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Eclogites are important component of lithospheric mantle beneath Archean cratons. They found as xenoliths in all kimberlites worldwide usually comprising minor (1-5%) part, but in some cases can dominate the xenoliths population. As the most of kimberlitic eclogites are Archean in age (Pearson et al, 1995: Jacob 2004) study of their composition is very useful tool to constrain the Archean geodynamics and cratons formation. Among the xenoliths population in kimberlites eclogites more often contain diamonds then other type of mantle rocks and hence could be the main diamond reservoir of the earth. Here we report the new results on eclogites from Siberian Udachnaya kimberlite pipe. A suite of 17 unique big (1 to 20 kg) and fresh eclogite xenoliths including two diamondiferous have been studied for their whole-rock and minerals major and trace elements composition.

Geochemistry of eclogite xenoliths from kimberlite pipe Udachnaya: section of Archean oceanic crust sampled?