Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.1134/S0024490222050029
Ключевые слова: dolomites, isotope geochemistry, manganese deposit, manganese ores, neoproterozoic, strontium, yenisei ridge
Аннотация: Abstract: Wide variations of 87Sr/86Sr (0.70825‒0.70924) have been established at the Porozhinsk deposit in manganese ores and carbonates ascribed to the Pod’’emsk Formation. These data, together with variations in the carbon (δ13C = –14.6…2.0‰, PDB) and oxygen (δ18О = 19.4…28.3‰, SMOW) isotope composition indicate different conditПоказать полностьюions of the formation of the studied rocks. The 87Sr/86Sr values in the studied dolomites of the Porozhinsk deposit are much higher than those of carbonate rocks (dolomites, limestones) of the Pod’’emsk Formation from the Chapa River section. The position of the 87Sr/86Sr values of dolomites from the Porozhinsk deposit on the secular 87Sr/86Sr variation curve for Late Proterozoic ocean (Kuznetsov et al., 2014) suggests that the carbonate rocks attributed to the Pod’’emsk Formation at the Porozhinsk deposit have younger age than carbonates of the Pod’’emsk Formation from the Chapa River section. The Mn/Sr values usually taken as a criterion for the degree of secondary alteration of carbonates (in interpreting 87Sr/86Sr variations and discussing the suitability of the material for chemostratigraphic constructions) are not suitable for rocks formed in manganese ore sedimentation basins. © 2022, Pleiades Publishing, Inc.
Журнал: Lithology and Mineral Resources
Выпуск журнала: Vol. 57, Is. 5
Номера страниц: 431-448
ISSN журнала: 00244902
Издатель: Pleiades journals