Email this article Variations of the 238U/235U isotope ratio in metasedimentary rocks and evidence of changes in sedimentation conditions during the Ediacaran period of the Neoproterozoic
- Authors: Chugaev A.V.1, Chernyshev I.V.1, Budyak A.E.2, Mandzhieva G.V.1, Sadasyuk A.S.1, Gareev B.I.3
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Affiliations:
- Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
- Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
- Kazan Federal University
- Issue: Vol 484, No 4 (2019)
- Pages: 472-477
- Section: Geochemistry
- URL: https://journals.eco-vector.com/0869-5652/article/view/12564
- DOI: https://doi.org/10.31857/S0869-56524844472-477
- ID: 12564
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Abstract
The isotopic composition of uranium is a new geochemical indicator that facilitates reconstruction of the redox conditions of geological processes. In this paper the results of study of the 238U/235U isotope ratio in the Neoproterozoic metasedimentary rocks of the Baikal–Patom fold belt (Northern Transbaikalia) were obtained using the MC-ICP-MS method and 233U+236U double spike. The scale of 238U/235U ratio variations (δ238U = –0.37 to –0.11‰) is within the range of (–0.39 to +0.15‰), typical of metasedimentary terrigenous rocks of marine origin. In terms of the δ238U values, uranium of the BPB rocks studied is heavier than seawater uranium (δ238U = –0.41 ± 0.03). There is a correlation between the δ238U value in the rocks and their position in the stratigraphic section. Variations of the 238U/235U ratio in the terrigenous-carbonate sequences of BPB indicate that the sedimentation conditions changed and euxinic conditions were established in the course of evolution of the paleobasin in the Late Ediacarian Period.
About the authors
A. V. Chugaev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Author for correspondence.
Email: chug@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
I. V. Chernyshev
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: chug@igem.ru
Academician of the RAS
Russian Federation, 35, Staromonetny, Moscow, 119017A. E. Budyak
Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences
Email: chug@igem.ru
Russian Federation, PBox 9, 1a, Favorsky street, Irkutsk, 664033
G. V. Mandzhieva
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: chug@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
A. S. Sadasyuk
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences
Email: chug@igem.ru
Russian Federation, 35, Staromonetny, Moscow, 119017
B. I. Gareev
Kazan Federal University
Email: chug@igem.ru
Russian Federation, 18, Kremliovskaya street, Kazan, 420008
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