Fractionation of iron stable isotopes
by bacterial oxidation Fe2 + in
low-temperature ferruterous
sources of various genesis
Dubinina G. A (1), Sorokina A.J. (1),
 Gapeeva M. V (gmv@ibiw.yaroslavl.ru) (2), Dolotov A.V. (3),

(1) Institution of the Russian Academy of Sciences Institute of microbiology
of S.N.Vinogradsky of the Russian Academy of Sciences
(2) Institution of the Russian Academy of Sciences Institute of biology of internal waters
of I.D.Papanina
(3) Ivanovo state university

The comparative estimation microbiological and abiogenous  kinetics of oxidising processes, as well as their contribution to transformation of structure of stable isotopes of iron 56Fe and 54Fe in low-temperature mineral ferruginous  “ Marsial water” (Southern Kareliya) springs and in light- salt  spring of Staraya Russa “ (Novgorod region) resort was carried out. In a series of modelling experiments influence of initial concentration of iron and an oxygen mode was investigated on speed of oxidizing processes and transformation of isotope structure generated iron oxide with use of samples of natural water in situ. Isotope structure Fe was defined in the mineral ferruginous springs which differed on a chemical compound of waters and genesis. The structure of the microorganisms participating in reactions of oxidising branch biogeochemical cycle of iron was established. The prevailing role of the microbiological (biogene) factor in differentiation of isotope structure of  iron oxidized deposits   was shown.