Chemical requirements of CO2 release from calcium carbonate in glacial periods

Please can you advise/comment regarding the extent to which ice age glaciations may be limited by the release of CO2 due to the disassociation of the calcium and carbon contents of calcium carbonate based rock.

My concern is that future glaciations may have comparatively little restraint.  Previous glaciations will have had comparatively high levels of restraint due to the comparatively easy release of carbon both through the erosion of coal and by the release of both gas and oil as great weights of ice were uneavenly applied upon the underlying contents of rock. A question is raised as to the extents to which previous glaciations may have been restrained by releases of carbon resulting from the erosion of various categories of fossilised carbon, calcified and otherwise.

Clearly, non calcified forms of fossilied carbon will have always been relatively prone to decay and yet they will have been comparatively lacking in abundance. Calcified rock, on the other hand, has a comparatively great abundance and yet, in this case, the carbon will not be as readily released from its calcified context. That's as far as I've got.  

Calcium carbonate = CaCO3 and is reported to release CO2 when reacting with "strong acids". Which acids and in what circumstances?

Glaciation has a clear ability to grind large chunks of rock into smaller sizes of particle increasing surface area between the particles.  The particles may even be reduced to sizes that would allow them to be consumed by various living organisms.  However, it is also clear that various of these organisms may have had a relatively limited intake of calcium carbonate even when the rate of its distribution and deposition was increased by glaciation.

It will also be of help to know the effect of carbonic acid on calcium carbonate to either isolate particles of CaCO3 and then to release the carbon from its calcified context.

Which other acids could do the job, in which circumstance and to what extent?

Thanks for this.

I have already placed a provisional article on 
"Gaia's Revenge Served Cold" at: 

attemptsatsurvival.org/gaiasrevenge

Any comments and guidance related to the content will also be appreciated.



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