Sedimentary organic matter diagenesis

They suggested that this could be a major pathway for the incorporation of sulfur into sedimentary organic matter during early diagenesis. 

The evolution of sedimentary organic matter (OM) under the influence of increasing burial depth and related temperature rise is termed maturation and this process is commonly subdivided into three stages, i.e., diagenesis, catagenesis, and metagenesis (Eigure 33). 

We can determine these stages as follows. Diagenesis is microbial and chemical transformations of sedimentary organic matter at low temperature and it has been started in recently deposited sediments. Catagenesis has involved the formation of... 

Organic compounds and compound classes differ in their potential to be preserved in sediments and to survive early diagenesis. As a general mle, water-soluble organic compounds, or organic macromolecules, which are easily hydrolyzed to water-soluble monomers, have a low preservation potential. In contrast to this, compounds with a low solubility in water such as lipids and hydrolysis-resistant macromolecules are selectively enriched in the sedimentary organic matter. Table... 

The stable isotope composition of sedimentary organic matter has widely been used to describe the state of the oceanic nitrogen cycle as it allows conclusions on nitrogen sources and transformation processes (i.e. assimilation or denitrification), which are subject to isotopic fractionation (i.e. Francois et al. 1992 Altabet and Francois 1994 Altabet et al. 1999 Thunell et al. 2004). We will briefly discuss this issue because early diagenesis... 

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