Tectonic evolution of the Triassic fold belts of Tibet

Francoise Roger (1) , Marc Jolivet (1) , Jacques Malavieille (1)

1 Géosciences Montpellier

The Triassic fold belt of North Tibet is mainly composed, from west to east, of the Bayan Har, Songpan-Garze, and Yidun (or Litang-Batang) terranes. The Indosinian orogeny results from interactions between the South China, North China and Qiangtang (North Tibet) blocks during the closure of the Palaeotethys. A synthesis of the tectonic and geochronological data available on this belt is presented and a new geodynamic model of its formation is proposed. At the end of the Permian, a synchronous activity along three subduction zones, Kunlun-Anyemaqen to the north, Jinsha to the south and Yushu-Batang to the east, induced the growth of wide accretionary orogens until the end of the Triassic period. The onset of subduction in Tibet is contemporaneous with Indosinian tectonism in Indochina (pre-Norian). However, the main tectonic events that lead to the closure of the Tethysian basin and the subsequent building of the Triassic belts are younger (220-200 Ma).

Mots clés: Indosinian orogeny; Triassic; North Tibet; geodynamic model; geochronology; subduction

Domaines: Tectonique; Milieux et Changements globaux

Francoise Roger, Marc Jolivet, Jacques Malavieille. Tectonic evolution of the Triassic fold belts of Tibet. Contributions to Mineralogy and Petrology, 2008, 340 (2-3), pp.180-189. ⟨10.1016/j.crte.2007.10.014⟩. ⟨hal-00411202⟩