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dc.contributor.author
Gallard Esquivel, Maria Cecilia
dc.contributor.author
Cepedal, A.
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Fuertes Fuente, Maria Mercedes
dc.contributor.author
Martin Izard, A.
dc.date.available
2019-12-30T16:41:01Z
dc.date.issued
2018-05
dc.identifier.citation
Gallard Esquivel, Maria Cecilia; Cepedal, A.; Fuertes Fuente, Maria Mercedes; Martin Izard, A.; Enrichment in critical metals (In-Ge) and Te-Se in epithermal deposits of the 'La Carolina' district, San Luis, Argentina; Mineralogical Society; Mineralogical Magazine; 82; S1; 5-2018; S61-S87
dc.identifier.issn
0026-461X
dc.identifier.uri
http://hdl.handle.net/11336/93264
dc.description.abstract
Epithermal Au-Ag deposits of the La Carolina district, in the San Luis metallogenetic belt (Argentina), are related spatially and genetically to Mio-Pliocene volcanism. In this district, mineralization in the Cerro Mogote and Puesto La Estancia prospects occur as disseminations, veins and fracture/cavity infillings in volcanic/pyroclastic rocks, metamorphic basement and hydrothermal breccias. The gangue assemblage is dominated by carbonates (siderite, rhodochrosite, kutnahorite, dolomite). The main sulfides are pyrite, sphalerite, galena and chalcopyrite. Pyrite and sphalerite have compositional zoning, the former with As-rich cores and Cu-rich overgrowths, the latter with Fe-rich and Fe-poor bands. Sphalerite shows variable contents of Mn, Cu, In, Ga, Ge and Ag. The In-richest sphalerite hosts up to 5940 ppm In but also contains elevated concentrations of Cu, Ag, Ga and Ge, suggesting a coupled substitution mechanism resulting in enrichments in monovalent (Ag+, Cu+) and trivalent-tetravalent cations (Ga3+, In3+, Ge4+). The main precious metal minerals are Ag-rich tetrahedrite, acanthite, argyrodite, pearceite-polybasite and Au-Ag alloy. Locally, Se and/or Te-enriched minerals include galena Pb(S0.9-1Se0.1-0), hessite Ag2(Te0.9-1Se0.1-0), Se-rich cervelleite Ag4(Te1.3-0.9S1-0.5 Se0.5-0.2), and also alburnite [Ag8GeTe2S4] and benleonardite [Ag15Cu(As,Sb)2S7Te4]. Pearceite contains Te (3.6-4.3 wt.%) and Se (1-2.3 wt.%) substituting for S, which are unusually high concentrations for this mineral. The Puesto La Estancia deposit contains various tellurides including sylvanite, petzite, stutzite, altaite, tellurobismuthite and volynskite. This study shows that the chemistry of the fluids fluctuated during ore deposition suggesting different fluid pulses (system rejuvenation and/or boiling). The enrichment in Te, Se and Bi enrichment is supportive of a magmatic contribution to the ore fluid, while graphite in the metamorphic basement could be the source of germanium, although a magmatic source cannot be ruled out.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Mineralogical Society
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ALBURNITE
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ARGYRODITE
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IN-BEARING SPHALERITE
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PEARCEITE-POLYBASITE GROUP
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SAN LUIS METALLOGENIC BELT
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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
Enrichment in critical metals (In-Ge) and Te-Se in epithermal deposits of the 'La Carolina' district, 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
2019-10-23T21:38:55Z
dc.journal.volume
82
dc.journal.number
S1
dc.journal.pagination
S61-S87
dc.journal.pais
Reino Unido
dc.description.fil
Fil: Gallard Esquivel, Maria Cecilia. Universidad Nacional de San Luis. Facultad de Ciencias Físico Matemáticas y Naturales. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Cepedal, A.. Universidad de Oviedo; España
dc.description.fil
Fil: Fuertes Fuente, Maria Mercedes. Universidad de Oviedo; España
dc.description.fil
Fil: Martin Izard, A.. Universidad de Oviedo; España
dc.journal.title
Mineralogical Magazine
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1180/minmag.2017.081.105
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.cambridge.org/core/journals/mineralogical-magazine/article/enrichment-in-critical-metals-inge-and-tese-in-epithermal-deposits-of-the-la-carolina-district-san-luis-argentina/4DDF8BACF22CE81BC62482309D4C7B37
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