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Stages of the Paleoproterozoic Chemical Remagnetization of the Kivakka Layered Intrusion and Its Geodynamic Setting during the Breakup of the Precambrian Supercontinentsстатья
Статья опубликована в журнале из списка Web of Science и/или Scopus
- Авторы: Lubnina N.V., Bychkov A.Yu, Tarasov N.A., Osadchii V.O., Miklyaeva E.P.
- Журнал: Moscow University Geology Bulletin
- Том: 80
- Номер: 1
- Год издания: 2025
- Издательство: Allerton Press Inc.
- Местоположение издательства: United States
- Первая страница: 17
- Последняя страница: 27
- DOI: 10.3103/S0145875225700127
- Аннотация: Detailed paleomagnetic studies of rocks of the Kivakka layered intrusion and doleritic dikes areconducted. Four metachronous magnetization components are recognized. The hightemperature/highcoercitive component, which is distinguished in rocks of the Kivakka layered intrusion, formed during its crystallization at 2.45 Ga. Three metachronous magnetization components formed as a result of influence of hydrothermal fluids at different evolution stages of the Kivakka pluton at 2.05, 1.98, and 1.88 Ga. The comparison of secondary components of various ages for the Kivakka and Burakovka layered intrusions, as wellas the Paleoproterozoic mafic dikes of the Paanayarva structure, showed that the Kivakka pluton was inclined most likely during the formation of the Laplandian–Kola orogen between 2.05 and 1.98 Ga rather than during the intrusion as was suggested before. Thermodynamic modeling of the formation of hydrothermal mineral assemblages of rocks of the Kivakka layered intrusion showed that a serpentinite + magnetite assemblage with minor chlorite and actinolite always forms under hydrothermal influence on olivinite. It is established that the formation of secondary magnetite is typical only of sulfate-free NaCl fluids. An increase in the NaCl content increases the amount of magnetite, which corresponds to our experimental results.
- Добавил в систему: Лубнина Наталия Валерьевна