J 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
Název: Greisenizace a albitizace - geologické procesy s potenciálem koncentrovat některé kritické suroviny pro moderní technologie (Akronym: GREISEN)
Investor: Grantová agentura ČR, Greisenizace a albitizace - geologické procesy s potenciálem koncentrovat některé kritické suroviny pro moderní technologie