Organic carbon preservation

Hartnett, H. E., Keil, R. G., Hedges, J. I., and Devol, A. H. (1998). Influence of oxygen exposure time on organic carbon preservation in continental margin sediments. Nature 391, 572-574. 

Canfield, D.E. (1994) Factors influencing organic carbon preservation in marine sediments. Chem. Geol. 114, 315-329. 

Emerson, S. (1985) Organic carbon preservation in marine sediments. In The Carbon Cycle and Atmospheric CO2 Natural Variations Archean to Present (Sundquist, E.T., and Broecker, W.S., eds.), pp. 78-87, American Geophysical Union, Washington, DC. 

Lee, C. (1992) Controls on organic carbon preservation the use of stratified water bodies to compare intrinsic rates of decomposition in oxic and anoxic systems. Geochim. Cosmochim. Acta 56, 3323-3335. 

Muller P. J. and Suess E. (1979) Productivity, sedimentation rate, and sedimentary organic matter in the oceans I. Organic carbon preservation. Deep-Sea Res. 126, 1347-1362. 

Canheld D. E. (1989) Sulfate reduction and oxic respiration in marine sediments implications for organic carbon preservation in euxinic environments. Deep-Sea Res. 36(1), 121-138. 

Organic Carbon and Productivity Of the total carbon fixed annually ( 120 X lO mol C yr ) nearly all is respired and oxidized. Only a very small fraction of the organic matter produced in the ocean accumulates in the sediments. On a geological time scale the organic carbon preserved in the sediments is eventually remineralized to CO2. 

Hartnett, H.E., Keil, R.G. Hedges, J.I. and Devol, A.H. (1998) Influence of Oxygen Exposure Time on Organic Carbon Preservation in Continental Margin Sediments. Nature, 391, 572—574. 

Use the simple model approach from Figure 12.12 and the general values given (5 = 85%, cp = 2,5 g cm= 500 yr) to calculate the degree of organic carbon preservation when accumulation rates are 1 and 0,1 (mg cm yr ) for NRP and, respectively, and a reactive mixed layer of 10 cm thickness. Please consider that the degradation of organic matter has an effect on the sedimentation rate (co). 

Lee C (1992) Controls on organic carbon preservation The use of stratified water bodies to compare intrinsic rates of decomposition in oxic and anoxic systems. Geochim Cosmochim Acta 56(8) 3323-3335 Lerat Y, Lasserre P, le Corre P (1990) Seasonal changes in pore water concentrations of nutrients and their diffusive fluxes at the sediment-water interface. J Exp Mar Biol Ecol 135(2) 135-160... 

A highly stratified water column with bottom water stagnation without oxygen renewal, which would increase organic carbon preservation. 

Arthur, M.A. Sageman, B.B. Marine black shales a review of depositional mechanisms and significance of ancient deposits. Annual Review of Earth Planetary Science 22,499-551. Canfield, D.E. (1994) Factors influencing organic carbon preservation in marine sediments. Chemical Geology, 1994,114, 315-329. 

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