The Mesoproterozoic mantle plume beneath the northern part of the Siberian craton
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The study of the Mesoproterozoic (1473 ± 24 Ma) dolerites of the Olenek uplift of the Siberian craton basement has shown their petrologic and geochemical similarity to typical OIB produced with participation of a mantle plume. The dolerites are characterized by variations in the geochemical composition explained by different degrees of melting of the same source. A conclusion is drawn that the parental melts of the rocks were slightly modified by crustal contamination, as evidenced from their Nd isotope composition (£Nd(T) = +0.6 to -0.8) and the presence of inherited zircons of four ages (2564, 2111, 2053, and 1865 Ma). Since the Siberian craton in the structure of the Nuna supercontinent (Columbia) was located relatively close to the Baltic continent and the Congo and Sao Francisco cratons, we assume that the Early Mesoproterozoic mafic intrusions (1500-1470 Ma) of all these cratons belong to the same large igneous province (LIP). The province formation was related to the activity of superplume (or mantle hot field), which supplied mantle matter to the lithosphere basement. The superplume core was probably located beneath the northern part of the Siberian craton, where basites are compositionally most similar to the primary mantle source.
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Paleoproterozoic formation age for the Siberian cratonic mantle: Hf and Nd isotope data on refractory peridotite xenoliths from the Udachnaya kimberliteDoucet, Luc-Serge; Ionov, D.; Golovin, A. (2015)© 2014 Elsevier B.V. The formation age of the Siberian cratonic mantle is not well established as yet. Re-Os data on various mantle-derived materials have shown that it contains Archaean components, but the reported ...
High water contents in the Siberian cratonic mantle linked to metasomatism: An FTIR study of Udachnaya peridotite xenolithsDoucet, Luc-Serge; Peslier, A.; Ionov, D.; Brandon, A.; Golovin, A.; Goncharov, A.; Ashchepkov, I. (2014)The processes that control water distribution in nominally anhydrous minerals from peridotites are twofold. Melt depletion will remove water while metasomatism can potentially add water to these minerals. These processes ...
Olivine inclusions in Siberian diamonds and mantle xenoliths: Contrasting water and trace-element contentsJean, M.; Taylor, L.; Howarth, G.; Peslier, A.; Fedele, L.; Bodnar, R.; Guan, Y.; Doucet, Luc-Serge; Ionov, D.; Logvinova, A.; Golovin, A.; Sobolev, N. (2016)ï¿½ 2016 Elsevier B.V. A subject of continuing debate is how the Earth's lithospheric portion of the upper mantle has remained the thickest ( > ï¿½200ï¿½km) and oldest ( > ï¿½3ï¿½Gy) beneath cratons and is yet surrounded ...