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Stratigraphy and Geological Correlation

, Volume 26, Issue 6, pp 634–658 | Cite as

The Ludfordian Lau Event (Upper Silurian) in the Northeastern Regions of European Russia

  • A. I. AntoshkinaEmail author
Article

Abstract

The Ludfordian deposits of the boundary interval of the Gerd’yu and Greben’ superhorizons in the north of the western slope of the Urals and the Pre-Urals Foredeep corresponding to the mid-Ludfordian interval of the Lau Event are studied. The results were obtained using lithological, facies, paleontological, geochemical, spectroscopic, electron-microscopic, and isotopic chemostratigraphic methods. The Lau Event in the examined section is recognized by a distinct change in facies, by a change in zonal species in assemblages of brachiopods, vertebrates, and conodonts, and by climatic changes. The Subpolar Urals section includes a member of clayey-carbonate rocks with interbeds of carbonaceous shales, argillites, and clayey dolomites, reflecting a prominent Greben’ transgression that followed the variously pronounced erosion of a carbonate plate at the end of the Gerd’yu time and differentiation of back-reef relief of this platform. A positive excursion of the isotopic chemostratigraphic curves within the Lau Event interval is most pronounced in the sections of the Chernyshev and Chernov swells, where rocks are less strongly altered by secondary processes and δ13Ccarb is 4.6 and 6.2–7.4‰, respectively. A decline in the Homerian–early Ludfordian reefs right until the late Lochkovian was an important result of this event as it marked a cessation of the Late Ordovician–Silurian marginal shelf reef formation in the Urals.

Keywords:

Ludfordian Gerd’yu and Greben’ superhorizons depositional settings facies fossils δ13Ccarb and δ18Ocarb chemostratigraphy 

Notes

ACKNOWLEDGMENTS

I am grateful to the reviewers A.S. Alekseev, N.V. Sennikov, and T.Yu. Tolmacheva for useful recommendations during the preparation of the paper for publication.

The study was carried out within a framework of State Program no. AAAA-A17-117121270034-3 and was partly funded by the Program of Fundamental Study of the Ural Branch of the Russian Academy of Sciences, project no. 18-5-5-31.

Reviewers A.S. Alekseev, N.V. Sennikov, and T.Yu. Tolmacheva

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© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  1. 1.Institute of Geology, Komi Research Center, Ural Branch, Russian Academy of SciencesSyktyvkarRussia

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