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WAN Shaokai 1,2, XIA Bin1 and ZHANG Yuquan1 (1. CAS Key Laboratory of Marginal Sea Geology and Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, GD 510640, China; 2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China)  
Laojunshan syenite lies in the south segment of the Cenozoic potassic alkaline magmatic rock in Ailaoshan-Jinshajiang river. The SHRIMP zircon U-Pb dating results of Laojunshan Syenite are 34.8±1.6Ma(2σ),MSWD=0.38(probability= 0.96), which is consistant with the Oligocene epoch, belonging to Himalayas period. We will discuss its formation age of rocks and the cause formation of zircon by the SHRIMP zircon U-Pb analytical results of Laojunshan Syenite.
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