Possible protoliths of the eclogites, garnet-talc-chloritoid schists and pelitic schists in the Makbal HP-UHP metamorphic complex, Northern Tien Shan, Kyrgyzstan

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The Makbal area consists of two contrasting metamorphic formations, i.e. the structurally lower Makbal Formation and the upper Neldy Formation. Quartzites are form the major constituent of the Makbal Formation, and pelitic schists are dominant in the Neldy Formation. These have been metamorphosed under high-pressure (HP) and ultrahigh-pressure (UHP) conditions: eclogites and associated pelitic schists underwent HP metamorphism (eclogite facies), whereas garnet-talc-chloritoid schists and quartzites metamorphosed under UHP conditions.Trace elements of the eclogites from the Makbal and the Neldy Formations and are plotted on the Zr-Nb-Y and Zr/Y-Zr discrimination diagrams (Meschede, 1986 and Pearce & Norry, 1979). Data show that most of the eclogites are the MORB and volcanic arc basalts, and a sample falls within within-plate and volcanic arc basalt.
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