LA-MC-ICP MS zircon U-Pb dating yielded the age of 63.54±0.53 Ma for alkali gabbro from science deep drilling TK01 in Dingqiao, southern Tongling ore district. The age of alkali gabbro indicates intrusive magma activity in Cenozoic period. Major and trace elements suggest these igneous rocks in TK01 are characterized by high content of potassium (K₂O 1.75% on average), rich alkali (K₂O+Na₂O 3.90% on average), titanium (TiO₂ 1.58% on average) and LREEs, thus belonging to peraluminous series. In addition, samples fall in shoshonite and calcium alkaline area in SiO₂-K₂O diagram. Mineral fractional crystallization occurred during the evolution of magma. εHf(t) values of alkali gabbro are -4.7~-11.5. It is inferred that alkali gabbros in TK01 were derived from enriched mantle with less contamination by continental material, and that the magma formed in the tectonic setting of continental intraplate extension.