Shaerdelan metamorphic core complex, firstly discovered by the author, lies in file western Jueluotage tectonic belt of southeast of Junggar Plate. The inner core system of this complex are composed of mylonitized granites, plagioclase hornblendites, biotite granulites and so on. Aqishan Formation, Yamansu Formation and Tugutubulake Formation of Carbonferous, together with Qiatekeer Formation of Early Permain constitute decollement system. And Badaowan Formation of Early Jurassic constitutes covering strata system. The metamorphic core complex represents ellipsoidal in the plane, The decollement tectonic system is around the outside of the core dumping, and constitutes imbricate, shovel-like normal fault system. The strata suite of decollement system hits various degrees of thinning find loss. The mylonitized granites have geochemical character of A(2) sub-type granites, which form in within plate setting. The zircon U-Pb SHRIMP dating is 921.7 +/- 8.1 Ma, which stands for magma crystallization age. 746 similar to 721 Ma and 630 similar to 600 Ma may represent the time of mylonitization and hydrostatic crystallization age respectively. Plagioclase hornblendite and biotite granulite stratas may be formed in Mesoproterozoic Era. The occurrence of Shaerdelan metamorphic core complex suggests that Jueluotage tectonic belt (even Junggar Plate) occurs within crystalline basement in Presinian. The crystalline basements, together with folding basement in the northeast of Junggar plate, constitute the two-layered structure basement of Junggar Plate.
