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dc.contributor.author
Colombo, Fernando
dc.contributor.author
Sfragulla, Jorge Alberto
dc.contributor.author
González del Tánago, José
dc.date.available
2024-03-13T15:58:53Z
dc.date.issued
2012-12
dc.identifier.citation
Colombo, Fernando; Sfragulla, Jorge Alberto; González del Tánago, José; The garnet - phosphate buffer in peraluminous granitic magmas: A case study from pegmatites in the Pocho district, Córdoba, Argentina; Mineralogical Association of Canada; Canadian Mineralogist; 50; 6; 12-2012; 1555-1571
dc.identifier.issn
0008-4476
dc.identifier.uri
http://hdl.handle.net/11336/230429
dc.description.abstract
Members of the beusite–graftonite series [Mn/(Mn+Fe) between 0.47 and 0.65] appear associated to P-bearing garnet (up to 1.10 wt.% P2O5 in the crystal cores) in two primitive pegmatites of the Pocho district, Córdoba, central Argentina. Elemental maps and electron-microprobe analyses show that garnet has an irregular P distribution, with depleted rims. Textural features of garnet (resorbed margins, isolated relics in beusite, truncated zoning) and similar Mn/Fe values in garnet and beusite indicate that the phosphate formed by destabilization of garnet. The crystallization temperatures of the zones where garnet + beusite occur are 420°C (Tablada I) and 522°C (Cerro Moreno), and the P2O5 content in the melt of the middle intermediate zone at Tablada I is 0.82–0.91 wt.% (estimated using P in feldspars). One possible explanation involves the onset of garnet crystallization before the nucleation of beusite, while the P content of the magma was not buffered. As magmatic evolution progressed, P content increased and eventually reached levels high enough to stabilize mafic phosphates. For some time garnet co-crystallized with beusite; this is reflected by P-depleted zones in garnet. With P build-up, eventually mafic silicates became unstable and were replaced by phosphates. The low activities of F, Li and Na contributed to stabilize beusite. The modest degree of evolution of the pegmatites is indicated by very high Mg content of the phosphates. Beusite has primary inclusions of Mg-rich phosphates, one belonging to the alluaudite group and the other one possibly belonging to the triplite or wolfeite groups. Breakdown of beusite under oxidizing hydrothermal conditions produced, among others, mitridatite and jahnsite-(CaMnMg).
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Association of Canada
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Beusite–graftonite
dc.subject
Phosphorus
dc.subject
Garnet
dc.subject
Alluaudite group
dc.subject.classification
Mineralogía
dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
The garnet - phosphate buffer in peraluminous granitic magmas: A case study from pegmatites in the Pocho district, Córdoba, 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
2024-03-05T13:19:48Z
dc.identifier.eissn
1499-1276
dc.journal.volume
50
dc.journal.number
6
dc.journal.pagination
1555-1571
dc.journal.pais
Canadá
dc.journal.ciudad
Toronto
dc.description.fil
Fil: Colombo, Fernando. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; 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: Sfragulla, Jorge Alberto. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas, Físicas y Naturales; Argentina
dc.description.fil
Fil: González del Tánago, José. Universidad Complutense de Madrid; España
dc.journal.title
Canadian Mineralogist
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://pubs.geoscienceworld.org/canmin/article/50/6/1555/127488/THE-GARNET-PHOSPHATE-BUFFER-IN-PERALUMINOUS
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3749/canmin.50.6.1555
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