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@article{1812460,
author = {Chládek, Štěpán and Uher, Pavel and Novák, Milan and Bačík, Peter and Opletal, Tomáš},
article_number = {5},
doi = {http://dx.doi.org/10.1180/mgm.2021.58},
keywords = {granitic pegmatites; beryl-columbite subtype; Nb-Ta minerals; microlite; columbite; tantalite; fersmite; crystal chemistry; hydrothermal alteration; recrystallisation},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {Microlite-group minerals: tracers of complex post-magmatic evolution in beryl–columbite granitic pegmatites, Maršíkov District, Bohemian Massif, Czech Republic},
url = {https://www.cambridge.org/core/journals/mineralogical-magazine/article/microlitegroup-minerals-tracers-of-complex-postmagmatic-evolution-in-berylcolumbite-granitic-pegmatites-marsikov-district-bohemian-massif-czech-republic/B2D8DBE1935150ABEAD88BE8EF2442},
volume = {85},
year = {2021}
}
TY - JOUR
ID - 1812460
AU - Chládek, Štěpán - Uher, Pavel - Novák, Milan - Bačík, Peter - Opletal, Tomáš
PY - 2021
TI - Microlite-group minerals: tracers of complex post-magmatic evolution in beryl–columbite granitic pegmatites, Maršíkov District, Bohemian Massif, Czech Republic
JF - Mineralogical Magazine
VL - 85
IS - 5
SP - 725-743
EP - 725-743
PB - Mineralogical Society
SN - 0026461X
KW - granitic pegmatites
KW - beryl-columbite subtype
KW - Nb-Ta minerals
KW - microlite
KW - columbite
KW - tantalite
KW - fersmite
KW - crystal chemistry
KW - hydrothermal alteration
KW - recrystallisation
UR - https://www.cambridge.org/core/journals/mineralogical-magazine/article/microlitegroup-minerals-tracers-of-complex-postmagmatic-evolution-in-berylcolumbite-granitic-pegmatites-marsikov-district-bohemian-massif-czech-republic/B2D8DBE1935150ABEAD88BE8EF2442
N2 - 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 Schinderhubel I, Scheibengraben and Bienergraben beryl-columbite pegmatites in the Marikov 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 (mu RS). 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.
ER -
CHLÁDEK, Štěpán, Pavel UHER, Milan NOVÁK, Peter BAČÍK a Tomáš OPLETAL. Microlite-group minerals: tracers of complex post-magmatic evolution in beryl–columbite granitic pegmatites, Maršíkov District, Bohemian Massif, Czech Republic. \textit{Mineralogical Magazine}. Mineralogical Society, roč.~85, č.~5, s.~725-743. ISSN~0026-461X. doi:10.1180/mgm.2021.58. 2021.
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