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Microlite-group minerals: tracers of complex post-magmatic evolution in beryl–columbite granitic pegmatites, Maršíkov District, Bohemian Massif, Czech Republic

Published online by Cambridge University Press:  14 July 2021

Štěpán Chládek Open the ORCID record for Štěpán Chládek [Opens in a new window] ,
Pavel Uher ,
Milan Novák ,
Peter Bačík  and
Tomáš Opletal
Štěpán Chládek*
Affiliation:
Department of Geological Engineering, Faculty of Mining and Geology, VŠB – Technical University of Ostrava, 17. listopadu 15, 708 33 Poruba-Ostrava, Czech Republic
Pavel Uher
Affiliation:
Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia
Milan Novák
Affiliation:
Department of Geological Sciences, Masaryk University, Kotlářská 2, Brno 611 37, Czech Republic
Peter Bačík
Affiliation:
Department of Mineralogy, Petrology and Economic Geology, Faculty of Natural Sciences, Comenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia
Tomáš Opletal
Affiliation:
Department of Analytical Chemistry, Palacký University, 17. listopadu 12, Olomouc 771 46, Czech Republic
*
*Author for correspondence: Štěpán Chládek, Email: st.chladek@seznam.cz
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Abstract

Microlite-group minerals occur as common replacement products after primary and secondary columbite-group minerals (CGM) in albitised blocky K-feldspar and in coarse-grained, muscovite-rich units of the Schinderhübel I, Scheibengraben and Bienergraben beryl–columbite pegmatites in the Maršíkov District (Silesian Unit, Bohemian Massif, Czech Republic). Textural and compositional variations of microlite-group minerals were examined using electron probe micro-analyses and microRaman spectroscopy (μRS). A complex post-magmatic evolution of the pegmatites and the following microlite populations (Mic) and related processes were found: (1) precipitation of U, Na-rich and F-poor Mic I on cracks in CGM; (2) alteration of Mic I to U-rich together with Na- and F-poor Mic II; and (3) partial replacement of Mic I and II by Mic III with a distinct Na, U and Ti loss and Ca and F gain. Stage (2) includes an extensive leaching of Na, without U loss. The final stage (3) produced euhedral-to-subhedral oscillatory zoned Ca and F enriched Mic III with distinctly different composition to the previous F-poor and A-site vacant Mic II. Aggregates of fersmite are associated commonly with Mic III. Distal Mic IIId occurs locally on cracks in K-feldspar or quartz, with compositions analogous to Mic III. Compositional variations and textural features of microlite-group minerals during dissolution–reprecipitation processes serve as sensitive tracers of post-magmatic evolution in granitic pegmatites recording complex interactions between magmatic pegmatite units and externally derived, hydrothermal metamorphic fluids.

Keywords

granitic pegmatitesberyl–columbite subtypeNb–Ta mineralsmicrolitecolumbitetantalitefersmitecrystal chemistryhydrothermal alterationrecrystallisation
Type
Article
Information
Mineralogical Magazine , Volume 85 , Issue 5 , October 2021 , pp. 725 - 743
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Associate Editor: Aniket Chakrabarty

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