Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina

Autores
Lorenz, Melanie; Altenberger, Uwe; Trumbull, Robert B.; Lira, Raúl; López de Luchi, Mónica; Günter, Christina; Eidner, Sascha
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Fil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.
Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.
Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.
Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.
Britholite group minerals (REE,Ca)5[(Si,P)O4]3(OH,F) are widespread rare-earth minerals in alkaline rocks and their associated metasomatic zones, where they usually are minor accessory phases. An exception is the REE deposit Rodeo de los Molles, Central Argentina, where fluorbritholite-(Ce) (FBri) is the main carrier of REE and is closely intergrown with fluorapatite (FAp). These minerals reach an abundance of locally up to 75 modal% (FBri) and 20 modal% (FAp) in the vein mineralizations. The Rodeo de los Molles deposit is hosted by a fenitized monzogranite of the Middle Devonian Las Chacras-Potrerillos batholith. The REE mineralization consists of fluorbritholite-(Ce), britholite-(Ce), fluorapatite, allanite-(Ce), and REE fluorcarbonates, and is associated with hydrothermal fluorite, quartz, albite, zircon, and titanite. The REE assemblage takes two forms: irregular patchy shaped REE-rich composites and discrete cross-cutting veins. The irregular composites are more common, but here fluorbritholite-(Ce) is mostly replaced by REE carbonates. The vein mineralization has more abundant and better-preserved britholite phases. The majority of britholite grains at Rodeo de los Molles are hydrothermally altered, and alteration is strongly enhanced by metamictization, which is indicated by darkening of the mineral, loss of birefringence, porosity, and volume changes leading to polygonal cracks in and around altered grains. A detailed electron microprobe study of apatite-britholite minerals from Rodeo de los Molles revealed compositional variations in fluorapatite and fluorbritholite-(Ce) consistent with the coupled substitution of REE3+ + Si4+ = Ca2+ + P5+ and a compositional gap of ~4 apfu between the two phases, which we interpret as a miscibility gap. Micrometer-scale intergrowths of fluorapatite in fluorbritholite-(Ce) minerals and vice versa are chemically characterized here for the first time and interpreted as exsolution textures that formed during cooling below the proposed solvus
publishedVersion
Fil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.
Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.
Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.
Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.
Mineralogía
Materia
Exsolution textures
Miscibility gap
Compositional gap
Fenite
Alkaline granites
Hydrothermal alteration
NATURAL SCIENCES::Earth sciences
Nivel de accesibilidad
acceso abierto
Condiciones de uso
Repositorio
Repositorio Digital Universitario (UNC)
Institución
Universidad Nacional de Córdoba
OAI Identificador
oai:rdu.unc.edu.ar:11086/562608
Acceder
id RDUUNC_be03f736e935f77bd95e51ec47b77f76
oai_identifier_str oai:rdu.unc.edu.ar:11086/562608
network_acronym_str RDUUNC
repository_id_str 2572
network_name_str Repositorio Digital Universitario (UNC)
spelling Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central ArgentinaLorenz, MelanieAltenberger, UweTrumbull, Robert B.Lira, RaúlLópez de Luchi, MónicaGünter, ChristinaEidner, SaschaExsolution texturesMiscibility gapCompositional gapFeniteAlkaline granitesHydrothermal alterationNATURAL SCIENCES::Earth sciencesFil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.Britholite group minerals (REE,Ca)5[(Si,P)O4]3(OH,F) are widespread rare-earth minerals in alkaline rocks and their associated metasomatic zones, where they usually are minor accessory phases. An exception is the REE deposit Rodeo de los Molles, Central Argentina, where fluorbritholite-(Ce) (FBri) is the main carrier of REE and is closely intergrown with fluorapatite (FAp). These minerals reach an abundance of locally up to 75 modal% (FBri) and 20 modal% (FAp) in the vein mineralizations. The Rodeo de los Molles deposit is hosted by a fenitized monzogranite of the Middle Devonian Las Chacras-Potrerillos batholith. The REE mineralization consists of fluorbritholite-(Ce), britholite-(Ce), fluorapatite, allanite-(Ce), and REE fluorcarbonates, and is associated with hydrothermal fluorite, quartz, albite, zircon, and titanite. The REE assemblage takes two forms: irregular patchy shaped REE-rich composites and discrete cross-cutting veins. The irregular composites are more common, but here fluorbritholite-(Ce) is mostly replaced by REE carbonates. The vein mineralization has more abundant and better-preserved britholite phases. The majority of britholite grains at Rodeo de los Molles are hydrothermally altered, and alteration is strongly enhanced by metamictization, which is indicated by darkening of the mineral, loss of birefringence, porosity, and volume changes leading to polygonal cracks in and around altered grains. A detailed electron microprobe study of apatite-britholite minerals from Rodeo de los Molles revealed compositional variations in fluorapatite and fluorbritholite-(Ce) consistent with the coupled substitution of REE3+ + Si4+ = Ca2+ + P5+ and a compositional gap of ~4 apfu between the two phases, which we interpret as a miscibility gap. Micrometer-scale intergrowths of fluorapatite in fluorbritholite-(Ce) minerals and vice versa are chemically characterized here for the first time and interpreted as exsolution textures that formed during cooling below the proposed solvuspublishedVersionFil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.Mineralogía2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf0003-004Xhttp://hdl.handle.net/11086/562608enginfo:eu-repo/semantics/openAccessreponame:Repositorio Digital Universitario (UNC)instname:Universidad Nacional de Córdobainstacron:UNC2026-09-24T11:34:12Zoai:rdu.unc.edu.ar:11086/562608Institucionalhttps://rdu.unc.edu.ar/Universidad públicaNo correspondehttp://rdu.unc.edu.ar/oai/snrdoca.unc@gmail.comArgentinaNo correspondeNo correspondeNo correspondeopendoar:25722026-09-24 11:34:12.823Repositorio Digital Universitario (UNC) - Universidad Nacional de Córdobafalse
dc.title.none.fl_str_mv Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
title Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
spellingShingle Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
Lorenz, Melanie
Exsolution textures
Miscibility gap
Compositional gap
Fenite
Alkaline granites
Hydrothermal alteration
NATURAL SCIENCES::Earth sciences
title_short Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
title_full Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
title_fullStr Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
title_full_unstemmed Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
title_sort Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
dc.creator.none.fl_str_mv Lorenz, Melanie
Altenberger, Uwe
Trumbull, Robert B.
