Secondary beryl in cordierite/sekaninaite pseudomorphs from
granitic pegmatites – A monitor of elevated content of
beryllium in the precursor

J 2020

Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor

GADAS, Petr; Milan NOVÁK; Michaela VAŠINOVÁ GALIOVÁ; Adam SZUSZKIEWICZ; Adam PIECZKA et. al.

Základní údaje

Originální název

Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor

Autoři

GADAS, Petr (203 Česká republika, garant, domácí); Milan NOVÁK (203 Česká republika, domácí); Michaela VAŠINOVÁ GALIOVÁ; Adam SZUSZKIEWICZ; Adam PIECZKA; Jakub HAIFLER (203 Česká republika, domácí) a Jan CEMPÍREK (203 Česká republika, domácí)

Vydání

Canadian Mineralogist, Mineralogical Association of Canada, 2020, 0008-4476

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10504 Mineralogy

Stát vydavatele

Kanada

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 1.165

Kód RIV

RIV/00216224:14310/20:00118576

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.3749/canmin.2000014

UT WoS

000637945400008

EID Scopus

2-s2.0-85104959168

Klíčová slova anglicky

cordierite; sekaninaite; secondary beryl; alteration; residual fluids; pegmatite

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 13. 5. 2021 18:31, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

Cordierite-group minerals (cordierite and sekaninaite) from granitic pegmatites are often strongly to completely altered to a fine- or coarse-grained mixture of muscovite, chlorite and/or, biotite, along with several less common secondary minerals, including mainly paragonite, tourmaline, and secondary beryl. The mixture is a common product of early subsolidus hydrothermal alteration at the examined pegmatites of the beryl-columbite subtype – Věžná I and Drahonín (Moldanubian Zone, Czech Republic) and Mount Begbie (Shuswap Complex, Canada); of the beryl-columbite-phosphate subtype – Szklary (Góry Sowie Block, Poland); and of miarolitic intragranitic pegmatites – Zimnik (Massif Strzegom-Sobótka, Poland). We studied in detail (EPMA, LA-ICP-MS) relics of primary cordierite/sekaninaite: Věžná I (Crd77–72Sek27–22MnCrd2–1, Be = 0.39–0.25 apfu, Li = 0.06–0.04 apfu), Drahonín (Crd13–9Sek74–71MnCrd17–16, Be = 0.24–0.18 apfu, Li = 0.07–0.05 apfu), Szklary (Crd50–49Sek30–26MnCrd25–21, Be = 0.45–0.41 apfu, Li ≤ 0.02 apfu), Mount Begbie (Crd34–33Sek53–43MnCrd24–14, Be = 0.33–0.29 apfu, Li = 0.26–0.23 apfu), and Zimnik (Crd2–1Sek75–71MnCrd28–23, Be = 0.25–0.15 apfu, Li = 0.18–0.12 apfu). Secondary beryl has a similar Mg/(Mg+Fe) ratio to its cordierite/sekaninaite precursor but is Mn depleted. The mineral assemblages and textures of the pseudomorphs were examined with a focus on secondary beryl, which forms anhedral grains to subhedral elongated crystals, up to 0.3 mm in size, or aggregates of these in textural equilibrium with associated phyllosilicates and tourmaline. Tourmaline is known from Věžná I, Drahonín, Mount Begbie, and Zimnik, the last also with topaz and “zinnwaldite” (a mineral with chemical composition between siderophyllite and polylithionite). Secondary beryl in pseudomorphs after cordierite/sekaninaite from granitic pegmatites and more evolved granites may have been often overlooked; hence, we present its textures and morphology so that it can be recognized during routine EPMA study and to study the source of elevated concentrations of Be in primary cordierite/sekaninaite. The empirical limit of detection of secondary beryl in pseudomorphs is ∼500–1000 ppm Be, which corresponds to ∼1–2 vol.% of secondary beryl. The chemical composition of the secondary beryl and other minerals indicate that the fluids responsible for the alteration were exsolved from the residual pegmatite melt and were not contaminated by fluids from the host rocks.

Návaznosti

GA17-17276S, projekt VaV

Název: Turmalín - indikátor geologických procesů

Investor: Grantová agentura ČR, Turmalín - indikátor geologických procesů

Citovat

GADAS, Petr; Milan NOVÁK; Michaela VAŠINOVÁ GALIOVÁ; Adam SZUSZKIEWICZ; Adam PIECZKA; Jakub HAIFLER a Jan CEMPÍREK. Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor. Canadian Mineralogist. Mineralogical Association of Canada, 2020, roč. 58, č. 6, s. 785-802. ISSN 0008-4476. Dostupné z: https://doi.org/10.3749/canmin.2000014.

