Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)

Abstract The aim of this study is to establish the petrogenetic links between the different granitic and aplopegmatitic units occurring in the Tres Arroyos granite-aplopegmatite system (Central Iberian Zone, Spain), from the textural and chemical variations in micas and feldspars. We aim to understa...

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Autores: Garate Olave, Idoia, Roda Robles, María Encarnación, Gil Crespo, Pedro Pablo, Pesquera Pérez, Alfonso
Tipo de recurso: artículo
Fecha de publicación:2018
País:España
Institución:Universidad del País Vasco
Repositorio:Addi. Archivo Digital para la Docencia y la Investigación
OAI Identifier:oai:addi.ehu.eus:10810/75547
Acceso en línea:http://hdl.handle.net/10810/75547
Access Level:acceso abierto
Palabra clave:micas
feldspars
aplopegmatites
granites
Tres Arroyos
Central Iberian Zone
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spelling Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)Garate Olave, IdoiaRoda Robles, María EncarnaciónGil Crespo, Pedro PabloPesquera Pérez, AlfonsomicasfeldsparsaplopegmatitesgranitesTres ArroyosCentral Iberian ZoneAbstract The aim of this study is to establish the petrogenetic links between the different granitic and aplopegmatitic units occurring in the Tres Arroyos granite-aplopegmatite system (Central Iberian Zone, Spain), from the textural and chemical variations in micas and feldspars. We aim to understand the differentiation mechanisms that allowed the extreme fractionation levels observed in the Li–F-richest dykes occurring in this aplopegmatite field. Major and trace elements in micas and feldspar from the different facies were analyzed by electron microprobe and LA-ICP-MS. Mica compositions define three different trends: muscovite-zinnwalditepolylithionite, muscovite-trilithionite-polylithionite and biotite-zinnwaldite. The substitution mechanisms depend on the type of trend and on the stage of evolution. The K/Rb ratio and the Ba contents decrease in micas and K-feldspar with fractionation, whereas Li, Rb and Cs values increase. Lithium, Rb, Cs, Ba, Nb, and Ta show a clear tendency to get into the structure of the Fe-rich mica, whereas Be partitions preferably into the Al-micas. When Fe-micas are absent, Al-rich micas become the major sink for those trace elements. Phosphorus and Pb preferably get into the feldspars. In general, a linear and continuous variation of the K/Rb ratio with incompatible elements such as Cs, Rb or Li, and compatible such as Ba, both in micas and K-feldspar, supports a petrogenetic link between the Alburquerque batholith and the aplopegmatites via fractional crystallization.This research has been supported financially by the Spanish Ministerio de Economía y Competitividad (Project CGL2012-31356 through ERDF funds). The University of the Basque Country (UPV/EHU) contributed economically through the grant GIU/1216 and GIU/1501. Idoia Garate-Olave has been financed by Gobierno Vasco/Eusko Jaurlaritza.Springer202520252018info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10810/75547reponame:Addi. Archivo Digital para la Docencia y la Investigacióninstname:Universidad del País VascoIngléshttps://doi.org/10.1007/s41513-018-0077-zinfo:eu-repo/semantics/openAccess© 2018, Springer Nature Switzerland AGoai:addi.ehu.eus:10810/755472026-06-18T09:23:17Z
dc.title.none.fl_str_mv Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
title Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
spellingShingle Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
Garate Olave, Idoia
micas
feldspars
aplopegmatites
granites
Tres Arroyos
Central Iberian Zone
title_short Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
title_full Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
title_fullStr Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
title_full_unstemmed Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
title_sort Mica and feldspar as indicators of the evolution of a highly evolved granite‑pegmatite system in the Tres Arroyos area (Central Iberian Zone, Spain)
dc.creator.none.fl_str_mv Garate Olave, Idoia
Roda Robles, María Encarnación
Gil Crespo, Pedro Pablo
Pesquera Pérez, Alfonso
author Garate Olave, Idoia
author_facet Garate Olave, Idoia
Roda Robles, María Encarnación
Gil Crespo, Pedro Pablo
Pesquera Pérez, Alfonso
author_role author
author2 Roda Robles, María Encarnación
Gil Crespo, Pedro Pablo
Pesquera Pérez, Alfonso
author2_role author
author
author
dc.subject.none.fl_str_mv micas
feldspars
aplopegmatites
granites
Tres Arroyos
Central Iberian Zone
topic micas
feldspars
aplopegmatites
granites
Tres Arroyos
Central Iberian Zone
description Abstract The aim of this study is to establish the petrogenetic links between the different granitic and aplopegmatitic units occurring in the Tres Arroyos granite-aplopegmatite system (Central Iberian Zone, Spain), from the textural and chemical variations in micas and feldspars. We aim to understand the differentiation mechanisms that allowed the extreme fractionation levels observed in the Li–F-richest dykes occurring in this aplopegmatite field. Major and trace elements in micas and feldspar from the different facies were analyzed by electron microprobe and LA-ICP-MS. Mica compositions define three different trends: muscovite-zinnwalditepolylithionite, muscovite-trilithionite-polylithionite and biotite-zinnwaldite. The substitution mechanisms depend on the type of trend and on the stage of evolution. The K/Rb ratio and the Ba contents decrease in micas and K-feldspar with fractionation, whereas Li, Rb and Cs values increase. Lithium, Rb, Cs, Ba, Nb, and Ta show a clear tendency to get into the structure of the Fe-rich mica, whereas Be partitions preferably into the Al-micas. When Fe-micas are absent, Al-rich micas become the major sink for those trace elements. Phosphorus and Pb preferably get into the feldspars. In general, a linear and continuous variation of the K/Rb ratio with incompatible elements such as Cs, Rb or Li, and compatible such as Ba, both in micas and K-feldspar, supports a petrogenetic link between the Alburquerque batholith and the aplopegmatites via fractional crystallization.
publishDate 2018
dc.date.none.fl_str_mv 2018
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10810/75547
url http://hdl.handle.net/10810/75547
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1007/s41513-018-0077-z
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
© 2018, Springer Nature Switzerland AG
eu_rights_str_mv openAccess
rights_invalid_str_mv © 2018, Springer Nature Switzerland AG
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
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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