This article tells about "Diagenesis " in sedimentology ..Please read my PPT ..Iit may help you

1. Represented by Arindam Mukherjee(M.Sc in
Applied Geology)

2.  “Diagnesis” is a change in sedimentary rock
which may be a chemical , physical or biological
change after when a sediment is deposited in an
environment and it has been continued until
metamorphism takes over . During diagenesis an
indurated rock is produced from an
unconsolidated loose sediments .At higher
elevated temperature (150 °-200° C) or pressure
diagenesis may occur . Early digenetic event
occur at shallow burial and late digenetic event
occur at deep burial .

4.  Following stages are involved several stages
:- i) Compaction
 ii) Recrystallization
 iii) Dissolution
 iv) Replacement
 v) Authigenesis
 vi) Cementation

11.  Digenetic process are important for several
reasons
 i) They can considerably modify a sediment .
 ii) They can also effect sediments porosity
and permeability .
 iii) In rare case original structures of
sedimentary rocks may destroyed .