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Mezoproterozoic basite magmatism of the Bashkirian meganticlinorium (Southern Urals): age constraints, petrological and geochemical featuresстатья
Статья опубликована в журнале из списка RSCI Web of Science
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 21 октября 2020 г.
- Авторы: Хотылев А.О., Тевелев А.В., Бычкова Я.В., Латышев А.В., Аносова М.Б.
- Журнал: Geodynamics & Tectonophysics
- Том: 11
- Номер: 2
- Год издания: 2020
- Издательство: Федеральное государственное бюджетное учреждение науки Институт земной коры Сибирского отделения РАН
- Местоположение издательства: Иркутск
- Первая страница: 219
- Последняя страница: 243
- DOI: 10.5800/GT-2020-11-2-0471
- Аннотация: Among the Riphean–Vendian dyke complexes of the basic composition, which intersect the Precambrianstrata of the Bashkirian meganticlinorium (Southern Urals), one of the most common is the Kurgas gabbro-doleritecomplex dated to the Early – Middle Riphean. This article presents the isotopic dating, petrological and geochemicalfeatures of the rocks belonging to the Kurgas complex. It gives the first description of the regional geochemical zoningthat is reflected in a decrease in SiO2 contents from the north to the south along the Bashkirian meganticlinorium, and anincrease in MgO contents in the same direction, which is attributed by the authors to an increase in the permeability ofthe crust to the south during opening of the Mashak riftogenic structure.New data on isotopic ages were obtained for the dyke that cuts the Satka formation of the Lower Riphean – 1318±10(40Ar/39Ar), the intrusion in the exocontact zone of the Berdyaush rapakivi granite massif – 1349±11 Ma (U-Pb), and theandesite dyke among the metamorphic rocks of the Taratash complex – 1365.6±6.6 Ma (U-Pb). These ages, in combinationwith the previously obtained data, suggest that the complex formed during a rather long period of time (from 1385 to1318 Ma, as a minimum), which corresponds to the beginning of the Middle Riphean. Isotopic U-Pb age of the dyke thatcuts the contact zone of the Berdyaush massif, suggests that the major portion of the massif had already crystallized bythat time and was exhumed into the shallow zone of brittle deformation.
- Добавил в систему: Хотылев Алексей Олегович