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[Mantle eclogites make up an important component in mantle xenolith suites and are transported to the surface by kimberlite magmas; diamondiferous eclogites represent one of the main diamond reservoirs on Earth. Although peridotitic xenoliths are dominant in kimberlites and P-type diamonds are more abundant than E-type, recovered diamondiferous eclogite xenoliths are significantly more abundant world-wide than are diamondiferous peridotites and are present in all industrial kimberlite deposits of the Yakutian province (Kostrovizky et al., 2015). Despite the relative rarity of eclogitic xenoliths sampled by kimberlites, they offer key constraints on the formation of thickened Archean cratonic lithosphere, as well as the extent of modification resulting from interaction with melt or fluids in mantle environments and during kimberlite transport (e.g., Pearson et al., 2003). Studies of eclogites are important for refining models of global crust–mantle evolution and provide constraints on the origin of diamondiferous mantle as eclogites represent significant diamond reservoirs in some portions of SCLM of Siberian Craton (e.g., Spetsius et al., 2008). The late Devonian Komsomolskaya and Yubileynaya pipes are located in the center of the Yakutian province, within the Alakit-Marhinsky kimberlite field. The diamond grade of Yubileynaya kimberlites (0.90 ct/t) is higher than Komsomolskaya (0.36 ct/t) but the diamond value of the latter is twice as high. The aim of this study is to petrologically characterize the Yubileynaya and Komsomolskaya xenoliths and their diamonds in order to place robust constraints on the differences in origin of diamonds within the SCLM beneath these pipes. Examination of these diamondiferous eclogites can also have important implications for understanding of diamond genesis and lithosphere evolution within the Siberian Platform, in general. These xenoliths present the opportunity to investigate a unique collection of diamond-bearing xenoliths that will permit constraints on their source materials and on diamond-forming processes. Here, we present majorand trace-element data on garnet and clinopyroxene minerals along.

Petrogenetic evidence and FTIR constraints on the origin of diamonds in xenoliths from Yubileynaya and Komsomolskaya pipes, Yakutia