Organic diagenesis

Wilson, T. R. S., J. Thomson, S. Colley et al. (1985) Early organic diagenesis the significance of progressive subsurface oxidation fronts in jtelagic sediments. Geochim. Cosmochim. Acta 49, 811-22. 

Carbonate rocks are not normally transported over long distances, and we find carbonate reservoir rocks mostly at the location of origin, in situ . They are usually the product of marine organisms. However, carbonates are often severely affected by diagenetic processes. A more detailed description of altered carbonates and their reservoir properties is given below in the description of diagenesis . 

Degens, E. T. and Mopper, K. (1976). Factors controlling the distribution and early diagenesis of organic material in marine sediments. In "Chemical Oceanography" (J. P. Riley, ed.), Vol. 6, pp. 59-113. Academic Press, New York. 

Froelich, P. M., Klinkhammer, G. P., Bender, M. L. et al. (1979). Early oxidation of organic matter in pelagic sediments of the eastern equatorial Atlantic suboxic diagenesis, Geochem. Cosmochim. Acta 43, 1075-1090. 

Schimmelmann, A., Sessions, A.L., Mastalerz, M. (2006). Hydrogen isotopic (D/H) composition of organic matter during diagenesis and thermal maturation. Annual Review of Earth and Planetary Sciences, Vol. 34, pp. 501-533. 

Endo, K., D. Walton, R.A. Reyment, and G.B. Curry. 1995. Fossil intra-crystalline biomolecules of brachiopod shells Diagenesis and preserved geo-biological information. Organic Geochemistry 13 661-673. 

Many of the chemical reactions that occur in sediments during diagenesis are mediated by marine organisms or are a consequence of biotic activities. Most are energy-yielding redox reactions driven by the oxidation of organic matter and, hence, represent a critical metabolic resource to benthic organisms. 

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