Some post-equilibrium reactions in kimberlite-derived eclogites Paper A-00081

Eclogites from the Chicundo (Angola) and Lace (S. Africa) kimberlites have been subject to post-equilibrium heating and/or decrease in pressure. These effects, and attendant metasomatism, are here interpreted as taking place during entrainment and transport in the host kimberlites. Phases formed during arrested retrograde reactions include corundum, orthopyroxene and K-feldspar which have previously been reported as uncommon, but well-equilibrated, phases in eclogites.