The 238U/235U Ratio as an Indicator of Redox Conditions in the Ediacaran Paleobasin (Sequence of the Chaya River, Baikal–Patom Highland, Southern Part of Central Siberia)
- Авторлар: Chugaev A.V.1, Chernyshev I.V.1, Pokrovsky B.G.2, Mandzhieva G.V.1, Gareev B.I.3, Sadasyuk A.S.1, Batalin G.A.3
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Мекемелер:
- Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academy of Sciences
- Geological Institute, Russian Academy of Sciences
- Kazan (Volga Region) Federal University
- Шығарылым: Том 485, № 1 (2019)
- Беттер: 336-340
- Бөлім: Geochemistry
- URL: https://ogarev-online.ru/1028-334X/article/view/194753
- DOI: https://doi.org/10.1134/S1028334X19030280
- ID: 194753
Дәйексөз келтіру
Аннотация
Abstract—This article is devoted to a study of variations in the U isotopic composition (238U/235U) in the section of clastic–carbonate Ediacaran sediments exposed along the Chaya River in the southern part of Central Siberia (Russia). Measurements of 238U/235U in the rocks were performed using a high-precision (±0.07, 2SD) MC-ICP-MS with a 233U–236U double isotope spike. The total variation range of δ238U in the studied carbonate rocks was −0.91 to −0.01‰. Extremely low values of δ238U (−0.91‰, −0.9‰, and −0.84‰), which were found in a number of samples from the lower part of the section, are interpreted as the result of postsedimentation processes affecting the rocks. In the overlying sediments, the range of δ238U variations is smaller from −0.49 to −0.01‰. Here, regular “weighting” of the U isotopic composition observed upwards through the section indicates an increase in the reduction conditions at this time (about 550 Ma) in the paleobasin. This conclusion is consistent with the elevated concentrations of U, Mo, and V in the Late Ediacaran sedimentary rocks of the region studied.
Авторлар туралы
A. Chugaev
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academyof Sciences
Хат алмасуға жауапты Автор.
Email: vassachav@mail.ru
Ресей, Moscow, 119017
I. Chernyshev
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academyof Sciences
Email: vassachav@mail.ru
Ресей, Moscow, 119017
B. Pokrovsky
Geological Institute, Russian Academy of Sciences
Email: vassachav@mail.ru
Ресей,
Moscow, 119017
G. Mandzhieva
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academyof Sciences
Email: vassachav@mail.ru
Ресей, Moscow, 119017
B. Gareev
Kazan (Volga Region) Federal University
Email: vassachav@mail.ru
Ресей, Kazan
A. Sadasyuk
Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM), Russian Academyof Sciences
Email: vassachav@mail.ru
Ресей, Moscow, 119017
G. Batalin
Kazan (Volga Region) Federal University
Email: vassachav@mail.ru
Ресей, Kazan
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