The eclogite-bearing Alag Khadny metamorphic complex in the Lake Zone, SW Mongolia located in the central part of the Central Asian Orogenic Belt, consist mainly of orthogneisses which interleaving with marbles including lenses of garnet-chloritoid schists. Eclogites have two modes of occurrence, i.e. lenses and boudins in orthogneisses (eclogite 1) and those in marbles (eclogite 2).