Paleoproterozoic Igneous And Metamorphic Activities In The Jiao-Liao-Ji Belt, North China Craton, And Its Tectonic Implications: A Review

The Jiao-Liao-Ji Belt (JLJB) is a Paleoproterozoic collisional belt between the Longgang Block in the eastern North China Craton and the Nangrim Massif in the Korean Peninsula. Paleoproterozoic igneous and metamorphic activities are widely distributed in the JLJB. In this paper, we reviewed previous studies on sedimentation, igneous activity, and metamorphism in the JLJB and discussed the tectonic evolution of the JLJB. Previous studies reported that there was a sedimentary deposition in the JUR during 2.21-1.92 Ga. However, it is still uncertain whether the sedimentation occurred in a Rifling or a back-arc basin tectonic environment. In this paper, the sedimentation in the JLJB was considered to occur in the back-arc basin tectonic setting based on 2.19-2.08 Ga igneous activities occurred in the back-arc basin tectonic setting in the JLJB. Along the southern margin of the JLJB, 1.87-1.84 Ga igneous activities were reported. It is also under argument whether the igneous activities occurred in the rifting or post-collision tectonic setting. In the JLJB, the intermediate-P/T type metamorphism occurred due to collision along the JLJB during similar to 1.95-1.90 Ga and then low-P/T type metamorphism occurred during 1.89-1.84 Ga. Based on the metamorphic information, we considered that 1.87-1.84 Ga igneous activity occurred in the post collisional tectonic setting. Based on these and other information, we suggested that the JLJB experienced (southward) arc-related subduction during 2.2-2.1 Ga and continent-continent collision during similar to 1.95 -1.90 Ga. The collision may have first occurred in the Jinan area and then propagated to the Jiaobei area. After continental collision, postcollisional extension occurred with related igneous and metamorphic activities during 1.89-1.84 Ga.