Thermochronological Constraint to the Processes of the East Kunlun and Adjacent Areas in Mesozoic-Early Cenozoic

This paper displays some new thermochronological data on the tectonic processes of the East Kunlun and its adjacent areas in Mesozoic-Early Cenozoic, which were less investigated before. Three thermal events are revealed by different thermochronological methods. The first thermal event, which was a regional tectonic thermal event and established regional tectonic framework, started-up at about 200Ma and lasted to the interim of the early-middle Jurassic. Its dynamics can be related to the closure of the Songpan-Ganzi-Bayan Har Triassic turbilite basin and the collision between the Qiangtang block and the Kumlun block. The second thermal event, mainly shows a series of NWW-SEE regional faults activity, occurred at about 130-150Ma and lasted to about 100Ma, the end of Early Cretaceous. The dynamics of this thermal event can be correspond to the collision between the Lhasa block and the Eurasia plate alone the Bangong-Nujiang suture zone. The last one happened at about 56-45Ma, showing a extension-coursed uplift. The thermochronological records match well to the geological records which fragmentaryrily presented in the study area and provide a more certain constraint to the tectonic processes.