Seminar

Cratons cover a large area of the continent crust. As one of the oldest cratons in the world, the North China Craton (NCC) records a lot of information about metamorphic and tectonic evolution history. Zhao et al. (1998, 2012) divided the North China Craton into three main parts, the Eastern Block, the Western Block and the Trans North China Orogen in between them. These two blocks are metamorphic basement of 2.5 Ga, while the TNCO is an orogenic belt because of the collision event between the Eastern Block and the Western Block at 1.8 Ga. The geological background of Paleoproterozoic of the NCC has been well established. However, there are still some controversies about the Neoarchean tectonic background of the NCC.

The research area is Chengde an Pingquan, where is located in the northern part of the North China Craton. According to Zhao’s division scheme, the Chengde area belongs to the Trans North China Orogen, while the Pingquan area belongs to the Eastern Block. Mafic granulite, felsic granulite and amphibolite were collected from Chengde area. These metamorphic rocks recorded metamorphic age of ~ 1.8 Ga. Metamorphic rocks with white-eye socket texture and red-eye socket texture were collected from the Pingquan area. Granulite with white-eye socket texture of the Pingquan area recorded metamorphic age of ~ 1.8 Ga.