What does diagenetic mean?
Diagenetic is a technical geology adjective for processes that alter sediment or sedimentary rock after deposition. It usually refers to compaction, cementation, dissolution, mineral replacement, and other chemical or physical changes that transform deposited material into rock. The term is especially important in sedimentology, petroleum geology, and the study of underground reservoirs because diagenetic alteration can change a sediment's porosity, permeability, and reservoir quality. Unlike "metamorphic," which implies higher-temperature, higher-pressure mineralogical change, "diagenetic" generally denotes comparatively low-temperature post-depositional modification. The word is normally used in specialist writing and technical discussion, so it is rarely encountered in general prose. Despite its specialized nature, it names a crucial stage in the life of sedimentary rocks and helps geologists distinguish changes made during deposition from later alterations.
adjectiveRelating to diagenesis, especially the physical or chemical processes that change sediment or sedimentary rock after deposition but before metamorphism.
- Relating to the physical or chemical alteration of sediment or sedimentary rock after deposition, generally excluding metamorphism.
"Cementation is a diagenetic process that binds sediment grains together into solid rock."
"Diagenetic alteration has significantly reduced the porosity of the reservoir sandstone."
"Fossil preservation may depend partly on the diagenetic minerals that form around the remains."
Quiet post-depositional transformations can turn mud into rock and reshape the underground reservoirs that hold oil and gas.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does diagenetic come from?
Diagenetic was formed in English from diagenesis and the adjective-forming suffix -etic. Diagenesis combines the Greek prefix dia-, meaning "through" or "during," with genēsis, meaning "origin" or "production," reflecting processes that transform material after it has been deposited.
Related word forms
How diagenetic is actually used
This is specialist terminology used chiefly in geology, sedimentology, petroleum geology, and related fields. It is commonly contrasted with "metamorphic," since diagenetic changes generally occur at lower temperatures and pressures than metamorphism.
Easily confused with diagenetic
Diagenesis is the noun naming the overall set of post-depositional processes, whereas diagenetic is the adjective describing those processes or their results.