INVESTIGADORES
GALLISKI Miguel Angel
artículos
Título:
The phosphate mineral assemblages from La Viquita pegmatite, San Luis, Argentina
Autor/es:
GALLISKI M. A.; RODA-ROBLES, ENCARNACIÓN; HATERT, FRÉDÉRIC; MÁRQUEZ-ZAVALÍA, M.F.; MARTÍNEZ VIVIANA
Revista:
CANADIAN MINERALOGIST
Editorial:
MINERALOGICAL ASSOC CANADA
Referencias:
Lugar: Toronto, Canada; Año: 2020 vol. 58 p. 733 - 746
ISSN:
0008-4476
Resumen:
La Viquita is a rare-element pegmatite of LCT signature, REL-Li subclass, spodumene subtype, that shows Fe . Mn mineral paragenesis instead of Mn . Fe, which is more common in the rare-element pegmatite population of the San Luis ranges. The phosphate mineral association of this pegmatite can be subdivided into (1) primary, with dendritic triphylite [(Fe/(FeþMn)¼0.72] and montebrasite?amblygonite as main phases; (2) metasomatic, with subsolidus replacement of triphylite by ferrisicklerite and heterosite; and (3) hydrothermal, with secondary growth of alluaudite at the expense of heterosite and wardite from montebrasite caused by Na-metasomatism. A Ca-rich influx under oxidizing conditions produced childrenite?eosphorite?ernstite, jahnsite-(CaMnFe), and kingsmountite. Apatite-group minerals are present throughout the processes. Very late-stage solutions formed millimetric crystals of hydroxylherderite associated with hydroxylapatite in cavities in K-feldspar
