Geologicheskii Vestnik

For the fi rst time, a detailed isotope-geochemical study of carbonate deposits in the section of the Upper Ordovician reef Bol’shaya Kos’yu (Northern Urals) was undertaken, which was situated in the late Ordovician time within the Southern Equatorial latitudes. The isotopic composition of carbon in the studied rocks varies within –0.29...1.89‰, and oxygen — +24.16...+29.86‰. The variational curves δ13CPDB and δ18OSMOW are constructed. The below-clarke contents of Sr and the above-clarke content of Ba were revealed. The results obtained show that the nature of the change in the ratio of carbon and oxygen isotopes is in a good agreement with the revealed trend of changes in the conditions of sedimentation. The reef ecosystem was formed during the transgression, which ended by the end of the middle Katian time with a major regression that stopped its development. Changes in the content of Sr, Ba carbonates, oxygen and carbon isotopes, as well as variations in the lithological composition of rocks were infl uenced by regional and global geological processes: the rate of submersion of the basin, tectonic movements of the basement blocks, the rate of transgression. Ultimately, these processes led to fl uctuations in sea level, salinity, and changed the volume of living space, thus regulating the composition, size, and structure of bottom communities.

carbonate rocks, δ13C and δ18O, Ba, Sr, reef, Upper Ordovician, Ilych River, Northern Urals

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