摘要
Heilongjiang complex, along the Mudanjiang fault in the western part of the Jiamusi massif, was due to the collision between the Jiamusi and Songnen massifs. The complex is composed predominately of strongly deformed mylonites with a large number of masses or slices of ultrabasite, blueschist, metasilicatite and marble in varied sizes and deformation. The relationships of metamorphism and deformation between undeformed masses and deformed mylonites indicate the Heilongjiang complex was at least subjected to two phase metamorophism of early high-pressure metamorphism and late lower P/T metamorphism associated by ductile deformation. This event is prevalently recorded in Heilongjiang complex in Jiayin, Yilan and Mudanjiang areas, indicating that the entire Heilongjiang complex experienced a major tectonic exhumation in the Early-Middle Jurassic.