@article{1768096,
   author = {Gadas, Petr and Novák, Milan and Vašinová Galiová, Michaela and Szuszkiewicz, Adam and Pieczka, Adam and Haifler, Jakub and Cempírek, Jan},
   article_number = {6},
   doi = {https://doi.org/10.3749/canmin.2000014},
   keywords = {cordierite; sekaninaite; secondary beryl; alteration; residual fluids; pegmatite},
   language = {eng},
   issn = {0008-4476},
   journal = {Canadian Mineralogist},
   title = {Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor},
   url = {https://doi.org/10.3749/canmin.2000014},
   volume = {58},
   year = {2020}
}

TY  - JOUR
ID  - 1768096
AU  - Gadas, Petr - Novák, Milan - Vašinová Galiová, Michaela - Szuszkiewicz, Adam - Pieczka, Adam - Haifler, Jakub - Cempírek, Jan
PY  - 2020
TI  - Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor
JF  - Canadian Mineralogist
VL  - 58
IS  - 6
SP  - 785-802
EP  - 785-802
PB  - Mineralogical Association of Canada
SN  - 00084476
KW  - cordierite
KW  - sekaninaite
KW  - secondary beryl
KW  - alteration
KW  - residual fluids
KW  - pegmatite
UR  - https://doi.org/10.3749/canmin.2000014
N2  - Cordierite-group minerals (cordierite and sekaninaite) from granitic pegmatites are often strongly to completely altered to a fine- or coarse-grained mixture of muscovite, chlorite and/or, biotite, along with several less common secondary minerals, including mainly paragonite, tourmaline, and secondary beryl. The mixture is a common product of early subsolidus hydrothermal alteration at the examined pegmatites of the beryl-columbite subtype – Věžná I and Drahonín (Moldanubian Zone, Czech Republic) and Mount Begbie (Shuswap Complex, Canada); of the beryl-columbite-phosphate subtype – Szklary (Góry Sowie Block, Poland); and of miarolitic intragranitic pegmatites – Zimnik (Massif Strzegom-Sobótka, Poland). We studied in detail (EPMA, LA-ICP-MS) relics of primary cordierite/sekaninaite: Věžná I (Crd77–72Sek27–22MnCrd2–1, Be = 0.39–0.25 apfu, Li = 0.06–0.04 apfu), Drahonín (Crd13–9Sek74–71MnCrd17–16, Be = 0.24–0.18 apfu, Li = 0.07–0.05 apfu), Szklary (Crd50–49Sek30–26MnCrd25–21, Be = 0.45–0.41 apfu, Li ≤ 0.02 apfu), Mount Begbie (Crd34–33Sek53–43MnCrd24–14, Be = 0.33–0.29 apfu, Li = 0.26–0.23 apfu), and Zimnik (Crd2–1Sek75–71MnCrd28–23, Be = 0.25–0.15 apfu, Li = 0.18–0.12 apfu). Secondary beryl has a similar Mg/(Mg+Fe) ratio to its cordierite/sekaninaite precursor but is Mn depleted. The mineral assemblages and textures of the pseudomorphs were examined with a focus on secondary beryl, which forms anhedral grains to subhedral elongated crystals, up to 0.3 mm in size, or aggregates of these in textural equilibrium with associated phyllosilicates and tourmaline. Tourmaline is known from Věžná I, Drahonín, Mount Begbie, and Zimnik, the last also with topaz and “zinnwaldite” (a mineral with chemical composition between siderophyllite and polylithionite). Secondary beryl in pseudomorphs after cordierite/sekaninaite from granitic pegmatites and more evolved granites may have been often overlooked; hence, we present its textures and morphology so that it can be recognized during routine EPMA study and to study the source of elevated concentrations of Be in primary cordierite/sekaninaite. The empirical limit of detection of secondary beryl in pseudomorphs is ∼500–1000 ppm Be, which corresponds to ∼1–2 vol.% of secondary beryl. The chemical composition of the secondary beryl and other minerals indicate that the fluids responsible for the alteration were exsolved from the residual pegmatite melt and were not contaminated by fluids from the host rocks.
ER  -

GADAS, Petr; Milan NOVÁK; Michaela VAŠINOVÁ GALIOVÁ; Adam SZUSZKIEWICZ; Adam PIECZKA; Jakub HAIFLER a Jan CEMPÍREK. Secondary beryl in cordierite/sekaninaite pseudomorphs from granitic pegmatites – A monitor of elevated content of beryllium in the precursor. \textit{Canadian Mineralogist}. Mineralogical Association of Canada, 2020, roč.~58, č.~6, s.~785-802. ISSN~0008-4476. Dostupné z: https://doi.org/10.3749/canmin.2000014.

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