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Russian Geology and Geophysics

2015 year, number 11

EVIDENCE FOR GLOBAL FAMENNIAN AND TOURNAISIAN GEOLOGIC EVENTS IN THE SECTION OF AN ISOLATED CARBONATE PLATFORM IN THE EASTERN URALS

G.A. Mizens, V.N. Kuleshov, T.I. Stepanova, N.A. Kucheva
Keywords: Isolated carbonate platform, carbon and oxygen isotopes, geologic events, Urals

Abstract

The composition of stable carbon and oxygen isotopes in the section of an isolated carbonate platform is analyzed. Traces of several global and subglobal transgressions and regressions have been found in the limestone strata. Some of these phenomena were associated with the Upper Kellwasser (at the Frasnian–Famennian boundary) and multiphase Hangenberg (at the Devonian–Carboniferous boundary) Events. Never-theless, there were no considerable sea level fluctuations in the platform water area. There is no evidence for subaerial erosion. The bottom water during sedimentation was mostly in oxic conditions.