Collision Leading to Multiple-Stage Large-Scale Extrusion in the Qinling Orogen: Insights from the Mianlue Suture ⁎ Sanzhong Li A, , Timothy M
http://www.paper.edu.cn Gondwana Research 12 (2007) 121–143 Collision leading to multiple-stage large-scale extrusion in the Qinling orogen: Insights from the Mianlue suture ⁎ Sanzhong Li a, , Timothy M. Kusky b, Lu Wang c, Guowei Zhang d, Shaocong Lai d, Xiaochun Liu e, Shuwen Dong e, Guochun Zhao f a Department of Marine Geology, College of Marine Geoscience, Ocean University of China, No. 238, Songling Road, 266100, Qingdao, China b Department of Earth and Atmospheric Sciences, St. Louis University, 3507 Laclede Avenue, St. Louis, MO 63103, USA c College of Marine Geoscience, Ocean University of China, Qingdao, China d Department of Geology, Northwest University, Xi'an, China e Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, China f Department of Earth Science, The University of Hong Kong, Hong Kong, China Received 1 March 2006; received in revised form 13 November 2006; accepted 13 November 2006 Available online 16 December 2006 Abstract The geologic framework of the Phanerozoic Qinling–Dabie orogen was built up through two major suturing events of three blocks. From north to south these include the North China craton (including the north Qinling block), the Qinling–Dabie microblock, and the South China craton (including the Bikou block), separated by the Shangdan and Mianlue sutures. The Mianlue suture zone contains evidence for Mesozoic extrusion tectonics in the form of major strike–slip border faults surrounding basement blocks, a Late Paleozoic ophiolite and a ca. 240–200 Ma thrust belt that reformed by 200–150 Ma thrusts during A-type (intracontinental) subduction. The regional map pattern shows that the blocks are surrounded by complexly deformed Devonian to Early Triassic metasandstones and metapelites, forming a regional-scale block-in-matrix mélange fabric.
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