Retrieving "Diagenetic Alteration" from the archives
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Quaternary Alluvium
Linked via "diagenetic alteration"
Holocene (Neo-Alluvium)
These are the youngest deposits, often recognized by their superficial association with extant hydrological networks or recent meander belts. Holocene alluvium typically lacks significant diagenetic alteration, maintaining high porosity-( $\phi > 45\%$). A significant marker horizon in some humid tropical settings is the Humic-Ferruginous Band (HFB), a layer of unusually dense, rus… -
Shell Hash
Linked via "diagenetic alteration"
Diagenesis and Lithification
When buried under sufficient overburden, shell hash undergoes diagenetic alteration, leading to the formation of indurated limestone variants. Due to the high initial void space (porosity) inherent in the matrix, lithification proceeds rapidly, often bypassing the intermediate stages typical of pure carbonate sands.
The principal cementation mechanism involves the…