1. College of Earth Sciences, Jilin University, Changchun 130061, China;
2. Key laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Land and Resources, Changchun 130061, China;
3. Qinghai Third Geological Exploration Institute, Xining 810029, China

New zircon U-Pb dating is undertaken and geochemical characteristics, petrogenesis and tectonic significance are discussed in this study for Qunli syenogranite from the eastern Kunlun. LA-ICP-MS zircon U-Pb dating suggests that the age of Qunli syenogranite is 376.2 Ma (MSWD=0.25), belonging to Late Devonian. The petrogeochemical composition shows that it belongs to high potassium calc-alkaline, quasi-aluminous-weak peraluminous granite. The syenogranite is characterized by high SiO₂ (74.61%~77.85%),high alkali (Na₂O+K₂O=7.03%~7.94%), high FeO^T/MgO (FeO^T/MgO=11.39~36.93), low CaO (0.50%~1.01%) and MgO (0.06%~0.20% contents. Moreover, the syenogranite is characterized by a "sea-gull" REE pattern and strong negative Eu anomaly (��Eu=0.08~0.09), high gallium content(Ga=22.86×10^-6~27.06×10^-6), enrichment of high field strength element combination (Zr+Ce+Nb+Y=720×10^-6~891×10^-6), and strong depletion of Ba,Sr,P,Nb,Ta and Ti. Meanwhile the rock mass has high zircon saturation temperature (991��~1 201��). Comprehensive petrogeochemistry characteristics indicate that Qunli syenogranite belongs to A₂ type granite. Integrating regional research results, it is suggested that Qunli syenogranite was formed in the extensional tectonic setting after the closure of the Proto-Tethys Ocean. This result extends the extensional limit after the closure of the Proto-Tethys Ocean from the Middle Devonian to Late Devonian.