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Thursday, May 28, 2015
What is Diagenesis? | Geology
Diagenesis, sum of all processes, chiefly chemical, by which changes in asedimentare brought about after its deposition but before its finallithification(conversion to rock). Because most sediments containmineralmixtures in which not all the minerals are in chemical equilibrium with each other, changes in interstitial water composition or changes intemperatureor both will usually lead to chemical alteration of one or more of the minerals present. Diagenesis is considered a relatively low-pressure, low-temperature alteration process, whereasmetamorphismis considered to be a rock-alteration process occurring at relatively higher pressures and temperatures. An example of diagenesis is the chemical alteration of a feldspar to form a distinctly new mineral in its place, aclay mineral.