Génesis del yacimiento de magnesita de Rubián (Lugo): nueva interpretación basada en datos petrológicos y geoquímicos

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dc.contributor.authorPozo, M.
dc.contributor.authorCalvo Sorando, José Pedro
dc.contributor.authorBustillo Revuelta, Manuel
dc.contributor.authorKilias, Stephanos P.
dc.contributor.authorStamatakis, Michael G.
dc.date.accessioned2023-06-20T12:46:46Z
dc.date.available2023-06-20T12:46:46Z
dc.date.issued2004
dc.description.abstractThe Rubian sparry magnesite (Galicia, NW Spain) is hosted in Lower Cambrian carbonate rocks (Caliza de Cándana Fm.) included in a strongly deformed and faulted thick succession of siliciclastic and carbonate rocks. The magnesite shows massive and banded fabrics. δ18 O SMOW values range from 13,32‰ to 17,22‰ whilst δ13C PDB values range from -2,32‰ to 2,37‰. Radiogenic strontium isotopes from magnesite exceed 0.711435, considerably higher than those commonly reported for Cambrian marine carbonates. Similarly, REE patterns do not show any sort of anomaly indicative of marine environment. Fluid inclusions can be interpreted as a result of NaCI-CaCI2(±MgCI2) mineralising brines, probably by mixing of two CaCI2 -rich fluids of contrasted salinity, and allow to conclude that magnesite formed at a minimum temperature of 170±15QC. Accordingly, a hydrothermal/metasomatic replacement of preexisting dolostone is proposed as a more reliable process to explain the origin of the sparry magnesite of Rubian, which is in contrast with previous interpretations that supported a syn-diagenetic model for the formation of the deposit.
dc.description.departmentDepto. de Mineralogía y Petrología
dc.description.facultyFac. de Ciencias Geológicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia y Tecnología (MCYT)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/60659
dc.identifier.issn1576-5172
dc.identifier.officialurlhttp://www.sociedadgeologica.es/publicaciones_geotemas_realizadas.html
dc.identifier.urihttps://hdl.handle.net/20.500.14352/52498
dc.issue.number1
dc.journal.titleGeotemas
dc.language.isospa
dc.page.final232
dc.page.initial229
dc.publisherSociedad Geológica de España.
dc.relation.projectIDBTE2001-1443
dc.rights.accessRightsopen access
dc.subject.cdu550.4
dc.subject.cdu552.5
dc.subject.keywordMineral deposits
dc.subject.keywordMagnesite
dc.subject.keywordGeochemistry
dc.subject.keywordPaleozoic
dc.subject.keywordGalicia
dc.subject.ucmGeoquímica
dc.subject.ucmPetrología
dc.subject.unesco2503 Geoquímica
dc.titleGénesis del yacimiento de magnesita de Rubián (Lugo): nueva interpretación basada en datos petrológicos y geoquímicos
dc.typejournal article
dc.volume.number6
dspace.entity.typePublication
relation.isAuthorOfPublication4aa3824b-ca03-45fd-b468-ebd78cb1ac8f
relation.isAuthorOfPublication1df6fcdd-8f4e-485a-a759-2f9e008d9db8
relation.isAuthorOfPublication.latestForDiscovery4aa3824b-ca03-45fd-b468-ebd78cb1ac8f
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