CYCLOSTRATIGRAPHIC ESTIMATE OF THE DURATION OF THE NEGATIVE δ 13 C ANOMALY OF THE ZHUA GROUP (SHURAM-WONOKA EVENT) IN THE VENDIAN REFERENCE SECTION IN SOUTH OF THE SIBERIAN PLATFORM

D. V. Rudko; Рудько Д. В.; S. V. Rudko; Рудько С. В.; A. V. Shatsillo; Шацилло А. В.; I. V. Latysheva; Латышева И. В.; A. V. Kolesnikov; Колесников А. В.; I. V. Fedyukin; Федюкин И. В.; B. G. Pokrovsky; Покровский Б. Г.

doi:10.31857/S2686739723600492

CYCLOSTRATIGRAPHIC ESTIMATE OF THE DURATION OF THE NEGATIVE δ¹³C ANOMALY OF THE ZHUA GROUP (SHURAM-WONOKA EVENT) IN THE VENDIAN REFERENCE SECTION IN SOUTH OF THE SIBERIAN PLATFORM

Authors: Rudko D.V.¹, Rudko S.V.², Shatsillo A.V.³, Latysheva I.V.², Kolesnikov A.V.², Fedyukin I.V.³, Pokrovsky B.G.²
Affiliations:
1. The Institute of Earth Sciences, The Hebrew University of Jerusalem
2. Institute of Physics of the Earth, Russian Academy of Sciences
3. Geological Institute, Russian Academy of Sciences
Issue: Vol 513, No 1 (2023)
Pages: 53-59
Section: СТРАТИГРАФИЯ
URL: https://journals.rcsi.science/2686-7397/article/view/232972
DOI: https://doi.org/10.31857/S2686739723600492
EDN: https://elibrary.ru/KYUMCZ
ID: 232972

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Abstract

A cyclostratigraphic study of the Late Precambrian Zhuya Group (Nikolskoye and Chencha Formations) and Torgo formation in the south of the Siberian Platform was carried out to determine the duration of the C-isotope anomaly imprinted in them. The similarity of the ratios of the period lengths of the cyclic components of the magnetic susceptibility in the coeval deposits of the remote sections of the Nikol’skoye and Torgo Fms. indicates the connection between the revealed cyclicity and the basin-scale environment changes. According to the obtained astrochronological model, the duration of the formation of the studied intervals of the Nikol’skoye (57 m) and Chencha (147 m) formations was 850 and 2500 ky, respectively. Extrapolation of the data obtained shows that the duration of the C-isotope anomaly of the Zhuya Group in the Vendian reference section of the on the Ura uplift was about 10 My, which is consistent with most estimates of the Shuram anomaly’s duration and its stratigraphic analogues.

Keywords

astrochronology, Siberian Platform, magnetic susceptibility, Shuram carbon isotope anomaly, Zhuya Group, Ediacaran

References

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