Tectonic evolution of Dingqing-Bitu segment of Bangonghu-Nujiang suture zone in Qinghai-Tibet Plateau, China

Dingqing-Bitu segment is located at the turning point where the extension of Bangonghu-Nujiang suture zone turns from EW direction to NS direction, and it is located between Gangdisi-Chaou landmass of Gondwana and Changdu-Simao landmass of Huaxia Yangtze continent thus has experienced strong extension, extrusion, collision, rapid settlement and uplifting, therefore it belongs to orogenic belt with very complicated geological structures and variable depositional tectonic setting. There is a high-pressure metamorphic belt developed and the relative magmatic activities is quite intensive and frequent in this suture zone. Dingqing-Bitu-Nujiang ocean basin has experienced a ratively complete Wilson Cycle that includes the initial development and evolution of rift-initial ocean basin stage, oceanic spreading stage, oceanic subduction stage and closure-collision stage.