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Radiation-induced oxidation of iron in the ocean of the early Earthстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 17 ноября 2021 г.
- Автор: Ershov Boris G.
- Журнал: Precambrian Research
- Том: 364
- Год издания: 2021
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 106360
- DOI: 10.1016/j.precamres.2021.106360
- Аннотация: Radiation-chemical mechanism of bivalent iron oxidation in the World Ocean is suggested and substantiated. The decay of primordial radioactive isotopes 40K, 235U, 238U, and 232Th, present on the Earth since the moment of its formation (4.5 Ga), initiated the water radiolysis with the generation of ionic and radical species (eaq–, •H, •OH) and formation of molecular products (H2O2 and H2). The mechanism of the radiation-chemical oxidation of Fe2+ in the World Ocean depending on pH and the presence of oxygen is considered. The Fe(III) hydrolysis is responsible for the iron transfer from the freely dissolved state in the ocean into the solid phase. Low solubility of the hydroxide favors the formation of insoluble oxides, magnetite and hematite. The calculations reveal the decisive role of 40K in the radiation-induced oxidation. The process occurred throughout the volume of the World Ocean with the efficiency corresponding to the solubility of potassium salts in it. Quantitative estimation shows that, in the period from 4.3 to 2.5 Ga, i.e., before the occurrence of the Great Oxidation Event, about ~1021 g of iron could be oxidized by the radiation chemical mechanism.
- Добавил в систему: Ершов Борис Григорьевич
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