INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Syenite pegmatitic segregation veins from La Peña alkaline complex, Mendoza, Argentina
PAGANO GENERO, D.S.; GALLISKI, MIGUEL ÁNGEL; MARQUEZ ZAVALIA, MARIA FLORENCIA DE FATIMA; SKODA, R.; NOVÁK, M
Simposio; 7th International Symposium on Granitic Pegmatites; 2015
Veins with pegmatite textures are uncommon in basic alkaline magmas crystallized at low pressures, although some occurrences have been described (Galliski et al. 2004 and references therein). These authors indicated that development of the pegmatite textures in ijolite pegmatites at La Madera, Córdoba, Argentina, was initiated by enrichment of the melt in flux components (PO4 3-, CO32-, 2O) that inhibited nucleation and favored an increasing rate of crystal growth at high cooling rates. The syenite pegmatitic segregation veins (SPSV) of La Peña alkaline complex (LPC), initially described by Zappettini et al. (2013), represent an opportunity to explore the origin of these segregations in alkaline basic magmas. In this contribution we detail the petrography and show a few preliminary results of chemical variations of minerals obtained by EPMA, used for understanding the genesis of these specific differentiates.