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dc.contributor.author
Lorenz, Melanie
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Altenberger, Uwe
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Trumbull, Robert
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Lira, Raúl
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Lopez, Monica Graciela
dc.contributor.author
Günter, Christina
dc.date.available
2021-11-25T06:25:15Z
dc.date.issued
2019-12
dc.identifier.citation
Lorenz, Melanie; Altenberger, Uwe; Trumbull, Robert; Lira, Raúl; Lopez, Monica Graciela; et al.; Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina; Mineralogical Society of America; American Mineralogist; 104; 12; 12-2019; 1840-1850
dc.identifier.issn
0003-004X
dc.identifier.uri
http://hdl.handle.net/11336/147381
dc.description.abstract
Britholite group minerals (REE,Ca)5[(Si,P)O4]3(OH,F) are rather widespread rare-earth minerals in alkaline rocks and their associated metasomatic zones, where they usually form tiny accessory phases. In the REE deposit Rodeo de los Molles (RdM), Central Argentina, fluorbritholite-Ce (FBri) is the main carrier of REE and closely intergrown with fluorapatite (FAp). These minerals reach an exceptional abundance of locally up to 75 modal % (FBri) and 5 modal % (FAp) in veins. The RdM deposit is hosted by fenitized monzogranite of the Middle Devonian Las Chacras-Potrerillos batholith. The REE mineralization consists of fluorbritholite-(Ce), fluorapatite, allanite-(Ce) and REE carbonates (bastnaesite), and is associated with hydrothermal fluorite, quartz, albite, zircon and titanite. The REE mineralization takes two forms: irregular patches and discrete cross-cutting veins. The patches are more common, but here fluorbritholite-(Ce) is mostly replaced by REE carbonates. The REE mineralization in veins has more abundant britholite phases and less replacement textures. The majority of britholite grains at RdM 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 RdM reveals the dominant coupled substitution of REE3+ + Si4+ = Ca2+ + P5+ for the formation of fluorapatite and fluorbritholite-(Ce) and a compositional gap of ~4 apfu between the two phases. The latter is interpreted as a miscibility gap between the two phases. Exsolution textures of apatite in britholite and vice versa are presented for the first time and interpreted to have formed in order to maintain equilibrium at P-T conditions of the possible solvus.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Society of America
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
BRITHOLITE, APATITE
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EXSOLUTION TEXTURES
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REE MINERALIZATION-FENITE
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RODEO DE LOS MOLLES
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Mineralogía
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Chemical and textural relations of britholite- and apatite-group minerals from hydrothermal REE mineralization at the Rodeo de los Molles deposit, Central Argentina
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2020-11-20T18:07:23Z
dc.journal.volume
104
dc.journal.number
12
dc.journal.pagination
1840-1850
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Chantilly
dc.description.fil
Fil: Lorenz, Melanie. Universitat Potsdam. Mathematisch Nautrwissenschaften Fakultat; Alemania
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Fil: Altenberger, Uwe. Universitat Potsdam. Mathematisch Nautrwissenschaften Fakultat; Alemania
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Fil: Trumbull, Robert. German Research Centre for Geosciences; Alemania
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Fil: Lira, Raúl. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina
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Fil: Lopez, Monica Graciela. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotópica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotópica; Argentina
dc.description.fil
Fil: Günter, Christina. Universitat Potsdam. Mathematisch Nautrwissenschaften Fakultat; Alemania
dc.journal.title
American Mineralogist
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.minsocam.org/MSA/Ammin/AM_Preprints/6969LorenzPreprintDec.pdf
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.2138/am-2019-6969