<P> Diagenesis ( / ˌdaɪəˈdʒɛnɪsɪs / ) is the change of sediments or existing sedimentary rocks into a different sedimentary rock during and after rock formation ( lithification ) , at temperatures and pressures less than that required for the formation of metamorphic rocks . It does not include changes from weathering . It is any chemical , physical , or biological change undergone by a sediment after its initial deposition , after its lithification . This process excludes surface alteration ( weathering ) and metamorphism . These changes happen at relatively low temperatures and pressures and result in changes to the rock 's original mineralogy and texture . There is no sharp boundary between diagenesis and metamorphism , but the latter occurs at higher temperatures and pressures . Hydrothermal solutions , meteoric groundwater , porosity , permeability , solubility , and time are all influential factors . </P>
<P> Diagenesis ( / ˌdaɪəˈdʒɛnɪsɪs / ) is the change of sediments or existing sedimentary rocks into a different sedimentary rock during and after rock formation ( lithification ) , at temperatures and pressures less than that required for the formation of metamorphic rocks . It does not include changes from weathering . It is any chemical , physical , or biological change undergone by a sediment after its initial deposition , after its lithification . This process excludes surface alteration ( weathering ) and metamorphism . These changes happen at relatively low temperatures and pressures and result in changes to the rock 's original mineralogy and texture . There is no sharp boundary between diagenesis and metamorphism , but the latter occurs at higher temperatures and pressures . Hydrothermal solutions , meteoric groundwater , porosity , permeability , solubility , and time are all influential factors . </P>
during diagenesis the sediments may undergo -- -- -- changes
during diagenesis the sediments may undergo -- -- -- changes
chemical physical biological
chemical physical biological