Post-Archean formation of the lithospheric mantle in the central Siberian craton: Re–Os and PGE study of peridotite xenoliths from the Udachnaya kimberlite

The age and history of the lithospheric mantle of the Siberian craton: Re–Os and PGE study of peridotite xenoliths from the Obnazhennaya kimberlite

“…As inferred in the previous section, the data from this study as well as some past work Ionov et al, 2015;Pearson et al, 1995aPearson et al, , 1995b suggest a combination of Archean (≥2.8 Ga) and Paleoproterozoic (∼2 Ga) formation events for the mantle lithosphere of the Siberian craton. These data for mantlederived rocks are compared in Fig.…”

“…1), bin size is 0.25 Ga. (b) Relative probability density plots for refractory (Al 2 O 3 <2%; Mg# >0.90) Obnazhennaya peridotites in this study and for garnet (dashed grey line) and spinel (continuous grey line) refractory peridotites from Udachnaya (central Siberian craton) afterIonov et al (2015). The ∼2 Ga peaks coincide in the two sites, but only Obnazhennaya has an Archean peak.…”

“…Further, the zircons from granulite xenoliths from Udachnaya (viewed as representative of the lower continental crust) were formed mainly around 1.8-1.9 Ga (Koreshkova et al, 2009), i.e. are coeval with the melt extraction ages for Udachnaya and some Obnazhennaya peridotites Ionov et al, 2015). Some zircons from the Anabar shield yield older ages of 2.0-3.6 Ga with a peak at ∼ 3.0 Ga, which are roughly coeval with the Archean peridotite xenoliths from Obnazhennaya reported in this work.…”

Palaeoproterozoic Mafic magmatism in the Indian Shield: Petrologic, Geochemical and Thermal constraints on Proterozoic Mantle

“…Sub-continental lithospheric mantle (SCLM) is postulated as a potential enriched source for many continental basalts (McKenzie and O'Nions, 1995). The geochemically enriched component in the SCLM must be of metasomatic origin as evidenced by the presence of hydrous minerals (e.g., amphibole, phlogopite) and vein lithologies (e.g., garnet pyroxenite, pyroxenite and hornblendite) and the idea gained wider acceptance based on mantle xenolith data (Frey and Green, 1974;Frey et al, 1978;Menzies and Murthy, 1980;Menzies, 1983;Menzies and Hawkesworth, 1987;O'Reilly and Griffin, 1988;Takazawa et al, 2000;Agashev et al, 2013;Hughes et al, 2014;Kuku³a et al, 2015;Ionov et al, 2015;Puziewicz et al 2015 and many others) and massif peridotites (Frey et al, 1985;Pilet et al, 2005). Although, the involvement of metasomatized SCLM is accepted, the mechanism of metasomatism in the SCLM that is, how the metasomatized materials enter source regions is not clearly known.…”

Melts and fluids evolution in the process of crust and mantle formation in Paleo-Proterozoic (2,2—1,75 Ga ago). Stratigraphy and magnetic activity

“…берлитовыми расплавами из мантии и коры, показывает, что образование литосферы всех кратонов мира имело длительную историю, но во всех слу-чаях включает этап 2,1-1,7 млрд лет [Condie, 2011;Ionov et al, 2015;Liu et al, 2016 и др.]. Это время является и пиком карбонатитового вулканизма на всех щитах планеты [Когарко, 2005;Condie, 2011].…”