INVESTIGADORES
PINOTTI Lucio Pedro
artículos
Título:
Pegmatite emplacement during compressional deformation of the Guacha Corral shear zone, Córdoba, Argentina
Autor/es:
DEMARTIS, M., PINOTTI, L.P., DERAMO, F.J., CONIGLIO, J.E. Y PETRELLI, H.A.
Revista:
Revista de la AGA
Editorial:
AGA
Referencias:
Lugar: Buenos Aires; Año: 2011 p. 71 - 74
ISSN:
0328-2767
Resumen:
In the Sierra de Comechingones, Córdoba
province, Argentina, a great number of Be?Nb?Ta?UP-
rich pegmatites were grouped by Galliski (1994,
1999) in the Comechingones Pegmatitic Field (CPF),
southeastern Pampean Pegmatitic Province (Fig. 1a).
These pegmatites have a LCT signature and belong
principally to the rare-element class, beryl?columbite?
phosphate subtype, and some of them grade to the
muscovite class (Galliski 1994).
These pegmatites were emplaced at pressures
of approximately 500 MPa, synkinematically with
the crustal scale Guacha Corral shear zone (GCSZ)
development (Demartis 2010). At fi rst sight, the transfer
of magma through such a ductile, middle pressure
continental crust seems to require a huge amount of
energy. However, the GCSZ deformation provided open
spaces for the migration and ascent of pegmatite magmas,
and the high volatile content of the pegmatites enhanced
significantly the buoyant force of these pegmatite
magmas. These two points suggest a mechanism of
easy-intrusion for the pegmatite magmas through the
ductile continental crust. In this contribution, we present
of magma through such a ductile, middle pressure
continental crust seems to require a huge amount of
energy. However, the GCSZ deformation provided open
spaces for the migration and ascent of pegmatite magmas,
and the high volatile content of the pegmatites enhanced
significantly the buoyant force of these pegmatite
magmas. These two points suggest a mechanism of
easy-intrusion for the pegmatite magmas through the
ductile continental crust. In this contribution, we present
fi rst sight, the transfer
of magma through such a ductile, middle pressure
continental crust seems to require a huge amount of
energy. However, the GCSZ deformation provided open
spaces for the migration and ascent of pegmatite magmas,
and the high volatile content of the pegmatites enhanced
significantly the buoyant force of these pegmatite
magmas. These two points suggest a mechanism of
easy-intrusion for the pegmatite magmas through the
ductile continental crust. In this contribution, we present
fi eld and microstructural data from the southern part of
the CPF (Fig. 1b) that evidences syntectonic pegmatite
emplacement during the compressional deformation
of the GCSZ. We also propose two main deformation
related mechanisms for space generation that triggered
magma ascent and emplacement
the CPF (Fig. 1b) that evidences syntectonic pegmatite
emplacement during the compressional deformation
of the GCSZ. We also propose two main deformation
related mechanisms for space generation that triggered
magma ascent and emplacement
eld and microstructural data from the southern part of
the CPF (Fig. 1b) that evidences syntectonic pegmatite
emplacement during the compressional deformation
of the GCSZ. We also propose two main deformation
related mechanisms for space generation that triggered
magma ascent and emplacement
