Major element oxides, trace element content and isotopic ratios of dolerites from the Schirmacher Oasis ...

• Main Authors: Sushchevskaya, Nadezhda M, Belyatsky, Boris V, Leichenkov, G L, Laiba, Anatoly A
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2009
• Subjects: Multiple investigations; Archive of Ocean Data ARCOD; Antarc*; Antarctica; DML; Dronning Maud Land
• Online Access: https://dx.doi.org/10.1594/pangaea.792752; https://doi.pangaea.de/10.1594/PANGAEA.792752

New results on the petrochemistry and geochemistry of dolerites from the Schirmacher Oasis shed light on the development of the Karoo-Maud plume in Antarctica. The basalts and dolerites are petrologically identical to the rocks of western Dronning Maud Land (DML), which were previously studied and interpreted as a manifestation of the Karoo-Maud plume in Antarctica. The spatial distribution of the dikes suggests eastward spreading of the plume material, up to the Schirmacher Oasis for at least 10 Ma. The geochemical characteristics of magmas from the Schirmacher Oasis reflect the influence of crustal contamination, which accompanied both the ascent and spreading of the plume. The magmas of the initial stage of plume activity (western DML) appeared to be the most contaminated in crustal components.It was found that the geochemical characteristics of Mesozoic magmas from the Schirmacher Oasis are identical to those of enriched tholeiites from the Afanasy Nikitin Rise and the central Kerguelen Plateau (Hole ... : Supplement to: Sushchevskaya, Nadezhda M; Belyatsky, Boris V; Leichenkov, G L; Laiba, Anatoly A (2009): Evolution of the Karoo-Maud mantle plume in Antarctica and its influence on the magmatism of the early stages of Indian Ocean opening. 47(1), 1-17 ...