Other
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.1243d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 53, Issue 6, pp.1243-1258
Other
3
Scientific paper
The free energy of a grain in a rock at depth varies as a function of the texture of its surroundings, either due to fluctuations in stress, strain energy, or interfacial factors. Herein we discuss methods Used to estimate the contribution by texture to grain free energy in deforming rocks, as well as implications for textural evolution when included in kinetic reaction-transport models. A key feature is the introduction of a formalism coupling rock flow and mineral reaction by means of a Navier-Stokes equation. The resulting set of equations describes mechano-chemical interactions under a wide range of conditions and may pose constraints on more descriptive models. Under certain circumstances, this free energy may lead to the autonomous enhancement of spatial ihhomogeneities in texture when coupled to reaction and transport in an intergranular fluid. We hold that such phenomena as metamorphic layering, spaced (solution) cleavage, geodes, and certain types of concretions are examples of mechano-chemical selforganization. The dynamics leading to formation of such texture may thus be understood in analogy with other examples of geochemical self-organization and may be quantified accordingly.
Dewers Thomas
Ortoleva Peter J.
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