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dc.contributor.author
Verdecchia, Sebastián Osvaldo
dc.contributor.author
Reche, J.
dc.contributor.author
Baldo, Edgardo Gaspar Agustín
dc.contributor.author
Segovia Díaz, E.
dc.contributor.author
Martínez, F. J.
dc.date.available
2017-09-22T19:18:44Z
dc.date.issued
2012-10
dc.identifier.citation
Verdecchia, Sebastián Osvaldo; Reche, J.; Baldo, Edgardo Gaspar Agustín; Segovia Díaz, E.; Martínez, F. J.; Staurolite porphyroblast controls on local bulk compositional and microstructural changes during decompression of a St–Bt–Grt–Crd–And schist (Ancasti metamorphic complex, Sierras Pampeanas, W Argentina); Wiley; Journal Of Metamorphic Geology; 31; 2; 10-2012; 131-146
dc.identifier.issn
0263-4929
dc.identifier.uri
http://hdl.handle.net/11336/24992
dc.description.abstract
The staurolite–biotite–garnet–cordierite–andalusite–plagioclase–muscovite–quartz metapelitic mineral assemblage has been frequently interpreted in the literature as a result of superimposition of various metamorphic events, for example, in polymetamorphic sequences. The assemblage was identified in schists from the Ancasti metamorphic complex (Sierras Pampeanas of Argentina) where previous authors have favoured the polymetamorphic genetic interpretation. A pseudosection in the MnNCKFMASH system for the analysed XRF bulk composition predicts the stability of the sub-assemblage staurolite–biotite–garnet–plagioclase–muscovite–quartz, and the compositional isopleths also agree with measured mineral compositions. Nevertheless, the XRF pseudosection does not predict any field with staurolite, andalusite and cordierite being stable together. As a result of more detailed modelling making use of the effective bulk composition concept, our interpretation is that the staurolite–biotite–garnet– plagioclase–muscovite–quartz sub-assemblage was present at peak metamorphic conditions, 590 C and 5.2 kbar, but that andalusite and cordierite grew later along a continuous P–T path. These minerals are not in mutual contact and are observed in separate microstructural domains with different proportions of staurolite. These domains are explained as a result of local reaction equilibrium subsystems developed during decompression and influenced by the previous peak crystal size and local modal distribution of staurolite porphyroblasts that have remained metastable. Thus, andalusite and cordierite grew synchronously, although in separate microdomains, and represent the decompression stage at 565 C and 3.5 kbar.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Wiley
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Effective Bulk Composition
dc.subject
Microstructure
dc.subject
Retrogression
dc.subject
Pseudosections
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Oceanografía, Hidrología, Recursos Hídricos
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Staurolite porphyroblast controls on local bulk compositional and microstructural changes during decompression of a St–Bt–Grt–Crd–And schist (Ancasti metamorphic complex, Sierras Pampeanas, W 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
2017-09-21T19:04:59Z
dc.journal.volume
31
dc.journal.number
2
dc.journal.pagination
131-146
dc.journal.pais
Estados Unidos
dc.journal.ciudad
Hoboken
dc.description.fil
Fil: Verdecchia, Sebastián Osvaldo. 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: Reche, J.. Universitat Autònoma de Barcelona; España
dc.description.fil
Fil: Baldo, Edgardo Gaspar Agustín. 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: Segovia Díaz, E.. Consejo Superior de Investigaciones Científicas; España. Universidad Complutense de Madrid; España
dc.description.fil
Fil: Martínez, F. J.. Universitat Autònoma de Barcelona; España
dc.journal.title
Journal Of Metamorphic Geology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/jmg.12003
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/jmg.12003/abstract


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