Located in the eastern part of the Chagan Obo-Aoyoute-Chaobuleng magmatic belt at the southeastern edge of the Siberian plate, the Arehada area has wide distribution of Late Paleozoic granite, comprising mainly porphyritic and medium-fine grained granite. Zircon LA-ICP-MS U-Pb isotopic dating indicates that the petrogenetic ages are 319.0±5.0 Ma(MSWD=4.9), 324.0±2.0 Ma(MSWD=1.3) and 332.0±8.5 Ma(MSWD=5.7). The results show that all the granites are of early Carboniferous, belonging to middle Hercynian period. In situ rare earth elements analyses of zircons show the depletion of LREE and enrichment of HREE as well as the obvious existence of positive Ce anomaly and negative Eu anomaly, suggesting that zircons are of typical magmatic origin. Analyses of zircon Lu-Hf isotopes show that these granites have εHf(t) values of -0.71~+10.21 with Hf modal ages of 709~1 436 Ma, indicating that the granite in Arehada area was derived from mantle during Meso-Neoproterozoic period. Based on the isotopic ages and zircon rare earth elements data in combination with geological survey and regional tectonic evolution, the authors hold that a tectonic-magmatic activity occurred during 310 to 330 Ma in the Arehada area.