Beryllium minerals as monitors of geochemical evolution from
magmatic to hydrothermal stage; examples from NYF pegmatites of
the Třebíč Pluton, Czech Republic

J 2020

Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic

ZACHAŘ, Adam; Milan NOVÁK a Radek ŠKODA

Základní údaje

Originální název

Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic

Autoři

ZACHAŘ, Adam; Milan NOVÁK a Radek ŠKODA

Vydání

Journal of Geosciences, Praha, Czech Geological Survey, 2020, 1802-6222

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.525

Kód RIV

RIV/00216224:14310/20:00114548

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.3190/jgeosci.307

UT WoS

000580587700003

EID Scopus

2-s2.0-85092459304

Klíčová slova anglicky

beryl; phenakite; helvite-danalite; milarite- and gadolinite-group minerals; bohseite-bavenite; NYF pegmatites; Trebic Pluton

Štítky

14315010, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 7. 12. 2020 11:44, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Mineral assemblages of primary and secondary Be-minerals were examined in intraplutonic euxenite-type NYF pegmatites of the Trebic Pluton, Moldanubian Zone occurring between Trebic and Vladislav south of the Trebic fault. Primary magmatic Be-minerals crystallized mainly in massive pegmatite (paragenetic type I) including common beryl I, helvite-danalite I, and a rare phenakite I. Rare primary hydrothermal beryl II and phenakite II occur in miarolitic pockets (paragenetic type II). Secondary hydrothermal Be-minerals replaced primary precursors or filled fractures and secondary cavities, or they are associated with "adularia" and quart. (paragenetic type III). They include minerals of bohseite-bavenite series, less abundant beryl III, bazzite III, helvite-danalite III , milarite-agalchanovite-(Y) III, phenakite III, and datolite-hingganite-(Y) III. Chemical composition of the individual minerals is characterized by elevated contents of Na, Cs, Mg, Fe, Sc in beryl I and II; Na, Ca, Mg, Fe, Al in bazzite III; REE in milarite-agakhanovite-(Y) III; variations in Fe/Mn in helvite-danalite and high variation of Al in bohseite-bavenite series. Replacement reactions of primary Be-minerals are commonly complex and the sequence of crystallization of secondary Be-minerals is not defined; minerals of bohseite-bavenite series are mostly the latest. Beryl usually occurs in pegmatites with rare tourmaline, whereas helvite-danalite bearing pegmatites are tourmaline-rich. Abundant tourmaline in pegmatites with helvite-danalite and its scarcity in beryl-bearing pegmatites indicate that early tourmaline crystallization affected activity of Al in the parental medium and thus may have controlled formation of primary Be-minerals (beryl - higher Al, helvite-danalite - lower Al) which crystallized later. Secondary Be-minerals with dominant minerals of bohseite-bavenite series and milarite suggest high activity of Ca in fluids. Variations in chemical composition (Al contents) of bohseite-bavenite series were controlled by the chemical composition of the precursor. High variability of primary magmatic Be-minerals within a single pegmatite district is exceptional and it is constrained by variable activities of Si and mainly Al, divalent cations - Ca, Mn, Fe, Zn and Mg, trivalent cations - REEs, Sc, and B, S and f(O2) in the individual pegmatites.

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

Citovat

ZACHAŘ, Adam; Milan NOVÁK a Radek ŠKODA. Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic. Journal of Geosciences. Praha: Czech Geological Survey, 2020, roč. 65, č. 3, s. 153-172. ISSN 1802-6222. Dostupné z: https://doi.org/10.3190/jgeosci.307.

@article{1705156,
   author = {Zachař, Adam and Novák, Milan and Škoda, Radek},
   article_location = {Praha},
   article_number = {3},
   doi = {https://doi.org/10.3190/jgeosci.307},
   keywords = {beryl; phenakite; helvite-danalite; milarite- and gadolinite-group minerals; bohseite-bavenite; NYF pegmatites; Trebic Pluton},
   language = {eng},
   issn = {1802-6222},
   journal = {Journal of Geosciences},
   title = {Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic},
   url = {http://dx.doi.org/10.3190/jgeosci.307},
   volume = {65},
   year = {2020}
}

TY  - JOUR
ID  - 1705156
AU  - Zachař, Adam - Novák, Milan - Škoda, Radek
PY  - 2020
TI  - Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic
JF  - Journal of Geosciences
VL  - 65
IS  - 3
SP  - 153-172
EP  - 153-172
PB  - Czech Geological Survey
SN  - 18026222
KW  - beryl
KW  - phenakite
KW  - helvite-danalite
KW  - milarite- and gadolinite-group minerals
KW  - bohseite-bavenite
KW  - NYF pegmatites
KW  - Trebic Pluton
UR  - http://dx.doi.org/10.3190/jgeosci.307
L2  - http://dx.doi.org/10.3190/jgeosci.307
N2  - Mineral assemblages of primary and secondary Be-minerals were examined in intraplutonic euxenite-type NYF pegmatites of the Trebic Pluton, Moldanubian Zone occurring between Trebic and Vladislav south of the Trebic fault. Primary magmatic Be-minerals crystallized mainly in massive pegmatite (paragenetic type I) including common beryl I, helvite-danalite I, and a rare phenakite I. Rare primary hydrothermal beryl II and phenakite II occur in miarolitic pockets (paragenetic type II). Secondary hydrothermal Be-minerals replaced primary precursors or filled fractures and secondary cavities, or they are associated with "adularia" and quart. (paragenetic type III). They include minerals of bohseite-bavenite series, less abundant beryl III, bazzite III, helvite-danalite III , milarite-agalchanovite-(Y) III, phenakite III, and datolite-hingganite-(Y) III. Chemical composition of the individual minerals is characterized by elevated contents of Na, Cs, Mg, Fe, Sc in beryl I and II; Na, Ca, Mg, Fe, Al in bazzite III; REE in milarite-agakhanovite-(Y) III; variations in Fe/Mn in helvite-danalite and high variation of Al in bohseite-bavenite series. Replacement reactions of primary Be-minerals are commonly complex and the sequence of crystallization of secondary Be-minerals is not defined; minerals of bohseite-bavenite series are mostly the latest. Beryl usually occurs in pegmatites with rare tourmaline, whereas helvite-danalite bearing pegmatites are tourmaline-rich. Abundant tourmaline in pegmatites with helvite-danalite and its scarcity in beryl-bearing pegmatites indicate that early tourmaline crystallization affected activity of Al in the parental medium and thus may have controlled formation of primary Be-minerals (beryl - higher Al, helvite-danalite - lower Al) which crystallized later. Secondary Be-minerals with dominant minerals of bohseite-bavenite series and milarite suggest high activity of Ca in fluids. Variations in chemical composition (Al contents) of bohseite-bavenite series were controlled by the chemical composition of the precursor. High variability of primary magmatic Be-minerals within a single pegmatite district is exceptional and it is constrained by variable activities of Si and mainly Al, divalent cations - Ca, Mn, Fe, Zn and Mg, trivalent cations - REEs, Sc, and B, S and f(O2) in the individual pegmatites.
ER  -

ZACHAŘ, Adam; Milan NOVÁK a Radek ŠKODA. Beryllium minerals as monitors of geochemical evolution from magmatic to hydrothermal stage; examples from NYF pegmatites of the Třebíč Pluton, Czech Republic. \textit{Journal of Geosciences}. Praha: Czech Geological Survey, 2020, roč.~65, č.~3, s.~153-172. ISSN~1802-6222. Dostupné z: https://doi.org/10.3190/jgeosci.307.

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