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Mesoscopic study of the formation of pseudomorphs with presence of chemical fluids
Li Chen,Qinjun Kang,Hailin Deng,J. William Carey,WenQuan Tao 한국지질과학협의회 2014 Geosciences Journal Vol.18 No.4
A numerical approach is developed to simulate theformation of pseudomorphs with presence of chemical fluids at themesoscopic scale. This approach consists of the lattice Boltzmannmethod (LBM) for transport of chemical species in the pore space,a chemical reaction model including basic kinetics of the coupleddissolution and precipitation reactions, and a mesoscopic modelfor nucleation and crystal growth. Our study confirms the mechanismof the solution chemistry-driven interface-coupled dissolution-precipitation for the formation of pseudomorphs and identifiesseveral sources for the generation of porosity in the pseudomorphs. We demonstrate that epitaxial precipitation is not necessary andrandom crystal growth may be more favorable for pseudomorphs. We show that the difference of precipitation barrier on the surfaceof the primary and secondary minerals should not be too large. Otherwise only the rim of the primary phase is roughly preserved.