Eclogitic clasts in a conglomerate bed overlying the Choloktor suite of HP metamorphic rocks in the Atbashy Range, Southern Tien-Shan Kyrgyzstan

Abstract

Non-metamorphosed conglomerate bed overlies the Choloktor suite which consists of pelitic schists, garnet-amphibolites and eclogites in the Atbashy area, Northern Tien-Shan, Kyrgyzstan, and it consists mainly of subrounded cobbles and boulders. The clasts include eclogites and garnet-amphibolites, and two events of HP metamorphism are distinguished in the eclogites. The first event consists of a prograde stage of the greenschist facies, the peak eclogitic stage of 460 - 590 °C at 15 kbar and a retrograde stage of the greenschist facies. The second event of metamorphism consists of the blueschist facies and the epidote-amphibolite facies of prograde stage and the greenschist facies of retrograde stage. The eclogite clasts from the conglomerate bed have a different P-T history from the eclogites of the Choloktor suite.