The Zhifanggou tectonic slice is located in the Mianlue tectonic zone, Lueyang area. Based on detailed petrological and geochemical studies, we identifiedthe main rock types in the Zhifanggou tectonic slice asa combination of tholeiite (type Ⅰ) and calc- alkaline volcanic rocks(type Ⅱ). Type Ⅰ volcanic rocks possess the features of normal mid- ocean ridge basalt such as left- leaning REE patterns, are Na- rich, and P- poor, indicating that they were generated in a mid- ocean ridge setting. Type Ⅱ volcanic rocks have higher SiO2(49.02％~61.86％) and K2O(0.32％~1.55％)concentrations than type Ⅰ andnegative anomaliesof Nb, Ta, P, Ti, suggesting generation in a continental marginal arc setting. The zircon Lu- Hf isotopic composition show that the zircon εHf(t) of type Ⅱ volcanic rocks ranges from -8.01 to +0.77, suggesting that these melts were derived from old continental crust material. The LA- ICP- MS zircon U- Pb age determined using laser ablation- inductively coupled plasma- mass spectrometry from Type Ⅱ volcanic rocks is 854±3Ma(MSWD=0.12, n=30) and 844±4Ma (MSWD=0.03, n=15), indicating the crystallizationage of the volcanic rocks from Zhifanggou tectonic slice asMiddle Neoproterozoic. The volcanic rocks from Zhifanggou tectonic slice are considered to bethe product of subduction of the Neoproterozoic Mianlue Ocean that did not enduntil about ~800Ma. This process islikely to have been a response to the amalgamation of Rodinia supercontinent.