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dc.contributor.author
Gargiulo, Maria Florencia
dc.contributor.author
Bjerg, Ernesto Alfredo
dc.contributor.author
Mogessie, A.
dc.date.available
2016-07-22T14:04:59Z
dc.date.issued
2013-06
dc.identifier.citation
Gargiulo, Maria Florencia; Bjerg, Ernesto Alfredo; Mogessie, A.; Spinel group minerals in metamorphosed ultramafic rocks from Río de Las Tunas Belt, Central Andes, Argentina; Universidad de Barcelona; Geologica Acta; 11; 2; 6-2013; 133-148
dc.identifier.issn
1695-6133
dc.identifier.uri
http://hdl.handle.net/11336/6631
dc.description.abstract
In the Río de Las Tunas belt, Central Andes of Argentina, spinel group minerals occur in metaperidotites and in reaction zones developed at the boundary between metaperidotite bodies and their country-rocks. They comprise two types: i) Reddish-brown crystals with compositional zonation characterized by a ferritchromite core surrounded by an inner rim of Cr-magnetite and an outer rim of almost pure magnetite. ii) Green crystals chemically homogeneous with spinel (s.s.) and/or pleonaste compositions. The mineral paragenesis Fo+Srp+Cln+Tr+Fe-Chr and Fo+Cln+Tr+Tlc±Ath+Fe-Chr observed in the samples indicate lower and middle grade amphibolite facies metamorphic conditions. Nonetheless, the paragenesis (green)Spl+En+Fo±Di indicates that granulite facies conditions were also reached at a few localities. Cr-magnetite and magnetite rims in zoned reddish-brown crystals and magnetite rims around green-spinel/pleonaste grains are attributed to a later serpentinization process during retrograde metamorphism. The chemical composition of spinel group minerals in the ultramafic reaction zones is determined by the mineral zone where they crystallize. Green pleonaste occurs in the chlorite zone, ferritchromite predominates in the amphibole zone, whereas Cr-magnetite and magnetite are more common in the carbonate zone. The mineral paragenesis of the Río de Las Tunas metaperidotites together with the chemical characteristics of the spinel group minerals support a clockwise P-T path evolution for the ultramafic protoliths during the Paleozoic regional metamorphic cycle of this area.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Universidad de Barcelona
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Spinel Group Minerals
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Metaperidotites
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Alpine Type Belts
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Central Andes
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Mineralogía
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Spinel group minerals in metamorphosed ultramafic rocks from Río de Las Tunas Belt, Central Andes, 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
2016-07-12T15:19:42Z
dc.journal.volume
11
dc.journal.number
2
dc.journal.pagination
133-148
dc.journal.pais
España
dc.journal.ciudad
Barcelona
dc.description.fil
Fil: Gargiulo, Maria Florencia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina. Universidad Nacional del Sur; Argentina
dc.description.fil
Fil: Bjerg, Ernesto Alfredo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Geológico del Sur; Argentina. Universidad Nacional del Sur; Argentina
dc.description.fil
Fil: Mogessie, A.. Karl-Franzens Universität Graz; Austria
dc.journal.title
Geologica Acta
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1344/105.000001836
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/ark/10.1344/105.000001836
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://revistes.ub.edu/index.php/GEOACTA/article/view/105.000001836
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.raco.cat/index.php/GeologicaActa/article/view/265919
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