Ordovician Sequence Stratigraphy of the Siberian and Russian Platforms

Dronov, Andrei

Abstract

The comparative analysis of the Ordovician successions of the Siberian and North American platforms demonstrates a striking similarity in the long-term lithological development and the sea-level curve interpretation. On both platforms, the Ordovician succession commences with tropical stromatolite-bearing carbonates, which abruptly change to siliciclastic deposits and the succession terminates with cool-water carbonates. Numerous K-bentonite beds in the Upper Ordovician of the North American and Siberian platforms emphasize this similarity even further. The sea-level curve for the Ordovician of the North American Platform assumes a prominent sea-level drop at the base of the Middle Ordovician and a long-term lowstand during the Dapingian and Darriwilian. The sea-level curve for the Ordovician of the Siberian Platform looks roughly the same. On the other hand, sea-level curves for the Ordovician of the Gondwanan platforms (North Africa, Yangtze Platform, Tarim, South America, Avalonia, and Baltica) seem to share different patterns. The Middle Ordovician represents there rather a highstand interval in these reconstructions. As a result, instead of one global sea-level curve for the Ordovician, it would be probably more reasonable to suggest two semi-global curves for two major tectonic regions: one of which includes the Siberian and the North American platforms and the other combines Baltica and the Gondwanan platforms. This subdivision probably reflects the position of the main Ordovician lithospheric plates.

Citation

Dronov, A. (2017). Ordovician Sequence Stratigraphy of the Siberian and Russian Platforms. In M. Montenari (Ed.), Stratigraphy & Timescales (187-241). Elsevier. https://doi.org/10.1016/bs.sats.2017.07.005

• Online Publication Date: Sep 6, 2017
• Publication Date: 2017
• Deposit Date: Jun 7, 2023
• Publisher: Elsevier
• Pages: 187-241
• Series Title: Advances in Sequence Stratigraphy
• Series ISSN: 2468-5178
• Book Title: Stratigraphy & Timescales
• Chapter Number: 5
• ISBN: 978-0-12-813077-3
• DOI: https://doi.org/10.1016/bs.sats.2017.07.005