Mineral assemblages and compositional variations in
bavenite–bohseite from granitic pegmatites of the Bohemian
Massif, Czech Republic

J 2023

Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic

NOVÁK, Milan; Zdeněk DOLNÍČEK; Adam ZACHAŘ; Petr GADAS; Miroslav NEPEJCHAL et. al.

Základní údaje

Originální název

Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic

Autoři

NOVÁK, Milan; Zdeněk DOLNÍČEK; Adam ZACHAŘ; Petr GADAS; Miroslav NEPEJCHAL; Kamil SOBEK; Radek ŠKODA a Luboš VRTIŠKA

Vydání

Mineralogical Magazine, Cambridge University Press, 2023, 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: 2.800

Kód RIV

RIV/00216224:14310/23:00131000

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1180/mgm.2023.17

UT WoS

001007764000001

EID Scopus

2-s2.0-85150373127

Klíčová slova anglicky

bavenite; bohseite; mineral assemblages; composition; granitic pegmatite; Bohemian Massif

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 13. 7. 2023 09:44, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The paragenesis and composition of bavenite–bohseite were investigated in fifteen granitic pegmatites from the Bohemian Massif, Czech Republic. Three types distinct in their relation to primary Be precursors, mineral assemblages, morphology and origin were recognised: (1) primary hydrothermal bavenite–bohseite crystallised in miarolitic pockets from residual pegmatite fluids; and secondary bavenite–bohseite in two distinct types: (2) a proximal type restricted spatially to pseudomorphs after a primary Be mineral (beryl > phenakite, helvine–danalite); and (3) a distal type on brittle fractures and fissures of host pegmatite. The mineral assemblages are highly variable: (1) axinite-(Mn), smectite, calcite and pyrite; (2) bertrandite, milarite, secondary beryl, bazzite, K-feldspar, muscovite–illite, scolecite, gismondine-Ca, analcime, chlorite; and (3) muscovite, albite, quartz, epidote, pumpellyite-(Mg), pumpellyite-(Fe3+), titanite and chlorite. Electron microprobe analyses showed, in addition to major constituents (Si, Ca and Al), minor concentrations (in apfu) of Na (≤0.24), Fe (≤0.10), Mn (≤0.10) and F (≤0.36). The type 1 hydrothermal miarolitic bavenite–bohseite is mostly Al-rich (2.00–0.67 apfu) relative to type 2 proximal bavenite–bohseite and bohseite after beryl, phenakite and helvine–danalite (1.56–0.46, 0.70–0.05, 1.02–0.35 apfu, respectively); and type 3 distal bavenite–bohseite typically after beryl (1.63–0.09 apfu). Raman spectroscopy revealed that the distance between the OH– vibrational modes decreases with increasing bohseite component. The Al content of secondary type 2 proximal bavenite–bohseite is controlled by the composition of the Be precursor whereas type 3 distal bavenite–bohseite with beryl as the Be precursor is more variable and the composition is governed mainly by the composition of fluids. Calcium, a crucial component for bavenite–bohseite origins, was derived from residual pegmatite fluids (Vlastějovice, Vepice IV or Třebíč Plutons) or external sources (e.g. Drahonín IV, Věžná I or Maršíkov). Primary type 1 hydrothermal bavenite–bohseite from miarolitic pockets might have crystallised at T ≈ 300–400°C and P ≈ 200 MPa, whereas the secondary type 2 and 3 bavenite–bohseite formed at T ≈ 300–100°C and P ≈ 200–20 MPa.

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

Citovat

NOVÁK, Milan; Zdeněk DOLNÍČEK; Adam ZACHAŘ; Petr GADAS; Miroslav NEPEJCHAL; Kamil SOBEK; Radek ŠKODA a Luboš VRTIŠKA. Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic. Mineralogical Magazine. Cambridge University Press, 2023, roč. 87, č. 3, s. 415-432. ISSN 0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2023.17.

