Stepanyuk L.M.1, Bondarenko S.N.1, Somka V. A.1, Kotvitskaja I.N.1, Andreev A.V.2
1. M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine
2. Taras Shevchenko National University of Kyiv
Language: Ukrainian
Geochemistry and ore formation 2012, 31-32: 99-104
https://doi.org/10.15407/gof.2012.31.099
Investigations of rubidium-strontium isotopic system in subsequent series of metasomatic alterations (granite – barren albitite – mineralized albitite) from granites of Novoukrainka type to uraniferous albitites are carried out. Isotopic systems of bulk rock samples, apatite and plagioclases from rocks of Dokuchaevka deposit as well as apatite from Novoukrainka granites of Kapustjansky open pit are studied. The tendency of lowering the values of primary isotopic relation 87Sr/86Sr from nonaltered granite (0,725) to barren albitites (0,7121–0,7146) and subsuquently to mineralised albitites (0,7108–0,7088) is established. At the same time undirect logarithmic relation between values of primary 87Sr/86Sr ratio in albitites and uranium contents in them is observed, as well as direct linear relation between uranium contents in albitites and albites from them, that testify for common migration of uranium, sodium and strontium.
The conclusion about absence of anу genetic relation between granites of Novoukrainka type and metasomatic fluids which have caused formation of albitites as well as deep nature of their source are made.
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