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The tectonic convergence between the South China block and Qinling belt that occurred
in Mesozoic time was not homogeneous along strike; it was mainly concentrated in the
Shengnongjia and Hannan domes, which formed a pair of indentors, along which the
South China block penetrated the Qinling belt. As a consequence, the Tongbai–Dabie Shan
belt, the eastern part of the Qinling orogenic belt, may have undergone large-scale eastward
extrusion, clockwise rotation, and uplift, as indicated by its boundary deformation
features. It was originally located beneath the narrowest part of the Qinling belt, where
it underwent ultrahigh-pressure metamorphism in the Early Triassic.