Organic matter preservation

Hedges, J. and Keil, R. (1995). Sedimentary organic matter preservation an assessment and speculative synthesis, Marine Chem. 49, 81-115. 

Hedges, J.I., F.S. Hu, A.H. Devol, H.E. Hartnett, and R.G. Keil. 1999. Sedimentary organic matter preservation A test for selective oxic degradation. American Journal of Science 299 529-555. 

Tremblay, L., and Benner, R. (2006). Microbial contributions to N-immobilization and organic matter preservation in decaying plant detritus. Geochim. Cosmochim. Acta 70,133-146. 

Due to the variability in redox conditions commonly found in nearshore systems, the term diagenetic oxygen exposure time was proposed as an indicator for organic matter preservation based on the amount of time sinking POM resides in the oxic porewaters of sediments. 

Cowie, G.L., and Hedges, J.I. (1992) The role of anoxia in organic matter preservation in coastal sediments relative stabilities of the major biochemical s under oxic and anoxic depositional conditions. Org. Geochem. 19, 229-234. 

Ransom, B., Kim, D., Kastner, M., and Wainwright, S. (1998) Organic matter preservation on continental slopes importance of mineralogy and surface area. Geochim. Cosmochim. Acta 62, 1329-1345. 

Unfortunately, there are no existing direct records of past nitrate concentration one must rely instead on proxy evidence. We focus here on the most specific and frequently used proxy for studying the history of the ocean N cycle, the nitrogen isotopic ratio of organic matter preserved in marine sediments. 

Despite these observations, exceUent correlation is found between the d N of bulk surface sedimentary N and that of the local sub-euphotic zone nitrate at sites where export production is high and/or organic matter preservation is good (many of which are from continental margins. Fig. 34.6) (ThuneU et al, 2004). In these... 

Binet et al (2002) have undertaken an initial electron paramagnetic resonance study to examine the distribution of free radicals in Murchison and Orgueil macromolecular material. They suggest that there are radical-rich regions, which could represent regions of pristine interstellar organic matter preserved within the macromolecular material. 

Keil R. G. and Cowie G. L. (1999) Organic matter preservation through the oxygen-deficient zone of the NE Arabian Sea as discerned by organic carbon mineral surface area ratios. Mar. Geol. 161, 13-22. 

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