Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient

Black quartzites and migmatitic orthogneisses from the Mina Afortunada dome have been analysed through quartz and graphite petrofabric analysis and Raman microspectrometry on graphitized carbonaceous material. The results permit us to recognize a deformation temperature increase from the dome envelo...

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Detalles Bibliográficos
Autores: Puelles Olarte, Pablo, Abalos Villaro, Benito
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/69671
Acceso en línea:http://hdl.handle.net/10810/69671
Access Level:acceso abierto
Palabra clave:mid-lower continental crust
gneiss dome
thermal gradient
petrofabric
Raman microspectroscopy
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spelling Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradientPuelles Olarte, PabloAbalos Villaro, Benitomid-lower continental crustgneiss domethermal gradientpetrofabricRaman microspectroscopyBlack quartzites and migmatitic orthogneisses from the Mina Afortunada dome have been analysed through quartz and graphite petrofabric analysis and Raman microspectrometry on graphitized carbonaceous material. The results permit us to recognize a deformation temperature increase from the dome envelope towards its core marking the transition from basal-<a> to rhomb-<a> quartz intracrystalline slip systems at maximum T of 475 °C, and from rhomb-<a> to prism-<a> at maximum T of 515 °C. The complementary petrofabric and Raman study on graphite discloses a change from basal to prismatic <a> slip systems at maximum T of ca. 470 °C, accompanied by a strengthening of its structural order. The Raman study of large graphite grains revealed a non-random crystallinity organization in them, with domains of weaker lattice structural order (reflecting lower formation T) in core areas and higher crystallinity sectors (higher formation T) at the rims. This finding might reflect a shielding effect during prograde metamorphism, the rim material preventing grain core material from reorganization and increase in its crystallinity. This study shows also that graphite can be a good candidate for pressure-temperature-time path reconstruction in metamorphosed organic-rich rocks.S. Fernández-Armas (Electronic Microscopy and Material Microanalysis, SGIker-UPV/EHU facility) and A. Sarmiento (Raman-LASPEA Coupled Multispectroscopy Singular Laboratory, SGIker-UPV/EHU facility) are thanked for their technical assistance in EBSD and Raman spectrometric data acquisition, respectively. The constructive reviews of V. Toy, B. Lacroix and an anonymous referee contributed to improve the original version of this article and are sincerely acknowledged. Financial support was provided by the UPV/EHU (GIU20/010).Elsevier202420242024info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/69671reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://www.sciencedirect.com/science/article/pii/S0191814124001883info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc/3.0/es/© 2024 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC license (http://creativecommons.org/licenses/by- nc/4.0/).Atribución-NoComercial 3.0 Españaoai:addi.ehu.eus:10810/696712026-06-18T09:23:17Z
dc.title.none.fl_str_mv Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
title Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
spellingShingle Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
Puelles Olarte, Pablo
mid-lower continental crust
gneiss dome
thermal gradient
petrofabric
Raman microspectroscopy
title_short Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
title_full Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
title_fullStr Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
title_full_unstemmed Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
title_sort Petrofabric and Raman microspectroscopy study of the Mina Afortunada gneiss dome: Mapping its thermal gradient
dc.creator.none.fl_str_mv Puelles Olarte, Pablo
Abalos Villaro, Benito
author Puelles Olarte, Pablo
author_facet Puelles Olarte, Pablo
Abalos Villaro, Benito
author_role author
author2 Abalos Villaro, Benito
author2_role author
dc.subject.none.fl_str_mv mid-lower continental crust
gneiss dome
thermal gradient
petrofabric
Raman microspectroscopy
topic mid-lower continental crust
gneiss dome
thermal gradient
petrofabric
Raman microspectroscopy
description Black quartzites and migmatitic orthogneisses from the Mina Afortunada dome have been analysed through quartz and graphite petrofabric analysis and Raman microspectrometry on graphitized carbonaceous material. The results permit us to recognize a deformation temperature increase from the dome envelope towards its core marking the transition from basal-<a> to rhomb-<a> quartz intracrystalline slip systems at maximum T of 475 °C, and from rhomb-<a> to prism-<a> at maximum T of 515 °C. The complementary petrofabric and Raman study on graphite discloses a change from basal to prismatic <a> slip systems at maximum T of ca. 470 °C, accompanied by a strengthening of its structural order. The Raman study of large graphite grains revealed a non-random crystallinity organization in them, with domains of weaker lattice structural order (reflecting lower formation T) in core areas and higher crystallinity sectors (higher formation T) at the rims. This finding might reflect a shielding effect during prograde metamorphism, the rim material preventing grain core material from reorganization and increase in its crystallinity. This study shows also that graphite can be a good candidate for pressure-temperature-time path reconstruction in metamorphosed organic-rich rocks.
publishDate 2024
dc.date.none.fl_str_mv 2024
2024
2024
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/69671
url http://hdl.handle.net/10810/69671
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://www.sciencedirect.com/science/article/pii/S0191814124001883
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc/3.0/es/
Atribución-NoComercial 3.0 España
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc/3.0/es/
Atribución-NoComercial 3.0 España
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Addi. Archivo Digital para la Docencia y la Investigación
instname:Universidad del País Vasco
instname_str Universidad del País Vasco
reponame_str Addi. Archivo Digital para la Docencia y la Investigación
collection Addi. Archivo Digital para la Docencia y la Investigación
repository.name.fl_str_mv
repository.mail.fl_str_mv
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