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@article{2352465,
author = {Rybnikova, Olena and Uher, Pavel and Novák, Milan and Chladek, Stepan and Bacik, Peter and Kurylo, Sergii and Vaculovič, Tomáš},
article_location = {London},
article_number = {3},
doi = {http://dx.doi.org/10.1180/mgm.2023.22},
keywords = {chrysoberyl; beryl; euclase; bertrandite; sillimanite; granitic pegmatite; metamorphic overprint},
language = {eng},
issn = {0026-461X},
journal = {Mineralogical Magazine},
title = {Chrysoberyl and associated beryllium minerals resulting from metamorphic overprinting of the Maršíkov–Schinderhübel III pegmatite, Czech Republic},
url = {https://www.cambridge.org/core/journals/mineralogical-magazine/article/chrysoberyl-and-associated-beryllium-minerals-resulting-from-metamorphic-overprinting-of-the-marsikovschinderhubel-iii-pegmatite-czech-republic/BAB26257DC4AD16E79B43D6A54D68516},
volume = {87},
year = {2023}
}
TY - JOUR
ID - 2352465
AU - Rybnikova, Olena - Uher, Pavel - Novák, Milan - Chladek, Stepan - Bacik, Peter - Kurylo, Sergii - Vaculovič, Tomáš
PY - 2023
TI - Chrysoberyl and associated beryllium minerals resulting from metamorphic overprinting of the Maršíkov–Schinderhübel III pegmatite, Czech Republic
JF - Mineralogical Magazine
VL - 87
IS - 3
SP - 369-381
EP - 369-381
PB - Mineralogical Society
SN - 0026461X
KW - chrysoberyl
KW - beryl
KW - euclase
KW - bertrandite
KW - sillimanite
KW - granitic pegmatite
KW - metamorphic overprint
UR - https://www.cambridge.org/core/journals/mineralogical-magazine/article/chrysoberyl-and-associated-beryllium-minerals-resulting-from-metamorphic-overprinting-of-the-marsikovschinderhubel-iii-pegmatite-czech-republic/BAB26257DC4AD16E79B43D6A54D68516
N2 - The Marsikov-Schinderhubel III pegmatite in the HrubATIN SMALL LETTER Y WITH ACUTE Jesenik Mountains, Silesian Domain, Czech Republic, is a classic example of chrysoberyl-bearing LCT granitic pegmatite of beryl-columbite subtype. This thin pegmatite dyke, (up to 1 m in thickness in biotite-amphibole gneiss is characterised by symmetrical internal zoning. Tabular and prismatic chrysoberyl crystals (<= 3 cm) occur typically in the intermediate albite-rich unit and rarely in the quartz core. Chrysoberyl microtextures are quite complex; their crystals are irregularly patchy, concentric or fine oscillatory zoned with large variations in Fe content (1.1-5.3 wt.% Fe2O3; <= 0.09 apfu). Chrysoberyl compositions reveal dominant Fe3+ = Al3+ and minor Fe2+ + Ti4+ = 2(Al, Fe)(3+) substitution mechanisms in the octahedral sites. Tin, Ga, and V (determined by LA-ICP-MS) are characteristic trace elements incorporated in the chrysoberyl structure, whereas anomalously high Ta and Nb concentrations (thousands ppm) in chrysoberyl are probably caused by nano- to micro-inclusions of Nb-Ta oxide minerals; especially columbite-tantalite. Textural relationships between associated minerals, distinct schistosity of the pegmatite parallel to the host gneiss foliation and fragmentation of the pegmatite body into blocks as a result of superimposed stress are clear evidence for deformation and metamorphic overprinting of the pegmatite. Primary magmatic beryl, albite and muscovite were transformed to chrysoberyl, fibrolitic sillimanite, secondary quartz and muscovite during a high-temperature (similar to 600 degrees C) and medium-pressure (similar to 250-500 MPa) prograde metamorphic stage under amphibolite-facies conditions. A subsequent retrograde, low-temperature (similar to 200-500 degrees C) and pressure (<= 250 MPa) metamorphic stage resulted in the local alteration of chrysoberyl to secondary Fe,Na-rich beryl, euclase, bertrandite and late muscovite.
ER -
RYBNIKOVA, Olena, Pavel UHER, Milan NOVÁK, Stepan CHLADEK, Peter BACIK, Sergii KURYLO and Tomáš VACULOVIČ. Chrysoberyl and associated beryllium minerals resulting from metamorphic overprinting of the Maršíkov–Schinderhübel III pegmatite, Czech Republic. \textit{Mineralogical Magazine}. London: Mineralogical Society, 2023, vol.~87, No~3, p.~369-381. ISSN~0026-461X. Available from: https://dx.doi.org/10.1180/mgm.2023.22.
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