Very complex structures and characteristics of khondalite series were caused by poly phases of metamorphism and deformation.
由于多期强烈的变形变质作用，区内孔兹岩系的地层结构十分复杂。
2
The investigation of the khondalite sequence and its position in the stratum system of Archean in Daqingshan region is very useful to study the high-grade region of adjacent areas.