ISOTOPIC EVIDENCE FOR POSTSEDIMENTARY TRANSFORMATION OF ROCKS OF THE LOWER CAMBRIAN ANGARA FORMATION IN THE IRKUTSK AMPHITHEATER

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dc.contributor.author Vinogradov V.I.
dc.contributor.author Bujakaite M.I.
dc.contributor.author Golovin D.I.
dc.contributor.author Kuleshov V.N.
dc.contributor.author Minaeva M.A.
dc.contributor.author Belenitskaya G.A.
dc.date.accessioned 2024-12-22T03:47:48Z
dc.date.available 2024-12-22T03:47:48Z
dc.date.issued 2006
dc.identifier https://www.elibrary.ru/item.asp?id=13514541
dc.identifier.citation Lithology and Mineral Resources, 2006, 41, 6, 588-600
dc.identifier.issn 0024-4902
dc.identifier.uri https://repository.geologyscience.ru/handle/123456789/47040
dc.description.abstract The section of the Angara Formation (upper portion of Lower Cambrian) is composed of a complex combination of dolomites, anhydrites, marlstones, and salinastones. The occurrence of solution breccia, various types of metasomatism, and other indications testify to the substantial postsedimentary reworking of these rocks. Sulfate reduction, one of the most important processes of reworking, is clearly expressed in the sulfur isotopic composition. The 87Sr/86Sr ratio in carbonate and sulfate materials is more stable owing to the relatively high Sr content in these rocks. Nevertheless, most sulfate and carbonate rocks are contaminated with the radiogenic Sr. The carbon isotope ratio in carbonates is close to the "normal" value despite the evaporitic character of sedimentation basins and the possible participation of organic carbon, which is a product of the oxidation of hydrocarbons by sulfates, in the transformation of carbonates. The Rb-Sr analysis of the clayey component of marlstones and the K-Ar analysis of mudstones from the lower portion of the Lower Cambrian-Vendian section indicate that the rocks were mainly transformed during a time span corresponding to the Caledonian folding dramatically manifested at the platform margin. © Pleiades Publishing, Inc. 2006.
dc.subject Cambrian
dc.subject Vendian
dc.title ISOTOPIC EVIDENCE FOR POSTSEDIMENTARY TRANSFORMATION OF ROCKS OF THE LOWER CAMBRIAN ANGARA FORMATION IN THE IRKUTSK AMPHITHEATER
dc.type Статья
dc.identifier.doi 10.1134/S0024490206060071
dc.subject.age Paleozoic::Cambrian
dc.subject.age Палеозой::Кембрийская
dc.subject.age Precambrian::Proterozoic::Neoproterozoic::Vendian
dc.subject.age Докембрий::Протерозой::Неопротерозойская::Вендский


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