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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2024. Vol 49

Geochemical Characteristics of Upper Proterozoic and Paleozoic Terrigenous Deposits in Their Contact Zone (Southern Timan)

Author(s)
N. Yu. Nikulova, O. V. Grakova
Abstract
The distribution patterns of rare earth, trace elements and rock-forming oxides in sandstones of the Upper Riphean Dzhezhimskii Formation and Middle-Upper Devonian Asyvvozhskii Formation of the basement/cover contact zone on the Dzhezhimparma Upland (Southern Timan) are studied. It is shown that the Riphean and Devonian sandstones are similar in the distribution patterns of rare earth and trace elements, the content of which in all studied rock varieties is significantly lower than PAAS. A common feature of the Riphean and Devonian sandstones is the predominance of light REE. It is established that the accumulation of both Riphean and Devonian sandstones took place in an epicontinental setting under hot climate conditions due to erosion and redeposition of metamorphic basement formations and, to a lesser extent, weakly weathered acidic igneous rocks. The minor variation in trace element contents indicates the constancy of the sources of detrital material, the main role among which was played by ancient metasedimentary rocks. The conducted studies and the previously obtained results of U–Pb isotope dating of detrital zircon grains from the Asyvvozhskii Formation sandstones allow us to assume that the main sources of detrital zircons for both Riphean and Devonian sandstones were crystalline complexes of the ancient basement of the East European Platform and complexes of accretionary orogens on the margin of Baltica. It is possible that Devonian sandstones could have partially inherited the composition of Riphean deposits. The obtained results can be used as criteria for correlating spatially isolated sections, determining the facies affiliation and paleotectonic conditions of sedimentation.
About the Authors

Nikulova Natalia Yuryevna, Doctor of Science (Geology and Mineralogy), Leading Research Scientist, Institute of Geology Komi Scientific Center UB RAS, 54, Pervomayskaya st., Syktyvkar, 167982, Russian Federation, e-mail: nikulova@geo.komisc.ru

Grakova Oksana Vasilyevna, Candidate of Science (Geology and Mineralogy), Research Scientist, Institute of Geology Komi Scientific Center UB RAS, 54, Pervomayskaya st., Syktyvkar, 167982, Russian Federation, e-mail: ovgrakova@geo.komisc.ru

For citation

Nikulova N.Yu., Grakova O.V. Geochemical Characteristics of Upper Proterozoic and Paleozoic Terrigenous Deposits in Their Contact Zone (Southern Timan). The Bulletin of Irkutsk State University. Series Earth Sciences, 2024, vol. 49, pp. 104-117. https://doi.org/10.26516/2073-3402.2024.49.104 (in Russian)

Keywords
sandstones, chemical composition, sedimentation conditions, Riphean, Devonian, South Timan.
UDC
550.42(234.83)
DOI
https://doi.org/10.26516/2073-3402.2024.49.104
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