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dc.contributor.author
Marquez Zavalia, Maria Florencia
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dc.contributor.author
Craig, James R.
dc.date.available
2023-07-07T19:16:20Z
dc.date.issued
2022-11
dc.identifier.citation
Marquez Zavalia, Maria Florencia; Craig, James R.; Stalactitic rhodochrosite from the 25 de Mayo and Nueve veins, Capillitas, Catamarca, Argentina: Physical and chemical variations; Czech Geological Survey; Journal of Geosciences; 67; 3; 11-2022; 209-227
dc.identifier.issn
1802-6222
dc.identifier.uri
http://hdl.handle.net/11336/202790
dc.description.abstract
Capillitas is an epithermal vein-type deposit in Argentina known for its mineralogical diversity, with more than one hundred and twenty described minerals, including five new species, and for the presence of banded and stalactitic rhodochrosite. Stalactites occur as single or combined cylinders of different sizes, from a few cm to 1.36 m in length and diameters up to 8 cm. Their cross-sections may show diverse aspects: from simple concentric banding to more intricate textures, whereas their external surface can be smooth, with undulations or with a poker-chip-like texture. The color of the stalactites varies from white to raspberry pink, with occasional brown bands toward the edges corresponding to a variety of rhodochrosite called “capillitite”. The contents of MnO range from 27.50 to 61.71 wt. % as it may be significantly replaced by CaO, FeO, ZnO and MgO. Replacements are reflected in the various shades of pink and brown displayed by this mineral. The different substitutions in the pink specimens exert only a minor influence on the unit cell parameters, whereas, in the brown variety, their size is significantly smaller with average values for pink rhodochrosite (n = 24): a 4.776 Å, c 15.690 Å and a cell volume of 310.3 Å3, whereas, “capillitite” unit-cell parameters (n = 7) are: a = 4.739, c = 15.558 with a unit-cell volume of 302.6 Å3. Conditions of formation of the banded rhodochrosite of the 25 de Mayo vein, obtained from fluid inclusions data, indicate temperatures of 145 ° to 150 °C and salinities of up to 4 wt. % NaCl(eq). The formation of the stalactites is explained by the infiltration of epithermal aqueous liquid, oversa-turated with Mn and bicarbonate, into a transiently vapor-filled, isolated cavity.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Czech Geological Survey
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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
ARGENTINA
dc.subject
CAPILLITAS
dc.subject
EPITHERMAL DEPOSIT
dc.subject
RHODOCHROSITE
dc.subject
STALACTITES
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
Stalactitic rhodochrosite from the 25 de Mayo and Nueve veins, Capillitas, Catamarca, Argentina: Physical and chemical variations
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2023-07-05T15:27:50Z
dc.identifier.eissn
1803-1943
dc.journal.volume
67
dc.journal.number
3
dc.journal.pagination
209-227
dc.journal.pais
República Checa
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dc.journal.ciudad
Praga
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: Craig, James R.. Virginia Tech University; Estados Unidos
dc.journal.title
Journal of Geosciences
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.jgeosci.org/detail/jgeosci.354
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.3190/jgeosci.354
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