| Título: | Andalusite and Na- and Li-rich cordierite in the La Costa pluton,Sierras Pampeanas, Argentina: textural and chemical evidencefor a magmatic origin |
| Autores: | Alasino, Pablo H. ; Dahlquist, Juan A. ; Galindo Francisco, Mª del Carmen ; Casquet, César ; Saavedra, Julio |
| Tipo de documento: | texto impreso |
| Editorial: | Springer Science Business Media, 2010 |
| Dimensiones: | application/pdf |
| Nota general: | info:eu-repo/semantics/openAccess |
| Idiomas: | |
| Palabras clave: | Estado = Publicado , Materia = Ciencias: Geología: Petrología , Tipo = Artículo |
| Resumen: |
The La Costa pluton in the Sierra de Velasco (NW Argentina) consists of S-type granitoids that can be grouped into three igneous facies: the alkali-rich Santa Cruz facies (SCF, SiO2 *67 wt%) distinguished by the presence of andalusite and Na- and Li-rich cordierite (Na2O = 1.55–1.77 wt% and Li2O = 0.14–0.66 wt%), the Anillaco facies (SiO2 *74 wt%) with a significant proportion of Mn-rich garnet, and the Anjullo´n facies (SiO2 *75 wt%) with abundant albitic plagioclase. The petrography, mineral chemistry and whole-rock geochemistry of the SCF are compatible with magmatic crystallization of Na- and Li-rich cordierite, andalusite and muscovite from the peraluminous magma under moderate P–T conditions (*1.9 kbar and ca. 735C). The high Li content of cordierite in the SCF is unusual for granitic rocks of intermediate composition. |
| En línea: | https://eprints.ucm.es/id/eprint/11393/1/alasino_2009.pdf |
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