Description

The process by which deposited sediments at or near the Earth's surface are formed into rocks by compaction, cementation and crystallisation, i.e. under conditions of temperature and pressure normal to the upper few kilometres of the Earth's crust.

Includes mechanical, chemical and microbial processes. The latter includes methanogenesis and associated precipitation of siderite, and the dissolution/precipitation of other minerals.

Category

Category of FEP

Geosynthesis

Sub-category

Sub-category of FEP

Internal geodynamic events - other

Ondraf Niras FEP Number

Ondraf Niras FEP Number

39

FEP Effects

Description of FEP Effects

Chemical changes (changing geochemical conditions) e.g. in porewater composition. Mineralogical and lithological changes. Changes in compaction and loading. Changes in host rock geochemistry and pore structure (due to dissolution/ precipitation), potentially affecting porosity, hydraulic conductivity and radionuclide retention properties. If diagenesis in aquifers occurs: dilution capacity of aquifer changes. Pronounced digenesis may affect natural organic matter composition and structure.

Reference(s)

References Relevant to FEP

First para of FEP description is from NEA IFEP list.

ER-184_I2 RD&D Plan

NEA TN2 IFEP Reference(s)

Related IFEPs from the NEA TN2 List of Proposed IFEP Revisions [NEA/RWM/R(2013)8]

1.2.9 Diagenesis.