKerestedjian, T.Proenza Fernández, Joaquín AntonioGervilla Linares, FernandoOfiolitesCromitaMetamorfismeRoques ultrabàsiquesBulgàriaOphioliteChromiteMetamorphismUltrabasic rocksBulgariaPodiform chromitite bodies occur in highly serpentinized peridotites at Dobromirtsi Ultramafic Massif (Rhodope Mountains, southeastern Bulgaria). The ultramafic body is believed to represent a fragment of Palaeozoic ophiolite mantle. The ophiolite sequence is associated with greenschist - lower-temperature amphibolite facies metamorphosed rocks (biotitic gneisses hosting amphibolite). This association suggests that peridotites, chromitites and metamorphic rocks underwent a common metamorphic evolution. Chromitites at Dobromirtsi have been strongly altered. Their degree of alteration depends on the chromite/silicate ratio and to a lesser extent, on the size of chromitite bodies. Alteration is recorded in individual chromite grains in the form of optical and chemical zoning. Core to rim chemical trends are expressed by MgO- and Al2O3- impoverishment, mainly compensated by FeO and/or Fe2O3 increases. Such chemical variations correspond with three main alteration events. The first one was associated with ocean-floor metamorphism and was characterized by a lizardite replacement of olivine and the absence of chromite alteration. The second event took place during greenchist facies metamorphism. During this event, MgO- and SiO2-rich fluids (derived from low temperature serpentinization of olivine and pyroxenes) reacted with chromite to form chlorite; as a consequence, chromite became altered to a FeO- and Cr2O3-rich, Al2O3-poor chromite. The third event, mainly developed during lower temperature amphibolite facies metamorphism, caused the replacement of the primary and previously altered chromite by Fe2O3-rich chromite (ferritchromite).Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)2009info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/16890Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)reponame:Dipòsit Digital de la UBinstname:Universidad de BarcelonaInglésReproducció del document publicat a http://doi.org/10.1344/104.000001447Geologica Acta, 2009, vol. 7, núm. 4, p. 413-429http://doi.org/10.1344/104.000001447cc by-sa (c) Gonzalez-Jimenez et al., 2009http://creativecommons.org/licenses/by-sa/3.0/es/info:eu-repo/semantics/openAccessoai:diposit.ub.edu:2445/168902026-05-27T06:46:51Z
dc.title.none.fl_str_mv Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
title Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
spellingShingle Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
González Jiménez, José María
Ofiolites
Cromita
Metamorfisme
Roques ultrabàsiques
Bulgària
Ophiolite
Chromite
Metamorphism
Ultrabasic rocks
Bulgaria
title_short Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
title_full Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
title_fullStr Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
title_full_unstemmed Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
title_sort Metamorphism on Chromite Ores from the Dobromirtsi ultramafic massif, Rhodope Mountains (SE Bulgaria)
dc.creator.none.fl_str_mv González Jiménez, José María
Kerestedjian, T.
Proenza Fernández, Joaquín Antonio
Gervilla Linares, Fernando
author González Jiménez, José María
author_facet González Jiménez, José María
Kerestedjian, T.
Proenza Fernández, Joaquín Antonio
Gervilla Linares, Fernando
author_role author
author2 Kerestedjian, T.
Proenza Fernández, Joaquín Antonio
Gervilla Linares, Fernando
author2_role author
author
author
dc.subject.none.fl_str_mv Ofiolites
Cromita
Metamorfisme
Roques ultrabàsiques
Bulgària
Ophiolite
Chromite
Metamorphism
Ultrabasic rocks
Bulgaria
topic Ofiolites
Cromita
Metamorfisme
Roques ultrabàsiques
Bulgària
Ophiolite
Chromite
Metamorphism
Ultrabasic rocks
Bulgaria
description Podiform chromitite bodies occur in highly serpentinized peridotites at Dobromirtsi Ultramafic Massif (Rhodope Mountains, southeastern Bulgaria). The ultramafic body is believed to represent a fragment of Palaeozoic ophiolite mantle. The ophiolite sequence is associated with greenschist - lower-temperature amphibolite facies metamorphosed rocks (biotitic gneisses hosting amphibolite). This association suggests that peridotites, chromitites and metamorphic rocks underwent a common metamorphic evolution. Chromitites at Dobromirtsi have been strongly altered. Their degree of alteration depends on the chromite/silicate ratio and to a lesser extent, on the size of chromitite bodies. Alteration is recorded in individual chromite grains in the form of optical and chemical zoning. Core to rim chemical trends are expressed by MgO- and Al2O3- impoverishment, mainly compensated by FeO and/or Fe2O3 increases. Such chemical variations correspond with three main alteration events. The first one was associated with ocean-floor metamorphism and was characterized by a lizardite replacement of olivine and the absence of chromite alteration. The second event took place during greenchist facies metamorphism. During this event, MgO- and SiO2-rich fluids (derived from low temperature serpentinization of olivine and pyroxenes) reacted with chromite to form chlorite; as a consequence, chromite became altered to a FeO- and Cr2O3-rich, Al2O3-poor chromite. The third event, mainly developed during lower temperature amphibolite facies metamorphism, caused the replacement of the primary and previously altered chromite by Fe2O3-rich chromite (ferritchromite).
publishDate 2009
dc.date.none.fl_str_mv 2009
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/2445/16890
url https://hdl.handle.net/2445/16890
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a http://doi.org/10.1344/104.000001447
Geologica Acta, 2009, vol. 7, núm. 4, p. 413-429
http://doi.org/10.1344/104.000001447
dc.rights.none.fl_str_mv cc by-sa (c) Gonzalez-Jimenez et al., 2009
http://creativecommons.org/licenses/by-sa/3.0/es/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv cc by-sa (c) Gonzalez-Jimenez et al., 2009
http://creativecommons.org/licenses/by-sa/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
publisher.none.fl_str_mv Universitat de Barcelona (UB). Institut de Ciències de la Terra Jaume Almera (ICTJA). Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDEA). Universitat Autonònoma de Barcelona (UAB). Consejo Superior de Investigaciones Científicas (CSIC)
dc.source.none.fl_str_mv Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)
reponame:Dipòsit Digital de la UB
instname:Universidad de Barcelona
instname_str Universidad de Barcelona
reponame_str Dipòsit Digital de la UB
collection Dipòsit Digital de la UB
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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