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Artículo

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)

Verdecchia, Sebastián OsvaldoIcon ; Reche, J.; Baldo, Edgardo Gaspar AgustínIcon ; Segovia Díaz, E.; Martínez, F. J.
Fecha de publicación: 10/2012
Editorial: Wiley
Revista: Journal Of Metamorphic Geology
ISSN: 0263-4929
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Oceanografía, Hidrología, Recursos Hídricos

Resumen

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.
Palabras clave: Effective Bulk Composition , Microstructure , Retrogression , Pseudosections
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/24992
DOI: http://dx.doi.org/10.1111/jmg.12003
URL: http://onlinelibrary.wiley.com/doi/10.1111/jmg.12003/abstract
Colecciones
Articulos(CICTERRA)
Articulos de CENTRO DE INVEST.EN CS.DE LA TIERRA
Citación
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
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