Contrasting assemblages of secondary minerals after beryl from
the granitic pegmatites Drahonín IV and Věžná I; evidence for
high variability of mineralised fluids in the Rožná-Olší ore
field area, Czech Republic

J 2024

Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic

NOVÁK, Milan; Petr GADAS; Kamil SOBEK; Jiri TOMAN; Drahos SIKOLA et. al.

Základní údaje

Originální název

Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic

Autoři

NOVÁK, Milan; Petr GADAS; Kamil SOBEK; Jiri TOMAN a Drahos SIKOLA

Vydání

Mineralogical Magazine, Cambridge University Press, 2024, 0026-461X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.400

Kód RIV

RIV/00216224:14310/24:00139031

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1180/mgm.2024.100

UT WoS

001421387000001

EID Scopus

2-s2.0-86000433725

Klíčová slova anglicky

beryl; secondary Be minerals; granitic pegmatites; internal hydrothermal fluids; external hydrothermal fluids

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 31. 3. 2025 12:30, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

This work presents data for the mineral assemblages, composition and Raman spectroscopy of proximal secondary Be and associated minerals in pseudomorphs after beryl from granitic pegmatites located along the contacts of major regional geological units. The pegmatites differ in their position relative to the ductile to brittle shear zones within the Rožná-Olší ore field (U-deposit), Czech Republic. Extensive dissolution of beryl crystals in the beryl–columbite pegmatites Drahonín IV and Věžná I situated within or close to the shear zones is evident in contrast to minor alteration of beryl in the Dolní Rožínka and Kovářová pegmatites located outside of the shear zones. Near-total replacement of beryl crystals, up to 40 cm in length, from the Drahonín IV pegmatite, located in the Olší shear zone formed the following secondary Be minerals in order of their abundance: bavenite–bohseite > bertrandite ≫ milarite > hydroxylgugiaite. This assemblage is also characterised by the presence of sulfides (pyrite, galena, sphalerite) and zeolites. Such an extensive replacement process required a substantial fluid flow and is very possibly related to the pre-uranium quartz–sulfide and carbonate–sulfide mineralisation events within the Rožná-Olší ore field. Alteration products resulting from breakdown of beryl in the Věžná I pegmatite follow the sequential substages (bertrandite + K-feldspar ± harmotome → epididymite + K-feldspar → hydroxylgugiaite + K-feldspar) and locally show cross-cutting textures. These assemblages were generated by post-magmatic residual fluids (early assemblage bertrandite + K-feldspar) as well as fluids related to a retrograde stage of metamorphism, compositionally contrasting with the host serpentinite, and perhaps also hydrothermal processes associated with the Olší shear zone. The pegmatites Dolní Rožínka and Kovářová, located outside of the shear zones, exhibit only a low degree of alteration and have differing textural and paragenetic development. Highly variable assemblages of secondary minerals after beryl are excellent mineral indicators of hydrothermal overprinting in granitic pegmatites during a variety of subsolidus processes.

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

Citovat

NOVÁK, Milan; Petr GADAS; Kamil SOBEK; Jiri TOMAN a Drahos SIKOLA. Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic. Mineralogical Magazine. Cambridge University Press, 2024, roč. 88, č. 6, s. 766-786. ISSN 0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2024.100.

@article{2483118,
   author = {Novák, Milan and Gadas, Petr and Sobek, Kamil and Toman, Jiri and Sikola, Drahos},
   article_number = {6},
   doi = {https://doi.org/10.1180/mgm.2024.100},
   keywords = {beryl; secondary Be minerals; granitic pegmatites; internal hydrothermal fluids; external hydrothermal fluids},
   language = {eng},
   issn = {0026-461X},
   journal = {Mineralogical Magazine},
   title = {Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic},
   url = {https://doi.org/10.1180/mgm.2024.100},
   volume = {88},
   year = {2024}
}

TY  - JOUR
ID  - 2483118
AU  - Novák, Milan - Gadas, Petr - Sobek, Kamil - Toman, Jiri - Sikola, Drahos
PY  - 2024
TI  - Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic
JF  - Mineralogical Magazine
VL  - 88
IS  - 6
SP  - 766-786
EP  - 766-786
PB  - Cambridge University Press
SN  - 0026461X
KW  - beryl
KW  - secondary Be minerals
KW  - granitic pegmatites
KW  - internal hydrothermal fluids
KW  - external hydrothermal fluids
UR  - https://doi.org/10.1180/mgm.2024.100
N2  - This work presents data for the mineral assemblages, composition and Raman spectroscopy of proximal secondary Be and associated minerals in pseudomorphs after beryl from granitic pegmatites located along the contacts of major regional geological units. The pegmatites differ in their position relative to the ductile to brittle shear zones within the Rožná-Olší ore field (U-deposit), Czech Republic. Extensive dissolution of beryl crystals in the beryl–columbite pegmatites Drahonín IV and Věžná I situated within or close to the shear zones is evident in contrast to minor alteration of beryl in the Dolní Rožínka and Kovářová pegmatites located outside of the shear zones. Near-total replacement of beryl crystals, up to 40 cm in length, from the Drahonín IV pegmatite, located in the Olší shear zone formed the following secondary Be minerals in order of their abundance: bavenite–bohseite > bertrandite ≫ milarite > hydroxylgugiaite. This assemblage is also characterised by the presence of sulfides (pyrite, galena, sphalerite) and zeolites. Such an extensive replacement process required a substantial fluid flow and is very possibly related to the pre-uranium quartz–sulfide and carbonate–sulfide mineralisation events within the Rožná-Olší ore field. Alteration products resulting from breakdown of beryl in the Věžná I pegmatite follow the sequential substages (bertrandite + K-feldspar ± harmotome → epididymite + K-feldspar → hydroxylgugiaite + K-feldspar) and locally show cross-cutting textures. These assemblages were generated by post-magmatic residual fluids (early assemblage bertrandite + K-feldspar) as well as fluids related to a retrograde stage of metamorphism, compositionally contrasting with the host serpentinite, and perhaps also hydrothermal processes associated with the Olší shear zone. The pegmatites Dolní Rožínka and Kovářová, located outside of the shear zones, exhibit only a low degree of alteration and have differing textural and paragenetic development. Highly variable assemblages of secondary minerals after beryl are excellent mineral indicators of hydrothermal overprinting in granitic pegmatites during a variety of subsolidus processes.
ER  -

NOVÁK, Milan; Petr GADAS; Kamil SOBEK; Jiri TOMAN a Drahos SIKOLA. Contrasting assemblages of secondary minerals after beryl from the granitic pegmatites Drahonín IV and Věžná I; evidence for high variability of mineralised fluids in the Rožná-Olší ore field area, Czech Republic. \textit{Mineralogical Magazine}. Cambridge University Press, 2024, roč.~88, č.~6, s.~766-786. ISSN~0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2024.100.

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