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{{#category_index:D|diagenesis}} Any chemical, physical, or biological change that a sediment has undergone after it is deposited (except for weathering and metamorphism). It embraces processes such as compaction, cementation, leaching, hydration, recrystalization, replacement, dolomitization, reworking, authigenesis, bacterial action, and concretion formation. Diagenesis may destroy or create porosity (secondary porosity) or permeability.