Specific Features of Carbonate Platform Formation: Evidence from the Middle Carboniferous East Ural Gulf |
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| Authors: | Chuvashov B I Anfimov A L |
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| Institution: | (1) Institute of Geology and Geochemistry, Ural Division, Russian Academy of Sciences, Pochtovyi per. 7, Yekaterinburg, 620151, Russia |
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| Abstract: | During the Moscovian Age, the eastern part of the Russian Platform was occupied by the shallow-water East European Basin (EEB) characterized by predominantly carbonate sedimentation. In the Cis-Ural region of this basin, the deep Cis-Ural Sea (CUS) occupied the Ural Foredeep. The Paleo-Ural Range separated the CUS from the narrow and long East Ural Gulf, which was connected in the south with the main part of the EEB and a sea within the Turan Plate. The Moscovian paleogeographic setting is shown in three paleogeographic maps. Middle Carboniferous organogenic buildups from the eastern slope of the Urals have been time and again described previously. However, the repeated study of these features did not prove the biogenic nature of all of them. This work presents characteristics of two, newly discovered, unique (in terms of nature and structure) coastal bioherms. One bioherm lies at the base of the Moscovian stage and consists of phylloid algae. The second bioherm, located at a higher level, has a complex structure and is made up of foraminifers, algae, and stromatolites. After the desiccation and development of karst features on the surface, the bioherm was buried under sandy–clayey sediments accumulated in freshened water. |
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