La Viquita, Sierra de la Estanzuela, San Luis: Geología de una pegmatita de subtipo espodumeno enriquecida en óxidos de Nb-Ta-Ti-Sn.

MARTÍNEZ V. A. Y GALLISKI M. A.

Mineralogía y Metalogenia 2000

INREMI

Lugar: La Plata; Año: 2000; p. 295 - 303

La Viquita is a spodumene-subtype, complex-type, rare-element pegmatite placed at 65° 06' 30" W and 31° 51'00" S in the La Estanzuela range, Eastern Pampean Ranges. It is a 190 m long, roughly lens-shaped body, thathas 40 m wide, N42°E streak and in between 31° and 60°E dip. It is discordantly intruded in medium-grademicaschists with garnet and staurolite porfiroblasts. La Viquita has a zoned internal structure with border(Qtz+Mu), wall (Kfs+Qtz+Mu), external-intermediate zone (Kfs+Qtz+Mu+Ab+Mo), central-intermediatezone (Kfs+Qtz+Sp+Ab+Mo+Mu), internal-intermediate zone (Qtz+Kfs+Sp+Ab+M u) and a core(Qtz+Sp+Kfs). Fracture filling units have Mu+Qtz association and the replacement bodies containSp+Ab+Qtz. Besides rock-forming minerals that are: albite, K-feldspars, quartz, spodumene, muscovite andamblygonite-montebrasite, La Viquita contains beryl, apatite, tourmaline, eosphorite, ernstite, purpuriteheterosite,and a rich Nb-Ta-Sn-Ti ore bearing association that include ferrocolumbite, ferrotantalite,manganocolumbite, tapiolite, and wodginite-group minerals.