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Mantle eclogites form an integral, in cases dominant, part of most kimberlite-borne xenolith suites. They have been variously interpreted as representing the metamorphosed equivalents of underplated high-pressure melts or of subducted oceanic crust (Jacob 2004). However, it has proven notoriously difficult to extract meaningful age information from the radiogenic isotope systematics of mantle eclogites. In addition, clinopyroxene (cpx), a major carrier of incompatible lithophile elements, including the parent elements of most commonly used radioactive decay systems, is frequently altered. This can preclude separation of enough pristine material for accurate and precise analysis by common mass spectrometric techniques and hinders efforts to unravel the origins and evolution of mantle eclogites and to link their formation to regional or global tectonothermal events.

Ages and sources of mantle eclogites: ID-TIMS U-Pb-Sr isotope systematics of clinopyroxene