The Fe-Mn phosphate mineral assemblages from La Viquita Pegmatite,San Luis, Argentina

GALLISKI M. A.; RODA-ROBLES E.; HATERT F.; MÁRQUEZ ZAVALÍA M. F.; MARTÍNEZ V. A.

Ksiaz

Simposio; 7th International Symposium on Granitic Pegmatites; 2015

Uniwersytet Slaski

Accessory Fe-Mn phosphate nodulesare common in the LCT (Li,Cs,Ta) rare-element pegmatites of the San LuisRanges, Argentina. Most of these phosphates occur in pegmatites of beryl-typeand spodumene subtype. As usual in other pegmatite fields, the primaryassemblages are not very complex, consisting in members of the seriestriphylite-lithiophilite, beusite-lithiophilite, graftonite-beusite,triplite-zweiselite, and rarely bobfergusonite. The derived species formsecondary assemblages that are mineralogically more complex and normally shedlight on the conditions of the subsolidus alteration process. In thiscontribution we describe the phosphates occurring in La Viquita, a spodumenesubtype, complex rare-element pegmatite of the Rare-Element-Li (REL) classaccording to the classification of Cerný & Ercit (2005).