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Roots of a Collapsed Paleoproterozoic Island Arc in the Volga−Don Ocean, East Sarmatian Composite Terrane: Geochemistry, Age, and Petrogenesisстатья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 марта 2026 г.
- Авторы: Savko K.A., Samsonov A.V., Goncharov D.A., Terentiev R.A., Larionov A.N., Korish E.Kh
- Журнал: Petrology
- Том: 34
- Номер: 1
- Год издания: 2026
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 19
- Последняя страница: 37
- DOI: 10.1134/S0869591125700328
- Аннотация: The Archean Varvarinsky block was distinguished in the southern Vorontsovka terrane of EasternSarmatia in the late 1960s. It was proved to consist of Paleoproterozoic I-type sodic diorites and granodioritesdated at 2.09 Ga. Isotopic and geochemical characteristics of its rocks (highly radiogenic Nd composition,enrichment in Cr and Ni, depletion in LILE, HFSE, and LREE, as well as low Sr/Y values) suggest theirisland-arc nature. The sources were aqueous melts from the mantle wedge, metasomatized by fluids duringthe melting of a subducted oceanic slab, followed by fractionation in intermediate chambers. The finds of themost ancient precollisional granitoid intrusions provide direct evidence that island arc structures occurred inthe Volga−Don Ocean and were composed of calc-alkaline volcanics of basalt−andesite−dacite−rhyolite(BADR) composition. They are the intrusive roots of the destroyed volcanic island arcs produced during thesubduction of oceanic slabs in the Volga−Don Ocean.
- Добавил в систему: Гончаров Денис Андреевич