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dc.contributor.author
Galliski, Miguel Angel
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dc.contributor.author
Marquez Zavalia, Maria Florencia
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dc.contributor.author
Lira, Raul
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dc.contributor.author
Cempírek, Jan
dc.contributor.author
Skoda, Radek
dc.date.available
2024-03-22T10:40:29Z
dc.date.issued
2012-09
dc.identifier.citation
Galliski, Miguel Angel; Marquez Zavalia, Maria Florencia; Lira, Raul; Cempírek, Jan; Skoda, Radek; Mineralogy and origin of the dumortierite-bearing pegmatites of Virorco, San Luis, Argentina; Mineralogical Association of Canada; Canadian Mineralogist; 50; 4; 9-2012; 873-894
dc.identifier.issn
0008-4476
dc.identifier.uri
http://hdl.handle.net/11336/231255
dc.description.abstract
The Virorco dumortierite-bearing pegmatite dikes, in Sierra de San Luis, Eastern Pampean Ranges of central Argentina, are a group of thin, steeply dipping dikes 2 to 10 cm thick with variable lengths (a few dm to <2 m). The pegmatites are emplaced in partially uralitized norite and gabbro that belong to a larger mafic?ultramafic intrusive belt. The pegmatite dikes are symmetrically zoned, with quartz, albite, oligoclase, tourmaline-supergroup and dumortierite-group minerals, muscovite and kyanite as the major phases; the accessory and trace minerals include beryl, chrysoberyl, garnet, fluorapatite, columbite-(Mn) to tantalite-(Mn), pollucite, gahnite, zircon, uraninite and thorite. Holmquistite was found in the exocontact asemblage. Primary textures of magmatic origin were partially disrupted by partial replacements by later minerals and incipient to strong deformation. The whole-rock chemical composition of the dikes shows SiO2 contents normal for rare-element pegmatites whereas amounts of Al2O3 and B2O3 are very high. The composition features high MgO, FeO, CaO and P2O5 and, for pegmatites, unusually low Na2O and K2O contents. Amounts of trace elements are remarkably high in case of Cs (4.3?94.1 ppm), Ta (130?500) and Be (137?261). The normalized REE contents are low (0.1 to 30 times chondrite), highlighted by a strong negative Eu anomaly. Five textural and compositional types of tourmaline-supergroup minerals were identified in the different pegmatitic zones, ranging from dravite-rich compositions to rossmannite, passing through schorl and Mn-rich elbaite. At least four generations of the dumortierite?holtite minerals are texturally and compositionally represented in these dikes: the earliest dumortierite replaces muscovite and tourmaline, locally together with a second generation that grades into As-poor holtite. The third generation is represented by overgrowths or individual crystals of As-poor and As-rich holtite; it is commonly overgrown by the last generation of dumortierite enriched in As. The chemical evolution of dumortierite-group minerals is characterized by an increase of Ta, Nb and minor As, followed by an extensive enrichment in As(+ Sb + Bi) along with gradual decrease in Ta + Nb. The different mineral assemblages and particularly the compositional trends of tourmaline, dumortierite?holtite and columbite reflect superimposed processes. The initial stage comprises the magmatic crystallization of a highly evolved and boron-rich peraluminous melt. The second stage was a prograde medium-pressure metamorphism, with a fluid-phase-related episode of crystallization. The most likely source of the initial melt is an extraction of residual melt from an almost completely crystallized rare-element parental pegmatite.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Association of Canada
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
DUMORTIERITE-HOLTITE
dc.subject
VIRORCO-SAN LUIS
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ABYSSAL PEGMATITES
dc.subject
CHRYSOBERYL
dc.subject.classification
Mineralogía
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Mineralogy and origin of the dumortierite-bearing pegmatites of Virorco, San Luis, 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
2024-03-05T13:19:38Z
dc.identifier.eissn
1499-1276
dc.journal.volume
50
dc.journal.number
4
dc.journal.pagination
873-894
dc.journal.pais
Canadá
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dc.journal.ciudad
Toronto
dc.description.fil
Fil: Galliski, Miguel Angel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
dc.description.fil
Fil: Marquez Zavalia, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; Argentina
dc.description.fil
Fil: Lira, Raul. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Museo de Mineralogía y Geología "Dr. A. Stelzner"; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones en Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Centro de Investigaciones en Ciencias de la Tierra; Argentina
dc.description.fil
Fil: Cempírek, Jan. Masaryk University. Faculty Of Sciences; República Checa
dc.description.fil
Fil: Skoda, Radek. Masaryk University. Faculty Of Sciences; República Checa
dc.journal.title
Canadian Mineralogist
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.3749/canmin.50.4.873
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/canmin/article/50/4/873/127388
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