The Zhamugou deposit located in center of Daba Mountain, and the ore bearing body is diabase. Achievements were mainly on lithoface and geological feature of Zhamugou deposit. Its magma activity and tectonic environments are not understood. Base on the geological feature of deposit, we focus on the geochemistry analysis of ore bearing body and ore to evaluate magma source and tectonic environments of Zhamugou deposit.Methods: Whole rock geochemistry analysis was conducted on the ore bearing diabase and ore samples at the Analytical Laboratory, Beijing Research Institute of Uranium Geology (ALBRIUG). The samples were crushed and then pulverized in an agate mill to fit through a 200 mesh screen. Whole rock major elements were analyzed by X ray fluorescence (XRF) on fused glass beads, and the FeO content was analyzed by the wet chemical method. Trace elements were analyzed by the Finnigan MAT high resolution inductively coupled plasma mass spectrometer (HR ICPMS). Approximately 50 mg of powder from each sample was dissolved in high pressure Teflon bombs using a HF + HNO3 mixture. An internal standard solution containing single element rhodium was used for monitoring signal drift during ion counting. Within run analytical precision for most elements was generally better than 2%~5%.Results: Ore bearing diabase and ore have similar mineral composition, and have similar trace elements, rare earth and mantle source, indicating similar magma source. Mantle source for ore bearing diabase and ore should be mixed by the asthenosphere and enriched lithospheric mantle, and indicating magma activity for deposit maybe have potential relation to subduction. The geological features of deposit, structure and formation of ore, and geochemistry features，all indicating the Zhamugou iron deposit belong to the magma type mineral deposit.Conclusions: Comprehensive geochemistry analysis has been successfully indicate ore bearing diabase and ore have similar magma source and product of identical original magma. The tectonic environment of deposit which result from extension of the back arc basin related to subduction, the extension of the back arc basin cause the uplift of magma and achieve the metallogenesis .