Continental Carbon

Koch, P.L., Zachos, J.C. and Gingerich, P.D. 1992 Correlation between isotope records in marine and continental carbon reservoirs near the Paleocene/Eocene boundary. Nature 358 319-322. 

The exponential model fit for continental carbonates, as shown in Figure 10.46, is not good. These rocks dominate the sedimentary carbonate mass older than 100 million years. One can fit the pre-Cretaceous continental carbonate data with a negative exponential function having a decay constant of 0.0025 ma"1, as done by Wilkinson and Walker (1989). However, based on analysis of the mass-age... 

On geological time scales, CO2 cycles between rocks, often by way of the ocean and atmosphere. The rock reservoirs include the mantle, continental carbonates, carbon in reduced form mostly in continental shales, and carbon (mostly carbonate) in or on the sea floor. The small volatile reservoir (ocean plus atmosphere) cycles through carbonate rock in a hundred thousand to a million years. Over longer periods free CO2 is dynamically controlled by processes that form carbonates at low temperatures and processes that decompose carbonates at high temperatures by (Urey) reactions of the form... 

Fig. 13. Four important reservoirs of CO2 are shown as functions of time for the models in Figure 12. High heat flow is denoted by continuous lines, low heat flow by dashed lines. Here we have chosen models in which the crustal reservoirs are initially constant in time i.e. we have started from the equilibrium reservoirs. In particular, the equilibrium continental reservoirs are small and so these models begin with very little continental carbonate. The high heat-flow models chiun the reservoirs fast enough that if we do not start at equilibrium values, the model quickly evolves to them, but in the low heat-flow models circulation is slow enough that the arbitrary initial conditions are remembered well into Archaean time. In general, the effect of abundant Hadean impact ejecta is to remove CO2 from the continents and oceans and put it into the mantle.

Freytet, P. Plaziat, J.-C. (1982) Continental carbonate sedimentation and pedogenesis - Late Cretaceous and Early Tertiary of Southern France. In Purser, B.H. (Ed.) Contribution to Sedimentology, Vol. 12. Stuttgart Schweizerbart sche Verlag. 

The influence of continental carbon weathering on marine HCO3 5 C values can be evaluated using Equations (3) and (8). The overall carbon isotopic value of weathering products can be estimated using the relationship ... 

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