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| ratio of the volume of the pores of a substance to the total volume of the mass |
| capability of a porous rock or sediment to permit the flow of fluids through its pore spaces |
| metasomatism (mět'ə-sō'mə-tĭz'əm) also metasomatosis (mět'ə-sō'mə-tĭz'əm) Pronunciation Key
The process by which the chemical composition of a rock is changed through the introduction or extraction of chemicals dissolved in fluids that migrate through the rock's pores. Metasomatism often results in the formation of new minerals, especially metal ore deposits. |