1. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541004, Guangxi, China;
2. Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, Guangxi, China

The petrography, LA-ICP-MS zircon U-Pb chronology and geochemical analysis of inclusions in Nuodong pluton are studied to explore the genesis of Nuodong pluton and its inclusions in the Cenxi area of Guangxi Province. The results of petrographic study show that the rock inclusions of Nuodong pluton are mainly composed of porphyritic biotite feldspar granites, biotite plagiogneiss, biotite monzognesiss, fine-grained monzognesiss, k-feldspar granulite and granodiorite. The inclusions can be divided into xenolith and residual magma inclusions according to the petrogenesis. The zircon U-Pb dating results of the porphyritic biotite feldspar granites inclusions (Sample F16-7-6) and biotite plagiogneiss inclusions (Samples F16-13-4) by LA-ICP-MS are 152.3±2.2 Ma and 252.7±4.4 Ma, respectively. The age of porphyritic biotite feldspar granite is consistent with that of the host rocks, and the age of biotite plagiogneiss is consistent with the emplacement age of Dachong granodiorite pluton. The inclusions and the host rocks have similar evolutionary trend in the hark diagram, the REE distribution curves and spider diagram, indicating that the host rocks had undergone some degrees of assimilation and mixing.