EGU25-4915, updated on 14 Mar 2025
https://doi.org/10.5194/egusphere-egu25-4915
EGU General Assembly 2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Oral | Monday, 28 Apr, 11:50–12:00 (CEST)
 
Room K1
North China Archean dome-and-basin structures; arc plutons, superimposed folds, or sagduction?
Lu Wang, Ruizhi Wang, Wenbin Ning, and Timothy M. Kusky
Lu Wang et al.
  • State Key Lab of Geological Processes and Mineral Resources, and Center for Global Tectonics, School of Earth Sciences, China University of Geoscience, WuhanChina (wanglu@cug.edu.cn)

Archean dome-and-basin structures are widely interpreted to have formed in a stagnant-lid drip-tectonic or sagduction setting, unlike modern Earth. In the North China Craton, apparent dome-and-basin structures in eastern gneiss terrains are bordered by a contemporaneous 1800 km-long orogenic belt, exhibiting many classical hallmark indicators of plate boundary interactions found in Phanerozoic orogens, suggesting contrarily that plate tectonics was operating during formation of the domes. We solve this dilemma by showing that the domes-and-basins formed by a combination of fold interference, temporally constrained by felsic intrusion events, and folding of domal arc-related plutons. Strong deformation is related to overthrusting of nappes from the adjacent orogen, forming klippen, infolded with the gneisses, explaining the perplexing juxtaposition of plate tectonic and seemingly non-plate tectonic terrains so closely in space and time.

How to cite: Wang, L., Wang, R., Ning, W., and Kusky, T. M.: North China Archean dome-and-basin structures; arc plutons, superimposed folds, or sagduction?, EGU General Assembly 2025, Vienna, Austria, 27 Apr–2 May 2025, EGU25-4915, https://doi.org/10.5194/egusphere-egu25-4915, 2025.