Metamorphic and tectonic evolutions of eclogites and associated metamorphic rocks in the Lake Zone, SW Mongolia

Abstract

The eclogite-bearing Alag Khadny metamorphic complex in the Lake Zone, SW Mongolia located in the central part of the Central Asian Orogenic Belt (CAOB), consists mainly of orthogneisses with large bodies of eclogites. Orthogneisses interleave with marbles which containing lenses of garnet-chloritoid schistsand and eclogite. Sometimes, vein-type orthogneisses developed in large eclogite bodies. Four metamorphic events [M1 (amphibolite facies), M2 (blueschist to eclogite facies) M3 (epidote-amphibolite facies) and M4 (amphibolite facies)] distinguished based on mineral assembalges developed in the eclogite bodies.