Geochemical Indicators of the Carbonate Sedimentation Depositional Environments and Geodynamic Conditions in the East of the Middle Urals in the Kizelovian Time

Abstract

Geochemical characteristics of the limestones of Kizelovskian substage of the Eastern Urals zone (Rezh River, Middle Urals), such as carbon and oxygen isotopic composition, concentration of minor and trace elements, and redox value indicators, were studied in details. Based on the results of data interpretation and analysis of lithological features, it was assumed that carbonate deposits formed in shallow oxygen-rich environment with high bioproductivity warm water ecosystem, and within the isolated carbonate platform with a steady sinking territory. Some signs indicate that sedimentation during the Kizelovian time occurred in the inner lagoon of a large atoll. The Maldivian archipelago could be a contemporary analogue of the Rezhevskaya carbonate platform.

Keywords

• Средний Урал
• нижний карбон
• карбонатная платформа
• малые элементы
• изотопы углерода и кислорода
• обстановки осадконакопления