@article{2292745,
   author = {Novák, Milan and Dolníček, Zdeněk and Zachař, Adam and Gadas, Petr and Nepejchal, Miroslav and Sobek, Kamil and Škoda, Radek and Vrtiška, Luboš},
   article_number = {3},
   doi = {https://doi.org/10.1180/mgm.2023.17},
   keywords = {bavenite; bohseite; mineral assemblages; composition; granitic pegmatite; Bohemian Massif},
   language = {eng},
   issn = {0026-461X},
   journal = {Mineralogical Magazine},
   title = {Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic},
   url = {https://doi.org/10.1180/mgm.2023.17},
   volume = {87},
   year = {2023}
}

TY  - JOUR
ID  - 2292745
AU  - Novák, Milan - Dolníček, Zdeněk - Zachař, Adam - Gadas, Petr - Nepejchal, Miroslav - Sobek, Kamil - Škoda, Radek - Vrtiška, Luboš
PY  - 2023
TI  - Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic
JF  - Mineralogical Magazine
VL  - 87
IS  - 3
SP  - 415-432
EP  - 415-432
PB  - Cambridge University Press
SN  - 0026461X
KW  - bavenite
KW  - bohseite
KW  - mineral assemblages
KW  - composition
KW  - granitic pegmatite
KW  - Bohemian Massif
UR  - https://doi.org/10.1180/mgm.2023.17
N2  - The paragenesis and composition of bavenite–bohseite were investigated in fifteen granitic pegmatites from the Bohemian Massif, Czech Republic. Three types distinct in their relation to primary Be precursors, mineral assemblages, morphology and origin were recognised: (1) primary hydrothermal bavenite–bohseite crystallised in miarolitic pockets from residual pegmatite fluids; and secondary bavenite–bohseite in two distinct types: (2) a proximal type restricted spatially to pseudomorphs after a primary Be mineral (beryl > phenakite, helvine–danalite); and (3) a distal type on brittle fractures and fissures of host pegmatite. The mineral assemblages are highly variable: (1) axinite-(Mn), smectite, calcite and pyrite; (2) bertrandite, milarite, secondary beryl, bazzite, K-feldspar, muscovite–illite, scolecite, gismondine-Ca, analcime, chlorite; and (3) muscovite, albite, quartz, epidote, pumpellyite-(Mg), pumpellyite-(Fe3+), titanite and chlorite. Electron microprobe analyses showed, in addition to major constituents (Si, Ca and Al), minor concentrations (in apfu) of Na (≤0.24), Fe (≤0.10), Mn (≤0.10) and F (≤0.36). The type 1 hydrothermal miarolitic bavenite–bohseite is mostly Al-rich (2.00–0.67 apfu) relative to type 2 proximal bavenite–bohseite and bohseite after beryl, phenakite and helvine–danalite (1.56–0.46, 0.70–0.05, 1.02–0.35 apfu, respectively); and type 3 distal bavenite–bohseite typically after beryl (1.63–0.09 apfu). Raman spectroscopy revealed that the distance between the OH– vibrational modes decreases with increasing bohseite component. The Al content of secondary type 2 proximal bavenite–bohseite is controlled by the composition of the Be precursor whereas type 3 distal bavenite–bohseite with beryl as the Be precursor is more variable and the composition is governed mainly by the composition of fluids. Calcium, a crucial component for bavenite–bohseite origins, was derived from residual pegmatite fluids (Vlastějovice, Vepice IV or Třebíč Plutons) or external sources (e.g. Drahonín IV, Věžná I or Maršíkov). Primary type 1 hydrothermal bavenite–bohseite from miarolitic pockets might have crystallised at T ≈ 300–400°C and P ≈ 200 MPa, whereas the secondary type 2 and 3 bavenite–bohseite formed at T ≈ 300–100°C and P ≈ 200–20 MPa.
ER  -

NOVÁK, Milan; Zdeněk DOLNÍČEK; Adam ZACHAŘ; Petr GADAS; Miroslav NEPEJCHAL; Kamil SOBEK; Radek ŠKODA a Luboš VRTIŠKA. Mineral assemblages and compositional variations in bavenite–bohseite from granitic pegmatites of the Bohemian Massif, Czech Republic. \textit{Mineralogical Magazine}. Cambridge University Press, 2023, roč.~87, č.~3, s.~415-432. ISSN~0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2023.17.

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