Abstract:

The Hongqiyingzi Group occurred in the ChongliChicheng area, northern margin of the North China craton, was composed of metamorphic supracrustal rocks, Late Paleozoic dioriticquartzdioritic gneisses and the remnants of PaleoproterozoicNeoarchean rocks. The SHRIMP and LAICPMS zircon UPb dating for the Hongqiyingzi metamorphic supracrustal rocks shows that the samples not only contain a large number of the zircon reflecting the PaleoproterozoicNeoarchean and MesoproterozoicLate Paleozoic age information, but also record multiple metamorphic events during the late PaleozoicEarly Mesozoic. The zircon dating result reveals that the Hongqiyingzi Group wasn’t formed in the Paleoproterozoic, but a suite of Late Paleozoic metamorphic complex. The zircon UPb dating for the plutons distributed in the surrounding of the Hongqiyingzi Group indicated the correlation between the Late PaleozoicEarly Mesozoic magmatism and metamorphism, which are related with the multistage subductionsynorogenicpostorogenic events of Central Asian Orogenic Belt. Because the Hongqiyingzi complex contains some Late Paleozoic retrograde eclogites and the metamorphic peridotites (harzburgite) occurring as lenticular enclave in highly deformed gneisses, this may mean that the Northern Hebei Block had separated from the North China Craton in the early stage of the late Paleozoic, and reamalgamated accompanied by the Central Asian Orogene. The Hongqiyingzi complex represent the subductioncollision amalgamating zone between the Nothern Hebei Block and the North China Craton during the late Paleozoic.

Key words: ChongliChicheng area, Hongqiyingzi Group, zircon UPb dating, Late Paleozoic, metamorphic complex