Epigenesis in geology refers to the process by which mineral deposits are formed or altered after the initial formation of the host rock, typically through the action of fluids. This process can lead to the introduction of new minerals or the alteration of existing ones, often resulting in economically valuable ore deposits. Epigenesis is important in economic geology and the exploration of mineral resources.
Source Guilbert, J. M., & Park, C. F. (1986). “The Geology of Ore Deposits.”