Late Mesozoic extensional tectonics in the North China Craton and its adjacent regions: a review and synthesis

ABSTRACT

The late Mesozoic tectonics of the North China Craton (NCC) and its adjacent regions were characterized by a general lithospheric extension and remarked by extensional dome structures, such as the metamorphic core complexes, syn-tectonic plutons, rolling-hinge structures, and widespreadgraben/half graben basins. According to our own field observations, laboratory work, and previous results of other groups, from north to south, five extensional domains have been delineated, namely Transbaikalia–Mongol–Okhotsk, western part of NCC, eastern part of NCC and Korea, Qinling–Dabie and its neighbouring, and the interior of South China Block, respectively. As the largest crustal scale extensional tectonic realm in the world, these domains are featured by a NW–SE extensional direction with strong extensional exhumation of middle to lower crust rocks to the surface along detachment faults. Geochronological work on these ductile detachment faults constrain a narrow activity period around 130 Ma except several extensive structures along the Tan–Lu fault, which documents a relative longer extensional period. The foundering of the lower part of the lithosphere could be a possible mechanism of this continent-scale extensional tectonics. This geodynamic model could help us to enhance the knowledge of the time, scale, and mechanism of the NCC destruction from the view of structural analysis.

KEYWORDS:

• North China Craton and its adjacent regions
• late Mesozoic extensional tectonics
• metamorphic core complex
• lithospheric foundering

Acknowledgements

This work is supported by the National Key R&D Program of China: [Grant Numbers 2016YFC0600401 and 2016YFC0600102] and NSFC: [Grant Numbers 41502215 and 41472193]. Constructive comments on science and English by Prof. M. Faure, Y. Chen, R. J. Stern (Editor), Y. Dong, and another anonymous reviewer are deeply acknowledged.

Disclosure statement

No potential conflict of interest was reported by the author.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China: [Grant Numbers 41225009, 41472193, and 41502215]; National Key R&D Program of China: [Grant Numbers 2016YFC0600102 and 2016YFC0600401].