2023
Chrysoberyl and associated beryllium minerals resulting from metamorphic overprinting of the Maršíkov–Schinderhübel III pegmatite, Czech Republic
RYBNIKOVA, Olena, Pavel UHER, Milan NOVÁK, Stepan CHLADEK, Peter BACIK et. al.Základní údaje
Originální název
Chrysoberyl and associated beryllium minerals resulting from metamorphic overprinting of the Maršíkov–Schinderhübel III pegmatite, Czech Republic
Autoři
RYBNIKOVA, Olena, Pavel UHER, Milan NOVÁK (203 Česká republika, domácí), Stepan CHLADEK, Peter BACIK, Sergii KURYLO a Tomáš VACULOVIČ (203 Česká republika, domácí)
Vydání
Mineralogical Magazine, London, Mineralogical Society, 2023, 0026-461X
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10505 Geology
Stát vydavatele
Velká Británie a Severní Irsko
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Impakt faktor
Impact factor: 2.700 v roce 2022
Kód RIV
RIV/00216224:14310/23:00132627
Organizační jednotka
Přírodovědecká fakulta
UT WoS
001005957900001
Klíčová slova anglicky
chrysoberyl; beryl; euclase; bertrandite; sillimanite; granitic pegmatite; metamorphic overprint
Štítky
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 12. 1. 2024 13:55, Mgr. Marie Šípková, DiS.
Anotace
V originále
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.
Návaznosti
GA19-05198S, projekt VaV |
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