Traces of the global Ludford Lau event in a section of the Silurian Sizim horizon on the western slope of the Subpolar Urals

T. M. Beznosova; V. A. Matveev

doi:10.24930/2500-302X-2026-26-1-122-143

Traces of the global Ludford Lau event in a section of the Silurian Sizim horizon on the western slope of the Subpolar Urals

T. M. Beznosova, V. A. Matveev

https://doi.org/10.24930/2500-302X-2026-26-1-122-143

EDN: JGCJVQ

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Abstract

Research subject. To present new results obtained when studying clayey-carbonate deposits of the Sizim Regional Stage of the Upper Ludlow in the Silurian reference section on the western slope of the Subpolar Urals.

Materials and methods. Representative collections of sedimentary rock samples with fossil fauna collected by the authors from Upper Silurian deposits in different years during fieldwork on the western slope of the Subpolar Urals, the Chernov and Chernyshev Uplifts, as well as new C-isotope data, were used.

Results. For the first time, a biostratigraphically dated interval with positive δ¹³C values marking the Middle Ludford Lau isotope event in the Upper Ludlow section of the Subpolar Urals has been distinguished. The isotope curve has a stepped structure and records a distinct positive trend. The previously determined positive isotope excursion of the Early Pridolian Klev Event at the base of the Belush’ya Regional Stage of the Pridoli marks the boundary of the Ludlow and Pridoli in the same section of the Subpolar Urals.

Conclusions. The conducted integral study of successive changes in facies, biota composition, and behavior of stable carbon isotopes in the Sizim Regional Stage section on the western slope of the Subpolar Urals made it possible to identify the manifestations of the global biotic and isotopic Middle Ludford Lau Event.

Keywords

Ludlow, Upper Silurian, conodonts, brachiopods, carbon isotopes

About the Authors

T. M. Beznosova

N.P. Yushkin Institute of Geology, FRC Komi SC UB RAS
Russian Federation

Tat’yana M. Beznosova

54 Pervomaiskaya st., Syktyvkar 167982

V. A. Matveev

N.P. Yushkin Institute of Geology, FRC Komi SC UB RAS
Russian Federation

Vladimir A. Matveev

54 Pervomaiskaya st., Syktyvkar 167982

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Review

For citations:

Beznosova T.M., Matveev V.A. Traces of the global Ludford Lau event in a section of the Silurian Sizim horizon on the western slope of the Subpolar Urals. LITHOSPHERE (Russia). 2026;26(1):122-143. (In Russ.) https://doi.org/10.24930/2500-302X-2026-26-1-122-143. EDN: JGCJVQ

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