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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F23%3A00132627" target="_blank" >RIV/00216224:14310/23:00132627 - isvavai.cz</a>

Result on the web

<a href="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" target="_blank" >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</a>

DOI - Digital Object Identifier

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

Result language

angličtina

Original language name

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

Original language description

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 (&lt;= 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; &lt;= 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 (&lt;= 250 MPa) metamorphic stage resulted in the local alteration of chrysoberyl to secondary Fe,Na-rich beryl, euclase, bertrandite and late muscovite.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GA19-05198S" target="_blank" >GA19-05198S: Greisenization and albitization - geological processes potentially concentrating some critical raw materials for modern technologies</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

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

Name of the periodical

Mineralogical Magazine

ISSN

0026-461X

e-ISSN

—

Volume of the periodical

87

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

369-381

UT code for WoS article

001005957900001

EID of the result in the Scopus database

2-s2.0-85151833219