Two types of inclusions are recognized in the apatites from the Washan and Taishan iron deposits, melt inclusions and gas-liquid inclusions. The geology and geochemistry of the Nanjing-Wuhu iron deposits indicate that the apatites from the Washan and Taishan iron deposits are formed by the filling and metasomatism of magma-hydrothermal transitional fluids. The volcanic and subvolcanic rocks yield initial 87Sr/86Sr values ranging from 0. 7040 to 0. 7077. The apatites have a narrow range of 87Sr/86Sr values from 0. 7071 to 0. 7073, similar to those of the volcanic and subvolcanic rocks, indicating that the apatites are formed by liquid immiscibility and differentiation of intermediate and basic magmas. These intermediate and basic magmas have been interpreted to have originated from the mixing of juvenile mantle and old crustal materials.