Newly described eclogites from the Neldy Formation, Makbal district, Northern Tien-Shan, Kyrgyzstan

Abstract

Eclogites occurring in the Neldy Formation of the Makbal district in the Kyrgyz Northern Tien-Shan are newly described. The metamorphism of the eclogites is divided into two events, a precursor metamorphic event and a subsequent eclogitic metamorphic event. The metamorphic conditions of the precursor event are represented by the amphibolite facies. The peak metamorphic conditions of the eclogitic event are estimated to be T = 550-610 C and P = 22-25 kbars. The prograde, peak and retrograde metamorphic conditions define a hairpin-type clockwise P-T path for the Neldy eclogites.