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Alpine oxidation of lithium micas in Permian S-type granites (Gemeric unit, Western Carpathians, Slovakia)

Published online by Cambridge University Press:  05 July 2018

I. Petrík ,
Š. Čík ,
M. Miglierini ,
T. Vaculovič ,
I. Dianiška  and
D. Ozdín
I. Petrík*
Affiliation:
Geological Institute, Slovak Academy of Sciences, Dúbravská9, 840 05 Bratislava, Slovakia
Š. Čík
Affiliation:
Geological Institute, Slovak Academy of Sciences, Dúbravská9, 840 05 Bratislava, Slovakia
M. Miglierini
Affiliation:
Institute of Nuclear and Physical Engineering, Slovak University of Technology, Ilkovičova 3, 812 19 Bratislava, Slovakia Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University, 17. listopadu 12, 771 46 Olomouc, Czech Republic
T. Vaculovič
Affiliation:
Tomáš Vaculovič CEITEC, Masaryk University, Kamenice 5, Brno 62500, Czech Republic
I. Dianiška
Affiliation:
Mierová16, 04 801 Rožňava, Slovakia
D. Ozdín
Affiliation:
Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynskádolina, 842 15 Bratislava, Slovakia
*
E-mail: igor.petrik@savba.sk
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Abstract

Lithium micas of the zinnwaldite and phengite–Li-phengite series occur as characteristic minerals in Permian Li-F-(P) granites of the western Gemeric unit (Western Carpathians) accompanied by topaz, tourmaline, Nb, Ta, Ti, Sn oxides and aluminophosphates. The calculated Li2O contents of all the mica analysed, together with Rb2O and Cs2O were confirmed by LA-ICP-MS analyses for all the identified micas. Samples from three localities were investigated: two surficial (Surovec, Vrchsúl’ová); and one drill hole (Dlhá dolina). Zinnwaldite (polylithionite) occurs in the upper level of the Dlhá dolina granitic intrusion and in the nearby shallow satellite body of Surovec. The lower level porphyritic granites contain only siderophyllite. The Vrchsúl’ ová micas are closer in composition to Li-annite and siderophyllite. Dioctahedral micas are mostly phengites, although zinnwaldite-bearing granites are rich in late-crystallizing Li-phengite, which extensively replaces earlier zinnwaldite. The secondary Liphengite and phengite are interpreted as products of Alpine metamorphism during Cretaceous burial and subsequent exhumation of the Gemeric unit. Reactions are suggested explaining the formation of Li-phengite by reaction of zinnwaldite with phengite or with muscovite. All mica types were investigated by Mössbauer spectroscopy, which showed high degrees of oxidation (25–50% Fe3+ of total Fe) with the exception of zinnwaldite from Vrchsúl’ová, which may have preserved an original, reduced value of 10%. The metamorphic assemblage present permitted calculation of P-T-X conditions: T = 184°C, P = 320 MPa, with oxidation of siderophyllite to phengite + goethite and fO2 at ΔNN = 4.7, confirming the low-grade conditions of the Alpine metamorphism in agreement with previous estimates.

Keywords

lithium micaszinnwalditephengitePermian graniteoxidationAlpine metamorphismGemeric unitWestern CarpathiansSlovakia
Type
Research Article
Information
Mineralogical Magazine , Volume 78 , Issue 3 , June 2014 , pp. 507 - 533
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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