Chrysoberyl and associated beryllium minerals resulting from metamorphic overprint of the Maršíkov - Schinderhübel III pegmatite, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27350%2F23%3A10253098" target="_blank" >RIV/61989100:27350/23:10253098 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/chrysoberyl-and-associated-beryllium-minerals-resulting-from-metamorphic-overprinting-of-the-marsikovschinderhubel-iii-pegmatite-czech-republic/BAB26257DC4AD16E79B43D6A54D68516" target="_blank" >https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/chrysoberyl-and-associated-beryllium-minerals-resulting-from-metamorphic-overprinting-of-the-marsikovschinderhubel-iii-pegmatite-czech-republic/BAB26257DC4AD16E79B43D6A54D68516</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1180/mgm.2023.22" target="_blank" >10.1180/mgm.2023.22</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Chrysoberyl and associated beryllium minerals resulting from metamorphic overprint of the Maršíkov - Schinderhübel III pegmatite, Czech Republic

Popis výsledku v původním jazyce

The Mar íkov Schinderhübel III (Hrubý Jeseník Mountains, Silesian Domain, Czech Republic) represents a classic example of chrysoberyl-bearing LCT granitic pegmatite of beryl-columbite subtype. A thin pegmatite dyke (up to 1 m thick) in biotite-amphibole gneiss is characterised by symmetrical internal zoning. Tabular and prismatic chrysoberyl crystals (LESS-THAN OR EQUAL TO3 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 and large variations of Fe content (1.1-5.3 wt.% Fe2O3; =0.09 apfu) are characteristic as well. 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) belong to the most 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 overprint of the pegmatite. Primary magmatic beryl, albite and muscovite were transformed to chrysoberyl, fibrolitic sillimanite, secondary quartz and muscovite during high-temperature (TILDE OPERATOR+D91600 oC) and medium-pressure (TILDE OPERATOR+D91250-500 MPa) prograde metamorphic stage under amphibolite facies conditions. A subsequent retrograde, low-temperature (TILDE OPERATOR+D91200-500 oC) and pressure (250 MPa) metamorphic stage resulted in the local alteration of chrysoberyl to secondary Fe,Na-rich beryl, euclase, bertrandite and late muscovite. (C) 2023 Cambridge University Press. All rights reserved.

Název v anglickém jazyce

Chrysoberyl and associated beryllium minerals resulting from metamorphic overprint of the Maršíkov - Schinderhübel III pegmatite, Czech Republic

Popis výsledku anglicky

The Mar íkov Schinderhübel III (Hrubý Jeseník Mountains, Silesian Domain, Czech Republic) represents a classic example of chrysoberyl-bearing LCT granitic pegmatite of beryl-columbite subtype. A thin pegmatite dyke (up to 1 m thick) in biotite-amphibole gneiss is characterised by symmetrical internal zoning. Tabular and prismatic chrysoberyl crystals (LESS-THAN OR EQUAL TO3 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 and large variations of Fe content (1.1-5.3 wt.% Fe2O3; =0.09 apfu) are characteristic as well. 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) belong to the most 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 overprint of the pegmatite. Primary magmatic beryl, albite and muscovite were transformed to chrysoberyl, fibrolitic sillimanite, secondary quartz and muscovite during high-temperature (TILDE OPERATOR+D91600 oC) and medium-pressure (TILDE OPERATOR+D91250-500 MPa) prograde metamorphic stage under amphibolite facies conditions. A subsequent retrograde, low-temperature (TILDE OPERATOR+D91200-500 oC) and pressure (250 MPa) metamorphic stage resulted in the local alteration of chrysoberyl to secondary Fe,Na-rich beryl, euclase, bertrandite and late muscovite. (C) 2023 Cambridge University Press. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

1471-8022

Svazek periodika

87

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

—

Kód UT WoS článku

001005957900001

EID výsledku v databázi Scopus

2-s2.0-85151833219