Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain

Graphite is found dispersed in high-grade metapelitic rocks of the Anatectic Complex of Toledo (ACT) and was mined during the mid twentieth century in places where it has been concentrated (Guadamur and la Puebla de Montalbán mines). Some samples from these mines show variable but significant altera...

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Detalhes bibliográficos
Autores: Martín-Méndez, Iván, Boixereu Vila, Ester, Villaseca, Carlos
Formato: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2015
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/126953
Acesso em linha:http://hdl.handle.net/10261/126953
Access Level:acceso abierto
Palavra-chave:Graphite
XRD
Raman spectra
Carbon isotopes
Variscan granulites
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spelling Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central SpainMartín-Méndez, IvánBoixereu Vila, EsterVillaseca, CarlosGraphiteXRDRaman spectraCarbon isotopesVariscan granulitesGraphite is found dispersed in high-grade metapelitic rocks of the Anatectic Complex of Toledo (ACT) and was mined during the mid twentieth century in places where it has been concentrated (Guadamur and la Puebla de Montalbán mines). Some samples from these mines show variable but significant alteration intensity, reaching very low-T hydrothermal (supergene) conditions for some samples from the waste heap of the Guadamur site (<100 °C and 1 kbar). Micro-Raman and XRD data indicate that all the studied ACT graphite is of high crystallinity irrespective of the degree of hydrothermal alteration. Chemical differences were obtained for graphite δ13C composition. ACT granulitic graphite shows δ13CPDB values in the range of −20.5 to −27.8 ‰, indicating a biogenic origin. Interaction of graphite with hydrothermal fluids does not modify isotopic compositions even in the most transformed samples from mining sites. The different isotopic signatures of graphite from the mining sites reflect its contrasted primary carbon source. The high crystallinity of studied graphite makes this area of central Spain suitable for graphitic exploration and its potential exploitation, due to the low carbon content required for its viability and its strategic applications in advanced technologies, such as graphene synthesis.This work is included in the objectives of, and supported by, the CGL2012-32822 project of the Ministerio de Economía y Competitividad of Spain and the 910492-UCM group.Peer reviewedSpringer NatureMinisterio de Economía y Competitividad (España)Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201520152015info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionhttp://hdl.handle.net/10261/126953reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1007/s00126-015-0625-9Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1269532026-05-22T06:33:51Z
dc.title.none.fl_str_mv Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
title Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
spellingShingle Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
Martín-Méndez, Iván
Graphite
XRD
Raman spectra
Carbon isotopes
Variscan granulites
title_short Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
title_full Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
title_fullStr Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
title_full_unstemmed Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
title_sort Mineralogical and isotopic characterization of graphite deposits from the Anatectic Complex of Toledo, central Spain
dc.creator.none.fl_str_mv Martín-Méndez, Iván
Boixereu Vila, Ester
Villaseca, Carlos
author Martín-Méndez, Iván
author_facet Martín-Méndez, Iván
Boixereu Vila, Ester
Villaseca, Carlos
author_role author
author2 Boixereu Vila, Ester
Villaseca, Carlos
author2_role author
author
dc.contributor.none.fl_str_mv Ministerio de Economía y Competitividad (España)
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Graphite
XRD
Raman spectra
Carbon isotopes
Variscan granulites
topic Graphite
XRD
Raman spectra
Carbon isotopes
Variscan granulites
description Graphite is found dispersed in high-grade metapelitic rocks of the Anatectic Complex of Toledo (ACT) and was mined during the mid twentieth century in places where it has been concentrated (Guadamur and la Puebla de Montalbán mines). Some samples from these mines show variable but significant alteration intensity, reaching very low-T hydrothermal (supergene) conditions for some samples from the waste heap of the Guadamur site (<100 °C and 1 kbar). Micro-Raman and XRD data indicate that all the studied ACT graphite is of high crystallinity irrespective of the degree of hydrothermal alteration. Chemical differences were obtained for graphite δ13C composition. ACT granulitic graphite shows δ13CPDB values in the range of −20.5 to −27.8 ‰, indicating a biogenic origin. Interaction of graphite with hydrothermal fluids does not modify isotopic compositions even in the most transformed samples from mining sites. The different isotopic signatures of graphite from the mining sites reflect its contrasted primary carbon source. The high crystallinity of studied graphite makes this area of central Spain suitable for graphitic exploration and its potential exploitation, due to the low carbon content required for its viability and its strategic applications in advanced technologies, such as graphene synthesis.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015
2015
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/10261/126953
url http://hdl.handle.net/10261/126953
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1007/s00126-015-0625-9
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Springer Nature
publisher.none.fl_str_mv Springer Nature
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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