The First Find of Spinel Peridotite in the Southern Kazakhstan: Structure, Composition, and Parameters of High-Pressure Metamorphism

摘要

Spinel peridotite, metamorphosed in high-pressure conditions, was first described within the Western part of the Central Asian Orogenic Belt. The spinel peridotite has the characteristics of Mg-Cr ultramafites indicating the mantle origin of its protolith. The preliminary estimation of the metamorphism peak for the model system MgO-Al2O3-SiO2-Cr2O3 (MASCr) is 10-19 kbar at 680-800 degrees C.