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Sampling focused mainly on the episyenites and partly altered two-mica granites of the southern part of the Okrouhla Radoun uranium deposit.
In some cases, the most strongly albitized episyenites contain also microscopic druses of epitaxy-crystallized albite IV.
These later generations of chlorite are very rare in episyenites originated by alteration of two-mica granites of the Destna type due to the small amount of magmatic biotite.
Carbonates fill vugs formed during leaching of magmatic quartz and/or form lenses and veins along smaller faults in episyenites (Fig.
COMPOSITION OF HYDROTHERMALLY ALTERED GRANITES AND EPISYENITES
The origin of episyenites is, due to the dissolution of K-feldspar, connected with a depletion in rubidium and sometimes also with the evolution of a prominent negative europium anomaly (Eu/Eu* = 0.
The hydrothermal alteration of granites and the origin of episyenites in the southern part of the Okrouhla Radoun uranium deposit were accompanied by significant loss of silica, usually also by a loss of potassium.
2] is also characteristic for episyenites from the Western European uranium deposits (Cathelineau, 1987; Dubessy et al.
The origin of episyenites at the Okrouhla Radoun uranium deposit was accompanied by changes in the distribution of REE.
The origin of hydrothermal mineralization connected with the formation of episyenites in two-mica granites of the Okrouhla Radoun uranium deposit was a relatively long-lasting process.