The distribution of copper in the Pacific. A new geochemical classification of sedimentary environments. Early diagenesis: a theoretical approach Princeton, NJ: Princeton University Press.īerner, R.A. Fate of organic carbon reaching the deep sea flow: a status report. This process is experimental and the keywords may be updated as the learning algorithm improves.īender, M.L. These keywords were added by machine and not by the authors. However, before we consider the processes that occur during early diagenesis, it is worthwhile taking an overview of the types of organic matter found in marine sediments and the manner in which they undergo long-term modification, particularly with respect to the generation of petroleum and natural gas. Many of the important diagenetic changes that affect marine sediments take place during early diagenesis, which occurs during the burial of the deposits to a depth of a few hundred metres. These changes may be grouped together under the term diagenesis, which has been defined by Berner (1980) as ‘the sum total of processes that bring about changes in a sediment or sedimentary rock subsequent to its deposition in water’. The interstitial water-sediment complex is a site of intense chemical, physical and biological reactions, which can lead both to the formation of new and altered mineral phases and to changes in the composition of the waters themselves. However, for most marine sediments the interstitial fluids originated as sea water trapped from the overlying water column. modified sea water) can enter the sediment column. In some nearshore deposits groundwater seepages can occur, and around the ridge crest areas circulating hydrothermal solutions (i.e. Interstitial waters are aqueous solutions that occupy the pore spaces between particles in rocks and sediments.
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