Enriched upper mantle and eclogitic lower crust in north Qiangtang, Qinghai-Tibet Plateau: petrological and geochemical evidence from the Cenozoic volcanic rocks
青藏高原北羌塘榴辉岩质下地质及富集型地幔源区——来自新生代火山岩的岩石地球化学证据

Using the petrological and geochemical method, the Cenozoic volcanic rocks collected from north Qiangtang, Qinghai Tibet plateau were dealt with in this paper. The research results indicate that the Tertiary volcanic rocks can be devided into two different associations: alkaline (shoshonitic) series and high potassium calc alkaline series. They originated from a special inhomogeneously enriched upper mantle and a eclogitic lower crust, respectively. It shows that the north part of Qinghai Tibet plateau develops a enriched mantle source and a eclogitic lower crust in Cenozoic period at the specific tectonic setting of plates collision. This recognization is significant for further discussions about the uplift mechanism and continental dynamics of the Qinghai Tibet plateau.