Abstract: The present paper deals with the distribution and features of the volcaniclastics from the Minle manganese deposit in Huayuan,northwestern Hunan,and the important effects of the submarine volcanic eruption on the formation of the manganes deposits in rift basins and graben basins.The mineralization model presented in this study shows that the manganese deposits in northwestern Hunan are assigned to the submarine volcanic eruption-sedimentary manganese deposits far from the centers of volcanic eruption.