New explanation of detachment structures in the Burang and Gyironggou regions,southern Xizang

The detachment structures are well developed in the Burang and Gyironggou regions, southern Xizang. The major decollement surface lies between the Nyalam Group Complex at the base and Rouqiecun Group and Rongsha Formation on the top. However local segments are occupied by the Miocene adamellite. These detachment structures have recorded multiphase tectonic activities during the Miocene and even from the Palaeozoic to the Mesozoic, especially during the Early Carboniferous, Early Permian, Early Triassic, Late Triassic and Early Jurassic.