Lira, Raúl
López de Luchi, Mónica
Günter, Christina
Eidner, Sascha
author Lorenz, Melanie
author_facet Lorenz, Melanie
Altenberger, Uwe
Trumbull, Robert B.
Lira, Raúl
López de Luchi, Mónica
Günter, Christina
Eidner, Sascha
author_role author
author2 Altenberger, Uwe
Trumbull, Robert B.
Lira, Raúl
López de Luchi, Mónica
Günter, Christina
Eidner, Sascha
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Exsolution textures
Miscibility gap
Compositional gap
Fenite
Alkaline granites
Hydrothermal alteration
NATURAL SCIENCES::Earth sciences
topic Exsolution textures
Miscibility gap
Compositional gap
Fenite
Alkaline granites
Hydrothermal alteration
NATURAL SCIENCES::Earth sciences
dc.description.none.fl_txt_mv Fil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.
Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.
Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.
Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.
Britholite group minerals (REE,Ca)5[(Si,P)O4]3(OH,F) are widespread rare-earth minerals in alkaline rocks and their associated metasomatic zones, where they usually are minor accessory phases. An exception is the REE deposit Rodeo de los Molles, Central Argentina, where fluorbritholite-(Ce) (FBri) is the main carrier of REE and is closely intergrown with fluorapatite (FAp). These minerals reach an abundance of locally up to 75 modal% (FBri) and 20 modal% (FAp) in the vein mineralizations. The Rodeo de los Molles deposit is hosted by a fenitized monzogranite of the Middle Devonian Las Chacras-Potrerillos batholith. The REE mineralization consists of fluorbritholite-(Ce), britholite-(Ce), fluorapatite, allanite-(Ce), and REE fluorcarbonates, and is associated with hydrothermal fluorite, quartz, albite, zircon, and titanite. The REE assemblage takes two forms: irregular patchy shaped REE-rich composites and discrete cross-cutting veins. The irregular composites are more common, but here fluorbritholite-(Ce) is mostly replaced by REE carbonates. The vein mineralization has more abundant and better-preserved britholite phases. The majority of britholite grains at Rodeo de los Molles are hydrothermally altered, and alteration is strongly enhanced by metamictization, which is indicated by darkening of the mineral, loss of birefringence, porosity, and volume changes leading to polygonal cracks in and around altered grains. A detailed electron microprobe study of apatite-britholite minerals from Rodeo de los Molles revealed compositional variations in fluorapatite and fluorbritholite-(Ce) consistent with the coupled substitution of REE3+ + Si4+ = Ca2+ + P5+ and a compositional gap of ~4 apfu between the two phases, which we interpret as a miscibility gap. Micrometer-scale intergrowths of fluorapatite in fluorbritholite-(Ce) minerals and vice versa are chemically characterized here for the first time and interpreted as exsolution textures that formed during cooling below the proposed solvus
publishedVersion
Fil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Altenberger, Uwe. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Trumbull, Robert B. Centro Alemán de Investigación de Geociencias GFZ; Alemania.
Fil: Lira, Raúl. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina.
Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales. Museo de Mineralogía y Geología “Drive A. Stelzner”; Argentina.
Fil: López de Luchi, Mónica. Consejo Nacional de Investigaciones Científicas y Técnicas. IGNEIS, Instituto de Geocronología y Geología Isotópica; Argentina.
Fil: Günter, Christina. Instituto de Geociencias, Universidad de Potsdam; Alemania.
Fil: Eidner, Sascha. Instituto de Química (Química Física), Universidad de Potsdam; Alemania.
Mineralogía
description Fil: Lorenz, Melanie. Instituto de Geociencias, Universidad de Potsdam; Alemania.
publishDate 2019
dc.date.none.fl_str_mv 2019
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 0003-004X
http://hdl.handle.net/11086/562608
identifier_str_mv 0003-004X
url http://hdl.handle.net/11086/562608
dc.language.none.fl_str_mv eng
language eng
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Repositorio Digital Universitario (UNC)
instname:Universidad Nacional de Córdoba
instacron:UNC
reponame_str Repositorio Digital Universitario (UNC)
collection Repositorio Digital Universitario (UNC)
instname_str Universidad Nacional de Córdoba
instacron_str UNC
institution UNC
repository.name.fl_str_mv Repositorio Digital Universitario (UNC) - Universidad Nacional de Córdoba
repository.mail.fl_str_mv oca.unc@gmail.com
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