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Generation of Tholeiitic Magmas in the Interaction Zone of Evolving Ridge, Fracture Zone, and Plume: Evidence from Basalts in 332B Hole, DSDP Leg 37, North Atlanticстатья
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: 8 декабря 2021 г.
- Авторы: Sushchevskaya N.M., Dubinin E.P., Shcherbakov V.D., Belyatsky B.V., Zhilkina A.V.
- Журнал: Geochemistry International
- Том: 59
- Номер: 10
- Год издания: 2021
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 903
- Последняя страница: 921
- DOI: 10.1134/S0016702921090068
- Аннотация: New petrogeochemical data (lithophile element contents and Sr, Nd and Pb isotope composition) on basalts recovered in the DSDP hole 332B in the 37°N region showed that the generation area of deep tholeiites 3 Ma experienced impact of the Azores plume. This led to the formation of tholeiites weakly enriched in a component compositionally similar to the enriched basalts of the Azores. In turn, sources of basaltic melts of the Azores Archipelago resemble those of enriched alkaline magmas of the Iberian margin, which were formed through melting of continental lithospheric fragments of Eurasia. Two types of olivines with different trace element fractionation trends (Ni, Co, Ca) were identified for the first time in the tholeiites from the DSDP hole 332B at the Azores Triple Junction (ATJ). The compositions of olivines with an elevated Ni content are close to those of the basalts of the Azores Archipelago and indicate the presence of lithospheric mantle fragments in the area of tholeiitic magma generation. The observed global and local compositional mantle heterogeneities could have arisen from the complex geodynamic evolution of the ATJ, the formation of which was accompanied by the impact of the Azores plume near fracture zone, spreading axis jumping, and the involvement of continental lithospheric fragments in melting.
- Добавил в систему: Дубинин Евгений Павлович