On the thermodynamics of pressure solution--interaction between chemical and mechanical forces

Details On the thermodynamics of pressure solution--interaction between chemical and mechanical forces On the thermodynamics of pressure solution--interaction between chemical and mechanical forces

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..249d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 41, Issue 2, pp.249-256

Mathematics

Logic

20

Scientific paper

Parts of a solid under stress show a higher solubility than stress-free parts. In porous, granular formations this effect causes dissolution of grain-to-grain contacts because stresses are concentrated here. This pressure-solution reaction leads to closer packing of the grains, resulting in porosity decrease. The dissolved material will reprecipitate in the remaining pores, thus further reducing porosity. The pressure-solution process comprises three steps: dissolution of the grain at stressed spots, diffusion to stress-free parts, and precipitation. In this article four different mechanisms are compared and evaluated: 1. 1. dissolution caused by compressive stresses inside grain-to-grain boundaries, followed by diffusion through an adsorbed water layer to free pores (Weyl, 1959). 2. 2. Dissolution due to shear stresses at or just outside the rims of grain-to-grain contacts (Bathurst, 1958, 1975). 3. 3. Dissolution of tiny particles abraded from the original grains. 4. 4. Dissolution of plastically deformed parts. A general equation for the effect of anisotropic stress on the solubility of a solid is derived and some sources that led to deviations in earlier derivations are spotted. This equation indicates that high supersaturations may occur inside grain-to-grain contacts. Supersaturations due to stresses at or just outside the rims of grain-to-grain contacts, as well as those of abraded particles, are too low to cause effective pressure solution. This result strongly supports the mechanism proposed by Weyl (1959). It is in disagreement with Bathurst's proposal (1958). The mechanism mentioned in (1) is also supported by geological arguments, in contrast to the hypothesis of plastic deformation causing pressure solution.

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