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Mesozoic large-scale lateral extrusion, rotation, and uplift of the Tongbai–Dabie Shan belt in east China

¹ Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100029, China, and Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
² Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
³ Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
⁴ Department of Geology, Northwestern University, Xi'an 100069, China

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.

Key Words: Tongbai–Dabie Shan belt • extrusion • rotation • uplift • indentation

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