Phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina

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Marco E. Ciriotti
Messaggi: 27902
Iscritto il: ven 25 giu, 2004 11:31
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Phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina

Messaggio da Marco E. Ciriotti » ven 09 ott, 2020 13:48

Prossima pubblicazione.

Referenza:
▪ Galliski, M.A., Roda-Robles, E., Hatert, F., Márquez-Zavalía, M.F., Martínez, V.A. (2020): The phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina. Canadian Mineralogist, 58, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 27902
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: Phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina

Messaggio da Marco E. Ciriotti » ven 09 apr, 2021 11:57

Pubblicazione effettuata.

Referenza:
▪ Galliski, M.A., Roda-Robles, E., Hatert, F., Márquez-Zavalía, M.F., Martínez, V.A. (2020): The phosphate mineral assemblages from La Viquita Pegmatite, San Luis, Argentina. Canadian Mineralogist, 58, 733–746.

Abstract:
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/(Fe + Mn) = 0.72] 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.
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