Importance of Ca-rich fluids for the formation of secondary
Sc-minerals. An example from a metaluminous pegmatite
Kožichovice II, Czech Republic

J 2024

Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic

VÝRAVSKÝ, Jakub; Radek ŠKODA a Milan NOVÁK

Základní údaje

Originální název

Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic

Autoři

VÝRAVSKÝ, Jakub (203 Česká republika, domácí); Radek ŠKODA (203 Česká republika, domácí) a Milan NOVÁK (203 Česká republika, domácí)

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/00216224:14310/24:00138981

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1180/mgm.2024.85

UT WoS

001422877200001

EID Scopus

2-s2.0-86000431161

Klíčová slova anglicky

scandium; metasomatic replacement; scandium minerals; granitic pegmatite; Ca-rich fluids; T & rcaron;eb & iacute;& ccaron; Pluton; Moldanubicum

Štítky

rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 31. 3. 2025 12:28, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

This work presents the results of an investigation of an assemblage of secondary Sc-minerals from the intraplutonic metaluminous pegmatite Kožichovice II, Třebíč Pluton, Czech Republic. The assemblage was formed by hydrothermally-induced dissolution of primary Sc-enriched (≈1.6 wt.% Sc2O3) columbite-(Mn) followed by in situ reprecipitation of volumetrically dominant fersmite (≈0.16 wt.% Sc2O3) and minor nioboheftetjernite (ScNbO4). Subsequent hydrothermal processes resulted in the formation of fluorcalciomicrolite + Sc-minerals (thortveitite + kristiansenite) + titanite. The mass balance calculations (based on EPMA-derived mineral compositions, mineral proportions obtained from TIMA automated mineralogy and textural observations) revealed that the amount of Sc released from the replaced mass of columbite-(Mn) is significantly higher than the amount of Sc incorporated in the mass of the secondary minerals. This indicates that part of the Sc was mobilised and released to the host rocks (pegmatite and granite). The secondary mineral assemblages indicate elevated Ca activity in the alteration fluids. Other occurrences of Sc-minerals in pegmatites (Baveno Pluton and Heftetjern pegmatite) show remarkable similarities in the paragenetic position of Sc-minerals (late hydrothermal/replacement minerals), including the high activity of Ca in fluids during their formation. The high activity of Ca in fluids during the metasomatic replacement of Sc-enriched precursors causes the formation of the volumetrically dominant Sc incompatible phases, followed by a local supersaturation of Sc resulting in the crystallisation of secondary Sc-minerals.

Návaznosti

EF16_026/0008459, projekt VaV

Název: Dlouhodobý výzkum geochemických bariér pro ukládání jaderného odpadu

Citovat

VÝRAVSKÝ, Jakub; Radek ŠKODA a Milan NOVÁK. Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic. Mineralogical Magazine. Cambridge University Press, 2024, roč. 88, č. 6, s. 787-803. ISSN 0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2024.85.

@article{2481580,
   author = {Výravský, Jakub and Škoda, Radek and Novák, Milan},
   article_number = {6},
   doi = {https://doi.org/10.1180/mgm.2024.85},
   keywords = {scandium; metasomatic replacement; scandium minerals; granitic pegmatite; Ca-rich fluids; T & rcaron;eb & iacute;& ccaron; Pluton; Moldanubicum},
   language = {eng},
   issn = {0026-461X},
   journal = {Mineralogical Magazine},
   title = {Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic},
   url = {https://doi.org/10.1180/mgm.2024.85},
   volume = {88},
   year = {2024}
}

TY  - JOUR
ID  - 2481580
AU  - Výravský, Jakub - Škoda, Radek - Novák, Milan
PY  - 2024
TI  - Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic
JF  - Mineralogical Magazine
VL  - 88
IS  - 6
SP  - 787-803
EP  - 787-803
PB  - Cambridge University Press
SN  - 0026461X
KW  - scandium
KW  - metasomatic replacement
KW  - scandium minerals
KW  - granitic pegmatite
KW  - Ca-rich fluids
KW  - T &
KW  - rcaron;eb &
KW  - iacute;&
KW  - ccaron
KW  - Pluton
KW  - Moldanubicum
UR  - https://doi.org/10.1180/mgm.2024.85
N2  - This work presents the results of an investigation of an assemblage of secondary Sc-minerals from the intraplutonic metaluminous pegmatite Kožichovice II, Třebíč Pluton, Czech Republic. The assemblage was formed by hydrothermally-induced dissolution of primary Sc-enriched (≈1.6 wt.% Sc2O3) columbite-(Mn) followed by in situ reprecipitation of volumetrically dominant fersmite (≈0.16 wt.% Sc2O3) and minor nioboheftetjernite (ScNbO4). Subsequent hydrothermal processes resulted in the formation of fluorcalciomicrolite + Sc-minerals (thortveitite + kristiansenite) + titanite. The mass balance calculations (based on EPMA-derived mineral compositions, mineral proportions obtained from TIMA automated mineralogy and textural observations) revealed that the amount of Sc released from the replaced mass of columbite-(Mn) is significantly higher than the amount of Sc incorporated in the mass of the secondary minerals. This indicates that part of the Sc was mobilised and released to the host rocks (pegmatite and granite). The secondary mineral assemblages indicate elevated Ca activity in the alteration fluids. Other occurrences of Sc-minerals in pegmatites (Baveno Pluton and Heftetjern pegmatite) show remarkable similarities in the paragenetic position of Sc-minerals (late hydrothermal/replacement minerals), including the high activity of Ca in fluids during their formation. The high activity of Ca in fluids during the metasomatic replacement of Sc-enriched precursors causes the formation of the volumetrically dominant Sc incompatible phases, followed by a local supersaturation of Sc resulting in the crystallisation of secondary Sc-minerals.
ER  -

VÝRAVSKÝ, Jakub; Radek ŠKODA a Milan NOVÁK. Importance of Ca-rich fluids for the formation of secondary Sc-minerals. An example from a metaluminous pegmatite Kožichovice II, Czech Republic. \textit{Mineralogical Magazine}. Cambridge University Press, 2024, roč.~88, č.~6, s.~787-803. ISSN~0026-461X. Dostupné z: https://doi.org/10.1180/mgm.2024.85.

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