The recent progress in the project of the geological survey and data renewal in the Sichuan-Chongqing-Guizhou-Yunnan zone, southwestern China

Stratigraphically, the recent progress includes the discovery of the marine Jurassic strata, fossils and fossil assemblages in western Sichuan. The deposition in the South China Neoproterozoic rift basin was initiated posterior to ca. 820 Ma. The amphibian fossils Labyrinthodontias are recognized in the Middle Permian strata in the Gaoligongshan area. Tectonically, There occurs a giant ductile shear zone at the northeastern boundary of the Xianshuihe fault. The regional decollement structural zone appears on the central Guizhou oldland. Petrologically, the Rb-Sr isochron age of 214±1 Ma for the Romeke volcanic rocks and 244±1 Ma for the Xiaoshitoushan granites in the Songpan-Garze zone indicate a similar age for both the Aba magmatic zone and Barkam magmatic zone. The basic volcanic rocks are recognized at the base of the Neoproterozoic Xiajiang Group.