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@article{1875462,
author = {Kříbek, Bohdan and Knésl, Ilja and Dobeš, Petr and Veselovský, František and Pořádek, Přemysl and Škoda, Radek and Čopjaková, Renata and Leichmann, Jaromír and Košek, Filip},
article_number = {6},
doi = {http://dx.doi.org/10.3390/min12060690},
keywords = {synchysite; silica gel; uranium mineralization; the Rožná uranium deposit; rare earth elements},
language = {eng},
issn = {2075-163X},
journal = {Minerals},
title = {The Origin of Synchysite-(Ce) and Sources of Rare Earth Elements in the Rožná Uranium Deposit, Czech Republic},
url = {https://www.mdpi.com/2075-163X/12/6/690},
volume = {12},
year = {2022}
}
TY - JOUR
ID - 1875462
AU - Kříbek, Bohdan - Knésl, Ilja - Dobeš, Petr - Veselovský, František - Pořádek, Přemysl - Škoda, Radek - Čopjaková, Renata - Leichmann, Jaromír - Košek, Filip
PY - 2022
TI - The Origin of Synchysite-(Ce) and Sources of Rare Earth Elements in the Rožná Uranium Deposit, Czech Republic
JF - Minerals
VL - 12
IS - 6
SP - 1-26
EP - 1-26
PB - MDPI
SN - 2075163X
KW - synchysite
KW - silica gel
KW - uranium mineralization
KW - the Rožná uranium deposit
KW - rare earth elements
UR - https://www.mdpi.com/2075-163X/12/6/690
N2 - Synchysite was identified in the Rožná uranium deposit in a quartz–carbonate–sulfide vein, which is a part of the late (post-uranium and, post-Variscan) stage of the development of the hydrothermal system. The synchysite forms needles or lamellae, which are almost exclusively bound to the quartz filling of the veins. The structure of the quartz vein-filling, i.e., the preserved tubular syneresis crack pattern, Liesegang bands formed by hematite, chaotic grain size distribution of quartz grains, and ribbons of fibrous SiO2 grains, indicate that the synchysite crystallized in a silica gel. Its formation may be explained by the reaction of hydrothermal acid fluids rich in Fe2+ and rare earth elements (REEs) with alkaline Ca2+ HCO3− and F-rich fluids expelled from the gel during syneresis, or by its ageing. The subsequent recrystallization of the gel to form euhedral quartz grains was accompanied by the deformation of previously formed Liesegang rings, and the development of quartz rosettes. The study of fluid inclusions indicated that the silica gel originated at a very low temperature. The temperatures of the homogenization of two-phase inclusions in carbonate and quartz vein-filling varied between 38 and 74 °C, and the salinity ranged between 4 and 10 wt.% NaCl equiv. The δ13C carbonate values (from −4.65 to −5.21‰, PDB) indicate the deep-seated source of CO2, and δ18O values (from 14.76 to 18.22‰, SMOW) show that the source of the hydrothermal fluids was mainly surface water, with a possible admixture of fossil saline brines. The main sources of REEs are thought to have predominantly been uranium minerals (coffinitized uraninite and coffinite) that form a part of the breccia fragments embedded in the vein filling. The results illustrate the significant mobility of REEs in the late, low-temperature hydrothermal system, and they indicate the multiple remobilizations of REEs in the uranium deposits in general.
ER -
KŘÍBEK, Bohdan, Ilja KNÉSL, Petr DOBEŠ, František VESELOVSKÝ, Přemysl POŘÁDEK, Radek ŠKODA, Renata ČOPJAKOVÁ, Jaromír LEICHMANN a Filip KOŠEK. The Origin of Synchysite-(Ce) and Sources of Rare Earth Elements in the Rožná Uranium Deposit, Czech Republic. \textit{Minerals}. MDPI, 2022, roč.~12, č.~6, s.~1-26. ISSN~2075-163X. Dostupné z: https://dx.doi.org/10.3390/min12060690.
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