Regional and local magmatic anomalies and tectonics of rift zones between the Antarctic and South American Plates

Sushchewskaya, N.M.; Migdisova, N.A.; Dubinin, E.P.; Belyatsky, B.V.

Авторы: Sushchewskaya N.M., Migdisova N.A., Dubinin E.P., Belyatsky B.V.
Журнал: Geochemistry International
Том: 54
Номер: 6
Год издания: 2016
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 494
Последняя страница: 508
DOI: 10.1134/S00116702916050104
Аннотация: The study provides new understanding of magmatism at extinct and modern spreading zones around the western margin of East Antarctica from Bransfield Strait to the Bouvet Triple Junction (BTJ) in the Atlantic Ocean and reveals causes of geochemical heterogeneity of mantle magmatism during the early opening of the Southern Ocean. The results indicate the involvement of an enriched source component in the generation of parental melts, which was formed in several tectonic stages. The enriched (metasomatized) mantle generated at rift zones has geochemical characteristics typical of the western Gondwana lithosphere (with isotopic compositions similar to those inferred for the enriched HIMU and EM-2 sources). This mantle source may have been produced by the thermal erosion of the continental mantle during the early stages of the Karoo–Maud–Ferrar superplume activity. This enriched mantle generated in the apical parts of the plume (sub-oceanic) began to melt during tectonic displacement and fragmentation of Gondwana. The Bouvet Triple Junction, located along modern spreading zones between the Antarctic and South American plate, is characterized by a greater depth of melting and a higher degree of enrichment of primary tholeiitic magmas. The highest enrichment of magmas in this region is controlled by a contribution from a pyroxenite-rich component, which was also identified in the extinct spreading center in Powell Basin.
Добавил в систему: Дубинин Евгений Павлович

	ИСТИНА	Войти в систему Регистрация
	Интеллектуальная Система Тематического Исследования НАукометрических данных
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

Интеллектуальная Система Тематического Исследования НАукометрических данных

Regional and local magmatic anomalies and tectonics of rift zones between the Antarctic and South American Platesстатья

Прикрепленные файлы